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Duncan P. N. Exon Smith f5d17528ee Module: Don't rename in getOrInsertFunction() 
During LTO, user-supplied definitions of C library functions often
exist.  -instcombine uses Module::getOrInsertFunction() to get a handle
on library functions (e.g., @puts, when optimizing @printf).

Previously, Module::getOrInsertFunction() would rename any matching
functions with local linkage, and create a new declaration.  In LTO,
this is the opposite of desired behaviour, as it skips by the
user-supplied version of the library function and creates a new
undefined reference which the linker often cannot resolve.

After some discussing with Rafael on the list, it looks like it's
undesired behaviour.  If a consumer actually *needs* this behaviour, we
should add new API with a more explicit name.

I added two testcases: one specifically for the -instcombine behaviour
and one for the LTO flow.

<rdar://problem/16165191>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203513 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-10 23:42:28 +00:00
autoconf Add a --enable-clang-plugin-support option to configure. 2014-03-10 16:58:35 +00:00
bindings [python-bindings] Remove some cruft that snuck in. 2014-02-23 04:43:26 +00:00
cmake [CMake] add_llvm_target(): No need to include TABLEGEN_OUTPUT in source list. 2014-03-04 17:05:28 +00:00
docs Docs: remove paragraph about manual account creation. 2014-03-10 19:24:30 +00:00
examples Fix warnings about an variable only used in asserts. 2014-03-06 06:35:46 +00:00
include Test commit: Remove trailing whitespace. 2014-03-10 22:24:07 +00:00
lib Module: Don't rename in getOrInsertFunction() 2014-03-10 23:42:28 +00:00
projects "Mac OS/X" -> "Mac OS X" spelling fixes for llvm. 2014-03-07 18:08:54 +00:00
test Module: Don't rename in getOrInsertFunction() 2014-03-10 23:42:28 +00:00
tools fix polly buildbot 2014-03-10 21:27:04 +00:00
unittests ADT/PointerIntPairTest.cpp: Appease msc17. 2014-03-10 02:33:17 +00:00
utils [lit] Bump dev version number. 2014-03-10 21:58:16 +00:00
.arcconfig
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.gitignore Added .DS_Store entry in .gitignore for ignoring .DS_Store files in the source 2014-01-25 15:15:16 +00:00
CMakeLists.txt fix PR13550: add a cmake WITH_POLLY option 2014-03-10 20:47:39 +00:00
CODE_OWNERS.TXT Add myself as owner for libc++ 2014-02-18 14:03:17 +00:00
configure Add a --enable-clang-plugin-support option to configure. 2014-03-10 16:58:35 +00:00
CREDITS.TXT Fix documentation typos 2013-12-20 00:33:39 +00:00
LICENSE.TXT Update the copyright credits -- Happy new year 2014! 2014-01-01 08:27:31 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile Provide CMake package modules in install tree 2014-02-09 16:37:02 +00:00
Makefile.common
Makefile.config.in Add a --enable-clang-plugin-support option to configure. 2014-03-10 16:58:35 +00:00
Makefile.rules "Mac OS/X" -> "Mac OS X" spelling fixes for llvm. 2014-03-07 18:08:54 +00:00
README.txt Revert "Test commit to check e-mail address. Please discard this." 2013-10-04 10:59:13 +00:00

README.txt 

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