How to Use CCache with CMake?

Amit_Kumar_19501 0
Viewed 58722

I would like to do the following: If CCache is present in PATH, use "ccache g++" for compilation, else use g++. I tried writing a small my-cmake script containing 

    CC="ccache gcc" CXX="ccache g++" cmake $*

but it does not seem to work (running make still does not use ccache; I checked this using CMAKE_VERBOSE_MAKEFILE on).

Update:

As per this link I tried changing my script to

     cmake -D CMAKE_CXX_COMPILER="ccache" -D CMAKE_CXX_COMPILER_ARG1="g++" -D CMAKE_C_COMPILER="ccache" -D CMAKE_C_COMPILER_ARG1="gcc" $*

but cmake bails out complaining that a test failed on using the compiler ccache (which can be expected).

ccache cmake unix c++
9 Answers

I personally have /usr/lib/ccache in my $PATH. This directory contains loads of symlinks for every possible name the compiler could be called from (like gcc and gcc-4.3), all pointing to ccache.

And I didn't even create the symlinks. That directory comes pre-filled when I install ccache on Debian.

user_2373490

It is extending @Nicolas answer.

Add following line to your cmake file:

list(PREPEND CMAKE_PROGRAM_PATH /usr/lib/ccache)

Or add it as argument to cmake configuration step:

cmake -DCMAKE_PROGRAM_PATH=/usr/lib/ccache
user_26567990
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