[pulseaudio-discuss] [PATCH 4/6] compilation: Set C language standard to gnu11

[Ahmed S. Darwish]

Per glibc feature_test_macros(7), setting compiler flags to
-std=c11 (or any c* variant like c99) enforces strict ANSI
mode.

Enforcing strict ANSI makes all declarations under _GNU_SOURCE
unavailable. This leads to build warnings in the form of:

    warning: implicit declaration of function ‘syscall’

Thus replace -std=c11 with -std=gnu11

Signed-off-by: Ahmed S. Darwish <darwish.07 at gmail.com>
---
 configure.ac    | 4 ++--
 src/Makefile.am | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 8454e4c..fc1e299 100644
--- a/configure.ac
+++ b/configure.ac
@@ -176,9 +176,9 @@ esac
 
 #### Compiler flags ####
 
-AX_CHECK_COMPILE_FLAG([-std=c11],
+AX_CHECK_COMPILE_FLAG([-std=gnu11],
    [],
-   [AC_MSG_ERROR([*** Compiler does not support -std=c11])],
+   [AC_MSG_ERROR([*** Compiler does not support -std=gnu11])],
    [-pedantic -Werror])
 
 AX_APPEND_COMPILE_FLAGS(
diff --git a/src/Makefile.am b/src/Makefile.am
index aa96999..b979d46 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -48,7 +48,7 @@ AM_CPPFLAGS = \
 	-DPA_SRCDIR=\"$(abs_srcdir)\" \
 	-DPA_BUILDDIR=\"$(abs_builddir)\" \
 	-DPULSE_LOCALEDIR=\"$(localedir)\"
-AM_CFLAGS = -std=c11 \
+AM_CFLAGS = -std=gnu11 \
 	$(PTHREAD_CFLAGS)
 AM_CXXFLAGS = -std=c++11 \
 	$(PTHREAD_CFLAGS)


Regards,

--
Darwish
http://darwish.chasingpointers.com