Unable to cross compile openssl/3.x.x on develop2

[f-scholer]

I am unable to cross compile openssl/3.x.x on develop2.
I can cross compile openssl with the following command:
conan install . --build=force -pr:b=default -pr:h=./profiles/mingw
mingw.txt

But doing the same with conan_provider:
cmake -B build/win -S example -DCMAKE_TOOLCHAIN_FILE=toolchain/x86_64-mingw_linux_toolchain.cmake -DCMAKE_PROJECT_TOP_LEVEL_INCLUDES=cmake/conan_provider.cmake -DCMAKE_BUILD_TYPE=Release
x86_64-mingw_linux_toolchain.txt

gives this
build.txt

the conan_provider generated profile appears to be incomplete:
[settings]
arch=x86_64
os=Windows
compiler=gcc
compiler.version=10
compiler.cppstd=20
compiler.libcxx=libstdc++11
build_type=Release
[conf]
tools.cmake.cmaketoolchain:generator=Unix Makefiles
tools.build:compiler_executables={"c":"/bin/x86_64-w64-mingw32-gcc-posix","cpp":"/bin/x86_64-w64-mingw32-g++-posix"}

I tried appending updating the profile without luck:
tools.build:compiler_executables={"c":"/bin/x86_64-w64-mingw32-gcc-posix","cpp":"/bin/x86_64-w64-mingw32-g++-posix","rc":"/bin/x86_64-w64-mingw32-windres","RC":"/bin/x86_64-w64-mingw32-windres","windres":"/bin/x86_64-w64-mingw32-windres"}

[memsharded]

Hi @f-scholer

Thanks for your report.
It seems that the missing bit in cmake-conan would be the definition of rc compiler, but I am confused that you tried to specify it, and it didn't work. Was the output error exactly the same when adding rc to compiler_executables?

[memsharded]

Ok, I just realized. The openssl recipe uses the AutotoolsToolchain that defines the compiler mapping as: compilers_mapping = {"c": "CC", "cpp": "CXX", "cuda": "NVCC", "fortran": "FC"}

In other words, it is not prepared for cross-compiling from Linux -> Windows and defining the RC compiler.

So the issue needs to be addressed in both places, opening another ticket in the Conan client

[memsharded]

In the meantime, you can define a profile with just the [buildenv] section, and pass it to your build as defined in the readme -DCONAN_HOST_PROFILE="default;custom"

[f-scholer]

Thanks for the quick action and suggestion. That works.

I had modified conan_provider.cmake to write the buildenv entries:
macro(append_buildenv_configuration)
if(CMAKE_C_COMPILER)
string(APPEND PROFILE "CC=${CMAKE_C_COMPILER}\n")
endif()
if(CMAKE_CXX_COMPILER)
string(APPEND PROFILE "CXX=${CMAKE_CXX_COMPILER}\n")
endif()
if(CMAKE_RC_COMPILER)
string(APPEND PROFILE "RC=${CMAKE_RC_COMPILER}\n")
endif()
endmacro()
...
string(APPEND PROFILE "[buildenv]\n")

propagate compilers

append_buildenv_configuration()

[memsharded]

conan-io/conan#15946 has been merged it will be in the next Conan 2.3 release

[memsharded]

This ticket was closed by #632