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gcc: backport patch for gcc bug 61144

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This fixes gcc bug 6144, which in my case exhibited itself as a kernel
module that failed to load. This was because static platform_data
structures were being corrupted with the optimiser being set to any
value other than -O0.

Originally-submitted-by: Peter Urbanec <openembedded-devel@urbanec.net>

(From OE-Core rev: 365221f7285c0e392f573deaab3b1e00b12bc293)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Saul Wold
2014-10-10 23:46:16 -07:00
committed by Richard Purdie
parent c0b0f695f5
commit 0fb3552632
2 changed files with 32 additions and 0 deletions
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1
meta/recipes-devtools/gcc/gcc-4.9.inc
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@@ -70,6 +70,7 @@ SRC_URI = "\
file://0053-gcc-fix-segfault-from-calling-free-on-non-malloc-d-a.patch \
file://0054-gcc-Makefile.in-fix-parallel-building-failure.patch \
file://0055-PR-rtl-optimization-61801.patch \
file://0056-top-level-reorder_gcc-bug-61144.patch \
"
SRC_URI[md5sum] = "fddf71348546af523353bd43d34919c1"
SRC_URI[sha256sum] = "d334781a124ada6f38e63b545e2a3b8c2183049515a1abab6d513f109f1d717e"

31
meta/recipes-devtools/gcc/gcc-4.9/0056-top-level-reorder_gcc-bug-61144.patch Normal file
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@@ -0,0 +1,31 @@
Upstream-Status: Backport
Originally-submitted-by: Peter Urbanec <openembedded-devel@urbanec.net>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-4.9/0056-top-level-reorder_gcc-bug-61144.patch
@@ -0,0 +1,21 @@
+--- a/gcc/varpool.c 2014/10/05 02:50:01 215895
++++ b/gcc/varpool.c 2014/10/05 04:52:19 215896
+@@ -329,8 +329,16 @@
+
+ /* Variables declared 'const' without an initializer
+ have zero as the initializer if they may not be
+- overridden at link or run time. */
+- if (!DECL_INITIAL (real_decl)
++ overridden at link or run time.
++
++ It is actually requirement for C++ compiler to optimize const variables
++ consistently. As a GNU extension, do not enfore this rule for user defined
++ weak variables, so we support interposition on:
++ static const int dummy = 0;
++ extern const int foo __attribute__((__weak__, __alias__("dummy")));
++ */
++ if ((!DECL_INITIAL (real_decl)
++ || (DECL_WEAK (decl) && !DECL_COMDAT (decl)))
+ && (DECL_EXTERNAL (decl) || decl_replaceable_p (decl)))
+ return error_mark_node;
+