253eb74164
clang-cl produce binaries with MSVC ABI and wants to be as flag-compatible with pure MSVC as possible, so this leads to all sorts of weird cases. clang-cl alias /Wall as clang's -Weverything which is way too verbose, so it needs /W3 like pure MSVC. clang-cl only understand GCC style warning flags (-W[no]blah) and just silent drop MSVC style warning flags (/wd[num]). clang-cl needs MSVC define flags since it is consuming the same header files as pure MSVC. CMake set CMAKE_CXX_COMPILER_ID as Clang when clang-cl is detected, so need extra if (MSVC) to differentiate it. We are not doing clang-cl specialization in Bazel as currently there is no reliable way to detect clang-cl in Bazel.. This PR should be NFC for LLVM/GCC users on Unix platforms. Other changes: Add ABSL_ prefix to variable names to avoid name collision in CMake.
52 lines
2 KiB
CMake
52 lines
2 KiB
CMake
# See absl/copts/copts.py and absl/copts/generate_copts.py
|
|
include(GENERATED_AbseilCopts)
|
|
|
|
set(ABSL_LSAN_LINKOPTS "")
|
|
set(ABSL_HAVE_LSAN OFF)
|
|
|
|
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
|
|
set(ABSL_DEFAULT_COPTS "${ABSL_GCC_FLAGS}")
|
|
set(ABSL_TEST_COPTS "${ABSL_GCC_FLAGS};${ABSL_GCC_TEST_FLAGS}")
|
|
set(ABSL_EXCEPTIONS_FLAG "${ABSL_GCC_EXCEPTIONS_FLAGS}")
|
|
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
|
|
# MATCHES so we get both Clang and AppleClang
|
|
if (MSVC)
|
|
# clang-cl is half MSVC, half LLVM
|
|
set(ABSL_DEFAULT_COPTS "${ABSL_CLANG_CL_FLAGS}")
|
|
set(ABSL_TEST_COPTS "${ABSL_CLANG_CL_FLAGS};${ABSL_CLANG_CL_TEST_FLAGS}")
|
|
set(ABSL_EXCEPTIONS_FLAG "${ABSL_CLANG_CL_EXCEPTIONS_FLAGS}")
|
|
else()
|
|
set(ABSL_DEFAULT_COPTS "${ABSL_LLVM_FLAGS}")
|
|
set(ABSL_TEST_COPTS "${ABSL_LLVM_FLAGS};${ABSL_LLVM_TEST_FLAGS}")
|
|
set(ABSL_EXCEPTIONS_FLAG "${ABSL_LLVM_EXCEPTIONS_FLAGS}")
|
|
if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
|
|
# AppleClang doesn't have lsan
|
|
# https://developer.apple.com/documentation/code_diagnostics
|
|
if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 3.5)
|
|
set(ABSL_LSAN_LINKOPTS "-fsanitize=leak")
|
|
set(ABSL_HAVE_LSAN ON)
|
|
endif()
|
|
endif()
|
|
endif()
|
|
elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
|
|
set(ABSL_DEFAULT_COPTS "${ABSL_MSVC_FLAGS}")
|
|
set(ABSL_TEST_COPTS "${ABSL_MSVC_FLAGS};${ABSL_MSVC_TEST_FLAGS}")
|
|
set(ABSL_EXCEPTIONS_FLAG "${ABSL_MSVC_EXCEPTIONS_FLAGS}")
|
|
else()
|
|
message(WARNING "Unknown compiler: ${CMAKE_CXX_COMPILER}. Building with no default flags")
|
|
set(ABSL_DEFAULT_COPTS "")
|
|
set(ABSL_TEST_COPTS "")
|
|
set(ABSL_EXCEPTIONS_FLAG "")
|
|
endif()
|
|
|
|
# This flag is used internally for Bazel builds and is kept here for consistency
|
|
set(ABSL_EXCEPTIONS_FLAG_LINKOPTS "")
|
|
|
|
if("${CMAKE_CXX_STANDARD}" EQUAL 98)
|
|
message(FATAL_ERROR "Abseil requires at least C++11")
|
|
elseif(NOT "${CMAKE_CXX_STANDARD}")
|
|
message(STATUS "No CMAKE_CXX_STANDARD set, assuming 11")
|
|
set(ABSL_CXX_STANDARD 11)
|
|
else()
|
|
set(ABSL_CXX_STANDARD "${CMAKE_CXX_STANDARD}")
|
|
endif()
|