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fix: ipo should be off for debug or relwithdebinfo (#2590)
* fix: ipo should be off for debug or relwithdebinfo Closes #2587 * docs: slightly more detailed about IPO * Update pybind11Common.cmake
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@ -264,8 +264,15 @@ As stated above, LTO is enabled by default. Some newer compilers also support
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different flavors of LTO such as `ThinLTO`_. Setting ``THIN_LTO`` will cause
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different flavors of LTO such as `ThinLTO`_. Setting ``THIN_LTO`` will cause
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the function to prefer this flavor if available. The function falls back to
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the function to prefer this flavor if available. The function falls back to
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regular LTO if ``-flto=thin`` is not available. If
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regular LTO if ``-flto=thin`` is not available. If
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``CMAKE_INTERPROCEDURAL_OPTIMIZATION`` is set (either ON or OFF), then that
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``CMAKE_INTERPROCEDURAL_OPTIMIZATION`` is set (either ``ON`` or ``OFF``), then
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will be respected instead of the built-in flag search.
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that will be respected instead of the built-in flag search.
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.. note::
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If you want to set the property form on targets or the
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``CMAKE_INTERPROCEDURAL_OPTIMIZATION_<CONFIG>`` versions of this, you should
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still use ``set(CMAKE_INTERPROCEDURAL_OPTIMIZATION OFF)`` (otherwise a
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no-op) to disable pybind11's ipo flags.
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The ``OPT_SIZE`` flag enables size-based optimization equivalent to the
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The ``OPT_SIZE`` flag enables size-based optimization equivalent to the
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standard ``/Os`` or ``-Os`` compiler flags and the ``MinSizeRel`` build type,
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standard ``/Os`` or ``-Os`` compiler flags and the ``MinSizeRel`` build type,
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@ -327,7 +327,9 @@ function(_pybind11_generate_lto target prefer_thin_lto)
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# Enable LTO flags if found, except for Debug builds
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# Enable LTO flags if found, except for Debug builds
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if(PYBIND11_LTO_CXX_FLAGS)
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if(PYBIND11_LTO_CXX_FLAGS)
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set(not_debug "$<NOT:$<CONFIG:Debug>>")
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# CONFIG takes multiple values in CMake 3.19+, until then we have to use OR
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set(is_debug "$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>")
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set(not_debug "$<NOT:${is_debug}>")
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set(cxx_lang "$<COMPILE_LANGUAGE:CXX>")
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set(cxx_lang "$<COMPILE_LANGUAGE:CXX>")
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if(MSVC AND CMAKE_VERSION VERSION_LESS 3.11)
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if(MSVC AND CMAKE_VERSION VERSION_LESS 3.11)
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set(genex "${not_debug}")
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set(genex "${not_debug}")
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