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dnl We prefer -std=gnu90 but gcc versions prior to 4.5.0 don't support
dnl it. AX_CHECK_COMPILE_FLAG is the right way to determine whether a
dnl particular version of gcc supports a flag, but it requires autoconf
dnl 2.64. Since (for now) we still want to support older releases
dnl that ship with autoconf 2.63, we the also-deprecated AX_GCC_VERSION
dnl macro there.
AC_DEFUN([BTRFS_DETECT_CSTD],
[
m4_version_prereq([2.64], [
AX_CHECK_COMPILE_FLAG([-std=gnu90],
[BTRFS_CSTD_FLAGS=-std=gnu90],
[BTRFS_CSTD_FLAGS=-std=gnu89])
], [
AX_GCC_VERSION([4], [5], [0],
[BTRFS_CSTD_FLAGS=-std=gnu90],
[BTRFS_CSTD_FLAGS=-std=gnu89])
])
AC_SUBST([BTRFS_CSTD_FLAGS])
]) dnl BTRFS_DETECT_CSTD
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