No known features for CXX compiler "GNU" version 12.3.1 (arm-none-eabi)

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1

Hi,

We are cross-compiling C++20 for an ARM AArch32 bare-metal target (arm-none-eabi). This usually works fine. However, when we try to include the fmt library (GitHub - fmtlib/fmt: A modern formatting library version 10.2.1), with

find_package(fmt CONFIG REQUIRED)
target_link_libraries(${TARGET_NAME} PUBLIC fmt::fmt)

we get the following error message:
[cmake] No known features for CXX compiler
[cmake]
[cmake] “GNU”
[cmake]
[cmake] version 12.3.1.
[cmake]
[cmake]
[cmake] CMake Generate step failed. Build files cannot be regenerated correctly.

We use the compiler arm-gnu-toolchain-12.3.rel1-x86_64-arm-none-eabi with the following toolchain file: mcux-sdk/tools/cmake_toolchain_files/armgcc.cmake at a6bf851f65020c437704e53d2d9587ae21789d65 · nxp-mcuxpresso/mcux-sdk · GitHub

I tried with the latest CMake 3.29.2, but that did not help.

Any ideas on how to fix this?

Thanks,
Björn

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2

I see a very similar issue trying to compile Boost with an arm-non-eabi compiler with CMake version 3.29.3. I also saw the same issue above with the fmt library. Any update on this issue?

3

No solution yet.

4

Any updates to share? Or input from Kitware?

5

In our particular case, it looks like these options in our toolchain file were the offenders causing this issue. Removing them fixed my similar issue. I don’t know if we add this mistakenly or the STM32 CMake generation did.

set(CMAKE_C_COMPILER_FORCED TRUE)
set(CMAKE_CXX_COMPILER_FORCED TRUE)
6

No updates unfortunately. We did a “hacky” workaround.

7

Great that you found a way to solve it for your case. I will investigate that. Thanks!

8

Removing those lines is the solution.
Forcing a compiler disables information gathering of CMake.

Forcing a compiler is deprecated, please see the module doc for details.

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