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IPO/LTO support for ICX (IntelLLVM) compiler (#4402) 

* IPO/LTO support for ICX (IntelLLVM) compiler

https://github.com/pybind/pybind11/issues/4080

* style: pre-commit fixes

* Add WARNING/HELP WANTED comment.

Co-authored-by: Martin Blanchard <martin.blanchard@siemens.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Ralf W. Grosse-Kunstleve <rwgk@google.com>
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Martin Blanchard 2022-12-16 06:10:46 +01:00 committed by GitHub
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10
tools/pybind11Common.cmake
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@ -311,6 +311,16 @@ function(_pybind11_generate_lto target prefer_thin_lto)
HAS_FLTO "-flto${cxx_append}" "-flto${linker_append}" PYBIND11_LTO_CXX_FLAGS
PYBIND11_LTO_LINKER_FLAGS)
endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "IntelLLVM")
# IntelLLVM equivalent to LTO is called IPO; also IntelLLVM is WIN32/UNIX
# WARNING/HELP WANTED: This block of code is currently not covered by pybind11 GitHub Actions!
if(WIN32)
_pybind11_return_if_cxx_and_linker_flags_work(
HAS_INTEL_IPO "-Qipo" "-Qipo" PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
else()
_pybind11_return_if_cxx_and_linker_flags_work(
HAS_INTEL_IPO "-ipo" "-ipo" PYBIND11_LTO_CXX_FLAGS PYBIND11_LTO_LINKER_FLAGS)
endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
# Intel equivalent to LTO is called IPO
_pybind11_return_if_cxx_and_linker_flags_work(HAS_INTEL_IPO "-ipo" "-ipo"