1.1 --- a/acinclude.m4	Tue Feb 24 11:47:41 2009 +0000
     1.2 +++ b/acinclude.m4	Wed Mar 30 21:51:54 2011 +1000
     1.3 @@ -18,6 +18,27 @@
     1.4     $2 ])
     1.5  ])
     1.6  
     1.7 +# AC_CHECK_FORCEINLINE([if-ok],[if-notok])
     1.8 +# Test if the compiler recognizes __attribute__((always_inline))
     1.9 +# -----------------------
    1.10 +AC_DEFUN([AC_CHECK_FORCEINLINE], [
    1.11 +AC_MSG_CHECKING([support for force inlining]);
    1.12 +AC_COMPILE_IFELSE([
    1.13 +  AC_LANG_SOURCE([[
    1.14 +static int __attribute__((always_inline)) foo(int a, int b) { return a+b; }
    1.15 +
    1.16 +int main(int argc, char *argv[])
    1.17 +{
    1.18 +   return foo( 1, 2 ) == 3 ? 0 : 1;
    1.19 +}]])], [ 
    1.20 +   FORCEINLINE="__attribute__((always_inline))"
    1.21 +   AC_MSG_RESULT([$FORCEINLINE])
    1.22 +   $1 ], [ 
    1.23 +   FORCEINLINE=""
    1.24 +   AC_MSG_RESULT([no])
    1.25 +   $2 ])
    1.26 +])
    1.27 +
    1.28  # AC_CHECK_FRAME_ADDRESS([if-ok],[if-notok])
    1.29  # Test if the compiler will let us modify the return address on the stack
    1.30  # via __builtin_frame_address()