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cmake: Simplify PROJECT_IS_TOP_LEVEL emulation

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Detecting whether it is the top level by comparing the value of
`CMAKE_SOURCE_DIR` with `CMAKE_CURRENT_SOURCE_DIR` is supported by all
versions of CMake and is a very common pattern.
This commit is contained in:
Hennadii Stepanov
2024-05-11 11:13:41 +01:00
parent cae9a7ad14
commit ec4c002faa
1 changed files with 4 additions and 6 deletions
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10
CMakeLists.txt
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@@ -19,15 +19,13 @@ project(libsecp256k1
if(CMAKE_VERSION VERSION_LESS 3.21)
# Emulates CMake 3.21+ behavior.
get_directory_property(parent_directory PARENT_DIRECTORY)
if(parent_directory)
set(PROJECT_IS_TOP_LEVEL OFF)
set(${PROJECT_NAME}_IS_TOP_LEVEL OFF)
else()
if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
set(PROJECT_IS_TOP_LEVEL ON)
set(${PROJECT_NAME}_IS_TOP_LEVEL ON)
else()
set(PROJECT_IS_TOP_LEVEL OFF)
set(${PROJECT_NAME}_IS_TOP_LEVEL OFF)
endif()
unset(parent_directory)
endif()
# The library version is based on libtool versioning of the ABI. The set of