* Makefile.in (libgcc.mk): Pass SHLIB_EXT, not SHLIB_LIBS.
        * configure.in (sparc*-*-solaris*): Use t-slibgcc{,-sld}.
        * mklibgcc.in: Consider SHLIB_LINK the entire shlib build command.
        Use SHLIB_EXT.

        * config/t-linux (SHLIB_EXT): New.
        (SHLIB_LINK): Use the entire build command, with substitutions.
        (SHLIB_LIBS): Remove.
        * config/alpha/t-osf4: Likewise.
        * config/mips/t-iris6: Likewise.
        * config/sparc/t-sol2: Likewise, but move shlib stuff...
        * config/sparc/t-slibgcc-sld: ...here.
        * config/sparc/t-slibgcc: New file.

From-SVN: r36792