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[RISC-V] Support CMake build with custom compiler flags

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This CL aims to support custom compiler flags.
Because upstream clang has supported to build for x280 with -mcpu=sifive-x280.

Change-Id: Ic8fbf026fe6805ac5c3422a9ccc3f53293c89570
Signed-off-by: Bruce Lai <bruce.lai@sifive.com>
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4713191
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
This commit is contained in:
Bruce Lai 2023-07-24 22:07:29 -07:00 committed by libyuv LUCI CQ
parent 423e2b97ea
commit b76fcd4654
2 changed files with 25 additions and 10 deletions
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12
docs/getting_started.md
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@ -238,6 +238,18 @@ After running script, clang & qemu are built in `build-toolchain-qemu/riscv-clan
-DUSE_RVV=ON . -DUSE_RVV=ON .
cmake --build out/Release/ cmake --build out/Release/
#### Customized Compiler Flags
Customized compiler flags are supported by `-DRISCV_COMPILER_FLAGS="xxx"`.
If `-DRISCV_COMPILER_FLAGS="xxx"` is manually assigned, other compile flags(e.g disable -march=xxx) will not be appended.
Example:
cmake -B out/Release/ -DUNIT_TEST=ON \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_TOOLCHAIN_FILE="./riscv_script/riscv-clang.cmake" \
-DRISCV_COMPILER_FLAGS="-mcpu=sifive-x280" \
.
### Run on QEMU ### Run on QEMU

23
riscv_script/riscv-clang.cmake
View File

@ -28,17 +28,20 @@ set(CMAKE_OBJDUMP "${TOOLCHAIN_PATH}/bin/llvm-objdump")
set(CMAKE_OBJCOPY "${TOOLCHAIN_PATH}/bin/llvm-objcopy") set(CMAKE_OBJCOPY "${TOOLCHAIN_PATH}/bin/llvm-objcopy")
# compile options # compile options
message(STATUS "USE_RVV: ${USE_RVV}") set(RISCV_COMPILER_FLAGS "" CACHE STRING "Compile flags")
message(STATUS "USE_AUTO_VECTORIZER: ${USE_AUTO_VECTORIZER}") # if user provides RISCV_COMPILER_FLAGS, appeding compile flags is avoided.
set(RISCV_COMPILER_FLAGS) if(RISCV_COMPILER_FLAGS STREQUAL "")
if(USE_RVV) message(STATUS "USE_RVV: ${USE_RVV}")
list(APPEND RISCV_COMPILER_FLAGS "-march=rv64gcv") message(STATUS "USE_AUTO_VECTORIZER: ${USE_AUTO_VECTORIZER}")
if(NOT USE_AUTO_VECTORIZER) if(USE_RVV)
# Disable auto-vectorizer list(APPEND RISCV_COMPILER_FLAGS "-march=rv64gcv")
add_compile_options(-fno-vectorize -fno-slp-vectorize) if(NOT USE_AUTO_VECTORIZER)
# Disable auto-vectorizer
add_compile_options(-fno-vectorize -fno-slp-vectorize)
endif()
else()
list(APPEND RISCV_COMPILER_FLAGS "-march=rv64gc")
endif() endif()
else()
list(APPEND RISCV_COMPILER_FLAGS "-march=rv64gc")
endif() endif()
message(STATUS "RISCV_COMPILER_FLAGS: ${RISCV_COMPILER_FLAGS}") message(STATUS "RISCV_COMPILER_FLAGS: ${RISCV_COMPILER_FLAGS}")