[ccache] Duplicated -arch option results in "unsupported compiler option"

[Gautier Pelloux-Prayer]

Hi,

When invoking ccache with twice -arch option, it fails to use its cache and "unsupported compiler option" counter increment.

Basically doing:

ccache clang test.c -arch i386 # cache miss: 1 - OK
ccache clang test.c -arch i386 # cache hit (direct): 1 - OK
ccache clang test.c -arch i386 -arch i386 # unsupported compiler option: 1 - NOK actually expected cache hit (direct): 2

Similarly, invoking it twice with -Wall option results in cache not being used:

ccache clang test.c -Wall # cache miss: 1 - OK
ccache clang test.c -Wall # cache hit (direct): 1 - OK
ccache clang test.c -Wall -Wall # cache miss: 2 - NOK actually expected cache hit (direct): 2

I know that passing multiple times same options is invalid, but when build process is complex it's quite hard not to have some of them...

Cheers,

Gautier PP.


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