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2005-08-13 Yoshinori K. Okuji <okuji@enbug.org>

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* aclocal.m4 (grub_I386_CHECK_REGPARM_BUG): Replace the test
        program with another one, because the old one didn't detect a bug
        in gcc-3.4. Always use regparm 2, because the new test is still
        not enough for gcc-4.0. Someone must investigate a simple test
        case which detects a bug in gcc-4.0.
This commit is contained in:
okuji 2005-08-13 18:44:14 +00:00
parent 9119672c5f
commit e9c6f39bb4
3 changed files with 162 additions and 81 deletions
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38
aclocal.m4 vendored
View file

@ -300,24 +300,34 @@ AC_DEFUN(grub_I386_CHECK_REGPARM_BUG,
AC_MSG_CHECKING([if GCC has the regparm=3 bug])
AC_CACHE_VAL(grub_cv_i386_check_nested_functions,
[AC_RUN_IFELSE([AC_LANG_SOURCE(
[[int *p;
[[
static int
test (int *n)
{
return *n == -1;
}
static int
testfunc (int __attribute__ ((__regparm__ (3))) (*hook) (int a, int b, int *c))
{
int a = 0;
int b = 0;
int c = -1;
return hook (a, b, &c);
}
int
main ()
main (void)
{
int test;
int __attribute__ ((__regparm__ (3))) nestedfunc (int a, int b, int c)
int __attribute__ ((__regparm__ (3))) nestedfunc (int a, int b, int *c)
{
return (&test == p);
return a == b && test (c);
}
p = &test;
return ! nestedfunc (0, 0, 0);
return testfunc (nestedfunc) ? 0 : 1;
}
]])],
[grub_cv_i386_check_nested_functions=yes],
[grub_cv_i386_check_nested_functions=no])])
[grub_cv_i386_check_nested_functions=no],
[grub_cv_i386_check_nested_functions=yes])])
AC_MSG_RESULT([$grub_cv_i386_check_nested_functions])
@ -326,6 +336,10 @@ if test "x$grub_cv_i386_check_nested_functions" = xyes; then
[__attribute__ ((__regparm__ (2)))],
[Catch gcc bug])
else
AC_DEFINE([NESTED_FUNC_ATTR], [], [Catch gcc bug])
dnl Unfortunately, the above test does not detect a bug in gcc-4.0.
dnl So use regparm 2 until a better test is found.
AC_DEFINE([NESTED_FUNC_ATTR],
[__attribute__ ((__regparm__ (2)))],
[Catch gcc bug])
fi
])