Setting up stdlib path while compiling with mingw on linux - c++

Question

I am trying to build my c++ CMake project on linux with mingw. CMakeLists.txt consists of (for understanding):
Setting up project info:
project(<project name> LANGUAGES CXX)
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
Setting up TRY_COMPILE target type:
set(CMAKE_TRY_COMPILE_TARGET_TYPE "STATIC_LIBRARY")
Setting up boost:
set(Boost_USE_STATIC_LIBS ON)
set(Boost_USE_MULTITHREADED ON)
set(Boost_USE_STATIC_RUNTIME OFF)
find_package(Boost COMPONENTS system program_options REQUIRED)
Including subdirectories in which there is nothing about mingw:
add_subdirectory(<some_subdirectory>)
...
At the time of build process I see the following compilation command in the log:
/usr/bin/x86_64-w64-mingw32-g++ -I/usr/include -I<user include 1> -I<user include 2> -O3 -DNDEBUG -std=gnu++20 -MD -MT CMakeFiles/common.dir/<source>.cpp.o -MF <source>.cpp.o.d -o <source>.cpp.o -c <project path>/<source>.cpp
After that goes a compiler error message with the following beginning:
[build] In file included from /usr/x86_64-w64-mingw32/include/c++/12.2.0/cstdint:41,
[build] from /usr/x86_64-w64-mingw32/include/c++/12.2.0/bits/char_traits.h:731,
[build] from /usr/x86_64-w64-mingw32/include/c++/12.2.0/ios:40,
[build] from /usr/x86_64-w64-mingw32/include/c++/12.2.0/ostream:38,
[build] from <project path>/<source>.hpp:5,
[build] from <project path>/<source>.cpp:1:
[build] /usr/include/stdint.h:90:33: error: conflicting declaration «typedef long unsigned int uintptr_t»
[build] 90 | typedef unsigned long int uintptr_t;
[build] | ^~~~~~~~~
...
According to the internet this error message is connected with the different mingw standard library implementation.
I guess in a compile command there should somehow be -I/usr/x86_64-w64-mingw32/include on a place of -I/usr/include in a compilation command. If I am right there, the question is "How to change standard include directory for mingw build spicifically?". If I am not right there, then how to solve the problem with project building?
PS: The project builds using both clang++ and g++.

Answer 1

You probably need a toolchain file for your cross-compiler.
But I'd suggest using quasi-msys2, which takes care of this, and also gives you access to prebuilt libraries for MinGW (Boost in your case).
Install dependencies (this assumes Ubuntu, for other distributions adjust as needed)
# Install Clang and LLD
bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)"
# Install other dependencies
sudo apt install make wget tar zstd gpg wine
Install and run quasi-msys2:
git clone https://github.com/holyblackcat/quasi-msys2
cd quasi-msys2/
make install _gcc _boost
env/shell.sh
cd ..
Now build your repo:
git clone https://github.com/gogagum/archiever
cd archiever/
git checkout dev
git submodule update --init --recursive
cmake -B build/
cmake --build build/ -j4
I tried running the test app too:
cd build/numerical/
./numerical_encoder.exe --input-file Makefile # This uses Wine automatically