Fix lookup of separate debug file on MS-Windows.

[deliverable/binutils-gdb.git] / gdb / common / common-defs.h

diff --git a/gdb/common/common-defs.h b/gdb/common/common-defs.h
index eb0ec214926c1ef2983adfe14f7b5deb8ec0012a..6b1f004ab1bd97f4fdbc4e3814e4a4d89c382f7b 100644 (file)
--- a/gdb/common/common-defs.h
+++ b/gdb/common/common-defs.h
@@ -1,6 +1,6 @@
 /* Common definitions.
 
-   Copyright (C) 1986-2018 Free Software Foundation, Inc.
+   Copyright (C) 1986-2019 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -17,8 +17,8 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#ifndef COMMON_DEFS_H
-#define COMMON_DEFS_H
+#ifndef COMMON_COMMON_DEFS_H
+#define COMMON_COMMON_DEFS_H
 
 #include "config.h"
 
@@ -59,6 +59,19 @@
 #define __STDC_LIMIT_MACROS 1
 #define __STDC_FORMAT_MACROS 1
 
+/* Some distros enable _FORTIFY_SOURCE by default, which on occasion
+   has caused build failures with -Wunused-result when a patch is
+   developed on a distro that does not enable _FORTIFY_SOURCE.  We
+   enable it here in order to try to catch these problems earlier;
+   plus this seems like a reasonable safety measure.  The check for
+   optimization is required because _FORTIFY_SOURCE only works when
+   optimization is enabled.  If _FORTIFY_SOURCE is already defined,
+   then we don't do anything.  */
+
+#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__ > 0
+#define _FORTIFY_SOURCE 2
+#endif
+
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -80,6 +93,12 @@
 #undef ATTRIBUTE_PRINTF
 #define ATTRIBUTE_PRINTF _GL_ATTRIBUTE_FORMAT_PRINTF
 
+#if GCC_VERSION >= 3004
+#define ATTRIBUTE_UNUSED_RESULT __attribute__ ((__warn_unused_result__))
+#else
+#define ATTRIBUTE_UNUSED_RESULT
+#endif
+
 #include "libiberty.h"
 #include "pathmax.h"
 #include "gdb/signals.h"
@@ -105,4 +124,13 @@
 /* String containing the current directory (what getwd would return).  */
 extern char *current_directory;
 
-#endif /* COMMON_DEFS_H */
+/* sbrk on macOS is not useful for our purposes, since sbrk(0) always
+   returns the same value.  brk/sbrk on macOS is just an emulation
+   that always returns a pointer to a 4MB section reserved for
+   that.  */
+
+#if defined (HAVE_SBRK) && !__APPLE__
+#define HAVE_USEFUL_SBRK 1
+#endif
+
+#endif /* COMMON_COMMON_DEFS_H */