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Significantly improve macos build times (i.e., github actions) #3033

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Merged
galabovaa merged 2 commits into from
May 20, 2026
Merged

Significantly improve macos build times (i.e., github actions) #3033

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2ff2ea3
Trying unity build on libhighs to signifcantly improve link times on …
mathgeekcoder May 19, 2026
4d6fc81
Add to FAST_BUILD=OFF too
mathgeekcoder May 19, 2026
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23 changes: 22 additions & 1 deletion highs/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,17 @@ if(NOT FAST_BUILD)
add_library(libhighs ${sources} ${headers} ${win_version_file})
target_include_directories(libhighs PRIVATE ${include_dirs})

if(APPLE)
# linker was taking ~1 hour, unity build reduces it to ~1 minute
set_target_properties(libhighs PROPERTIES
UNITY_BUILD ON
UNITY_BUILD_BATCH_SIZE 8)

if(NOT CMAKE_VERSION VERSION_LESS 3.20)
set_target_properties(libhighs PROPERTIES UNITY_BUILD_UNIQUE_ID "HIGHS_UNITY_ID")
endif()
endif()

if(${BUILD_SHARED_LIBS})
# put version information into shared library file
set_target_properties(libhighs PROPERTIES
Expand Down Expand Up @@ -132,9 +143,19 @@ else()
# Define library in modern CMake using target_*()
# No interfaces (apart from c); No ipx; New (short) ctest instances.
add_library(highs)

add_library(${PROJECT_NAMESPACE}::highs ALIAS highs)

if(APPLE)
# linker was taking ~1 hour, unity build reduces it to ~1 minute
set_target_properties(highs PROPERTIES
UNITY_BUILD ON
UNITY_BUILD_BATCH_SIZE 8)

if(NOT CMAKE_VERSION VERSION_LESS 3.20)
set_target_properties(highs PROPERTIES UNITY_BUILD_UNIQUE_ID "HIGHS_UNITY_ID")
endif()
endif()

if(${BUILD_SHARED_LIBS})
# put version information into shared library file
set_target_properties(highs PROPERTIES
Expand Down
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