build: stop setting _POSIX_C_SOURCE

from feature_test_macros(7): > Defining _XOPEN_SOURCE with a value of 700 or greater produces the > same effects as defining _POSIX_C_SOURCE with a value of 200809L or > greater. Depending on the configuration and system pkg-conf files there can be redefinition warnings. Rather than patching with a -U_POSIX_C_SOURCE it can just be dropped instead.
martanne · Aug 16, 2023 · 3134de1 · 3134de1
1 parent 4360440
commit 3134de1
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/Makefile b/Makefile
@@ -46,7 +46,7 @@ CONFIG_TRE ?= 0
 CONFIG_ACL ?= 0
 CONFIG_SELINUX ?= 0
 
-CFLAGS_STD ?= -std=c99 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -DNDEBUG -MMD
+CFLAGS_STD ?= -std=c99 -U_XOPEN_SOURCE -D_XOPEN_SOURCE=700 -DNDEBUG -MMD
 CFLAGS_STD += -DVERSION=\"${VERSION}\"
 LDFLAGS_STD ?= -lc
 

diff --git a/configure b/configure
@@ -220,7 +220,7 @@ tryflag   CFLAGS_TRY  -Werror=unused-command-line-argument
 tryldflag LDFLAGS_TRY -Werror=unknown-warning-option
 tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument
 
-CFLAGS_STD="-std=c99 -D_POSIX_C_SOURCE=200809L -U_XOPEN_SOURCE -D_XOPEN_SOURCE=700 -DNDEBUG -MMD"
+CFLAGS_STD="-std=c99 -U_XOPEN_SOURCE -D_XOPEN_SOURCE=700 -DNDEBUG -MMD"
 LDFLAGS_STD="-lc"
 
 OS=$(uname)