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LLVM backend for 6502
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83533dd617
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Duncan P. N. Exon Smith 83533dd617 LTO: Check local linkage first 
Since visibility is meaningless for symbols with local linkage, check
local linkage before visibility when setting symbol attributes.

When linkage is `internal` and the visibility is `hidden`, the exposed
attribute is now `LTO_SYMBOL_SCOPE_INTERNAL` instead of
`LTO_SYMBOL_SCOPE_HIDDEN`.  Although the bitfield allows *both* to be
specified, the combination is nonsense anyway.

Given changes (in progress) to drop visibility when a symbol has local
linkage, this almost has no functionality change: it's mostly a cleanup
to clarify the logic.

The exception is when something has `appending` linkage.  Before this
change, such symbols would be advertised as `LTO_SYMBOL_SCOPE_INTERNAL`;
now, they'll be given `LTO_SYMBOL_SCOPE_COMMON`.

Unfortunately this is really awkward to test.  This only changes what we
advertise to linkers (before running LTO), not what the final object
looks like.  In theory I could add `DEBUG` output to `llvm-lto` (and
test with "REQUIRES: asserts"), but follow-up commits to disallow
`internal hidden` simplify this anyway.

<rdar://problem/16141113>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208261 91177308-0d34-0410-b5e6-96231b3b80d8
2014-05-07 22:53:14 +00:00
autoconf ARM64: initial backend import 2014-03-29 10:18:08 +00:00
bindings [OCaml] Add an ocamlfind package llvm.all_backends. 2014-05-01 21:00:52 +00:00
cmake Disable -Wcomment when building with GCC. 2014-05-06 09:46:06 +00:00
docs [tablegen] Add !listconcat operator with the similar semantics as !strconcat 2014-05-07 10:13:19 +00:00
examples Try to fix the msvc build. 2014-04-29 23:37:02 +00:00
include llvm-cov: Fix some funny indentation (NFC) 2014-05-07 21:50:43 +00:00
lib LTO: Check local linkage first 2014-05-07 22:53:14 +00:00
projects
test [X86] Add a test case for r208252. 2014-05-07 22:52:58 +00:00
tools Remove the UseCFI option from createAsmStreamer. 2014-05-07 13:00:43 +00:00
unittests Replace a virtual with an override. 2014-05-07 19:52:32 +00:00
utils Debug.h already includes raw_ostream.h, no need to include it again. 2014-05-07 18:19:04 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format
.gitignore
CMakeLists.txt [CMake] Add build rules for llvm-PerfectShuffle utility 2014-05-07 16:54:00 +00:00
CODE_OWNERS.TXT ARM Linux support 2014-04-02 23:03:28 +00:00
configure ARM64: initial backend import 2014-03-29 10:18:08 +00:00
CREDITS.TXT Test commit. 2014-04-10 22:25:51 +00:00
LICENSE.TXT
llvm.spec.in
LLVMBuild.txt
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in
Makefile.rules [Build] Add rule to generate fully-expanded .td file 2014-05-06 03:49:45 +00:00
README.txt Trivial test commit. 2014-04-26 19:05:45 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

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LLVM is open source software. You may freely distribute it under the terms of
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Please see the documentation provided in docs/ for further
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If you're writing a package for LLVM, see docs/Packaging.rst for our
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