* config/sparc/sol2.h (ASM_DECLARE_OBJECT_NAME): New. Emit
"tls_object" for thread-local objects.
* config/sparc/sparc.c (sparc_elf_asm_named_section): Emit
"#tls" for thread-local sections.
* configure.ac (thread-local checks): Specify --fatal-warnings in
every binutils-specific checks. For sparc*-*-*, test whether the
OS is Solaris and the tools are native and act accordingly.
* configure: Rebuild.