[PATCH] Pass -mglobal-merge as a module flag metadata.

[Akira Hatanaka]

How about the following case:

$ clang foo1.c -S -arch arm64 -o foo1.ll -O3
$ clang foo2.c -S -arch arm64 -o foo2.ll -mno-global-merge

foo1.ll would get "Enable Global Merge"="true" while foo2.ll would get "Enable Global Merge"="false" and linking the two modules would be an error. Should the linker emit a linked module with "Enable Global Merge"="false" without any errors in this case?

My question is, if -mno-global-merge/-mglobal-merge is provided on the command line, does it mean global-merge pass should be disabled or enabled regardless of what the optimization level is?


http://reviews.llvm.org/D7968

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