On Thu, Feb 6, 2020 at 6:57 PM H.J. Lu <hjl.to...@gmail.com> wrote: > > This commit in GNU binutils 2.35: > > https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=b7d072167715829eed0622616f6ae0182900de3e > > added the section flag 'o' to .section directive: > > .section __patchable_function_entries,"awo",@progbits,foo > > which specifies the symbol name which the section references. Assembler > creates a unique __patchable_function_entries section with the section, > where foo is defined, as its linked-to section. Linker keeps a section > if its linked-to section is kept during garbage collection. > > This patch checks assembler support for the section flag 'o' and uses > it to implement __patchable_function_entries section. Since Solaris may > use GNU assembler with Solairs ld. Even if GNU assembler supports the > section flag 'o', it doesn't mean that Solairs ld supports it. This > feature is disabled for Solairs targets. > > gcc/ > > PR middle-end/93195 > PR middle-end/93197 > * configure.ac (HAVE_GAS_SECTION_LINK_ORDER): New. Define if > the assembler supports the section flag 'o' for specifying > section with link-order. > * dwarf2out.c (output_comdat_type_unit): Pass 0 as flags2 > to targetm.asm_out.named_section. > * config/sol2.c (solaris_elf_asm_comdat_section): Likewise. > * output.h (SECTION2_LINK_ORDER): New. > (switch_to_section): Add an unsigned int argument. > (default_no_named_section): Likewise. > (default_elf_asm_named_section): Likewise. > * target.def (asm_out.named_section): Likewise. > * targhooks.c (default_print_patchable_function_entry): Pass > current_function_decl to get_section and SECTION2_LINK_ORDER > to switch_to_section. > * varasm.c (default_no_named_section): Add an unsigned int > argument. > (default_elf_asm_named_section): Add an unsigned int argument, > flags2. Use 'o' flag for SECTION2_LINK_ORDER if assembler > supports it. > (switch_to_section): Add an unsigned int argument and pass it > to targetm.asm_out.named_section. > (handle_vtv_comdat_section): Pass 0 to > targetm.asm_out.named_section. > * config.in: Regenerated. > * configure: Likewise. > * doc/tm.texi: Likewise. > > gcc/testsuite/ > > PR middle-end/93195 > * g++.dg/pr93195a.C: New test. > * g++.dg/pr93195b.C: Likewise. > * lib/target-supports.exp > (check_effective_target_o_flag_in_section): New proc.
PING https://gcc.gnu.org/pipermail/gcc-patches/2020-February/539963.html -- H.J.
