[cfe-dev] Should clang support more gcc options?

[Zhongxing Xu]

I wish to test clang by compiling some packages with the following commands:

./configure
make CC=clang CFLAGS=-fsyntax-only

But it turns out that clang does not accept a lot of gcc options, such as
-c, -O, etc.
Shall we make clang just accept them as dumb options to make it a drop-in
replacement for gcc? This can facilitate the testing of clang a lot.
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