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Enable interprocedural optimization #326

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Enable interprocedural optimization #326

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fd995f3
Enable interprocedural optimization
Komzpa Mar 26, 2020
105def3
Enable portable LTO static archives
Komzpa May 4, 2026
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26 changes: 26 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,19 @@ if(ENABLE_WARNINGS)
endif()
endif()

option(ENABLE_LTO "Enable interprocedural optimization for Release builds." ON)
if(ENABLE_LTO)
include(CheckIPOSupported)
check_ipo_supported(RESULT H3_IPO_SUPPORTED
OUTPUT H3_IPO_CHECK_OUTPUT
LANGUAGES C)
if(H3_IPO_SUPPORTED)
set(CMAKE_INTERPROCEDURAL_OPTIMIZATION_RELEASE ON)
else()
message(STATUS "IPO/LTO is not supported: ${H3_IPO_CHECK_OUTPUT}")
endif()
endif()

if(NOT MSVC)
# Compiler options are set only on non-Windows, since these options are not
# correct for MSVC.
Expand Down Expand Up @@ -368,6 +381,19 @@ function(add_h3_library name h3_alloc_prefix_override)
target_compile_options(${name} PRIVATE ${H3_COMPILE_FLAGS})
target_link_libraries(${name} PRIVATE ${H3_LINK_FLAGS})
target_compile_features(${name} PUBLIC c_std_99)
if(ENABLE_LTO AND H3_IPO_SUPPORTED AND NOT BUILD_SHARED_LIBS)
if(MSVC OR CMAKE_C_COMPILER_ID MATCHES "Clang")
set_target_properties(
${name} PROPERTIES INTERPROCEDURAL_OPTIMIZATION_RELEASE OFF)
endif()
endif()
if(ENABLE_LTO AND H3_IPO_SUPPORTED AND NOT BUILD_SHARED_LIBS AND NOT MSVC)
target_compile_options(
${name}
PRIVATE
$<$<AND:$<CONFIG:Release>,$<COMPILE_LANG_AND_ID:C,GNU>>:-ffat-lto-objects>
)
endif()

find_library(M_LIB m)
if(NOT(M_LIB))
Expand Down