Hongtao Yu 9bce9489e7 [LLD][ThinLTO] Add --thinlto-single-module to allow compiling partial modules. ... This change introduces an LLD switch --thinlto-single-module to allow compiling only a part of the input modules. This is specifically enables: 1. Fast investigating/debugging modules of interest without spending time on compiling unrelated modules. 2. Compiler debug dump with -mllvm -debug-only= for specific modules. It will be useful for large applications which has 1K+ input modules for thinLTO. The switch can be combined with `--lto-obj-path=` or `--lto-emit-asm` to obtain intermediate object files or assembly files. So far the module name matching is implemented as a fuzzy name lookup where the modules with name containing the switch value are compiled. E.g, Command: ld.lld main.o thin.a --thinlto-single-module=thin.a --lto-obj-path=single.o log: [ThinLTO] Selecting thin.a(thin1.o at 168) to compile [ThinLTO] Selecting thin.a(thin2.o at 228) to compile Command: ld.lld main.o thin.a --thinlto-single-module=thin1.o --lto-obj-path=single.o log: [ThinLTO] Selecting thin.a(thin1.o at 168) to compile Differential Revision: https://reviews.llvm.org/D80406		2020-06-10 15:32:30 -07:00
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Caching.cpp
CMakeLists.txt
LLVMBuild.txt
LTO.cpp
LTOBackend.cpp
LTOCodeGenerator.cpp
LTOModule.cpp
SummaryBasedOptimizations.cpp
ThinLTOCodeGenerator.cpp
UpdateCompilerUsed.cpp