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Help the Skia build to find clang

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..even if cmake sets CC/CXX to GCC.
This commit is contained in:
Simon Hausmann 2023-09-12 11:05:58 +02:00 • committed by Simon Hausmann
parent 779e216b2a
commit 8b478431a7
1 changed files with 50 additions and 32 deletions
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82
api/cpp/CMakeLists.txt
View file

@ -204,39 +204,57 @@ else(SLINT_STYLE)
set_property(GLOBAL PROPERTY SLINT_STYLE ${SLINT_STYLE_DEFAULT})
endif(SLINT_STYLE)
# The Skia cross-build requires a host C compiler (due to some build dependencies of rust-skia),
# so cc.rs will first look for CC_<triplet> and then HOST_CC.
# When cross-compiling, CMake doesn't really know what the host compiler is. Corrosion will set
# HOST_CC to $CC, which is a good bet. Unfortunately in Yocto environments, CC will be set to
# the cross-compiler. The same applies to CFLAGS, which may contain target specific options.
# So the hack to solve this is two-fold:
# * We look for clang or gcc in PATH - unprefixed those are usually host compilers.
# * Through corrosion we know the correct host value of CC_<triplet>.
# Finally, we set CC_<host triplet> to clang or gcc and empty CFLAGS_<host triplet>
if((SLINT_FEATURE_RENDERER_SKIA OR SLINT_FEATURE_RENDERER_SKIA_OPENGL OR SLINT_FEATURE_RENDERER_SKIA_VULKAN) AND CMAKE_CROSSCOMPILING AND Rust_CARGO_HOST_TARGET)
find_program(CLANG clang)
if(CLANG)
set(host_cc "${CLANG}")
else()
find_program(GCC gcc)
if (GCC)
set(host_cc "${GCC}")
endif()
if(SLINT_FEATURE_RENDERER_SKIA OR SLINT_FEATURE_RENDERER_SKIA_OPENGL OR SLINT_FEATURE_RENDERER_SKIA_VULKAN)
find_program(CLANGCC clang)
find_program(CLANGCXX clang++)
if(CLANGCC AND CLANGCXX)
set_property(
TARGET slint-cpp
APPEND
PROPERTY CORROSION_ENVIRONMENT_VARIABLES
CLANGCC=${CLANGCC}
)
set_property(
TARGET slint-cpp
APPEND
PROPERTY CORROSION_ENVIRONMENT_VARIABLES
CLANGCXX=${CLANGCXX}
)
endif()
if(host_cc)
string(REPLACE "-" "_" cargo_host_target_underscore "${Rust_CARGO_HOST_TARGET}")
set_property(
TARGET slint-cpp
APPEND
PROPERTY CORROSION_ENVIRONMENT_VARIABLES
CC_${cargo_host_target_underscore}=${host_cc}
)
set_property(
TARGET slint-cpp
APPEND
PROPERTY CORROSION_ENVIRONMENT_VARIABLES
CFLAGS_${cargo_host_target_underscore}=
)
# The Skia cross-build requires a host C compiler (due to some build dependencies of rust-skia),
# so cc.rs will first look for CC_<triplet> and then HOST_CC.
# When cross-compiling, CMake doesn't really know what the host compiler is. Corrosion will set
# HOST_CC to $CC, which is a good bet. Unfortunately in Yocto environments, CC will be set to
# the cross-compiler. The same applies to CFLAGS, which may contain target specific options.
# So the hack to solve this is two-fold:
# * We look for clang or gcc in PATH - unprefixed those are usually host compilers.
# * Through corrosion we know the correct host value of CC_<triplet>.
# Finally, we set CC_<host triplet> to clang or gcc and empty CFLAGS_<host triplet>
if(CMAKE_CROSSCOMPILING AND Rust_CARGO_HOST_TARGET)
if(CLANGCC)
set(host_cc "${CLANGCC}")
else()
find_program(GCC gcc)
if (GCC)
set(host_cc "${GCC}")
endif()
endif()
if(host_cc)
string(REPLACE "-" "_" cargo_host_target_underscore "${Rust_CARGO_HOST_TARGET}")
set_property(
TARGET slint-cpp
APPEND
PROPERTY CORROSION_ENVIRONMENT_VARIABLES
CC_${cargo_host_target_underscore}=${host_cc}
)
set_property(
TARGET slint-cpp
APPEND
PROPERTY CORROSION_ENVIRONMENT_VARIABLES
CFLAGS_${cargo_host_target_underscore}=
)
endif()
endif()
endif()