
For LoongArch, the toplevel library build is always aliased to one of the multilib variants. This patch installs it with the actual MULTISUBDIR (instead of ".") so that the headers can be reached by the compiler. This patch is an update of https://gcc.gnu.org/pipermail/gcc-patches/2023-September/629435.html libstdc++-v3/ChangeLog: * configure.host: Register t-loongarch in tmake_file. * config/cpu/loongarch/t-loongarch: New file. Manually refresh MULTISUBDIR with $(shell $(CXX) --print-multi-directory).
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AM_MAKEFLAGS += " MULTISUBDIR=/$(shell $(CXX) --print-multi-directory)"
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