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fix: ipo should be off for debug or relwithdebinfo (#2590)

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* fix: ipo should be off for debug or relwithdebinfo

Closes #2587

* docs: slightly more detailed about IPO

* Update pybind11Common.cmake
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Henry Schreiner 2020-10-14 13:43:31 -04:00 committed by GitHub
parent 3be085d194
commit a8c2e3eec5
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2 changed files with 12 additions and 3 deletions
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11
docs/compiling.rst
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@ -264,8 +264,15 @@ As stated above, LTO is enabled by default. Some newer compilers also support
different flavors of LTO such as `ThinLTO`_. Setting ``THIN_LTO`` will cause
the function to prefer this flavor if available. The function falls back to
regular LTO if ``-flto=thin`` is not available. If
``CMAKE_INTERPROCEDURAL_OPTIMIZATION`` is set (either ON or OFF), then that
will be respected instead of the built-in flag search.
``CMAKE_INTERPROCEDURAL_OPTIMIZATION`` is set (either ``ON`` or ``OFF``), then
that will be respected instead of the built-in flag search.
.. note::
If you want to set the property form on targets or the
``CMAKE_INTERPROCEDURAL_OPTIMIZATION_<CONFIG>`` versions of this, you should
still use ``set(CMAKE_INTERPROCEDURAL_OPTIMIZATION OFF)`` (otherwise a
no-op) to disable pybind11's ipo flags.
The ``OPT_SIZE`` flag enables size-based optimization equivalent to the
standard ``/Os`` or ``-Os`` compiler flags and the ``MinSizeRel`` build type,

4
tools/pybind11Common.cmake
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@ -327,7 +327,9 @@ function(_pybind11_generate_lto target prefer_thin_lto)
# Enable LTO flags if found, except for Debug builds
if(PYBIND11_LTO_CXX_FLAGS)
set(not_debug "$<NOT:$<CONFIG:Debug>>")
# CONFIG takes multiple values in CMake 3.19+, until then we have to use OR
set(is_debug "$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>")
set(not_debug "$<NOT:${is_debug}>")
set(cxx_lang "$<COMPILE_LANGUAGE:CXX>")
if(MSVC AND CMAKE_VERSION VERSION_LESS 3.11)
set(genex "${not_debug}")