[PATCH] D16135: Macro Debug Info support in Clang

[Amjad Aboud via Phabricator via cfe-commits]

aaboud added a comment.

> How are you measuring the build time? Total time for, say "ninja clang" with full parallelism? That'd be hard to measure the actual impact (since it could be the link time or other things are dominating, etc). If you have a reliable way to time (I'm assuming Intel has lots of tools for measuring compiler performance) the compilation, get a sense of the variance, etc (& link time, to get a sense of how much the larger inputs affect linker performance) would be useful.

I did a manual measurement, but I believe it is representative.
I used "time" tool to measure the whole time of the build (compile + link).

- time make -j8

Also, notice that I limited the targets to X86 only, so it was not a full build of LLVM.

- -DLLVM_OPTIMIZED_TABLEGEN=ON -DLLVM_TARGETS_TO_BUILD="X86" -DCMAKE_CXX_FLAGS="-fstandalone-debug" -DCMAKE_C_FLAGS="-fstandalone-debug"

However, as I already said, it should answer the time change and size question fairly enough.

> Does GCC have a command line option for this that we could mirror?

GCC emits macro debug info when when build with -g3.


https://reviews.llvm.org/D16135