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Allow users to remove SYSTEM keyword because it forces C linkage for some gcc versions. (#574)

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Co-authored-by: MacGregor, Andy <amacgregor@irobot.com>
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Andy 2022-07-26 10:53:19 -04:00 committed by GitHub
parent 841f4610d0
commit e88f32d565
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1 changed files with 10 additions and 1 deletions
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11
CMakeLists.txt
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@ -15,13 +15,22 @@ project(etl VERSION ${ETL_VERSION})
option(BUILD_TESTS "Build unit tests" OFF)
option(NO_STL "No STL" OFF)
# There is a bug on old gcc versions for some targets that causes all system headers
# to be implicitly wrapped with 'extern "C"'
# Users can add set(NO_SYSTEM_INCLUDE ON) to their top level CMakeLists.txt to work around this.
option(NO_SYSTEM_INCLUDE "Do not include with -isystem" OFF)
if (NO_SYSTEM_INCLUDE)
set(INCLUDE_SPECIFIER "")
else()
set(INCLUDE_SPECIFIER "SYSTEM")
endif()
add_library(${PROJECT_NAME} INTERFACE)
# This allows users which use the add_subdirectory or FetchContent
# to use the same target as users which use find_package
add_library(etl::etl ALIAS ${PROJECT_NAME})
target_include_directories(${PROJECT_NAME} SYSTEM INTERFACE
target_include_directories(${PROJECT_NAME} ${INCLUDE_SPECIFIER} INTERFACE
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)