diff options
| author | Ladislav Michl <ladis@linux-mips.org> | 2012-11-13 11:19:47 +0100 |
|---|---|---|
| committer | Arun Sharma <asharma@fb.com> | 2012-11-24 21:37:07 -0800 |
| commit | 10b064ffe902d5af31bb49bd8e4f03c545f8d462 (patch) | |
| tree | 63525af53a8dd5e93fb7bf41517f3b6f65f181a9 /configure.ac | |
| parent | ae3dd9417a3d178cf51ce744d85b695dbf025b44 (diff) | |
| download | libunwind-10b064ffe902d5af31bb49bd8e4f03c545f8d462.tar.gz | |
Support building with older compilers.
Add a check for __builtin_unreachable.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index cffe19b1..7d549aac 100644 --- a/configure.ac +++ b/configure.ac @@ -285,6 +285,17 @@ if test x$have__builtin___clear_cache = xyes; then fi AC_MSG_RESULT([$have__builtin___clear_cache]) +AC_MSG_CHECKING([for __builtin_unreachable]) +AC_LINK_IFELSE( + [AC_LANG_PROGRAM([[]], [[__builtin_unreachable()]])], + [have__builtin_unreachable=yes], + [have__builtin_unreachable=no]) +if test x$have__builtin_unreachable = xyes; then + AC_DEFINE([HAVE__BUILTIN_UNREACHABLE], [1], + [Defined if __builtin_unreachable() is available]) +fi +AC_MSG_RESULT([$have__builtin_unreachable]) + AC_MSG_CHECKING([for __sync atomics]) AC_LINK_IFELSE( [AC_LANG_PROGRAM([[]], [[ |