[cfe-dev] Clang + ccache == different warnings?
Larry Gritz
lg at larrygritz.com
Fri Jun 1 12:08:42 PDT 2012
After compiling my apps with clang 3.1, and fixing all the new warnings it found that gcc did not care about, I wanted to get clang + ccache working together. I set up a bash script "~/bin/clang" that looks like this:
#!/bin/bash
ccache /opt/local/bin/clang $@
Obviously this just calls ccache with the clang path and arguments. The surprising thing is that when I invoke clang this way, several classes of warnings are flagged that were not noticed when I ran /opt/local/bin/clang.
The above example is on OS X, where I've installed clang 3.1 via Macports. But I've reproduced the same effect on Linux using clang/llvm that I compiled from the svn (3.1 branch) as well.
Is this expected behavior? Does anybody have an explanation for what's going on here?
--
Larry Gritz
lg at larrygritz.com
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