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efl: use compile-time chec for type of va_list 

Using AC_TRY_RUN is bad for crosscompiling since you can't run the
binary you compiled (if you are not using a canadian crosstoolchain).
In this case the check is omitted and HAVE_VA_LIST_AS_ARRAY remains
undefined, which is wrong if you are compiling in a x86_64 for an ARM
architecture.



SVN revision: 82000
This commit is contained in:
Lucas De Marchi 2013-01-02 15:16:32 +00:00
parent a34941c17f
commit 1282bb2754
1 changed files with 21 additions and 30 deletions
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51
m4/ac_valist.m4
View File

@ -1,45 +1,36 @@
dnl That code is public domain and can be freely used or copied.
dnl Originally snatched from somewhere...
dnl Copyright (C) 2013 ProFUSION embedded systems
dnl This code is public domain and can be freely used or copied.
dnl Macro for checking if va_list is an array
dnl Usage: AC_C_VA_LIST_AS_ARRAY
dnl call AC_DEFINE for HAVE_VA_LIST_AS_ARRAY
dnl if for this architecture va_list is defined as an array
dnl call AC_DEFINE for HAVE_VA_LIST_AS_ARRAY if for this architecture
dnl va_list is defined as an array
AC_DEFUN([AC_C_VA_LIST_AS_ARRAY],
[
AC_MSG_CHECKING([whether va_list is defined as an array])
AC_CACHE_VAL([ac_cv_valistasarray],
[AC_TRY_RUN(
[
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[
#include <stdlib.h>
#include <stdarg.h>
void foo(int i, ...)
{
va_list ap1, ap2;
va_start(ap1, i);
ap2 = ap1;
if (va_arg(ap2, int) != 123 || va_arg(ap1, int) != 123)
exit(1);
va_end(ap1);
}
int main(void)
{
foo(0, 123);
return(0);
}
],
[ac_cv_valistasarray="no"],
[ac_cv_valistasarray="yes"],
[ac_cv_valistasarray="no"]
)])
AC_MSG_RESULT($ac_cv_valistasarray)
#define BUILD_ASSERT(cond) \
do { (void) sizeof(char [1 - 2*!(cond)]); } while(0)
]],
[[
va_list ap;
BUILD_ASSERT(__builtin_types_compatible_p(typeof(ap),
typeof(&(ap)[0])));
return 0;
]])],
[have_va_list_as_array="no"],
[have_va_list_as_array="yes"])
if test "x${ac_cv_valistasarray}" = "xyes" ; then
AC_MSG_RESULT([${have_va_list_as_array}])
if test "x${have_va_list_as_array}" = "xyes" ; then
AC_DEFINE([HAVE_VA_LIST_AS_ARRAY], [1], [Define to 1 if va_list is an array])
fi