filename | acinclude.m4 |
changeset | 927:17b6b9e245d8 |
prev | 923:13ac59a786f4 |
next | 964:f2f3c7612d06 |
author | nkeynes |
date | Wed Jan 14 23:27:57 2009 +0000 (15 years ago) |
permissions | -rw-r--r-- |
last change | Execute the mem_unprotect call only on 64-bit platforms (where it may be needed), since it seems to break on OS X 10.4 32-bit, at least |
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1 # AC_CHECK_FASTCALL([if-ok],[if-notok])
2 # Test if the compiler recognizes __attribute__((regparm(3))) - we don't
3 # currently check if it actually works correctly, but probably should...
4 # -----------------------
5 AC_DEFUN([AC_CHECK_FASTCALL], [
6 AC_MSG_CHECKING([support for fastcall calling conventions]);
7 AC_RUN_IFELSE([
8 AC_LANG_SOURCE([[
9 int __attribute__((regparm(3))) foo(int a, int b) { return a+b; }
11 int main(int argc, char *argv[])
12 {
13 return foo( 1, 2 ) == 3 ? 0 : 1;
14 }]])], [
15 AC_MSG_RESULT([yes])
16 $1 ], [
17 AC_MSG_RESULT([no])
18 $2 ])
19 ])
21 # AC_CHECK_FRAME_ADDRESS([if-ok],[if-notok])
22 # Test if the compiler will let us modify the return address on the stack
23 # via __builtin_frame_address()
24 # -----------------------
25 AC_DEFUN([AC_CHECK_FRAME_ADDRESS], [
26 AC_MSG_CHECKING([if we have a working __builtin_frame_address()]);
27 AC_RUN_IFELSE([
28 AC_LANG_SOURCE([[
29 void * __attribute__((noinline)) first_arg( void *x, void *y ) { return x; }
30 int __attribute__((noinline)) foo( int arg, void *exc )
31 {
32 if( arg < 2 ) {
33 *(((void **)__builtin_frame_address(0))+1) = exc;
34 }
35 return 0;
36 }
38 int main(int argc, char *argv[])
39 {
40 goto *first_arg(&&start, &&except);
42 start:
43 return foo( argc, &&except ) + 1;
45 except:
46 return 0;
47 }]])], [
48 AC_MSG_RESULT([yes])
49 $1 ], [
50 AC_MSG_RESULT([no])
51 $2 ])
52 ])
.