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From: "markus at trippelsdorf dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/55551] Revision 193999 breaks lto/profiledbootstrap
Date: Sat, 01 Dec 2012 06:51:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55551

--- Comment #4 from Markus Trippelsdorf <markus at trippelsdorf dot de> 2012-12-01 06:51:14 UTC ---
With your patch applied, Firefox fails to build:

/var/tmp/moz-build-dir/_virtualenv/bin/python
/var/tmp/mozilla-central/config/pythonpath.py -I../../../config
/var/tmp/mozilla-central/config/expandlibs_exec.py --depend
.deps/libsoundtouch.so.pp --target libsoundtouch.so --uselist --  c++ 
-pedantic -Wall -Wpointer-arith -Woverloaded-virtual -Werror=return-type
-Wtype-limits -Wempty-body -Wno-ctor-dtor-privacy -Wno-overlength-strings
-Wno-invalid-offsetof -Wno-variadic-macros -Wcast-align -Wno-long-long -w
-march=native -fno-exceptions -fno-strict-aliasing -fno-rtti
-ffunction-sections -fdata-sections -fno-exceptions -std=gnu++0x -pthread -pipe
 -DNDEBUG -DTRIMMED -flto=4 -fno-fat-lto-objects -fprofile-use
-fprofile-correction -Wcoverage-mismatch -O3 -fomit-frame-pointer -fPIC -shared
-Wl,-z,defs -Wl,--gc-sections -Wl,-h,libsoundtouch.so -o libsoundtouch.so 
AAFilter.o cpu_detect_x86.o FIFOSampleBuffer.o FIRFilter.o RateTransposer.o
SoundTouch.o TDStretch.o sse_optimized.o    -lpthread -fuse-linker-plugin
-Wl,-O1,--hash-style=gnu -Wl,-z,noexecstack -Wl,--icf=safe  -fprofile-use
-Wl,-rpath-link,/var/tmp/moz-build-dir/dist/bin -Wl,-rpath-link,/usr/lib   
../../../dist/lib/libmozalloc.a  -ldl    
lto1: internal compiler error: in merge_profile_summaries, at lto-cgraph.c:1356

I will try to reduce this later.