如果编译器绝对路径硬编码在 makefile 中，我应该如何使用 ccache？

Question

It's not an option for me to modify the complicated nest of makefiles that builds our code, and in various places they construct absolute paths to very specific compilers, eg /home/arm2gcc/gcc-arm-none-eabi-8-2018-q4-major/bin/arm-none-eabi-gcc

That makes it hard to use ccache either as a prefix or by putting it first in the path.

So I wonder about moving the compiler installations on my personal machine to eg /home/arm2gcc-real and putting fake scripts in /home/arm2gcc that redirect to the real compilers.

Can anyone suggest how to do this? Or is there a better way?

Answer 1

Disclaimer: I've only limited experience with Ccache and CMake.

Can you try adding this in the root CMakeLists.txt file:

find_program(CCACHE ccache)
if(CCACHE)
    set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ${CCACHE})
endif()

If that does not work, I think we may need some more info on how the compilers are setup exactly in your CMakeLists.txt files.

Answer 2

I suggest:

mv .../bin/arm-none-eabi-gcc .../bin/arm-none-eabi-gcc.real

Then, create a script to replace .../bin/arm-none-eabi-gcc with this content:

#!/bin/sh
exec ccache ${0}.real "$@"