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AC_DEFUN([AC_PROG_CC_PIE], [
AC_CACHE_CHECK([whether ${CC-cc} accepts -fPIE], ac_cv_prog_cc_pie, [
echo 'void f(){}' > conftest.c
if test -z "`${CC-cc} -fPIE -pie -c conftest.c 2>&1`"; then
ac_cv_prog_cc_pie=yes
else
ac_cv_prog_cc_pie=no
fi
rm -rf conftest*
])
])
AC_DEFUN([COMPILER_FLAGS], [
if (test "${CFLAGS}" = ""); then
CFLAGS="-Wall -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2"
fi
if (test "$USE_MAINTAINER_MODE" = "yes"); then
CFLAGS+=" -Werror -Wextra"
CFLAGS+=" -Wno-unused-parameter"
CFLAGS+=" -Wno-missing-field-initializers"
CFLAGS+=" -Wdeclaration-after-statement"
CFLAGS+=" -Wmissing-declarations"
CFLAGS+=" -Wredundant-decls"
CFLAGS+=" -Wcast-align"
CFLAGS+=" -DG_DISABLE_DEPRECATED"
fi
])
AC_DEFUN([AX_CHECK_COMPILE_FLAG], [
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
[AS_VAR_SET(CACHEVAR,[yes])],
[AS_VAR_SET(CACHEVAR,[no])])
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
AS_VAR_IF(CACHEVAR,yes, [m4_default([$2], :)], [m4_default([$3], :)])
AS_VAR_POPDEF([CACHEVAR])
])
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