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[libpng16] Reformatted the new code in configure.ac

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Glenn Randers-Pehrson
2016-03-15 07:55:41 -05:00
parent 12e63e91af
commit 46861bc41e
3 changed files with 18 additions and 11 deletions
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21
configure.ac
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@@ -117,15 +117,20 @@ AC_ARG_ENABLE(werror,
# For GCC 5 the default mode for C is -std=gnu11 instead of -std=gnu89
# In pngpriv.h we request just the POSIX 1003.1 and C89 APIs by defining _POSIX_SOURCE to 1
# This is incompatible with the new default mode, so we test for that and force the
# "-std=c89" compiler option:
AC_MSG_CHECKING([if we need to force back C standard to C89])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([#define _POSIX_SOURCE 1
#include <stdio.h>
])],AC_MSG_RESULT(no),[
if test "x$GCC" != "xyes"; then
AC_MSG_ERROR([Forcing back to C89 is required but the flags are unknown for other compilers than GCC])
fi
AC_MSG_RESULT(yes)
CFLAGS="$CFLAGS -std=c89"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([
[#define _POSIX_SOURCE 1]
[#include <stdio.h>]
])],
AC_MSG_RESULT(no),[
if test "x$GCC" != "xyes"; then
AC_MSG_ERROR(
[Forcing back to C89 is required but the flags are only known for GCC])
fi
AC_MSG_RESULT(yes)
CFLAGS="$CFLAGS -std=c89"
])
# Checks for header files.