The HAVE_SYS_SDT_H define succeeds when the file sys/sdt.h is found. It doesn't
use the target compiler for that check, like AC_CHECK_HEADER does. This patch
uses AC_COMPILE to check for the header and ensure that a dummy program succeeds
to build.
This is a different patch than the one proposed at
https://gcc.gnu.org/ml/gcc-patches/2012-12/msg01122.html
I think the conditional with the file check can be removed too, kept it for now.
Ok for the trunk?
Matthias
PR other/61257
* configure.ac: Build a test program before defining HAVE_SYS_SDT_H.
* configure: Regenerate.
Index: gcc/configure.ac
===================================================================
--- gcc/configure.ac (revision 210677)
+++ gcc/configure.ac (working copy)
@@ -4971,9 +4971,13 @@
AC_MSG_CHECKING(sys/sdt.h in the target C library)
have_sys_sdt_h=no
if test -f $target_header_dir/sys/sdt.h; then
- have_sys_sdt_h=yes
- AC_DEFINE(HAVE_SYS_SDT_H, 1,
- [Define if your target C library provides sys/sdt.h])
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/sdt.h>]],
+ [[DTRACE_PROBE(foo,bar); return 0;]])
+ ],[
+ have_sys_sdt_h=yes
+ AC_DEFINE(HAVE_SYS_SDT_H, 1,
+ [Define if your target C library provides sys/sdt.h])
+ ])
fi
AC_MSG_RESULT($have_sys_sdt_h)
