Break out architecture specific flags into dedicated cache files.

Author: Prabhuk

.github/workflows/libc-fullbuild-tests.yml

@@ -153,7 +153,7 @@ jobs:
           *-none-eabi|riscv32-unknown-elf)
             cmake -DARCH_TRIPLE="${{ matrix.target }}" \
               $CMAKE_FLAGS \
-              -C ${{ github.workspace }}/libc/cmake/caches/Standalone_libc_baremetal.cmake
+              -C ${{ github.workspace }}/libc/cmake/caches/${{ matrix.target }}.cmake
             ;;
           *)
             cmake -DLLVM_RUNTIME_TARGETS=${{ matrix.target }} \

libc/cmake/caches/Standalone_libc_baremetal.cmake

@@ -0,0 +1,7 @@
+set(CMAKE_SYSTEM_PROCESSOR arm CACHE STRING "")
+
+foreach(lang C;CXX;ASM)
+    set(CMAKE_${lang}_FLAGS "-march=armv6m -mcpu=cortex-m0plus -mfloat-abi=soft -Wno-atomic-alignment \"-Dvfprintf(stream, format, vlist)=vprintf(format, vlist)\" \"-Dfprintf(stream, format, ...)=printf(format)\" \"-Dfputs(string, stream)=puts(string)\" -D_LIBCPP_PRINT=1" CACHE STRING "")
+endforeach()
+
+include(${CMAKE_CURRENT_LIST_DIR}/baremetal_common.cmake)

libc/cmake/caches/armv6m-none-eabi.cmake

@@ -0,0 +1,7 @@
+set(CMAKE_SYSTEM_PROCESSOR arm CACHE STRING "")
+
+foreach(lang C;CXX;ASM)
+    set(CMAKE_${lang}_FLAGS "-march=armv7em -mcpu=cortex-m4 -mfloat-abi=soft -Wno-atomic-alignment \"-Dvfprintf(stream, format, vlist)=vprintf(format, vlist)\" \"-Dfprintf(stream, format, ...)=printf(format)\" \"-Dfputs(string, stream)=puts(string)\" -D_LIBCPP_PRINT=1" CACHE STRING "")
+endforeach()
+
+include(${CMAKE_CURRENT_LIST_DIR}/baremetal_common.cmake)

libc/cmake/caches/armv7em-none-eabi.cmake

@@ -0,0 +1,7 @@
+set(CMAKE_SYSTEM_PROCESSOR arm CACHE STRING "")
+
+foreach(lang C;CXX;ASM)
+    set(CMAKE_${lang}_FLAGS "-march=armv7m -mcpu=cortex-m4 -mfloat-abi=soft -Wno-atomic-alignment \"-Dvfprintf(stream, format, vlist)=vprintf(format, vlist)\" \"-Dfprintf(stream, format, ...)=printf(format)\" \"-Dfputs(string, stream)=puts(string)\" -D_LIBCPP_PRINT=1" CACHE STRING "")
+endforeach()
+
+include(${CMAKE_CURRENT_LIST_DIR}/baremetal_common.cmake)

libc/cmake/caches/armv7m-none-eabi.cmake

@@ -0,0 +1,7 @@
+set(CMAKE_SYSTEM_PROCESSOR arm CACHE STRING "")
+
+foreach(lang C;CXX;ASM)
+    set(CMAKE_${lang}_FLAGS "-mfloat-abi=hard -march=armv8.1-m.main+mve.fp+fp.dp -mcpu=cortex-m55" CACHE STRING "")
+endforeach()
+
+include(${CMAKE_CURRENT_LIST_DIR}/baremetal_common.cmake)

libc/cmake/caches/armv8.1m.main-none-eabi.cmake

@@ -0,0 +1,7 @@
+set(CMAKE_SYSTEM_PROCESSOR arm CACHE STRING "")
+
+foreach(lang C;CXX;ASM)
+    set(CMAKE_${lang}_FLAGS "-mfloat-abi=softfp -march=armv8m.main+fp+dsp -mcpu=cortex-m33" CACHE STRING "")
+endforeach()
+
+include(${CMAKE_CURRENT_LIST_DIR}/baremetal_common.cmake)

libc/cmake/caches/armv8m.main-none-eabi.cmake

@@ -0,0 +1,17 @@
+# Expects target triple to be passed as `ARCH_TRIPLE`
+
+set(CMAKE_SYSTEM_NAME Generic CACHE STRING "")
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY CACHE STRING "")
+set(LLVM_ENABLE_RUNTIMES "libc" CACHE STRING "")
+set(LLVM_INCLUDE_TESTS OFF CACHE BOOL "")
+set(CMAKE_C_COMPILER_WORKS ON CACHE BOOL "")
+set(CMAKE_CXX_COMPILER_WORKS ON CACHE BOOL "")
+set(CMAKE_SYSROOT "" CACHE STRING "")
+
+set(CMAKE_C_COMPILER_TARGET ${ARCH_TRIPLE} CACHE STRING "")
+set(CMAKE_CXX_COMPILER_TARGET ${ARCH_TRIPLE} CACHE STRING "")
+set(CMAKE_ASM_COMPILER_TARGET ${ARCH_TRIPLE} CACHE STRING "")
+set(LLVM_DEFAULT_TARGET_TRIPLE ${ARCH_TRIPLE} CACHE STRING "")
+set(LIBC_TARGET_TRIPLE ${ARCH_TRIPLE} CACHE STRING "")
+
+set(LLVM_LIBC_FULL_BUILD "ON" CACHE BOOL "")

libc/cmake/caches/baremetal_common.cmake

@@ -0,0 +1,3 @@
+set(CMAKE_SYSTEM_PROCESSOR RISCV CACHE STRING "")
+
+include(${CMAKE_CURRENT_LIST_DIR}/baremetal_common.cmake)