jerpelea opened a new pull request, #19641:
URL: https://github.com/apache/nuttx/pull/19641
## Summary
CMake validates a compiler by building and linking a test program. For a
bare metal cross toolchain that link cannot succeed on its own terms, and the
flags NuttX supplies for it assume a toolchain shipped with newlib: gcc.cmake
sets
set(CMAKE_EXE_LINKER_FLAGS_INIT "--specs=nosys.specs")
A perfectly usable arm-none-eabi-gcc built without those specs therefore
fails configuration before a single NuttX source file is considered:
arm-none-eabi-gcc: fatal error: cannot read spec file 'nosys.specs':
No such file or directory
CMake Error: ... CMake will not be able to correctly generate this
project.
Setting CMAKE_TRY_COMPILE_TARGET_TYPE to STATIC_LIBRARY makes the detection
step compile without linking, which is the documented approach for cross
compiling to a bare metal target. Toolchains that do ship nosys.specs are
unaffected: the flag only applies to CMake's own detection, not to the NuttX
link.
This is not arch specific, so it is set once in the top level CMakeLists.txt
alongside the toolchain-file selection, before project() triggers detection.
sim is excluded: it is hosted and links real host executables, so it keeps the
usual executable-based detection. try_compile() reads the variable from the
calling scope, so it takes effect without living in a toolchain file;
tools/toolchain.cmake.export already sets the same for the exported build.
## Impact
RELEASE
## Testing
CI
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