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build: use PROJECT_IS_TOP_LEVEL for the pkgconfig top-level guard #348

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build: use PROJECT_IS_TOP_LEVEL for the pkgconfig top-level guard #348

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12 changes: 11 additions & 1 deletion CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,16 @@ project(Graaf
LANGUAGES C CXX
)

# CMake >=3.21 sets this automatically; fall back to the equivalent check
# since this project's floor is CMake 3.11.
if(NOT DEFINED PROJECT_IS_TOP_LEVEL)
if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR)
set(PROJECT_IS_TOP_LEVEL TRUE)
else()
set(PROJECT_IS_TOP_LEVEL FALSE)
endif()
endif()

set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# This project uses C++ 20 features
Expand Down Expand Up @@ -43,7 +53,7 @@ install(
DIRECTORY "${PROJECT_SOURCE_DIR}/include/"
DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
)
if(CMAKE_SOURCE_DIR STREQUAL PROJECT_SOURCE_DIR) # Only if graalib is the top-level project (e.g. skip if obtained via FetchContent)
if(PROJECT_IS_TOP_LEVEL) # Skip if Graaf was obtained via FetchContent
configure_file(${CMAKE_SOURCE_DIR}/packaging/graaf.pc.in graaf.pc @ONLY)
install(
FILES ${CMAKE_CURRENT_BINARY_DIR}/graaf.pc
Expand Down