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newlib/picolibc auto detection #2934

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8450c27
auto-detect PICO_CLIB for gcc
rgrr May 14, 2026
142d055
removed some unnecessary lines
rgrr May 14, 2026
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22 changes: 18 additions & 4 deletions src/rp2_common/pico_clib_interface/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -35,9 +35,23 @@ if (NOT TARGET pico_clib_interface)
pico_mirrored_target_link_libraries(pico_llvm_libc_interface INTERFACE pico_stdio)

if (NOT PICO_CLIB)
# PICO_CMAKE_CONFIG: PICO_CLIB, The C library to use e.g. newlib/picolibc/llvm_libc, type=string, default=based on PICO_COMPILER, group=build, docref=cmake-toolchain-config
set(PICO_CLIB newlib)
endif()

# if no PICO_CLIB specified check for gcc existance of either newlib or picolibc
if(PICO_COMPILER_CC MATCHES "gcc$")
execute_process(
COMMAND ${PICO_COMPILER_CC} -print-file-name=nano.specs
OUTPUT_VARIABLE PICOLIBC_SPECS_PATH
OUTPUT_STRIP_TRAILING_WHITESPACE
)

# nano.specs exists if gcc/clang returns a complete path -> newlib exists
if(EXISTS "${PICOLIBC_SPECS_PATH}")
set(PICO_CLIB "newlib")
else()
# otherwise give picolibc a try
set(PICO_CLIB "picolibc")
endif()
endif()
endif()

target_link_libraries(pico_clib_interface INTERFACE pico_${PICO_CLIB}_interface)
endif()