diff options
| author | Jeff Mahoney <jeffm@suse.com> | 2018-04-30 10:37:08 -0400 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2018-06-07 16:37:35 +0200 |
| commit | eb7b42003a7d3a1d4c0253c6d5a248c9078c6d19 (patch) | |
| tree | f09fbe12c1bac6772668daa4fabc6f48e56bc835 /m4/ax_gcc_version.m4 | |
| parent | 1c73f56f5a41f44a6196d06675cfb0fcdd2bbd9d (diff) | |
btrfs-progs: build: detect whether -std=gnu90 is supported
GCC releases prior to 4.5.0 don't support -std=gnu90 so btrfs-progs won't
build at all on older distros. We can detect whether the compiler
supports -std=gnu90 and fall back to -std=gnu89 if it doesn't.
AX_CHECK_COMPILE_FLAG is the right way to do this, but it depends on
autoconf 2.64. AX_GCC_VERSION has been deprecated, so we'll use that
only for earlier autoconf versions so we can drop it when we drop
support for older autoconf releases.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'm4/ax_gcc_version.m4')
| -rw-r--r-- | m4/ax_gcc_version.m4 | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/m4/ax_gcc_version.m4 b/m4/ax_gcc_version.m4 new file mode 100644 index 00000000..63914d55 --- /dev/null +++ b/m4/ax_gcc_version.m4 @@ -0,0 +1,37 @@ +dnl @synopsis AX_GCC_VERSION(MAJOR, MINOR, PATCHLEVEL, [ACTION-SUCCESS], [ACTION-FAILURE]) +dnl @summary check wither gcc is at least version MAJOR.MINOR.PATCHLEVEL +dnl @category InstalledPackages +dnl +dnl Check whether we are using gcc and, if so, whether its version +dnl is at least MAJOR.MINOR.PATCHLEVEL +dnl +dnl ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on +dnl success/failure. +dnl +dnl @version 2005-05-30 +dnl @license GPLWithACException +dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Matteo Frigo. +AC_DEFUN([AX_GCC_VERSION], +[ +AC_REQUIRE([AC_PROG_CC]) +AC_CACHE_CHECK(whether we are using gcc $1.$2.$3 or later, ax_cv_gcc_$1_$2_$3, +[ +ax_cv_gcc_$1_$2_$3=no +if test "$GCC" = "yes"; then +dnl The semicolon after "yes" below is to pacify NeXT's syntax-checking cpp. +AC_EGREP_CPP(yes, [ +#ifdef __GNUC__ +# if (__GNUC__ > $1) || (__GNUC__ == $1 && __GNUC_MINOR__ > $2) \ + || (__GNUC__ == $1 && __GNUC_MINOR__ == $2 && __GNUC_PATCHLEVEL__ >= $3) + yes; +# endif +#endif +], [ax_cv_gcc_$1_$2_$3=yes]) +fi +]) +if test "$ax_cv_gcc_$1_$2_$3" = yes; then + m4_default([$4], :) +else + m4_default([$5], :) +fi +]) |