Removing GCC -Wunused-but-set-parameter from pragma block at the top of pybind11.h#3164

Merged

rwgk merged 17 commits intopybind:masterfrom

rwgk:pragma_block_rm_unused_but_set_param

Aug 6, 2021

Commits on Aug 6, 2021

Cleanup triggered by work on pragma for GCC -Wunused-but-set-parameter.
rwgk
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Backing out changes to eigen.h (to be worked on later).
rwgk
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Adding PYBIND11_WORKAROUND_INCORRECT_GCC_UNUSED_BUT_SET_PARAMETER in type_caster_base.h (apparently needed only for older GCCs).
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Apparently older compilers need a simpler overload for silence_unused_warnings().
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clang C++11 compatibility: removing constexpr
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Special case for MSVC 2017: `constexpr void` return
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Trying again without the silence_unused_warnings(const int *) overload.
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Separate macros for ALL_GCC, OLD_GCC_UNUSED_BUT_SET_PARAMETER
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Changing to __GNUC__ <= 2 (turning off)
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Refined condition for PYBIND11_WORKAROUND_INCORRECT_OLD_GCC_UNUSED_BUT_SET_PARAMETER.
rwgk
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Quick experiment trying out suggestion by @henryiii
rwgk
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Introducing macro: PYBIND11_INT_ARRAY_WORKING_AROUND_MSVC_CLANG_ISSUES
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Trying henryiii@ (void) expander idea.
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fix: apply simpler expression with fewer workarounds

henryiii
authored and
rwgk
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Purging new-but-already-obsoleted macro, made possible by @henryiii's commit.
rwgk
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Renaming `ALL_GCC` macro back to just `GCC` (because there is no `OLD` anymore, luckily).
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[actions skip] Adding "All GCC versions" to comment, to be clear about it.
rwgk
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