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cmake: use -flto=auto compiler flag when supported #1571

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Mar 3, 2025
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cmake: use -flto=auto compiler flag when supported #1571

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8 changes: 6 additions & 2 deletions cmake/DaemonFlags.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -420,9 +420,13 @@ else()
# Saigo NaCl compiler doesn't support LTO, the flag is accepted but linking fails
# with “unable to pass LLVM bit-code files to linker” error.
if (USE_LTO AND NOT NACL)
try_c_cxx_flag(LTO "-flto")
try_c_cxx_flag(LTO_AUTO "-flto=auto")

if (FLAG_LTO)
if (NOT FLAG_LTO_AUTO)
try_c_cxx_flag(LTO "-flto")
endif()

if (FLAG_LTO_AUTO OR FLAG_LTO)
# Pass all compile flags to the linker.
set_linker_flag("${CMAKE_CXX_FLAGS}")

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