更改在makefile中调用的编译器

Question

I have a make file that currently uses cmake to compile a collection of source files, but I would like to change it so it uses intel's c compiler. Can I just change all the cmake to icc or...how would this be done?

Below is the make file as-is, it's from a crypto-mining daemon for bytecoin.

all: all-release

cmake-debug:
    mkdir -p build/debug
    cd build/debug && cmake -D CMAKE_BUILD_TYPE=Debug ../..

build-debug: cmake-debug
    cd build/debug && $(MAKE)

test-debug: build-debug
    cd build/debug && $(MAKE) test

all-debug: build-debug

cmake-release:
    mkdir -p build/release
    cd build/release && cmake -D CMAKE_BUILD_TYPE=Release ../..

build-release: cmake-release
    cd build/release && $(MAKE)

test-release: build-release
    cd build/release && $(MAKE) test

all-release: build-release

clean:
    rm -rf build

tags:
    ctags -R --sort=1 --c++-kinds=+p --fields=+iaS --extra=+q --language-force=C++ src contrib tests/gtest

.PHONY: all cmake-debug build-debug test-debug all-debug cmake-release build-release test-release all-release clean tags

I can post the other files it creates in /build after a normal build, if that would help, but I imagine whatever process I have to do to change the compiler would be the same for each MAKE file.

Otherwise, the rest of the source files can be found here:

https://github.com/amjuarez/bytecoin

I am running Ubuntu 14.04.

Thanks in advance!

Answer 1

You specify your toolchain settings for CMake using a toolchain.txt file with the -DCMAKE_TOOLCHAIN_FILE=path/to/file on the first call of CMake, that generates the makefiles:

cmake -G"Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=<path_to>/toolchain.txt

There should be entries like

set(CMAKE_C_COMPILER /<your-toolchain-path>/gcc)
set(CMAKE_CXX_COMPILER /<your-toolchain-path>/g++)

in toolchain.txt .

Answer 2

Typically CXX=<mycompiler> cmake should do what you want. Or you can modify the toolchain files of the project, assuming you want to permanently make the change.

This is my script that runs cmake to build llvm/clang with clang and clang++:

CC=clang CXX=clang++ cmake -DCMAKE_BUILD_TYPE=Release\ 
-DLLVM_ENABLE_ASSERTIONS=1  -DLLVM_TARGETS_TO_BUILD=X86 ../llvm