Support --with-fc (#106)

Details:
* Adding --with-fc as a configure flag
* FC and FCFLAGS can be adjusted at configure time

Co-authored-by: ItsPitt <[email protected]>

build/ac-macros/fla_check_with_fc.m4

@@ -0,0 +1,63 @@
+AC_DEFUN([FLA_CHECK_WITH_FC],
+[
+	dnl Tell the user we're checking whether to enable the option.
+	AC_MSG_CHECKING([whether user requested a specific Fortran compiler])
+	
+	dnl Determine whether the user gave the --enable-<option> or
+	dnl --disable-<option>. If so, then run the first snippet of code;
+	dnl otherwise, run the second code block.
+	AC_ARG_WITH([fc],
+	            AS_HELP_STRING([--with-fc=fc],[Search for and use a Fortran compiler named <fc>. If <fc> is not found, then use the first compiler found from the default search list for the detected build architecture.]),
+	[
+		dnl If any form of the option is given, handle each case.
+		if test "$withval" = "no" ; then
+			
+			dnl User provided --with-<option>=no or --without-<option>.
+			fla_with_specific_fc=without
+			fla_requested_fc=''
+
+		elif test "$withval" = "yes" ; then
+			
+			dnl User provided --with-<option>=yes or --with-<option>.
+			fla_with_specific_fc=no
+			fla_requested_fc=''
+		else
+			
+			dnl User provided argument value: --with-<option>=value.
+			fla_with_specific_fc=yes
+			fla_requested_fc=$withval
+		fi
+	],
+	[
+		dnl User did not specify whether to enable or disable the option.
+		dnl Default behavior is to disable the option.
+		fla_with_specific_fc=no
+		fla_requested_fc=''
+	]
+	)
+	
+	dnl Now act according to whether a specific value was given.
+	if test "$fla_with_specific_fc" = "yes" ; then
+		
+		dnl Output the result.
+		AC_MSG_RESULT([yes ($fla_requested_fc)])
+		
+	elif test "$fla_with_specific_fc" = "without" ; then
+		
+		dnl Output the result.
+		AC_MSG_RESULT([no])
+		
+		dnl The user requested --with-fc=no or --without-fc. Scold him.
+		AC_MSG_ERROR([[Detected --without-fc. Cannot continue with Fortran compiler disabled!]])
+		
+	else
+		dnl Output the result.
+		AC_MSG_RESULT([no])
+	fi
+	
+	dnl Check for FC environment variable, which would override everything else.
+	if test "$FC" != "" ; then
+		AC_MSG_NOTICE([[FC environment variable is set to $FC, which will override --with-fc option and default search list for Fortran compiler.]])
+	fi
+
+])

build/ac-macros/fla_require_fc.m4

@@ -0,0 +1,28 @@
+AC_DEFUN([FLA_REQUIRE_FC],
+[
+	AC_REQUIRE([FLA_OBSERVE_HOST_CPU_TYPE])
+
+	dnl Save the value of FFLAGS. This will come in useful later in determining
+	dnl whether the user provided his own definition of FFLAGS.
+	fla_userdef_fflags=$FFLAGS
+	
+	dnl Find a Fortran compiler.
+	dnl If the FC environment variable is not already set, search for the
+	dnl compiler defined by fla_requested_fc (which may be empty) and then
+	dnl continue searching for the compilers in $fla_f_compiler_list, if
+	dnl necessary.
+	fla_f_compiler_list="gfortran f77 g77 xlf frt pgf77 cf77 fort77 fl32 af77 xlf90 f90 pgf90 pghpf epcf90 g95 xlf95 f95 fort ifort ifc efc pgfortran pgf95 lf95 ftn nagfor"
+	AC_PROG_FC([$fla_requested_fc $fla_f_compiler_list])
+
+	if test "$FC" = "" ; then
+		AC_MSG_ERROR([Could not locate any of the following Fortran compilers: $FC $fla_requested_fc $fla_f_compiler_list. Cannot continue without a Fortran compiler.],[1])
+	fi
+
+	dnl Ascertain the compiler "vendor".
+	dnl FC_VENDOR=$(echo "$FC" | egrep -o 'gfortran|f77|g77|xlf|frt|pgf77|cf77|fort77|fl32|af77|xlf90|f90|pgf90|pghpf|epcf90|g95|xlf95|f95|fort|ifort|ifc|efc|pgfortran|pgf95|lf95|ftn|nagfor' | { read first rest ; echo $first ; })
+	dnl AC_MSG_NOTICE([[FC_VENDOR environment variable is set to ${FC_VENDOR}.]])
+	
+	dnl Substitute the user-defined FFLAGS into the autoconf output files.
+	AC_SUBST(fla_userdef_fflags)
+	dnl AC_SUBST(FC_VENDOR)
+])

build/config.mk.in

@@ -155,6 +155,14 @@ ARFLAGS          := cr
 #AR_ARG_LIST_FILE := ar_arg_list
 AR_OBJ_LIST_FILE := ar_obj_list
 
+# --- Determine the Fortran compiler and related flags ---
+FC           := @FC@
+FC_VENDOR    := @FC_VENDOR@
+
+# If the user provided his own FFLAGS, allow them to override our own.
+ifneq (@fla_userdef_fflags@,)
+FFLAGS       := @FFLAGS@ $(FFLAGS)
+endif
 
 # --- Determine the python interpreter ---
 

build/post-configure.sh.in

@@ -30,6 +30,8 @@ echo "Enable maximum argument list hack............... : @fla_enable_max_arg_lis
 echo ""
 echo "C compiler...................................... : @CC@"
 echo "C compiler vendor............................... : @CC_VENDOR@"
+echo "Fortran compiler................................ : @FC@"
+echo "Fortran compiler vendor......................... : @FC_VENDOR@"
 echo "Library archiver................................ : @AR@"
 echo "Library archive indexer......................... : @RANLIB@"
 echo "Python interpreter.............................. : @PYTHON@"
@@ -113,6 +115,9 @@ echo "Enable LTO...................................... : @fla_enable_lto@"
 echo ""
 echo "User-specified CFLAGS (prepended)............... : @fla_userdef_cflags@"
 
+echo ""
+echo "User-specified FFLAGS (prepended)............... : @fla_userdef_fflags@"
+
 echo ""
 echo "Enable internal error checking.................. : @fla_enable_internal_error_checking@"
 if   [ "@fla_enable_internal_error_checking@" = "yes" ] ; then
@@ -154,17 +159,6 @@ if [ "@fla_enable_portable_timer@" = "yes" ] ; then
 echo "   Portable timer function...................... : @fla_portable_timer_function@"
 fi
 
-echo ""
-echo "Autodetect Fortran linker flags................. : @fla_enable_autodetect_f77_ldflags@"
-if [ "@fla_enable_autodetect_f77_ldflags@" = "yes" ] ; then
-echo "   Fortran linker flags......................... : @FLIBS@"
-fi
-echo "Autodetect Fortran name-mangling................ : @fla_enable_autodetect_f77_name_mangling@"
-if [ "@fla_enable_autodetect_f77_name_mangling@" = "yes" ] ; then
-echo "   Unmangled name............................... : @fla_f77_foobar_unmangled@"
-echo "   Mangled name................................. : @fla_f77_foobar_mangled@"
-fi
-
 echo ""
 echo "Installation directories"
 echo "   prefix....................................... : "'@prefix@'
@@ -175,13 +169,6 @@ echo "   header files will be installed in............ : "'@includedir@'
 echo ""
 echo "Configuration complete!"
 echo ""
-if [ "@fla_enable_autodetect_f77_ldflags@" = "yes" ] ; then
-echo "NOTE: Autodetection of Fortran linker flags was enabled. The configure"
-echo "script thinks that the flags listed above are necessary to successfully"
-echo "link a program to Fortran object code. If your program uses any Fortran"
-echo "libraries, you will probably need to link with these flags."
-echo ""
-fi
 echo "You may now run 'make' to build all libflame libraries and then 'make install'"
 echo "to install the libraries." 
 echo ""