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Allow it to use system library #1

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Allow it to use system library #1

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19 changes: 13 additions & 6 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -29,13 +29,20 @@ target_include_directories(${PROJECT_NAME} PUBLIC "include")
# Link required libraries
# --------------------------------------------------------------------------------------------------------

include(FetchContent)
find_path(EXPECTED_INCLUDE_DIRS "tl/expected.hpp")

FetchContent_Declare(expected GIT_REPOSITORY "https://github.com/TartanLlama/expected")

option(EXPECTED_BUILD_TESTS "" OFF)
option(EXPECTED_BUILD_PACKAGE "" OFF)
FetchContent_MakeAvailable(expected)
if(EXPECTED_INCLUDE_DIRS)
message(STATUS "Using system-installed tl::expected")
add_library(tl_expected INTERFACE)
target_include_directories(tl_expected INTERFACE ${EXPECTED_INCLUDE_DIRS})
add_library(tl::expected ALIAS tl_expected)
else()
message(STATUS "Fetching tl::expected from GitHub")
include(FetchContent)
FetchContent_Declare(expected GIT_REPOSITORY "https://github.com/TartanLlama/expected")
option(EXPECTED_BUILD_TESTS "" OFF)
option(EXPECTED_BUILD_PACKAGE "" OFF)
FetchContent_MakeAvailable(expected)

target_link_libraries(${PROJECT_NAME} PUBLIC tl::expected)

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