689dc63287
Following up onb13421011d"better data structures for some static const vars": * Make the o3tl::sorted_vector ctor taking an initializer_list constexpr. <https://wg21.link/P0202R3> "Add Constexpr Modifiers to Functions in <algorithm> and <utility> Headers", which will be in C++2a and is already implemented by recent libc++ and libstdc++ according to <https://en.cppreference.com/w/cpp/compiler_support #C.2B.2B2a_library_features>, makes std::sort constexpr but explicitly keeps std::stable_sort non-constexpr. ("Algorithms stable_partition, inplace_merge and stable_sort allocate memory, construct variables using placement new, use unique_ptr and do other things not acceptable in constexpr expressions. Making those algorithms constexpr seems to be a hard task that would require a lot of intrinsics. Those algorithms are not marked with constexpr in this wording.") But keep o3tl::sorted_vector::Resort (which was introduced inc59355e936"fdo#58793: re-implement SwpHintsArray::Resort()") using std::stable_sort instead of std::sort, in case that is relevant for its pre-exisiting uses. * <https://wg21.link/P1004R2> "Making std::vector constexpr", which was voted into C++2a according to <https://wg21.link/n4829> "Editors' Report -- Programming Languages -- C++", will make the relevant parts of std::vector constexpr. But none of libc++, libstdc++, and MSVC implement that as of now. * Introduce HAVE_CPP_CONSTINIT_SORTED_VECTOR to hide the constinit behind for now for the one case fromb13421011d"better data structures for some static const vars" that can clearly be constinit once constexpr std::vector is supported by compilers. The other three cases (s_aContainerDocumentCommands in chart2/source/controller/main/CommandDispatchContainer.cxx, aMetricCompatibleMap in vcl/source/font/PhysicalFontCollection.cxx, and aBlacklist in writerfilter/source/dmapper/PropertyMap.cxx) would each need a constexpr OUString first. (Technically, the constinit would not even be needed, but it nicely documents our intent that this will actually be initialized at compile-time once compilers support that.) Change-Id: Ibeb138f120528be3a7a09b3912143bf795fbab29 Reviewed-on: https://gerrit.libreoffice.org/79556 Tested-by: Jenkins Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
36 lines
1.2 KiB
C
36 lines
1.2 KiB
C
/*
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Global configuration file.
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Only for settings that apply to every source file and are unlikely to change often,
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such as whether a certain C++11 feature is available.
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Do NOT use for settings local to some code or for settings that can change often.
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Any change in this header will cause a rebuild of almost everything.
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*/
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#ifndef CONFIG_GLOBAL_H
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#define CONFIG_GLOBAL_H
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#define HAVE_GCC_BUILTIN_ATOMIC 0
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#define HAVE_GCC_BUILTIN_FFS 0
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/* _Pragma */
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#define HAVE_GCC_PRAGMA_OPERATOR 0
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#define HAVE_GCC_DEPRECATED_MESSAGE 0
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#define HAVE_SYSLOG_H 0
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/* Compiler supports __attribute__((warn_unused)). */
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#define HAVE_GCC_ATTRIBUTE_WARN_UNUSED 0
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/* Guaranteed copy elision (C++17), __cpp_guaranteed_copy_elision (C++2a): */
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#define HAVE_CPP_GUARANTEED_COPY_ELISION 0
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// Compiler supports all of C++2a <https://wg21.link/P0202R3> "Add Constexpr Modifiers to Functions
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// in <algorithm> and <utility> Headers", <https://wg21.link/P1004R2> "Making std::vector
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// constexpr", and <https://wg21.link/P1143R2> "Adding the constinit keyword":
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#define HAVE_CPP_CONSTINIT_SORTED_VECTOR 0
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/* GCC bug <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87150> "move ctor wrongly chosen in return
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stmt (derived vs. base)": */
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#define HAVE_GCC_BUG_87150 0
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#endif
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