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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/92860] [8/9/10 regression] Global flags
 affected by -O settings are clobbered by optimize attribute
Date: Wed, 18 Mar 2020 10:57:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D92860

--- Comment #15 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
(In reply to Martin Li=C5=A1ka from comment #14)
> There's another issue for ppc64le:
>=20
> $ ./xgcc -B.
> /home/marxin/Programming/gcc/gcc/testsuite/c-c++-common/attributes-3.c
> Error: global_options are modified in local context:
>   unroll_only_small_loops (0/1)
> /home/marxin/Programming/gcc/gcc/testsuite/c-c++-common/attributes-3.c:9:=
1:
> internal compiler error: in handle_optimize_attribute, at
> c-family/c-attribs.c:4464
>     9 | extern void __attribute__((optimize ("O2"))) fn0 (void); /* {
> dg-warning "optimization attribute" } */
>       | ^~~~~~
> 0xa98687 handle_optimize_attribute
> 	/home/marxin/Programming/gcc/gcc/c-family/c-attribs.c:4464
> 0x8e6dba decl_attributes(tree_node**, tree_node*, int, tree_node*)
> 	/home/marxin/Programming/gcc/gcc/attribs.c:713
> 0x8fc617 c_decl_attributes
> 	/home/marxin/Programming/gcc/gcc/c/c-decl.c:4977
> 0x8fcb61 start_decl(c_declarator*, c_declspecs*, bool, tree_node*)
> 	/home/marxin/Programming/gcc/gcc/c/c-decl.c:5116
> 0x96c7d4 c_parser_declaration_or_fndef
> 	/home/marxin/Programming/gcc/gcc/c/c-parser.c:2272
> 0x96b434 c_parser_external_declaration
> 	/home/marxin/Programming/gcc/gcc/c/c-parser.c:1746
> 0x96af96 c_parser_translation_unit
> 	/home/marxin/Programming/gcc/gcc/c/c-parser.c:1619
> 0x9a8e51 c_parse_file()
> 	/home/marxin/Programming/gcc/gcc/c/c-parser.c:21710
> 0xa262f8 c_common_parse_file()
> 	/home/marxin/Programming/gcc/gcc/c-family/c-opts.c:1186
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <https://gcc.gnu.org/bugs/> for instructions.

I've got a patch candidate for this particular issue. It can be fixed in a
reasonable way.=