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[LLVMgold.so] -plugin-opt=save-temps: save combined module to .lto.o …
…instead of .o This matches LLD and fixes https://sourceware.org/bugzilla/show_bug.cgi?id=26262#c1 .o is a bad choice for save-temps output because it is easy to override the bitcode file (*.o) ``` # Use bfd for the example, -fuse-ld=gold is similar. clang -flto -c a.c # generate bitcode file a.o clang -fuse-ld=bfd -flto a.o -o a -Wl,-plugin-opt=save-temps # override a.o # The user repeats the command but get surprised, because a.o is now a combined module. clang -fuse-ld=bfd -flto a.o -o a -Wl,-plugin-opt=save-temps ``` Reviewed By: tejohnson Differential Revision: https://reviews.llvm.org/D84132
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