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Add new option to build p4c with LTO #3470

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merged 2 commits into from
Sep 3, 2022
Merged

Add new option to build p4c with LTO #3470

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5863bc2
Add new option to build p4c with LTO
davidbolvansky Aug 1, 2022
fa2918d
Warn if GCC used with LLD, switch to Gold
davidbolvansky Aug 1, 2022
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Warn if GCC used with LLD, switch to Gold
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@davidbolvansky
davidbolvansky committed Aug 1, 2022
commit fa2918d8e75cc1ec3b37fef7541ad31a3681426a
6 changes: 4 additions & 2 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -225,7 +225,8 @@ set(BUILD_LINK_WITH_LLD ON CACHE BOOL "Use LLD linker for build if available (ov
# Build with LTO
if (ENABLE_LTO AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
if (BUILD_LINK_WITH_LLD)
message(FATAL_ERROR "LLD does not work with GCC's LTO object format, set BUILD_LINK_WITH_LLD to OFF")
message(WARNING "LLD does not work with GCC's LTO object format, switching to Gold.")
set(BUILD_LINK_WITH_LLD OFF)
endif ()
add_cxx_compiler_option ("-flto")
endif ()
Expand All @@ -235,7 +236,8 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID STREQUAL "Clan
# This only works with modern versions of GCC.
if (BUILD_STATIC_RELEASE AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU" AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 8.0)
if (BUILD_LINK_WITH_LLD)
message(FATAL_ERROR "LLD does not work with GCC's LTO object format, set BUILD_LINK_WITH_LLD to OFF")
message(WARNING "LLD does not work with GCC's LTO object format, switching to Gold.")
set(BUILD_LINK_WITH_LLD OFF)
endif ()
add_cxx_compiler_option ("-flto")
endif ()
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