Makefile.rules

########################################################################
#
# Makefile rules for GAP, to be included from GNUmakefile.
# Partially based on the git and ScummVM build systems.
#
# This requires GNU make!!! You have been warned.
#
# To learn more about the GAP build system, see README.buildsys.md
#
########################################################################


########################################################################
# Default rule: build gap
########################################################################
all: gap$(EXEEXT) gac
.PHONY: all

libgap: libgap.la
.PHONY: libgap

# Backwards compatibility: add "default" target as alias for "all"
default: all
.PHONY: default


########################################################################
# Source files
#
# We avoid line continuations, instead use repeatedly "SOURCES+=". This
# makes it trivial to comment out lines, or to insert conditionals.
########################################################################
SOURCES =
SOURCES += src/ariths.c
SOURCES += src/blister.c
SOURCES += src/bool.c
SOURCES += src/c_methsel1.c
SOURCES += src/c_oper1.c
SOURCES += src/c_type1.c
SOURCES += src/calls.c
SOURCES += src/code.c
SOURCES += src/compiler.c
SOURCES += src/compstat.c
SOURCES += src/costab.c
SOURCES += src/cyclotom.c
SOURCES += src/debug.c
SOURCES += src/dt.c
SOURCES += src/dteval.c
SOURCES += src/exprs.c
SOURCES += src/ffdata.c
SOURCES += src/finfield.c
SOURCES += src/funcs.c
SOURCES += src/gap.c
SOURCES += gen/gap_version.c	# generated source file
SOURCES += src/gapstate.c
SOURCES += src/gvars.c
SOURCES += src/hookintrprtr.c
SOURCES += src/integer.c
SOURCES += src/intfuncs.c
SOURCES += src/intrprtr.c
SOURCES += src/io.c
SOURCES += src/iostream.c
SOURCES += src/listfunc.c
SOURCES += src/listoper.c
SOURCES += src/lists.c
SOURCES += src/macfloat.c
SOURCES += src/modules-builtin.c
SOURCES += src/objccoll.c
SOURCES += src/objcftl.c
SOURCES += src/objects.c
SOURCES += src/objfgelm.c
SOURCES += src/objpcgel.c
SOURCES += src/objscoll.c
SOURCES += src/objset.c
SOURCES += src/opers.c
SOURCES += src/permutat.c
SOURCES += src/plist.c
SOURCES += src/pperm.c
SOURCES += src/precord.c
SOURCES += src/profile.c
SOURCES += src/range.c
SOURCES += src/rational.c
SOURCES += src/read.c
SOURCES += src/records.c
SOURCES += src/saveload.c
SOURCES += src/scanner.c
SOURCES += src/sctable.c
SOURCES += src/set.c
SOURCES += src/stats.c
SOURCES += src/streams.c
SOURCES += src/stringobj.c
SOURCES += src/sysfiles.c
SOURCES += src/system.c
SOURCES += src/tietze.c
SOURCES += src/trans.c
SOURCES += src/vars.c
SOURCES += src/vec8bit.c
SOURCES += src/vecffe.c
SOURCES += src/vecgf2.c
SOURCES += src/vector.c
SOURCES += src/weakptr.c

# TODO: Change the following to check for a new USE_BOEHM flag
ifeq ($(HPCGAP),yes)
  SOURCES += src/boehm_gc.c
else
  SOURCES += src/gasman.c
endif

ifeq ($(GAPMPI),yes)
  SOURCES += src/hpc/gapmpi.c
endif

ifeq ($(HPCGAP),yes)
  SOURCES += src/hpc/aobjects.c
  SOURCES += src/hpc/misc.c
  SOURCES += src/hpc/serialize.c
  SOURCES += src/hpc/thread.c
  SOURCES += src/hpc/threadapi.c
  SOURCES += src/hpc/tls.c
  SOURCES += src/hpc/traverse.c
endif


########################################################################
# Preprocessor flags
#
# GAP_CPPFLAGS is for the GAP build system, while GAP_PKG_CPPFLAGS is
# for use by gac, and for package build systems. The latter does not
# contain warning flags, and uses absolute include paths.
########################################################################

GAP_CPPFLAGS =
GAP_PKG_CPPFLAGS =

# First add include paths

# If this is an out-of-tree build, then first add the builddir to the list of
# include directories, so that the correct gen/config.h is picked up (even if
# the user also has an active in-tree build)
ifneq ($(builddir),$(srcdir))
  GAP_CPPFLAGS += -I$(builddir)
  GAP_PKG_CPPFLAGS += -I$(abs_builddir)
endif

# Finally look into srcdir
GAP_CPPFLAGS += -I$(srcdir)
GAP_PKG_CPPFLAGS += -I$(abs_srcdir)

# Add DEFS (from autoconf, contains -D flags)
GAP_CPPFLAGS += $(DEFS)
GAP_PKG_CPPFLAGS += $(DEFS)

# Add flags for dependencies
GAP_CPPFLAGS += $(GMP_CPPFLAGS)
GAP_CPPFLAGS += $(READLINE_CPPFLAGS)
GAP_CPPFLAGS += $(BOEHM_GC_CPPFLAGS)
GAP_CPPFLAGS += $(LIBATOMIC_OPS_CPPFLAGS)

GAP_PKG_CPPFLAGS += $(GMP_CPPFLAGS)
GAP_PKG_CPPFLAGS += $(READLINE_CPPFLAGS)
GAP_PKG_CPPFLAGS += $(BOEHM_GC_CPPFLAGS)
GAP_PKG_CPPFLAGS += $(LIBATOMIC_OPS_CPPFLAGS)

# Add flags controlling compiler warnings (not for GAP_PKG_CPPFLAGS)
GAP_CPPFLAGS += $(WARNING_CPPFLAGS)

# Finally add user provided flags
GAP_CPPFLAGS += $(CPPFLAGS)
GAP_PKG_CPPFLAGS += $(CPPFLAGS)


########################################################################
# Compiler flags
########################################################################
GAP_CFLAGS = $(ABI_CFLAGS)

ifeq ($(HPCGAP),yes)
GAP_CFLAGS += $(PTHREAD_CFLAGS)
endif

# Finally add user provided CFLAGS
GAP_CFLAGS += $(CFLAGS)


########################################################################
# Linker flags
########################################################################
GAP_LDFLAGS = $(ABI_CFLAGS)

# Add flags for dependencies
GAP_LDFLAGS += $(GMP_LDFLAGS)
GAP_LDFLAGS += $(READLINE_LDFLAGS)
GAP_LDFLAGS += $(BOEHM_GC_LDFLAGS)
GAP_LDFLAGS += $(LIBATOMIC_OPS_LDFLAGS)

ifeq ($(HPCGAP),yes)
GAP_LDFLAGS += $(PTHREAD_CFLAGS) $(PTHREAD_LIBS)
endif

# Finally add user provided flags
GAP_LDFLAGS += $(LDFLAGS)


# libs
GAP_LIBS =

# Add flags for dependencies
GAP_LIBS += $(GMP_LIBS)
GAP_LIBS += $(READLINE_LIBS)
GAP_LIBS += $(BOEHM_GC_LIBS)
GAP_LIBS += $(LIBATOMIC_OPS_LIBS)

# Finally add user provided flags
GAP_LIBS += $(LIBS)


########################################################################
# HPC-GAP: transform code using ward
#
# For HPC-GAP, we must use ward as a preprocessor before invoking the C
# compiler. Moreover, some source files come in two versions: One which is
# located in src/, and another in hpcgap/src/, which is to be used instead
# when building in HPC-GAP mode.
#
# The following build rules achieve this.
########################################################################
ifeq ($(HPCGAP),yes)

# Compute new list of sources from ORIGINAL_SOURCES, by replacing src/ with gen/
ORIGINAL_SOURCES := $(SOURCES)
SOURCES := $(patsubst src/%,gen/%,$(ORIGINAL_SOURCES))

# Determine which sources have a version in "hpcgap/src".
# This uses the fact that "wildcard" only returns paths which refer
# to existing files.
HPCGAP_SOURCES := $(wildcard $(addprefix $(srcdir)/hpcgap/,$(ORIGINAL_SOURCES)))
HPCGAP_SOURCES := $(subst $(srcdir)/hpcgap/src/,,$(HPCGAP_SOURCES))
HPCGAP_SOURCES := $(addprefix gen/,$(HPCGAP_SOURCES))

# static pattern rule for sources with an HPCGAP-version
# (note that ward needs to parse the sources, hence gen/config.h must already be made)
$(HPCGAP_SOURCES): gen/%.c: hpcgap/src/%.c gen/config.h
	@$(MKDIR_P) $(@D)/$(DEPDIRNAME)
	@echo "$@: $<" > $(DEPFILE)
	@echo "$<:" >> $(DEPFILE)
	$(QUIET_WARD) CPP="$(CPP)" $(ADDGUARDS2) -cpp $(GAP_CPPFLAGS) -- $< > $@

# static pattern rule for sources without an HPCGAP-version
# (note that ward needs to parse the sources, hence gen/config.h must already be made)
gen/%.c: src/%.c gen/config.h
	@$(MKDIR_P) $(@D)/$(DEPDIRNAME)
	@echo "$@: $<" > $(DEPFILE)
	@echo "$<:" >> $(DEPFILE)
	$(QUIET_WARD) CPP="$(CPP)" $(ADDGUARDS2) -cpp $(GAP_CPPFLAGS) -- $< > $@

# Normally, GNU make deletes intermediate build files, such as the gen/*.c
# files generated by ward. We do not want this for various reasons (performance
# being one of them), so we tell GNU make accordingly:
.SECONDARY: $(SOURCES)

endif # end of HPCGAP specific code


# instruct GNU make to delete output files of failed build rules,
# so that if Ward errors out, any incomplete generated files are
# deleted.
.DELETE_ON_ERROR:


########################################################################
# Object files
########################################################################

# OBJS shall contain the names of all object files that constitute GAP.
# So turn all src/*.c and gen/*.c file names in SOURCES into obj/*.lo
OBJS = $(patsubst gen/%.c,obj/%.lo,$(patsubst src/%.c,obj/%.lo,$(SOURCES)))

# ensure config.h is built before the compilers gets invoked
$(OBJS): gen/config.h


########################################################################
# Quiet rules.
#
# Replace regular output with quiet messages, unless V is set,
# e.g. "make V=1"
########################################################################
ifneq ($(findstring $(MAKEFLAGS),s),s)
ifndef V
QUIET_CC      = @echo "   C       $< => $@";
QUIET_LINK    = @echo "   LINK    $@";
QUIET_WARD    = @echo "   WARD    $< => $@";
QUIET_SED     = @echo "   SED     $< => $@";
QUIET_INSTALL = @echo "   INSTALL $< => $@";
QUIET         = @
LIBTOOL 	 += --silent
endif
endif


########################################################################
# Rules for automatic header dependency tracking.
#
# This is somewhat similar to what automake does, but relies on compiler
# support. The result is much simpler.
#
# So, here is what happens: In each directory containing source files,
# a ".deps" subdirectory is created. We then instruct the compiler via
# some flags to create a ".deps/FOO.d" file when it compiles "FOO.c".
# This file encodes the header dependencies of "FOO.c" in a way that
# make can read (i.e. simply as a bunch of make targets with
# dependencies).
#
# Finally, to let make track the header dependencies, we include the *.d files.
#
# For a more detailed explanation of a very similar scheme, read this:
# http://make.mad-scientist.net/papers/advanced-auto-dependency-generation/
#
########################################################################

# Name of subdirectories in which the generated dependencies are stored.
DEPDIRNAME := .deps

# List of all (potential) dependency directories, derived from OBJS
# and SOURCES (the latter for generated sources, which may also involve
# dependency tracking)
DEPDIRS = $(addsuffix $(DEPDIRNAME),$(sort $(dir $(SOURCES) $(OBJS))))

# Include the dependency tracking files.
-include $(wildcard $(addsuffix /*.d,$(DEPDIRS)))

# Mark *.d files as PHONY. This stops make from trying to
# recreate them (which it can't), and in particular from looking for potential
# source files. This can save quite a bit of disk access time.
.PHONY: $(wildcard $(addsuffix /*.d,$(DEPDIRS)))

DEPFILE = "$(@D)/$(DEPDIRNAME)/$(*F).d"

# The following flags instruct the compiler to enable advanced
# dependency tracking. Supported by GCC 3 and newer; clang; Intel C
# compiler; and more.
#
# TODO: use configure to compute DEPFLAGS, so that we can
# disable it for compilers that don't support it, resp. replace it
# something that works for that compiler
DEPFLAGS = -MQ "$@" -MMD -MP -MF $(DEPFILE)


########################################################################
# Compiler rules
########################################################################

COMPILE=$(LIBTOOL) --mode=compile $(CC)

# Build rule for C source files
# Disabled for HPC-GAP, to ensure we always use the output of ward
# and not the original source files
ifeq ($(HPCGAP),no)
obj/%.lo: src/%.c cnf/GAP-CFLAGS cnf/GAP-CPPFLAGS
	@$(MKDIR_P) $(@D)/$(DEPDIRNAME)
	$(QUIET_CC)$(COMPILE) $(DEPFLAGS) $(GAP_CFLAGS) $(GAP_CPPFLAGS) -c $< -o $@
endif

# Build rule for generated C source files
obj/%.lo: gen/%.c cnf/GAP-CFLAGS cnf/GAP-CPPFLAGS
	@$(MKDIR_P) $(@D)/$(DEPDIRNAME)
	$(QUIET_CC)$(COMPILE) $(DEPFLAGS) $(GAP_CFLAGS) $(GAP_CPPFLAGS) -c $< -o $@


########################################################################
# Linker rules for gap executable
########################################################################

LINK=$(LIBTOOL) --mode=link $(CC) -export-dynamic

libgap.la: $(OBJS) cnf/GAP-LDFLAGS cnf/GAP-LIBS cnf/GAP-OBJS
	$(QUIET_LINK)$(LINK) -no-undefined -rpath $(libdir) $(GAP_LDFLAGS) $(OBJS) $(GAP_LIBS) -o $@

ifeq ($(SYS_IS_CYGWIN32),yes)

all: bin/gapicon.bmp bin/gapicon.ico bin/instcygwinterminfo.sh bin/cygwin-version.txt
bin/gapicon.bmp: $(srcdir)/cnf/cygwin/gapicon.bmp
	cp $< $@
bin/gapicon.ico: $(srcdir)/cnf/cygwin/gapicon.ico
	cp $< $@
bin/instcygwinterminfo.sh: $(srcdir)/cnf/cygwin/instcygwinterminfo.sh
	cp $< $@
	chmod a+x $@
bin/cygwin-version.txt:
	uname -a > $@

GAP_CPPFLAGS += "-DCOMPILECYGWINDLL"

# increase stack size, the default is too small (see issue #1522)
GAP_LDFLAGS += -Wl,--stack,16777216

# Special build rules for CYGWIN / Windows: In order to allow kernel
# extensions, we employ a trick: GAP itself is compiled into DLL, in which 
# GAP's standard main function is renamed. And gap.exe is a tiny binary which
# loads that DLL and calls the renamed main function.
all: bin/$(GAPARCH)/gap.dll
bin/$(GAPARCH)/gap.dll: symlinks libgap.la
	cp .libs/cyggap-0.dll $@  # FIXME: HACK to support kernel extensions
gap$(EXEEXT): libgap.la cnf/GAP-LDFLAGS cnf/GAP-LIBS cnf/GAP-OBJS
	$(QUIET_LINK)$(LINK) $(GAP_LDFLAGS) $(srcdir)/src/gapw95.c $(GAP_LIBS) libgap.la -o $@
	@( if which peflags > /dev/null ; then peflags --cygwin-heap=2048 gap$(EXEEXT) ; fi )

else

# Linking rule and dependencies for the main gap executable
gap$(EXEEXT): $(OBJS) cnf/GAP-LDFLAGS cnf/GAP-LIBS cnf/GAP-OBJS
	$(QUIET_LINK)$(LINK) $(GAP_LDFLAGS) $(OBJS) $(GAP_LIBS) -o $@

endif


########################################################################
# The "docomp" target regenerates the various src/c_*.c files, and
# replaces the old "etc/docomp" script.
########################################################################
ifeq ($(HPCGAP),yes)
DOCOMP_PREFIX = $(abs_srcdir)/hpcgap
else
DOCOMP_PREFIX = $(abs_srcdir)
endif
docomp: #gap$(EXEEXT)
	@"$(abs_srcdir)"/cnf/GAP-C-GEN $(abs_srcdir)/lib $(abs_srcdir)/src methsel1 ./gap$(EXEEXT)
	@"$(abs_srcdir)"/cnf/GAP-C-GEN $(abs_srcdir)/lib $(DOCOMP_PREFIX)/src oper1 ./gap$(EXEEXT)
	@"$(abs_srcdir)"/cnf/GAP-C-GEN $(abs_srcdir)/lib $(DOCOMP_PREFIX)/src type1 ./gap$(EXEEXT)

.PHONY: docomp


########################################################################
# The "ffdata" target regenerates src/ffdata.{c,h} using etc/ffgen.c
########################################################################

ffgen: etc/ffgen.c
	$(QUIET_CC)$(CC) -Wall -Wextra $< -o $@

ffdata: ffgen
	./ffgen -h > $(abs_srcdir)/src/ffdata.h
	./ffgen -c > $(abs_srcdir)/src/ffdata.c

.PHONY: ffdata


########################################################################
# The "tags" target regenerates the tags file using Exuberant Ctags
########################################################################

tags:
	cd $(abs_srcdir) && etc/tags.sh --recurse lib hpcgap/lib src

etags:
	cd $(abs_srcdir) && etc/tags.sh -e --recurse lib hpcgap/lib src

.PHONY: tags etags


########################################################################
# Rules for 'make clean'
########################################################################
distclean: clean
	rm -f config.log config.status libtool stamp-h GNUmakefile configure
	rm -f bin/gap.sh sysinfo.gap*
	rm -f doc/make_doc
	rm -rf gen
	rm -rf dev/log
	rm -rf coverage
	rm -rf tags
	rm -rf TAGS
	rmdir bin cnf dev doc src 2>/dev/null || : # remove dirs if they are now empty

clean:
	rm -rf bin/$(GAPARCH)
	rm -rf obj
	rm -f gap$(EXEEXT) gac ffgen
	rm -f libgap.la
	rm -f gen/gap_version.c
	rm -f doc/wsp.g
	rm -f cnf/GAP-{CFLAGS,CPPFLAGS,LDFLAGS,LIBS,OBJS}

.PHONY: clean distclean


########################################################################
# Rules for 'make install'
########################################################################

LTINSTALL=$(LIBTOOL) --mode=install $(INSTALL)

install: install-libgap install-headers
	@echo "Warning, 'make install' has not yet been fully implemented"
	$(QUIET_INSTALL)$(INSTALL) -d -m 0755 $(DESTDIR)$(bindir)
	$(QUIET_INSTALL)$(INSTALL) gap $(DESTDIR)$(bindir)
	$(QUIET_INSTALL)$(INSTALL) gac $(DESTDIR)$(bindir)

install-headers:
	$(QUIET_INSTALL)$(INSTALL) -d -m 0755 $(DESTDIR)$(includedir)/gap
	$(QUIET_INSTALL)$(INSTALL) -d -m 0755 $(DESTDIR)$(includedir)/gap/hpc
	$(QUIET_INSTALL)$(INSTALL) -m 0644 $(srcdir)/src/*.h $(DESTDIR)$(includedir)/gap
	$(QUIET_INSTALL)$(INSTALL) -m 0644 $(srcdir)/src/hpc/*.h $(DESTDIR)$(includedir)/gap/hpc
	sed -i -E -e 's;#include <src/([^>]+)>;#include "\1";' $(DESTDIR)$(includedir)/gap/*.h
	sed -i -E -e 's;#include <src/([^>]+)>;#include "\1";' $(DESTDIR)$(includedir)/gap/hpc/*.h
	# TODO: take care of config.h

install-libgap: libgap.la
	$(QUIET_INSTALL)$(INSTALL) -d -m 0755 $(DESTDIR)$(libdir)
	$(QUIET_INSTALL)$(LTINSTALL) libgap.la $(DESTDIR)$(libdir)


.PHONY: install install-libgap

########################################################################
# Building subprojects
########################################################################


# master target for external dependencies / subprojects
EXTERN_FILES =


#
# GMP
#
ifeq ($(BUILD_GMP),yes)

GMP_BUILDDIR := extern/build/gmp
GMP_PREFIX := extern/install/gmp
# GMP_PREREQ := $(GMP_BUILDDIR)/config.status
GMP_FILES := $(GMP_PREFIX)/lib/libgmp.la

EXTERN_FILES += $(GMP_FILES)

# Note: we pass the ABI flag to gmp, and also --enable-shared ; the latter
# is there for the benefit of cygwin builds, where GMP otherwise defaults
# to building only a static library.
# We touch gmp.info so GMP does not think it is out of date and rebuilds it,
# because that requires makeinfo
gmp: $(GMP_FILES)
$(GMP_FILES):
	touch "$(abs_srcdir)/extern/gmp/doc/gmp.info"
	MAKE=$(MAKE) $(srcdir)/cnf/build-extern.sh gmp "$(abs_srcdir)/extern/gmp" ABI=$(ABI) --disable-static --enable-shared

.PHONY: gmp

# TODO: add clean, distclean, check targets?
# TODO: pass on cachfile?
# TODO: pass on certain *FLAGS ?


else

gmp:
	echo "Using external GMP, nothing to do be done"

endif # BUILD_GMP


#
# libatomic_ops
#
ifeq ($(BUILD_LIBATOMIC_OPS),yes)

LIBATOMIC_OPS_BUILDDIR := extern/build/libatomic_ops
LIBATOMIC_OPS_PREFIX := extern/install/libatomic_ops
#LIBATOMIC_OPS_PREREQ := $(LIBATOMIC_OPS_BUILDDIR)/config.status
LIBATOMIC_OPS_FILES := $(LIBATOMIC_OPS_PREFIX)/lib/libatomic_ops.la

EXTERN_FILES += $(LIBATOMIC_OPS_FILES)

libatomic_ops: $(LIBATOMIC_OPS_FILES)
$(LIBATOMIC_OPS_FILES):
	MAKE=$(MAKE) CFLAGS=$(ABI_CFLAGS) LDFLAGS=$(ABI_CFLAGS) \
	$(srcdir)/cnf/build-extern.sh libatomic_ops "$(abs_srcdir)/hpcgap/extern/libatomic_ops" --disable-static --enable-shared

# TODO: MAKEFLAGS=-j1

.PHONY: libatomic_ops

endif # BUILD_LIBATOMIC_OPS


#
# Boehm GC
#
ifeq ($(BUILD_BOEHM_GC),yes)

# TODO: ensure Boehm GC is built *after* libatomic_ops, at least if
# we are building or own libatomic_ops.
# Also, ensure that it uses the right version of libatomic_ops,
# by passing --with-libatomic-ops=...

# TODO: also pass

# TODO: refactor code which handles dependencies like GMP, Boehm, libatomic,
# to reduce code duplication.

# TODO: pass on more things to configure, e.g. the build / host system type...
# 

BOEHM_GC_BUILDDIR := extern/build/gc
BOEHM_GC_PREFIX := extern/install/gc
#BOEHM_GC_PREREQ := $(BOEHM_GC_BUILDDIR)/config.status
BOEHM_GC_FILES := $(BOEHM_GC_PREFIX)/lib/libgc.la

EXTERN_FILES += $(BOEHM_GC_FILES)

boehm: gc # alias
gc: $(BOEHM_GC_FILES)
$(BOEHM_GC_FILES):
	MAKE=$(MAKE) \
	CFLAGS=$(ABI_CFLAGS) \
	LDFLAGS=$(ABI_CFLAGS) \
	ATOMIC_OPS_CFLAGS=$(LIBATOMIC_OPS_CPPFLAGS) \
	ATOMIC_OPS_LIBS=$(LIBATOMIC_OPS_LDFLAGS) \
	$(srcdir)/cnf/build-extern.sh gc "$(abs_srcdir)/hpcgap/extern/gc" --disable-static --enable-shared

ifeq ($(BUILD_LIBATOMIC_OPS),yes)
$(BOEHM_GC_FILES): $(LIBATOMIC_OPS_FILES)
endif

.PHONY: boehm gc

endif # BUILD_BOEHM_GC


# ensure subprojects are built and "installed" before compiling and linking GAP
gap$(EXEEXT): $(EXTERN_FILES)
$(OBJS): $(EXTERN_FILES)
ifeq ($(HPCGAP),yes)
$(SOURCES): $(EXTERN_FILES)
endif

distclean: distclean-extern
distclean-extern:
	rm -rf extern/build
	rm -rf extern/install


########################################################################
# Compatibility mode
#
# If enabled, we prepare the environment to look like it did with
# the old build system, thus enabling existing packages with kernel
# extensions to be compiled against this version of GAP/
########################################################################
ifeq ($(COMPAT_MODE),yes)

# regenerate sysinfo.gap if necessary
all: sysinfo.gap
sysinfo.gap: config.status $(srcdir)/Makefile.rules cnf/GAP-CFLAGS cnf/GAP-CPPFLAGS cnf/GAP-LDFLAGS cnf/GAP-LIBS
	@rm -f sysinfo.gap	# in case this is a symlink created by an older version of the build system
	@echo "# This files has been generated by the GAP build system," > $@
	@echo "# do not edit manually!" >> $@
	@echo "GAParch=$(GAPARCH)" >> $@
	@echo "GAP_ABI=$(ABI)" >> $@
	@echo "" >> $@
	@echo "GAP_BIN_DIR=\"$(abs_builddir)\"" >> $@
	@echo "GAP_LIB_DIR=\"$(abs_srcdir)\"" >> $@
	@echo "" >> $@
	@echo "GAP_CC=\"$(CC)\"" >> $@
	@echo "GAP_CFLAGS=\"$(GAP_CFLAGS)\"" >> $@
	@echo "GAP_CPPFLAGS=\"$(GAP_PKG_CPPFLAGS)\"" >> $@
	@echo "GAP_LDFLAGS=\"$(GAP_LDFLAGS)\"" >> $@
	@echo "GAP_LIBS=\"$(GAP_LIBS)\"" >> $@
	@echo "" >> $@
	@echo "GAP_OBJS=\"$(OBJS)\"" >> $@

# regenerate bin/gap.sh if necessary
all: bin/gap.sh
bin/gap.sh: $(srcdir)/cnf/compat/gap.sh.in config.status
	$(SHELL) ./config.status $@

# regenerate symlinks if necessary
all: symlinks
symlinks: FORCE
	@$(MKDIR_P) bin/$(GAPARCH)
	@if test -L sysinfo.gap ; then rm -f sysinfo.gap && $(MAKE) sysinfo.gap ; fi
	@$(srcdir)/cnf/REGEN-SYMLINK sysinfo.gap sysinfo.gap-default$(ABI)
	@$(srcdir)/cnf/REGEN-SYMLINK $(abs_srcdir)/src bin/$(GAPARCH)/src
	@$(srcdir)/cnf/REGEN-SYMLINK ../../gac bin/$(GAPARCH)/gac
	@$(srcdir)/cnf/REGEN-SYMLINK ../../gap bin/$(GAPARCH)/gap
	@$(srcdir)/cnf/REGEN-SYMLINK ../../gen/config.h bin/$(GAPARCH)/config.h

.PHONY: symlinks

endif

########################################################################
# Specifying GAP calls to use for the test suite and building manuals
########################################################################

GAPARGS=
TESTGAP = $(abs_builddir)/bin/gap.sh --quitonbreak -b -m 100m -o 1g -q -x 80 -r -A $(GAPARGS)
TESTGAPauto = $(abs_builddir)/bin/gap.sh --quitonbreak -b -m 100m -o 1g -q -x 80 -r $(GAPARGS)

########################################################################
# Documentation rules
########################################################################

# Alias for backwards compatibility
manuals: doc

doc: gap$(EXEEXT) doc/make_doc
	doc/make_doc

clean-doc:
	rm -f doc/*/chap*.html doc/*/chap*.txt doc/*/*.css doc/*/*.js
	rm -f doc/*/chooser.html doc/*/manual*.pdf
	rm -f doc/*/*.{aux,bbl,blg,brf,idx,ilg,ind,lab,log,out,pnr,six,tex,toc}
	rm -f doc/manualbib.xml.bib

# FIXME: we currently build the manual inside $srcdir; so we don't want "make clean"
# to remove it, as other builds might share the manual.
#clean: clean-doc

# Manual consistency check
check-manuals: all
	$(MKDIR_P) dev/log
	((cd doc/ref ; \
	  echo 'Read("testconsistency.g");' | $(TESTGAP) ) \
	  > `date -u +dev/log/check_manuals_%Y-%m-%d-%H-%M` 2>&1 )

.PHONY: doc clean-doc manuals check-manuals

########################################################################
# Rules for test{install/standard/etc.} targets
########################################################################

# run testinstall.g twice:
# - without packages (except needed to run GAP)
# - with all packages loaded
testinstall: all
	$(MKDIR_P) dev/log
	( echo 'SetUserPreference("UseColorsInTerminal",false); \
            ReadGapRoot( "tst/testinstall.g" );' | $(TESTGAP) | \
            tee `date -u +dev/log/testinstall1_%Y-%m-%d-%H-%M` )
	( echo 'SetUserPreference("UseColorsInTerminal",false); LoadAllPackages(); \
            ReadGapRoot( "tst/testinstall.g" );' | $(TESTGAP) | \
            tee `date -u +dev/log/testinstall2_%Y-%m-%d-%H-%M` )

# test manual examples three times:
# - without packages
# - with packages loaded by default
# - with all packages loaded
testmanuals: all
	$(MKDIR_P) dev/log
	((cd doc/tut ; \
	  echo 'SetUserPreference("UseColorsInTerminal",false); SetAssertionLevel( 2 ); \
	  Read("extractexamples.g"); Read("runexamples.g"); ' | $(TESTGAP);\
	  echo '============================================================';\
	  cd ../.. ; ff=`ls doc/tut/EXAMPLEDIFFS* 2> /dev/null | wc -l`; \
	  if [ $$ff != "0" ] ; then cat doc/tut/EXAMPLEDIFFS*; \
	  else echo "NO DIFFERENCES IN TUTORIAL EXAMPLES (NO PACKAGES)"; fi ; \
	  echo '============================================================';\
	  cd doc/ref ; \
	  echo 'SetUserPreference("UseColorsInTerminal",false); SetAssertionLevel( 2 ); \
	  Read("extractexamples.g"); Read("runexamples.g"); ' | $(TESTGAP);\
	  echo '============================================================';\
	  cd ../.. ; ff=`ls doc/ref/EXAMPLEDIFFS* 2> /dev/null | wc -l`; \
	  if [ $$ff != "0" ] ; then cat doc/ref/EXAMPLEDIFFS*; \
	  else echo "NO DIFFERENCES IN REFERENCE MANUAL EXAMPLES (NO PACKAGES)"; fi ) \
	  > `date -u +dev/log/testmanuals1_%Y-%m-%d-%H-%M` 2>&1 )
	( rm -rf doc/tut/EXAMPLEDIFFS*; rm -rf doc/ref/EXAMPLEDIFFS* )
	((cd doc/tut ; \
	  echo 'SetUserPreference("UseColorsInTerminal",false); SetAssertionLevel( 2 ); \
	  Read("extractexamples.g"); Read("runexamples.g"); ' | $(TESTGAPauto);\
	  echo '============================================================';\
	  cd ../.. ; ff=`ls doc/tut/EXAMPLEDIFFS* 2> /dev/null | wc -l`; \
	  if [ $$ff != "0" ] ; then cat doc/tut/EXAMPLEDIFFS*; \
	  else echo "NO DIFFERENCES IN TUTORIAL EXAMPLES (DEFAULT PACKAGES)"; fi ; \
	  echo '============================================================';\
	  cd doc/ref ; \
	  echo 'SetUserPreference("UseColorsInTerminal",false); SetAssertionLevel( 2 ); \
	  Read("extractexamples.g"); Read("runexamples.g"); ' | $(TESTGAPauto);\
	  echo '============================================================';\
	  cd ../.. ; ff=`ls doc/ref/EXAMPLEDIFFS* 2> /dev/null | wc -l`; \
	  if [ $$ff != "0" ] ; then cat doc/ref/EXAMPLEDIFFS*; \
	  else echo "NO DIFFERENCES IN REFERENCE MANUAL EXAMPLES (DEFAULT PACKAGES)"; fi ) \
	  > `date -u +dev/log/testmanualsA_%Y-%m-%d-%H-%M` 2>&1 )
	( rm -rf doc/tut/EXAMPLEDIFFS*; rm -rf doc/ref/EXAMPLEDIFFS* )
	((cd doc/tut ; \
	  echo 'SetUserPreference("UseColorsInTerminal",false); SetAssertionLevel( 2 ); \
	  LoadAllPackages() ; \
	  Read("extractexamples.g"); Read("runexamples.g"); ' | $(TESTGAP);\
	  echo '============================================================';\
	  cd ../.. ; ff=`ls doc/tut/EXAMPLEDIFFS* 2> /dev/null | wc -l`; \
	  if [ $$ff != "0" ] ; then cat doc/tut/EXAMPLEDIFFS*; \
	  else echo "NO DIFFERENCES IN TUTORIAL EXAMPLES (ALL PACKAGES)"; fi ; \
	  echo '============================================================';\
	  cd doc/ref ; \
	  echo 'SetUserPreference("UseColorsInTerminal",false); SetAssertionLevel( 2 ); \
	  LoadAllPackages() ; \
	  Read("extractexamples.g"); Read("runexamples.g"); ' | $(TESTGAP);\
	  echo '============================================================';\
	  cd ../.. ; ff=`ls doc/ref/EXAMPLEDIFFS* 2> /dev/null | wc -l`; \
	  if [ $$ff != "0" ] ; then cat doc/ref/EXAMPLEDIFFS*; \
	  else echo "NO DIFFERENCES IN REFERENCE MANUAL EXAMPLES (ALL PACKAGES)"; fi ) \
	  > `date -u +dev/log/testmanuals2_%Y-%m-%d-%H-%M` 2>&1 )
	( rm -rf doc/tut/EXAMPLEDIFFS*; rm -rf doc/ref/EXAMPLEDIFFS* )

# check how packages are loaded when loading obsoletes is disabled
# - when all dependencies are loaded
# - when packages are loaded with `OnlyNeeded` option
testobsoletes: all
	$(MKDIR_P) dev/log
	( echo 'ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) -O )
	( echo 'CreatePackageLoadTestsInput( "testobsoletes1.in", \
            "dev/log/testobsoletes1", \
            "$(TESTGAP) -O -L wsp.g", false, false );'\
            | $(TESTGAP) -O -L wsp.g > /dev/null )
	( chmod 777 testobsoletes1.in; ./testobsoletes1.in > \
            `date -u +dev/log/testobsoletes1_%Y-%m-%d-%H-%M`; rm testobsoletes1.in )
	( rm wsp.g )
	( echo 'ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) -O )
	( echo 'CreatePackageLoadTestsInput( "testobsoletesN1.in", \
            "dev/log/testobsoletesN1", \
            "$(TESTGAP) -O -L wsp.g", false, true );'\
            | $(TESTGAP) -O -L wsp.g > /dev/null )
	( chmod 777 testobsoletesN1.in; ./testobsoletesN1.in > \
            `date -u +dev/log/testobsoletesN1_%Y-%m-%d-%H-%M`; rm testobsoletesN1.in )
	( rm wsp.g )

# For a package with the name given by the PKGNAME variable,
# run its standard tests (i.e. those specified in PackageInfo.g):
# - in GAP started without packages
# - in GAP started with packages loaded by default
# - in GAP started with all packages loaded
testpackage: all
	$(MKDIR_P) dev/log
	( echo 'SetAssertionLevel( 2 ); ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) )
	( echo 'CreatePackageTestsInput( "testpackage.in", \
            "dev/log/testpackage1", \
            "$(TESTGAP) -L wsp.g", "false", "$(PKGNAME)" );'\
            | $(TESTGAP) -L wsp.g > /dev/null )
	( chmod 777 testpackage.in; ./testpackage.in; rm testpackage.in )
	( rm wsp.g )
	( echo 'SetAssertionLevel( 2 ); ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAPauto) )
	( echo 'CreatePackageTestsInput( "testpackage.in", \
            "dev/log/testpackageA", \
            "$(TESTGAPauto) -L wsp.g", "auto", "$(PKGNAME)" );'\
            | $(TESTGAPauto) -L wsp.g > /dev/null )
	( chmod 777 testpackage.in; ./testpackage.in; rm testpackage.in )
	( rm wsp.g )
	( echo 'SetAssertionLevel( 2 ); ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) )
	( echo 'CreatePackageTestsInput( "testpackage.in", \
            "dev/log/testpackage2", \
            "$(TESTGAP) -L wsp.g", "true", "$(PKGNAME)" );'\
            | $(TESTGAP) -L wsp.g > /dev/null )
	( chmod 777 testpackage.in; ./testpackage.in; rm testpackage.in )
	( rm wsp.g )

# For each package that specifies its standard tests in PackageInfo.g, run it
# - in GAP started without packages
# - in GAP started with packages loaded by default
# - in GAP started with all packages loaded
testpackages: all
	$(MKDIR_P) dev/log
	( echo 'SetAssertionLevel( 2 ); ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) )
	( echo 'CreatePackageTestsInput( "testpackages.in", \
            "dev/log/testpackages1", \
            "$(TESTGAP) -L wsp.g", "false" );'\
            | $(TESTGAP) -L wsp.g > /dev/null )
	( chmod 777 testpackages.in; ./testpackages.in; rm testpackages.in )
	( rm wsp.g )
	( echo 'SetAssertionLevel( 2 ); ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAPauto) )
	( echo 'CreatePackageTestsInput( "testpackages.in", \
            "dev/log/testpackagesA", \
            "$(TESTGAPauto) -L wsp.g", "auto" );'\
            | $(TESTGAPauto) -L wsp.g > /dev/null )
	( chmod 777 testpackages.in; ./testpackages.in; rm testpackages.in )
	( rm wsp.g )
	( echo 'SetAssertionLevel( 2 ); ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) )
	( echo 'CreatePackageTestsInput( "testpackages.in", \
            "dev/log/testpackages2", \
            "$(TESTGAP) -L wsp.g", "true" );'\
            | $(TESTGAP) -L wsp.g > /dev/null )
	( chmod 777 testpackages.in; ./testpackages.in; rm testpackages.in )
	( rm wsp.g )

# check how packages are loaded
# - when all dependencies are loaded
# - when packages are loaded with `OnlyNeeded` option
testpackagesload: all
	$(MKDIR_P) dev/log
	( echo 'ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) )
	( echo 'CreatePackageLoadTestsInput( "testpackagesload.in", \
            "dev/log/testpackagesload1", \
            "$(TESTGAP) -L wsp.g", false, false );'\
            | $(TESTGAP) -L wsp.g > /dev/null )
	( chmod 777 testpackagesload.in; ./testpackagesload.in > \
            `date -u +dev/log/testpackagesload1_%Y-%m-%d-%H-%M`; rm testpackagesload.in )
	( rm wsp.g )
	( echo 'ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) )
	( echo 'CreatePackageLoadTestsInput( "testpackagesload.in", \
            "dev/log/testpackagesloadN1", \
            "$(TESTGAP) -L wsp.g", false, true );'\
            | $(TESTGAP) -L wsp.g > /dev/null )
	( chmod 777 testpackagesload.in; ./testpackagesload.in > \
            `date -u +dev/log/testpackagesloadN1_%Y-%m-%d-%H-%M`; rm testpackagesload.in )
	( rm wsp.g )
	( echo 'ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAPauto) )
	( echo 'CreatePackageLoadTestsInput( "testpackagesload.in", \
            "testpackagesloadA", \
            "$(TESTGAPauto) -L wsp.g", true, false );'\
            | $(TESTGAPauto) -L wsp.g > /dev/null )
	( chmod 777 testpackagesload.in; ./testpackagesload.in > \
            `date -u +dev/log/testpackagesloadA_%Y-%m-%d-%H-%M`; rm testpackagesload.in )
	( rm wsp.g )
	( echo 'ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAPauto) )
	( echo 'CreatePackageLoadTestsInput( "testpackagesload.in", \
            "testpackagesloadNA", \
            "$(TESTGAPauto) -L wsp.g", true, true );'\
            | $(TESTGAPauto) -L wsp.g > /dev/null )
	( chmod 777 testpackagesload.in; ./testpackagesload.in > \
            `date -u +dev/log/testpackagesloadNA_%Y-%m-%d-%H-%M`; rm testpackagesload.in )
	( rm wsp.g )

# Produce an overview of new variables defined by each package
testpackagesvars: all
	$(MKDIR_P) dev/log
	( echo 'ReadGapRoot( "tst/testutil.g" ); \
            SaveWorkspace( "wsp.g" );' | $(TESTGAP) )
	( echo 'CreatePackageVarsTestsInput( "testpackagesvars.in", \
            "dev/log/testpackagesvars", \
            "$(TESTGAP) -L wsp.g" );'\
            | $(TESTGAP) -L wsp.g > /dev/null )
	( chmod 777 testpackagesvars.in; ./testpackagesvars.in > \
            `date -u +dev/log/testpackagesvars_%Y-%m-%d-%H-%M`; rm testpackagesvars.in )
	( rm wsp.g )

# run teststandard.g twice:
# - without packages (except needed to run GAP)
# - with all packages loaded
teststandard: all
	$(MKDIR_P) dev/log
	( echo 'SetUserPreference("UseColorsInTerminal",false); \
          ReadGapRoot( "tst/teststandard.g" );' | $(TESTGAP) | \
            tee `date -u +dev/log/teststandard1_%Y-%m-%d-%H-%M` )
	( echo 'SetUserPreference("UseColorsInTerminal",false); LoadAllPackages(); \
          ReadGapRoot( "tst/teststandard.g" );' | $(TESTGAP) | \
            tee `date -u +dev/log/teststandard2_%Y-%m-%d-%H-%M` )

# run testbugfix.g twice:
# - without packages (except needed to run GAP)
# - with all packages loaded
testbugfix: all
	$(MKDIR_P) dev/log
	( echo 'SetUserPreference("UseColorsInTerminal",false); \
          ReadGapRoot( "tst/testbugfix.g" );' | $(TESTGAP) | \
            tee `date -u +dev/log/testbugfix1_%Y-%m-%d-%H-%M` )
	( echo 'SetUserPreference("UseColorsInTerminal",false); LoadAllPackages(); \
          ReadGapRoot( "tst/testbugfix.g" );' | $(TESTGAP) | \
            tee `date -u +dev/log/testbugfix2_%Y-%m-%d-%H-%M` )

coverage:
	gcov -o . $(SOURCES)

.PHONY: testinstall testmanuals testobsoletes teststandard testbugfix
.PHONY: testpackage testpackages testpackagesload testpackagesvars
.PHONY: coverage

########################################################################
# Bootstrap rules
########################################################################

# change PKG_BRANCH to stable-X.Y in the stable branch
PKG_BRANCH = master
PKG_BOOTSTRAP_URL = https://www.gap-system.org/pub/gap/gap4pkgs/
PKG_MINIMAL = packages-required-$(PKG_BRANCH).tar.gz
PKG_FULL = packages-$(PKG_BRANCH).tar.gz
WGET = wget -N

bootstrap-pkg-minimal:
	@if test -e pkg; then \
        echo "The pkg directory already exists. Please move or remove it to proceed."; \
    else \
        $(WGET) $(PKG_BOOTSTRAP_URL)$(PKG_MINIMAL) && \
        mkdir pkg && \
        cd pkg && \
        tar xzf ../$(PKG_MINIMAL) ; \
    fi;

bootstrap-pkg-full:
	@if test -e pkg; then \
        echo "The pkg directory already exists. Please move or remove it to proceed" ; \
    else \
        $(WGET) $(PKG_BOOTSTRAP_URL)$(PKG_FULL) && \
        mkdir pkg && \
        cd pkg && \
        tar xzf ../$(PKG_FULL) ; \
    fi;

.PHONY: bootstrap-pkg-minimal bootstrap-pkg-full

########################################################################
# Test runner rules
########################################################################

# TODO


########################################################################
# Track CFLAGS, CPPFLAGS, LDFLAGS, LIBS, OBJS
#
# For each variable GAP_XYZ in the above list, we do the following:
# First, escape all single quotation marks in GAP_XYZ. Then compare
# GAP_XYZ with the content of file cnf/GAP-XYZ. Do nothing if they
# match. Otherwise, write GAP_XYZ into cnf/GAP-XYZ. By only writing
# something if there is a change, we avoid triggering unnecessary
# rebuilds.
#
# The files cnf/GAP-XYZ in turn now allow us to rebuild things if any of
# these variables change. Moreover, package build systems can extract
# relevant flags from them.
#
# This code is closely based on code from the git build system.
########################################################################

ESCAPED_CFLAGS = $(subst ','\'',$(GAP_CFLAGS))

cnf/GAP-CFLAGS: FORCE
	@mkdir -p cnf
	@FLAGS='$(ESCAPED_CFLAGS)'; \
	    if test x"$$FLAGS" != x"`cat cnf/GAP-CFLAGS 2>/dev/null`" ; then \
		echo >&2 "    * new compiler flags"; \
		echo "$$FLAGS" >cnf/GAP-CFLAGS; \
            fi

ESCAPED_CPPFLAGS = $(subst ','\'',$(GAP_CPPFLAGS))

cnf/GAP-CPPFLAGS: FORCE
	@mkdir -p cnf
	@FLAGS='$(ESCAPED_CPPFLAGS)'; \
	    if test x"$$FLAGS" != x"`cat cnf/GAP-CPPFLAGS 2>/dev/null`" ; then \
		echo >&2 "    * new preprocessor flags"; \
		echo "$$FLAGS" >cnf/GAP-CPPFLAGS; \
            fi

ESCAPED_LDFLAGS = $(subst ','\'',$(GAP_LDFLAGS))

cnf/GAP-LDFLAGS: FORCE
	@mkdir -p cnf
	@FLAGS='$(ESCAPED_LDFLAGS)'; \
	    if test x"$$FLAGS" != x"`cat cnf/GAP-LDFLAGS 2>/dev/null`" ; then \
		echo >&2 "    * new link flags"; \
		echo "$$FLAGS" >cnf/GAP-LDFLAGS; \
            fi

ESCAPED_LIBS = $(subst ','\'',$(GAP_LIBS))

cnf/GAP-LIBS: FORCE
	@mkdir -p cnf
	@FLAGS='$(ESCAPED_LIBS)'; \
	    if test x"$$FLAGS" != x"`cat cnf/GAP-LIBS 2>/dev/null`" ; then \
		echo >&2 "    * new library flags"; \
		echo "$$FLAGS" >cnf/GAP-LIBS; \
            fi

ESCAPED_OBJS = $(subst ','\'',$(OBJS))

cnf/GAP-OBJS: FORCE
	@mkdir -p cnf
	@FLAGS='$(ESCAPED_OBJS)'; \
	    if test x"$$FLAGS" != x"`cat cnf/GAP-OBJS 2>/dev/null`" ; then \
		echo >&2 "    * new object list"; \
		echo "$$FLAGS" >cnf/GAP-OBJS; \
            fi


########################################################################
# Handle version information
#
# The approach we use is based on what git.git does. It stores the
# generated version in a separate file cnf/GAP-VERSION-FILE, which makes
# it possible to cleverly handle rebuilding files that use the version.
# It also makes it possible to use version in non-C-code later one,
# should we need to.
########################################################################

GVF = $(srcdir)/cnf/GAP-VERSION-FILE

# the GAP-VERSION-FILE contains the raw version, nothing else
$(GVF): FORCE
	@cd $(srcdir) && $(SHELL) cnf/GAP-VERSION-GEN
-include $(GVF)

# generate gen/gap_version.c
gen/gap_version.c: $(srcdir)/src/gap_version.c.in $(GVF)
	@$(MKDIR_P) $(@D)
	$(QUIET_SED)sed -e "s/@GAP_VERSION@/$(GAP_VERSION)/" < $< > $@


########################################################################
# Regenerate parts of the build system as needed.
# The following is based in parts on the corresponding automake rules,
# and in parts on an example in the autoconf manual.
########################################################################

ACLOCAL_M4 = $(srcdir)/aclocal.m4 $(wildcard $(srcdir)/cnf/m4/*.m4)
configure_deps = $(srcdir)/configure.ac $(ACLOCAL_M4)

config.status: $(srcdir)/configure
	$(SHELL) ./config.status --recheck

$(srcdir)/configure: $(configure_deps)
	@if command -v autoconf >/dev/null 2>&1 ; then \
	   cd $(srcdir) && autoconf ; \
	 else \
	   echo "autoconf not available, proceeding with stale configure" ; \
	 fi

gen/config.h: gen/stamp-h
	@if test ! -f $@; then rm -f gen/stamp-h; else :; fi
	@if test ! -f $@; then $(MAKE) gen/stamp-h; else :; fi

gen/stamp-h: $(srcdir)/src/config.h.in config.status
	@rm -f gen/stamp-h
	$(SHELL) ./config.status gen/config.h
	echo > $@

$(srcdir)/src/config.h.in: $(configure_deps) 
	@if command -v autoheader >/dev/null 2>&1 ; then \
	   cd $(srcdir) && autoheader ; \
	   rm -f gen/stamp-h ; \
	 else \
	   echo "autoheader not available, proceeding with stale config.h" ; \
	 fi
	touch $@

GNUmakefile: $(srcdir)/GNUmakefile.in config.status
	$(SHELL) ./config.status $@

doc/make_doc: $(srcdir)/doc/make_doc.in config.status
	$(SHELL) ./config.status $@

gac: $(srcdir)/cnf/gac.in config.status
	$(SHELL) ./config.status $@


########################################################################
# Special .PHONY target: targets depending on it will always be
# considered dirty by target, hence are forced to be re-run
########################################################################
.PHONY: FORCE