How do you use cmake + ccache to cross compile in combination with a toolchain compiler wrapper (from crosstool-NG)?
The situation:
cross-compile for arm with a sdk + cmake + ccache
The sdk installation
$ sdk-dat-arm$ ll host/usr/bin/
arm-am3354-linux-gnueabihf-c++ -> ext-toolchain-wrapper*
arm-am3354-linux-gnueabihf-cc -> ext-toolchain-wrapper*
arm-am3354-linux-gnueabihf-cpp -> ext-toolchain-wrapper*
arm-am3354-linux-gnueabihf-g++ -> ext-toolchain-wrapper*
arm-am3354-linux-gnueabihf-gcc -> ext-toolchain-wrapper*
arm-am3354-linux-gnueabihf-gcc-4.9.4 -> ext-toolchain-wrapper*
ccache configuration
/usr/local/bin$ ls -al
arm-am3354-linux-gnueabihf-g++ -> ccache
arm-am3354-linux-gnueabihf-gcc -> ccache
cc -> ccache
ccache
g++ -> ccache
gcc -> ccache
/usr/local/bin/arm-am3354-linux-gnueabihf-gcc --version
arm-am3354-linux-gnueabihf-gcc (crosstool-NG ) 4.9.4 20150629 (prerelease)
cmake configuration
set(CMAKE_C_COMPILER_LAUNCHER ccache)
set(CMAKE_C_COMPILER arm-am3354-linux-gnueabihf-gcc)
set(CMAKE_CXX_COMPILER_LAUNCHER ccache)
set(CMAKE_CXX_COMPILER arm-am3354-linux-gnueabihf-g++)
Executing cmake
$ cmake ....
-- Check for working C compiler: /usr/local/bin/arm-am3354-linux-gnueabihf-gcc
-- Check for working C compiler: /usr/local/bin/arm-am3354-linux-gnueabihf-gcc -- works -- Check for working CXX compiler: /usr/local/bin/arm-am3354-linux-gnueabihf-g++
-- Check for working CXX compiler: /usr/local/bin/arm-am3354-linux-gnueabihf-g++ -- works
Compiling with the above cmake configuration fails ...
-- The CXX compiler identification is GNU 4.9.4
-- Check for working C compiler: /usr/local/bin/arm-am3354-linux-gnueabihf-gcc
-- Check for working CXX compiler: /usr/local/bin/arm-am3354-linux-gnueabihf-g++ -- Check for working CXX compiler: /usr/local/bin/arm-am3354-linux-gnueabihf-g++ -- works
In file included from ... fatal error: libudev.h: No such file or directory compilation terminated.
without the LAUNCHER it compiles successively.
The libudev.h is defined for inclusion in
path/CXX.includecache:libudev.h
Any idea of whats the reason for the compilation failure, i.e. why with the LAUNCHER it wont find the include?
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