diff options
Diffstat (limited to 'm4/attributes.m4')
| -rw-r--r-- | m4/attributes.m4 | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/m4/attributes.m4 b/m4/attributes.m4 index f781429f7..1f4750a71 100644 --- a/m4/attributes.m4 +++ b/m4/attributes.m4 @@ -380,3 +380,50 @@ AC_DEFUN([CC_ATTRIBUTE_MALLOC], [ ifelse([$2], , [:], [$2]) fi ]) + + +dnl AC_C_ALWAYS_INLINE +dnl Define inline to something appropriate, including the new always_inline +dnl attribute from gcc 3.1 +dnl Thanks to Michel LESPINASSE <walken@zoy.org> +dnl __inline__ "check" added by Darren Salt +AC_DEFUN([AC_C_ALWAYS_INLINE], [ + AC_C_INLINE + if test x"$GCC" = x"yes" -a x"$ac_cv_c_inline" = x"inline"; then + AC_MSG_CHECKING([for always_inline]) + SAVE_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS -Wall -Werror" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[inline __attribute__ ((__always_inline__)) void f (void);]])], + [ac_cv_always_inline=yes],[ac_cv_always_inline=no]) + CFLAGS="$SAVE_CFLAGS" + AC_MSG_RESULT([$ac_cv_always_inline]) + if test x"$ac_cv_always_inline" = x"yes"; then + AH_TOP([ +#ifdef inline +/* the strange formatting below is needed to prevent config.status from rewriting it */ +# undef \ + inline +#endif + ]) + AC_DEFINE_UNQUOTED([inline],[inline __attribute__ ((__always_inline__))]) + fi + ac_cv_c___inline__='' + else + # FIXME: test the compiler to see if it supports __inline__ + # instead of assuming that if it isn't gcc, it doesn't + case "$ac_cv_c_inline" in + yes) + ac_cv_c___inline__=inline + ;; + inline|__inline__) + ac_cv_c___inline__='' + ;; + *) + ac_cv_c___inline__="$ac_cv_c_inline" + ;; + esac + fi + if test x"$ac_cv_c___inline__" != x; then + AC_DEFINE_UNQUOTED([__inline__],[$ac_cv_c___inline__],[Define if the compiler doesn't recognise __inline__]) + fi +]) |