* tracebak.c (i386): Use GCC unwinder on Linux with GCC > 4.5.

From-SVN: r163352

diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index f0f418da01506ff0a33dcd5bdc4a6750fbb8ed7a..41a91f2033edfa8099383b4b06eb326fdb9a3c07 100644 (file)
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,7 @@
+2010-08-18  Eric Botcazou  <ebotcazou@adacore.com>
+
+       * tracebak.c (i386): Use GCC unwinder on Linux with GCC > 4.5.
+
 2010-08-10  Robert Dewar  <dewar@adacore.com>
 
        * sem_ch8.adb, sem_ch8.ads: Change name Write_Scopes to ws.

diff --git a/gcc/ada/tracebak.c b/gcc/ada/tracebak.c
index 9e5366a78ccf9bda3aa8a0ca5aadbba23a74685f..cd9693969c17ff72b938133a3e822d2dc5049f6c 100644 (file)
--- a/gcc/ada/tracebak.c
+++ b/gcc/ada/tracebak.c
@@ -303,7 +303,14 @@ struct layout
 #define IS_BAD_PTR(ptr) 0
 #endif
 
+/* Starting with GCC 4.6, -fomit-frame-pointer is turned on by default for
+   32-bit x86/Linux as well and DWARF 2 unwind tables are emitted instead.
+   See the x86-64 case below for the drawbacks with this approach.  */
+#if defined (linux) && (__GNUC__ * 10 + __GNUC_MINOR__ > 45)
+#define USE_GCC_UNWINDER
+#else
 #define USE_GENERIC_UNWINDER
+#endif
 
 struct layout
 {