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| author | Tsukasa OI <li@livegrid.org> | 2014-08-25 12:31:27 +0900 |
|---|---|---|
| committer | Peter Simons <simons@cryp.to> | 2014-10-15 11:07:25 +0200 |
| commit | 570de782487f3f01a8f9eae48891509e01d288bc (patch) | |
| tree | baf681b3f132f41c04b1600490db3a6efeea69be /m4/ax_gcc_archflag.m4 | |
| parent | 7354d36876d85610b456150f7c1f87aba34463a3 (diff) | |
| download | autoconf-archive-570de782487f3f01a8f9eae48891509e01d288bc.tar.gz | |
AX_GCC_ARCHFLAG: add workaround for Clang
LLVM Clang does not fail if -mcpu=UNKNOWN or -mtune=UNKNOWN is
specified. This will result in "no CPU tuning".
This commit resolves the issue by adding workaround for Clang.
Diffstat (limited to 'm4/ax_gcc_archflag.m4')
| -rw-r--r-- | m4/ax_gcc_archflag.m4 | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/m4/ax_gcc_archflag.m4 b/m4/ax_gcc_archflag.m4 index f8f892e..0d0bf43 100644 --- a/m4/ax_gcc_archflag.m4 +++ b/m4/ax_gcc_archflag.m4 @@ -64,12 +64,13 @@ # modified version of the Autoconf Macro, you may extend this special # exception to the GPL to apply to your modified version as well. -#serial 16 +#serial 17 AC_DEFUN([AX_GCC_ARCHFLAG], [AC_REQUIRE([AC_PROG_CC]) AC_REQUIRE([AC_CANONICAL_HOST]) AC_REQUIRE([AC_PROG_SED]) +AC_REQUIRE([AX_COMPILER_VENDOR]) AC_ARG_WITH(gcc-arch, [AS_HELP_STRING([--with-gcc-arch=<arch>], [use architecture <arch> for gcc -march/-mtune, instead of guessing])], ax_gcc_arch=$withval, ax_gcc_arch=yes) @@ -207,6 +208,7 @@ fi # guess arch if test "x$ax_gcc_arch" != x -a "x$ax_gcc_arch" != xno; then if test "x[]m4_default([$1],yes)" = xyes; then # if we require portable code flag_prefixes="-mtune=" + if test "x$ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor" = xclang; then flag_prefixes="-march="; fi # -mcpu=$arch and m$arch generate nonportable code on every arch except # x86. And some other arches (e.g. Alpha) don't accept -mtune. Grrr. case $host_cpu in i*86|x86_64*|amd64*) flag_prefixes="$flag_prefixes -mcpu= -m";; esac @@ -216,7 +218,11 @@ fi for flag_prefix in $flag_prefixes; do for arch in $ax_gcc_arch; do flag="$flag_prefix$arch" - AX_CHECK_COMPILE_FLAG($flag, [ax_cv_gcc_archflag=$flag; break]) + AX_CHECK_COMPILE_FLAG($flag, [if test "x$ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor" = xclang; then + if test "x[]m4_default([$1],yes)" = xyes; then + if test "x$flag" = "x-march=$arch"; then flag=-mtune=$arch; fi + fi + fi; ax_cv_gcc_archflag=$flag; break]) done test "x$ax_cv_gcc_archflag" = xunknown || break done |