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> Several older compilers fail to build modern GCC because of missing > or incomplete C++11 support. > > * config/i386/i386.h (struct stringop_algs): Define a CTOR for > this type. Unfortunately, as mentioned in my https://gcc.gnu.org/pipermail/gcc-patches/2021-November/583289.html mail, without the new dyninit pass this causes dynamic initialization of many variables, 6.5KB _GLOBAL__sub_I_* on x86_64 and 12.5KB on i686. The following patch makes the ctor constexpr so that already the FE is able to statically initialize all those. I have tested on godbolt a reduced testcase without a constructor, with constructor and with constexpr constructor. clang before 3.3 is unhappy about all the 3 cases, clang 3.3 and 3.4 is ok with ctor and ctor with constexpr and optimizes it into static initialization, clang 3.5+ is ok with all 3 versions and optimizes, gcc 4.8 and 5+ is ok with all 3 versions and no ctor and ctor with constexpr is optimized, gcc 4.9 is unhappy about the no ctor case and happy with the other two. 2021-11-05 Jakub Jelinek <jakub@redhat.com> PR bootstrap/100246 * config/i386/i386.h (stringop_algs::stringop_strategy::stringop_strategy): Make the ctor constexpr.
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