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[libc][cmake] Tidy compiler includes #66783

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Merged
merged 3 commits into from
Sep 19, 2023
Merged

[libc][cmake] Tidy compiler includes #66783

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5e9d486
[libc][cmake] Tidy compiler includes
gchatelet Sep 19, 2023
f5dbbcc
Use set_directory_properties
gchatelet Sep 19, 2023
ba68116
Also update tests
gchatelet Sep 19, 2023
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5 changes: 5 additions & 0 deletions libc/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,11 @@ endif()
include(${LLVM_COMMON_CMAKE_UTILS}/Modules/CMakePolicy.cmake
NO_POLICY_SCOPE)

# `llvm-project/llvm/CMakeLists.txt` adds the following directive
# `include_directories( ${LLVM_INCLUDE_DIR} ${LLVM_MAIN_INCLUDE_DIR})`
# We undo it to be able to precisely control what is getting included.
set_directory_properties(PROPERTIES INCLUDE_DIRECTORIES "")

# Default to C++17
set(CMAKE_CXX_STANDARD 17)

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31 changes: 13 additions & 18 deletions libc/cmake/modules/LLVMLibCObjectRules.cmake
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Expand Up @@ -151,7 +151,6 @@ function(_build_gpu_objects fq_target_name internal_target_name)
${ARGN}
)

set(include_dirs ${LIBC_SOURCE_DIR} ${LIBC_INCLUDE_DIR})
set(common_compile_options ${ADD_GPU_OBJ_COMPILE_OPTIONS})
if(NOT ADD_GPU_OBJ_CXX_STANDARD)
set(ADD_GPU_OBJ_CXX_STANDARD ${CMAKE_CXX_STANDARD})
Expand Down Expand Up @@ -189,13 +188,10 @@ function(_build_gpu_objects fq_target_name internal_target_name)
)

target_compile_options(${gpu_target_name} PRIVATE ${compile_options})
target_include_directories(${gpu_target_name} PRIVATE ${include_dirs})
target_include_directories(${gpu_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
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Marking include directory as "system" will hide warnings from the headers located in this directory.
It might be worth adding -Wsystem-headers to compilation flags to mitigate the issue.

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@gchatelet gchatelet Sep 20, 2023 •
edited
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Thx for chiming in here :)

Marking include directory as "system" will hide warnings from the headers located in this directory.

Yes this is on purpose. At least for clang-tidy we don't want the libc generated headers to participate in the clang-tidy checks (see #66477 (comment))

-Wsystem-headers is indeed a good way to catch errors in generated headers but it will potentially also catch warnings in the headers we don't own (clang provided headers or linux headers). WDYT @sivachandra ?

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Ah, right. For some reason I thought that libc is fully isolated from the OS, but it may indeed pull OS headers, and those probably aren't clean (I can imagine warnings about unsupported attributes, pragmas, etc.).
On the other hand, -isystem suppresses warnings coming from libc's headers when building libc itself. This is probably lesser evil.

target_include_directories(${gpu_target_name} PRIVATE ${LIBC_SOURCE_DIR})
target_compile_definitions(${gpu_target_name} PRIVATE LIBC_COPT_PUBLIC_PACKAGING)
set_target_properties(
${gpu_target_name}
PROPERTIES
CXX_STANDARD ${ADD_GPU_OBJ_CXX_STANDARD}
)
set_target_properties(${gpu_target_name} PROPERTIES CXX_STANDARD ${ADD_GPU_OBJ_CXX_STANDARD})
if(ADD_GPU_OBJ_DEPENDS)
add_dependencies(${gpu_target_name} ${ADD_GPU_OBJ_DEPENDS})
endif()
Expand Down Expand Up @@ -261,7 +257,8 @@ function(_build_gpu_objects fq_target_name internal_target_name)
target_compile_options(${fq_target_name} PRIVATE
"SHELL:-Xclang -fembed-offload-object=${packaged_gpu_binary}")
endforeach()
target_include_directories(${fq_target_name} PRIVATE ${include_dirs})
target_include_directories(${fq_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_target_name} PRIVATE ${LIBC_SOURCE_DIR})
add_dependencies(${fq_target_name}
${full_deps_list} ${packaged_gpu_names} ${stub_target_name})

Expand All @@ -285,7 +282,8 @@ function(_build_gpu_objects fq_target_name internal_target_name)
get_nvptx_compile_options(nvptx_options ${LIBC_GPU_TARGET_ARCHITECTURE})
target_compile_options(${internal_target_name} PRIVATE ${nvptx_options})
endif()
target_include_directories(${internal_target_name} PRIVATE ${include_dirs})
target_include_directories(${internal_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${internal_target_name} PRIVATE ${LIBC_SOURCE_DIR})
if(full_deps_list)
add_dependencies(${internal_target_name} ${full_deps_list})
endif()
Expand Down Expand Up @@ -369,12 +367,8 @@ function(create_object_library fq_target_name)
${ADD_OBJECT_SRCS}
${ADD_OBJECT_HDRS}
)
target_include_directories(
${fq_target_name}
PRIVATE
${LIBC_SOURCE_DIR}
${LIBC_INCLUDE_DIR}
)
target_include_directories(${fq_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_target_name} PRIVATE ${LIBC_SOURCE_DIR})
target_compile_options(${fq_target_name} PRIVATE ${compile_options})
endif()

Expand Down Expand Up @@ -633,7 +627,6 @@ function(create_entrypoint_object fq_target_name)
"${ADD_ENTRYPOINT_OBJ_FLAGS}"
${ADD_ENTRYPOINT_OBJ_COMPILE_OPTIONS}
)
set(include_dirs ${LIBC_SOURCE_DIR} ${LIBC_INCLUDE_DIR})
get_fq_deps_list(fq_deps_list ${ADD_ENTRYPOINT_OBJ_DEPENDS})
set(full_deps_list ${fq_deps_list} libc.src.__support.common)

Expand Down Expand Up @@ -670,7 +663,8 @@ function(create_entrypoint_object fq_target_name)
${ADD_ENTRYPOINT_OBJ_HDRS}
)
target_compile_options(${internal_target_name} BEFORE PRIVATE ${common_compile_options})
target_include_directories(${internal_target_name} PRIVATE ${include_dirs})
target_include_directories(${internal_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${internal_target_name} PRIVATE ${LIBC_SOURCE_DIR})
add_dependencies(${internal_target_name} ${full_deps_list})
target_link_libraries(${internal_target_name} ${full_deps_list})

Expand All @@ -684,7 +678,8 @@ function(create_entrypoint_object fq_target_name)
${ADD_ENTRYPOINT_OBJ_HDRS}
)
target_compile_options(${fq_target_name} BEFORE PRIVATE ${common_compile_options} -DLIBC_COPT_PUBLIC_PACKAGING)
target_include_directories(${fq_target_name} PRIVATE ${include_dirs})
target_include_directories(${fq_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_target_name} PRIVATE ${LIBC_SOURCE_DIR})
add_dependencies(${fq_target_name} ${full_deps_list})
target_link_libraries(${fq_target_name} ${full_deps_list})
endif()
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32 changes: 8 additions & 24 deletions libc/cmake/modules/LLVMLibCTestRules.cmake
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Expand Up @@ -148,12 +148,8 @@ function(create_libc_unittest fq_target_name)
${LIBC_UNITTEST_SRCS}
${LIBC_UNITTEST_HDRS}
)
target_include_directories(
${fq_build_target_name}
PRIVATE
${LIBC_SOURCE_DIR}
${LIBC_INCLUDE_DIR}
)
target_include_directories(${fq_build_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_build_target_name} PRIVATE ${LIBC_SOURCE_DIR})
target_compile_options(
${fq_build_target_name}
PRIVATE -fpie ${LIBC_COMPILE_OPTIONS_DEFAULT}
Expand Down Expand Up @@ -386,12 +382,8 @@ function(add_libc_fuzzer target_name)
${LIBC_FUZZER_SRCS}
${LIBC_FUZZER_HDRS}
)
target_include_directories(
${fq_target_name}
PRIVATE
${LIBC_SOURCE_DIR}
${LIBC_INCLUDE_DIR}
)
target_include_directories(${fq_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_target_name} PRIVATE ${LIBC_SOURCE_DIR})

target_link_libraries(${fq_target_name} PRIVATE
${link_object_files}
Expand Down Expand Up @@ -516,12 +508,8 @@ function(add_integration_test test_name)
)
set_target_properties(${fq_build_target_name}
PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
target_include_directories(
${fq_build_target_name}
PRIVATE
${LIBC_SOURCE_DIR}
${LIBC_INCLUDE_DIR}
)
target_include_directories(${fq_build_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_build_target_name} PRIVATE ${LIBC_SOURCE_DIR})
target_compile_options(${fq_build_target_name}
PRIVATE -fpie -ffreestanding -fno-exceptions -fno-rtti ${INTEGRATION_TEST_COMPILE_OPTIONS})
# The GPU build requires overriding the default CMake triple and architecture.
Expand Down Expand Up @@ -683,12 +671,8 @@ function(add_libc_hermetic_test test_name)
RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
#OUTPUT_NAME ${fq_target_name}
)
target_include_directories(
${fq_build_target_name}
PRIVATE
${LIBC_SOURCE_DIR}
${LIBC_INCLUDE_DIR}
)
target_include_directories(${fq_build_target_name} SYSTEM PRIVATE ${LIBC_INCLUDE_DIR})
target_include_directories(${fq_build_target_name} PRIVATE ${LIBC_SOURCE_DIR})
target_compile_options(${fq_build_target_name}
PRIVATE ${LIBC_HERMETIC_TEST_COMPILE_OPTIONS} ${HERMETIC_TEST_COMPILE_OPTIONS})

Expand Down
2 changes: 1 addition & 1 deletion libc/utils/HdrGen/CMakeLists.txt
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Expand Up @@ -14,7 +14,7 @@ add_tablegen(libc-hdrgen LIBC
PublicAPICommand.h
)

target_include_directories(libc-hdrgen PRIVATE ${LIBC_SOURCE_DIR})
target_include_directories(libc-hdrgen PRIVATE ${LLVM_INCLUDE_DIR} ${LLVM_MAIN_INCLUDE_DIR})
target_link_libraries(libc-hdrgen PRIVATE LibcTableGenUtil)

add_subdirectory(PrototypeTestGen)
1 change: 1 addition & 0 deletions libc/utils/LibcTableGenUtil/CMakeLists.txt
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Expand Up @@ -6,3 +6,4 @@ add_llvm_library(
LINK_COMPONENTS Support TableGen
)
target_include_directories(LibcTableGenUtil PUBLIC ${LIBC_SOURCE_DIR})
target_include_directories(LibcTableGenUtil PRIVATE ${LLVM_INCLUDE_DIR} ${LLVM_MAIN_INCLUDE_DIR})