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Added gcc46-avoid-segfault.patch

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This GCC patch was needed in order to successfully build a
cross-compilation toolchain under buildroot on Ubuntu 14.04.

The patch is included in later GCC releases, so we probably can drop
this once we upgrade GCC.
This commit is contained in:
Daniel Gnoutcheff 2015-03-28 19:21:10 -04:00
parent 693002462d
commit 3d97f40858
2 changed files with 43 additions and 0 deletions
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42
buildroot-patches/gcc46-avoid-segfault.patch Normal file
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Avoid GCC 4.6 segfaults
Buildroot's attempt to build a GCC 4.6.x cross-compilation toolchain might fail
with something like
/some/path/buildroot-2013.02/output/toolchain/gcc-4.6.3/libgcc/../gcc/libgcc2.c: In function ‘__negdi2’:
/some/path/buildroot-2013.02/output/toolchain/gcc-4.6.3/libgcc/../gcc/libgcc2.c:72:1: internal compiler error: Segmentation fault
This patch is revision 191605 for GCC 4.7.x
(<https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=191605>). Applying it
to 4.6.x seems to prevent this crash.
Save this file as
buildroot-2013.02/toolchain/gcc/4.6.3/999-ira-int.patch
to have buildroot apply this patch to GCC 4.6.x source before trying to build
it.
See also <https://gcc.gnu.org/ml/gcc-help/2014-03/msg00049.html>
Index: buildroot-2013.02/toolchain/gcc/4.6.3/999-ira-int.patch
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ buildroot-2013.02/toolchain/gcc/4.6.3/999-ira-int.patch 2015-03-29 00:09:28.000000000 -0400
@@ -0,0 +1,18 @@
+--- gcc-4_7-branch/gcc/ira-int.h 2012/09/21 09:19:39 191604
++++ gcc-4_7-branch/gcc/ira-int.h 2012/09/21 10:08:35 191605
+@@ -1138,8 +1138,13 @@
+ ira_allocno_object_iter_cond (ira_allocno_object_iterator *i, ira_allocno_t a,
+ ira_object_t *o)
+ {
+- *o = ALLOCNO_OBJECT (a, i->n);
+- return i->n++ < ALLOCNO_NUM_OBJECTS (a);
++ int n = i->n++;
++ if (n < ALLOCNO_NUM_OBJECTS (a))
++ {
++ *o = ALLOCNO_OBJECT (a, n);
++ return true;
++ }
++ return false;
+ }
+
+ /* Loop over all objects associated with allocno A. In each

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gcc46-avoid-segfault.patch