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[CMake][Fuchsia] Compile runtimes with -ffuchsia-api-level (#211753)

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Use the supplied Fuchsia SDK's version_history.json to deduce the
oldest API level still supported, and target that for toolchain
runtimes so they'll be runtime-compatible when linked into user
programs that target any SDK-supported API level.
This commit is contained in:
Roland McGrath 2026-07-29 10:59:32 -07:00 committed by GitHub
parent aa924278ef
commit d6a165836c
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1 changed files with 19 additions and 1 deletions
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20
clang/cmake/caches/Fuchsia-stage2.cmake
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@ -199,13 +199,31 @@ foreach(target aarch64-unknown-linux-gnu;armv7-unknown-linux-gnueabihf;i386-unkn
endforeach()
if(FUCHSIA_SDK)
# Since there is only one build of the toolchain runtimes for users doing any
# supported -ffuchsia-api-level=... build, target the oldest unretired level.
file(READ "${FUCHSIA_SDK}/version_history.json" FUCHSIA_SDK_VERSION_HISTORY)
string(JSON FUCHSIA_SDK_API_LEVEL_COUNT LENGTH "${FUCHSIA_SDK_VERSION_HISTORY}" "data" "api_levels")
math(EXPR FUCHSIA_SDK_API_LEVEL_MAXIDX "${FUCHSIA_SDK_API_LEVEL_COUNT} - 1")
set(FUCHSIA_API_LEVEL 0)
foreach(idx RANGE ${FUCHSIA_SDK_API_LEVEL_MAXIDX})
string(JSON FUCHSIA_API_LEVEL_NAME MEMBER "${FUCHSIA_SDK_VERSION_HISTORY}" "data" "api_levels" ${idx})
string(JSON FUCHSIA_API_LEVEL_PHASE GET "${FUCHSIA_SDK_VERSION_HISTORY}" "data" "api_levels" "${FUCHSIA_API_LEVEL_NAME}" "phase")
if(NOT "${FUCHSIA_API_LEVEL_PHASE}" STREQUAL "retired")
set(FUCHSIA_API_LEVEL_INT ${FUCHSIA_API_LEVEL_NAME})
if(FUCHSIA_API_LEVEL EQUAL 0 OR FUCHSIA_API_LEVEL_INT LESS FUCHSIA_API_LEVEL)
set(FUCHSIA_API_LEVEL ${FUCHSIA_API_LEVEL_INT})
endif()
endif()
endforeach()
message(STATUS "Runtimes target Fuchsia API level ${FUCHSIA_API_LEVEL}")
set(FUCHSIA_aarch64-unknown-fuchsia_NAME arm64)
set(FUCHSIA_arm-unknown-fuchsia_NAME arm)
set(FUCHSIA_i386-unknown-fuchsia_NAME x64)
set(FUCHSIA_x86_64-unknown-fuchsia_NAME x64)
set(FUCHSIA_riscv64-unknown-fuchsia_NAME riscv64)
foreach(target i386-unknown-fuchsia;x86_64-unknown-fuchsia;aarch64-unknown-fuchsia;arm-unknown-fuchsia;riscv64-unknown-fuchsia)
set(FUCHSIA_${target}_COMPILER_FLAGS "--target=${target} -I${FUCHSIA_SDK}/pkg/sync/include -I${FUCHSIA_SDK}/pkg/fdio/include -fstack-size-section -fexperimental-call-graph-section")
set(FUCHSIA_${target}_COMPILER_FLAGS "--target=${target} -ffuchsia-api-level=${FUCHSIA_API_LEVEL} -I${FUCHSIA_SDK}/pkg/sync/include -I${FUCHSIA_SDK}/pkg/fdio/include -fstack-size-section -fexperimental-call-graph-section")
set(FUCHSIA_${target}_LINKER_FLAGS "-L${FUCHSIA_SDK}/arch/${FUCHSIA_${target}_NAME}/lib")
set(FUCHSIA_${target}_SYSROOT "${FUCHSIA_SDK}/arch/${FUCHSIA_${target}_NAME}/sysroot")
endforeach()