* posix.c (O_BINARY): Define if not defined.

	(backtrace_open): Pass O_BINARY to open.  Only call fcntl if
	HAVE_FCNTL is defined.
	* configure.ac: Test for the fcntl function.
	* configure, config.h.in: Rebuild.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@191443 138bc75d-0d04-0410-961f-82ee72b054a4

5 files changed, 53 insertions, 1 deletions

diff --git a/libbacktrace/ChangeLog b/libbacktrace/ChangeLog
index e7c3bcaa15b..15a94391a1e 100644
--- a/libbacktrace/ChangeLog
+++ b/libbacktrace/ChangeLog
@@ -1,5 +1,13 @@
 2012-09-18  Ian Lance Taylor  <iant@google.com>
 
+	* posix.c (O_BINARY): Define if not defined.
+	(backtrace_open): Pass O_BINARY to open.  Only call fcntl if
+	HAVE_FCNTL is defined.
+	* configure.ac: Test for the fcntl function.
+	* configure, config.h.in: Rebuild.
+
+2012-09-18  Ian Lance Taylor  <iant@google.com>
+
 	* btest.c (test1, test2, test3, test4): Add the unused attribute.
 
 2012-09-18  Ian Lance Taylor  <iant@google.com>
diff --git a/libbacktrace/config.h.in b/libbacktrace/config.h.in
index 6a31c53d028..090e8d86bc3 100644
--- a/libbacktrace/config.h.in
+++ b/libbacktrace/config.h.in
@@ -10,6 +10,9 @@
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
+/* Define to 1 if you have the fcntl function */
+#undef HAVE_FCNTL
+
 /* Define if _Unwind_GetIPInfo is available. */
 #undef HAVE_GETIPINFO
 
diff --git a/libbacktrace/configure b/libbacktrace/configure
index 518e99e0014..70ac451e0a4 100755
--- a/libbacktrace/configure
+++ b/libbacktrace/configure
@@ -11713,6 +11713,27 @@ if test "$ALLOC_FILE" = "alloc.lo"; then
 fi
 
 
+# Check for the fcntl function.
+if test -n "${with_target_subdir}"; then
+   case "${host}" in
+   *-*-mingw*) have_fcntl=no ;;
+   *) have_fcntl=yes ;;
+   esac
+else
+  ac_fn_c_check_func "$LINENO" "fcntl" "ac_cv_func_fcntl"
+if test "x$ac_cv_func_fcntl" = x""yes; then :
+  have_fcntl=yes
+else
+  have_fcntl=no
+fi
+
+fi
+if test "$have_fcntl" = "yes"; then
+
+$as_echo "#define HAVE_FCNTL 1" >>confdefs.h
+
+fi
+
 ac_fn_c_check_decl "$LINENO" "strnlen" "ac_cv_have_decl_strnlen" "$ac_includes_default"
 if test "x$ac_cv_have_decl_strnlen" = x""yes; then :
   ac_have_decl=1
diff --git a/libbacktrace/configure.ac b/libbacktrace/configure.ac
index 495e23e5c68..250423d1943 100644
--- a/libbacktrace/configure.ac
+++ b/libbacktrace/configure.ac
@@ -201,6 +201,20 @@ if test "$ALLOC_FILE" = "alloc.lo"; then
 fi
 AC_SUBST(BACKTRACE_USES_MALLOC)
 
+# Check for the fcntl function.
+if test -n "${with_target_subdir}"; then
+   case "${host}" in
+   *-*-mingw*) have_fcntl=no ;;
+   *) have_fcntl=yes ;;
+   esac
+else
+  AC_CHECK_FUNC(fcntl, [have_fcntl=yes], [have_fcntl=no])
+fi
+if test "$have_fcntl" = "yes"; then
+  AC_DEFINE([HAVE_FCNTL], 1,
+	    [Define to 1 if you have the fcntl function])
+fi
+
 AC_CHECK_DECLS(strnlen)
 
 AC_CACHE_CHECK([whether tests can run],
diff --git a/libbacktrace/posix.c b/libbacktrace/posix.c
index 0b76f1e94a1..01afc42b08e 100644
--- a/libbacktrace/posix.c
+++ b/libbacktrace/posix.c
@@ -41,6 +41,10 @@ POSSIBILITY OF SUCH DAMAGE.  */
 #include "backtrace.h"
 #include "internal.h"
 
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #ifndef O_CLOEXEC
 #define O_CLOEXEC 0
 #endif
@@ -57,18 +61,20 @@ backtrace_open (const char *filename, backtrace_error_callback error_callback,
 {
   int descriptor;
 
-  descriptor = open (filename, O_RDONLY | O_CLOEXEC);
+  descriptor = open (filename, O_RDONLY | O_BINARY | O_CLOEXEC);
   if (descriptor < 0)
     {
       error_callback (data, filename, errno);
       return -1;
     }
 
+#ifdef HAVE_FCNTL
   /* Set FD_CLOEXEC just in case the kernel does not support
      O_CLOEXEC. It doesn't matter if this fails for some reason.
      FIXME: At some point it should be safe to only do this if
      O_CLOEXEC == 0.  */
   fcntl (descriptor, F_SETFD, FD_CLOEXEC);
+#endif
 
   return descriptor;
 }