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David Blaikie e1c79749ca Disable the -gmlt optimization implemented in r218129 under Darwin due to issues with dsymutil. 
r218129 omits DW_TAG_subprograms which have no inlined subroutines when
emitting -gmlt data. This makes -gmlt very low cost for -O0 builds.

Darwin's dsymutil reasonably considers a CU empty if it has no
subprograms (which occurs with the above optimization in -O0 programs
without any force_inline function calls) and drops the line table, CU,
and everything in this situation, making backtraces impossible.

Until dsymutil is modified to account for this, disable this
optimization on Darwin to preserve the desired functionality.
(see r218545, which should be reverted after this patch, for other
discussion/details)

Footnote:
In the long term, it doesn't look like this scheme (of simplified debug
info to describe inlining to enable backtracing) is tenable, it is far
too size inefficient for optimized code (the DW_TAG_inlined_subprograms,
even once compressed, are nearly twice as large as the line table
itself (also compressed)) and we'll be considering things like Cary's
two level line table proposal to encode all this information directly in
the line table.

llvm-svn: 218702
 		2014-09-30 21:28:32 +00:00
..
Analysis AVX-512: added cost for some AVX-512 instructions 2014-09-16 07:57:37 +00:00
Assembler [inline asm] Add a check in InlineAsm::ConstraintInfo::Parse to make sure '{' 2014-09-05 22:30:32 +00:00
Bindings Extend C disassembler API to allow specifying target features 2014-09-30 16:31:40 +00:00
Bitcode Ensure bitcode encoding stays stable. 2014-09-23 08:48:01 +00:00
BugPoint llvm/test/BugPoint/compile-custom.ll: Use explicit %python to invoke a test script, compile-custom.ll.py, for shebang-incapable hosts. 2014-07-11 14:44:10 +00:00
CodeGen Recommit r218010 [FastISel][AArch64] Fold bit test and branch into TBZ and TBNZ. 2014-09-30 19:59:35 +00:00
DebugInfo Disable the -gmlt optimization implemented in r218129 under Darwin due to issues with dsymutil. 2014-09-30 21:28:32 +00:00
ExecutionEngine [MCJIT] Make sure we test ARM BR24 relocations with both internal and external 2014-09-11 22:43:36 +00:00
Feature [AArch64] Update test case to pass with post-RA MI scheduler. 2014-09-13 03:23:23 +00:00
FileCheck FileCheck: Add a flag to allow checking empty input 2014-08-07 18:40:37 +00:00
Instrumentation Introduce support for custom wrappers for vararg functions. 2014-09-30 12:33:16 +00:00
Integer
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JitListener
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LTO Try to fix i686-cygming bots. 2014-09-18 22:56:00 +00:00
Linker Merge alignment of common GlobalValue. 2014-09-09 17:48:18 +00:00
MC WinCOFFObjectWriter: optimize the string table for common suffices 2014-09-29 22:43:20 +00:00
Object Nuke MCAnalysis. 2014-09-02 22:32:20 +00:00
Other [lit] Parse all strings as UTF-8 rather than ASCII. 2014-09-12 16:46:05 +00:00
TableGen [AVX512] Added intrinsics for VPCMPEQB and VPCMPEQW. 2014-09-30 11:32:22 +00:00
Transforms [IndVarSimplify] Widen loop unsigned compares. 2014-09-30 03:17:42 +00:00
Unit Let test/Unit/lit.cfg add config.shlibdir to $PATH on DLL platforms like cygming. 2014-07-04 05:11:55 +00:00
Verifier Verifier: Don't reject varargs callee cleanup functions 2014-08-29 21:25:28 +00:00
YAMLParser
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tools Revert r218673 'llvm-cov: add test for report's function & file association.' 2014-09-30 14:48:12 +00:00
.clang-format
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CMakeLists.txt Add LLVMgold target to test dependencies. 2014-09-10 22:20:49 +00:00
Makefile Delete support for AuroraUX. 2014-08-14 15:15:09 +00:00
Makefile.tests
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TestRunner.sh
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lit.cfg pass environment when invoking llvm-config from lit.cfg 2014-09-24 18:37:48 +00:00
lit.site.cfg.in Add missing Interpreter intrinsic lowering for sin, cos and ceil 2014-08-08 15:00:12 +00:00