Duncan P. N. Exon Smith bb847bd59e Reapply "LTO: add API to set strategy for -internalize" ... Reapply r199191, reverted in r199197 because it carelessly broke Other/link-opts.ll. The problem was that calling createInternalizePass("main") would select createInternalizePass(bool("main")) instead of createInternalizePass(ArrayRef<const char *>("main")). This commit fixes the bug. The original commit message follows. Add API to LTOCodeGenerator to specify a strategy for the -internalize pass. This is a new attempt at Bill's change in r185882, which he reverted in r188029 due to problems with the gold linker. This puts the onus on the linker to decide whether (and what) to internalize. In particular, running internalize before outputting an object file may change a 'weak' symbol into an internal one, even though that symbol could be needed by an external object file --- e.g., with arclite. This patch enables three strategies: - LTO_INTERNALIZE_FULL: the default (and the old behaviour). - LTO_INTERNALIZE_NONE: skip -internalize. - LTO_INTERNALIZE_HIDDEN: only -internalize symbols with hidden visibility. LTO_INTERNALIZE_FULL should be used when linking an executable. Outputting an object file (e.g., via ld -r) is more complicated, and depends on whether hidden symbols should be internalized. E.g., for ld -r, LTO_INTERNALIZE_NONE can be used when -keep_private_externs, and LTO_INTERNALIZE_HIDDEN can be used otherwise. However, LTO_INTERNALIZE_FULL is inappropriate, since the output object file will eventually need to link with others. lto_codegen_set_internalize_strategy() sets the strategy for subsequent calls to lto_codegen_write_merged_modules() and lto_codegen_compile*(). <rdar://problem/14334895> llvm-svn: 199244		2014-01-14 18:52:17 +00:00
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CMakeLists.txt
LLVMBuild.txt	Prune redundant dependencies in LLVMBuild.txt.	2013-12-11 00:30:57 +00:00
LTOCodeGenerator.cpp	Reapply "LTO: add API to set strategy for -internalize"	2014-01-14 18:52:17 +00:00
LTOModule.cpp	Update getLazyBitcodeModule to use ErrorOr for error handling.	2014-01-13 18:31:04 +00:00
Makefile	Test commit. Fixed a copy-paste error in the Makefile for lib/LTO.	2013-10-03 18:05:12 +00:00