Only use O_CLOEXEC on platforms that support it

Change a9fca58 made use of the O_CLOEXEC flag, which is not supported on
older Linux kernels. This change makes the use contingent on kernel
support.

Testing: I manually compiled breakpad on CentOS 5.8 running kernel
2.6.18-308.8.2.el5.centos.plusxen.

Bug: 730
Change-Id: I21dff928cfba3c156a56708913f65a0c7b5396a6
Reviewed-on: https://chromium-review.googlesource.com/498528
Reviewed-by: Mike Frysinger <vapier@chromium.org>

1 files changed, 40 insertions, 0 deletions

diff --git a/configure b/configure
index dcfd3c76..5e94512c 100755
--- a/configure
+++ b/configure
@@ -7455,6 +7455,46 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
 
 
 
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for O_CLOEXEC defined in fcntl.h" >&5
+$as_echo_n "checking for O_CLOEXEC defined in fcntl.h... " >&6; }
+if ${ac_cv_defined_O_CLOEXEC_fcntl_h+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#include <fcntl.h>
+int
+main ()
+{
+
+  #ifdef O_CLOEXEC
+  int ok;
+  #else
+  choke me
+  #endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  ac_cv_defined_O_CLOEXEC_fcntl_h=yes
+else
+  ac_cv_defined_O_CLOEXEC_fcntl_h=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_defined_O_CLOEXEC_fcntl_h" >&5
+$as_echo "$ac_cv_defined_O_CLOEXEC_fcntl_h" >&6; }
+if test $ac_cv_defined_O_CLOEXEC_fcntl_h != "no"; then :
+
+else
+
+$as_echo "#define O_CLOEXEC 0" >>confdefs.h
+
+fi
+
 # Only build Linux client libs when compiling for Linux
 case $host in
   *-*-linux* | *-android* )