[MIPS] Use ia64 backtrace.c.

[MIPS] Use ia64 backtrace.c.

[Tom de Vries]

[-- Attachment #1: Type: text/plain, Size: 473 bytes --]

Hi,

currently for MIPS we use the default backtrace function defined in
glibc/debug/backtrace.c.

Attached patch for glibc-ports instead uses the backtrace function defined in
glibc/sysdeps/ia64/backtrace.c, just as is done for sh, x86_64, tile and alpha.

The ia64 backtrace.c uses libgcc's unwind_backtrace, which allows it to give a
backtrace even with -fomit-frame-pointer.

I tested the patch on MIPS qemu (mips-linux-gnu) with host i686-pc-linux-gnu.

Thanks,
- Tom

[-- Attachment #2: glibc-mips-backtrace-include-ia64.patch --]
[-- Type: text/x-patch, Size: 721 bytes --]

2011-12-20  Tom de Vries  <tom@codesourcery.com>

	* sysdeps/mips/backtrace.c: New file, including ia64 backtrace.c.
	* sysdeps/mips/Makefile: Compile backtrace.c with -funwind-tables.

diff --git a/sysdeps/mips/Makefile b/sysdeps/mips/Makefile
index 9d01522..b7e5e61 100644
--- a/sysdeps/mips/Makefile
+++ b/sysdeps/mips/Makefile
@@ -11,4 +11,8 @@ ifeq ($(subdir),rt)
 librt-sysdep_routines += rt-sysdep
 endif
 
+ifeq ($(subdir),debug)
+CFLAGS-backtrace.c += -funwind-tables
+endif
+
 ASFLAGS-.os += $(pic-ccflag)
diff --git a/sysdeps/mips/backtrace.c b/sysdeps/mips/backtrace.c
new file mode 100644
index 0000000..2970294
--- /dev/null
+++ b/sysdeps/mips/backtrace.c
@@ -0,0 +1 @@
+#include <sysdeps/ia64/backtrace.c>

Re: [MIPS] Use ia64 backtrace.c.

[Joseph S. Myers]

Thanks.  I've committed this patch.  Note that 
<http://sourceware.org/ml/libc-hacker/2011-12/msg00001.html> proposes 
moving ia64 from libc to ports, in which case other architectures will 
become the canonical home of all files from ia64 that are included by any 
other libc architecture - probably x86_64 will become canonical in this 
case (there's also wordexp.c, sigpending.c and sigprocmask.c).  (For 
backtrace.c it might actually be better for the ia64 version to replace 
the debug/backtrace.c version.)

-- 
Joseph S. Myers
joseph@codesourcery.com