lxdream.org :: lxdream/acinclude.m4 r923:13ac59a786f4

filename	acinclude.m4
changeset	923:13ac59a786f4
next	927:17b6b9e245d8
author	nkeynes
date	Thu Dec 11 23:28:50 2008 +0000 (11 years ago)
permissions	-rw-r--r--
last change	Make HAVE_FASTCALL dependent on whether the compiler supports the attribute, rather than on whether we're making an optimized build - in any case there's no good reason to disable it for debug builds.

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     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/acinclude.m4	Thu Dec 11 23:28:50 2008 +0000
     1.3 @@ -0,0 +1,20 @@
     1.4 +# AC_CHECK_FASTCALL([if-ok],[if-notok])
     1.5 +# Test if the compiler recognizes __attribute__((regparm(3))) - we don't 
     1.6 +# currently check if it actually works correctly, but probably should...
     1.7 +# -----------------------
     1.8 +AC_DEFUN([AC_CHECK_FASTCALL], [
     1.9 +AC_MSG_CHECKING([support for fastcall calling conventions]);
    1.10 +AC_RUN_IFELSE([
    1.11 +  AC_LANG_SOURCE([[
    1.12 +int __attribute__((regparm(3))) foo(int a, int b) { return a+b; }
    1.13 +
    1.14 +int main(int argc, char *argv[])
    1.15 +{
    1.16 +   return foo( 1, 2 ) == 3 ? 0 : 1;
    1.17 +}]])], [ 
    1.18 +   AC_MSG_RESULT([yes])
    1.19 +   $1 ], [ 
    1.20 +   AC_MSG_RESULT([no])
    1.21 +   $2 ])
    1.22 +])
    1.23 +