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PR lto/46944 * configure.ac (gcc_cv_gld_major_version, gcc_cv_gld_minor): Handle in-tree gold. (ld_vers): Extract binutils version for gold. (gcc_cv_ld_hidden): Handle gold here. (gcc_cv_lto_plugin): Determine level of linker plugin support. * configure: Regenerate. * config.in: Regenerate. * gcc.c: Only use LTO plugin if HAVE_LTO_PLUGIN > 0, reject -fuse-linker-plugin otherwise. (LINK_PLUGIN_SPEC): Define. Extract from LINK_COMMAND_SPEC. (LINK_COMMAND_SPEC): Use it. (main): Only look for LTOPLUGINSONAME if HAVE_LTO_PLUGIN > 0. From-SVN: r171039
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