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gdb/gdb-bfd-aliasing.patch
Petr Šabata b774b86094 RHEL 9.0.0 Alpha bootstrap 
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with the following as its source:
https://src.fedoraproject.org/rpms/gdb#6aff62077bcb16ebf2ba3c498634bce35eda276b
2020-10-15 00:46:23 +02:00

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http://sourceware.org/ml/binutils/2016-03/msg00119.html
Subject: [patch] aout+coff: Fix strict-aliasing rules error
--IJpNTDwzlM2Ie8A6
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Hi,
https://bugzilla.redhat.com/show_bug.cgi?id=1315191 by Dan Horak
gcc (GCC) 6.0.0 20160308 (experimental)
gcc-6.0.0-0.15.fc24
gcc-6.0.0-0.15.fc25
It did compile with:
gcc-6.0.0-0.14.fc24
aoutx.h:2504:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
int type_code = aout_symbol (symbol)->type & 0xff;
^~~
coffcode.h:1817:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
coffsymbol (section->symbol)->native = native;
^~~~~~~~~~
Full log attached.
This fix is probably wrong as it drops the type safety. But ({ statements as
expressions }) are probably not allowed in GDB.
Jan
--IJpNTDwzlM2Ie8A6
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bfd/
2016-03-08 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix strict-aliasing rules compilation error.
* libaout.h (aout_symbol): Remove type safe indirection.
* libcoff-in.h (coffsymbol): Likewise.
* libcoff.h: Regenerate.
diff --git a/bfd/libaout.h b/bfd/libaout.h
index 8b70a9f..b60c40c 100644
--- a/bfd/libaout.h
+++ b/bfd/libaout.h
@@ -448,9 +448,7 @@ struct aout_data_struct
#define obj_aout_sym_hashes(bfd) (adata (bfd).sym_hashes)
#define obj_aout_dynamic_info(bfd) (adata (bfd).dynamic_info)
-/* We take the address of the first element of an asymbol to ensure that the
- macro is only ever applied to an asymbol. */
-#define aout_symbol(asymbol) ((aout_symbol_type *)(&(asymbol)->the_bfd))
+#define aout_symbol(asymbol) ((aout_symbol_type *) (asymbol))
/* Information we keep for each a.out section. This is currently only
used by the a.out backend linker. */
diff --git a/bfd/libcoff-in.h b/bfd/libcoff-in.h
index 80f999d..fa1e9ac 100644
--- a/bfd/libcoff-in.h
+++ b/bfd/libcoff-in.h
@@ -188,9 +188,7 @@ struct xcoff_tdata
#define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
-/* We take the address of the first element of an asymbol to ensure that the
- macro is only ever applied to an asymbol. */
-#define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
+#define coffsymbol(asymbol) ((coff_symbol_type *) (asymbol))
/* Tdata for sections in XCOFF files. This is used by the linker. */
diff --git a/bfd/libcoff.h b/bfd/libcoff.h
index bbed3e0..8ce525b 100644
--- a/bfd/libcoff.h
+++ b/bfd/libcoff.h
@@ -192,9 +192,7 @@ struct xcoff_tdata
#define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
-/* We take the address of the first element of an asymbol to ensure that the
- macro is only ever applied to an asymbol. */
-#define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
+#define coffsymbol(asymbol) ((coff_symbol_type *) (asymbol))
/* Tdata for sections in XCOFF files. This is used by the linker. */
--IJpNTDwzlM2Ie8A6
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libtool: compile: gcc -DHAVE_CONFIG_H -I. -I. -I. -I./../include -DHAVE_x86_64_elf64_vec -DHAVE_i386_elf32_vec -DHAVE_iamcu_elf32_vec -DHAVE_x86_64_elf32_vec -DHAVE_i386_aout_linux_vec -DHAVE_i386_pei_vec -DHAVE_x86_64_pei_vec -DHAVE_l1om_elf64_vec -DHAVE_k1om_elf64_vec -DHAVE_elf64_le_vec -DHAVE_elf64_be_vec -DHAVE_elf32_le_vec -DHAVE_elf32_be_vec -DHAVE_plugin_vec -DBINDIR=\"/usr/local/bin\" -W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Werror -I./../zlib -g -O2 -MT aout32.lo -MD -MP -MF .deps/aout32.Tpo -c aout32.c -o aout32.o
In file included from aout32.c:24:0:
aoutx.h: In function $B!F(Baout_32_write_syms$B!G(B:
aoutx.h:1871:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
H_PUT_16 (abfd, aout_symbol (g)->desc, nsp.e_desc);
^~~~~~~~
aoutx.h:1872:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
H_PUT_8 (abfd, aout_symbol (g)->other, nsp.e_other);
^~~~~~~
aoutx.h:1873:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
H_PUT_8 (abfd, aout_symbol (g)->type, nsp.e_type);
^~~~~~~
aoutx.h: In function $B!F(Baout_32_get_symbol_info$B!G(B:
aoutx.h:2504:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
int type_code = aout_symbol (symbol)->type & 0xff;
^~~
aoutx.h:2515:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
ret->stab_other = (unsigned) (aout_symbol (symbol)->other & 0xff);
^~~
aoutx.h:2516:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
ret->stab_desc = (unsigned) (aout_symbol (symbol)->desc & 0xffff);
^~~
aoutx.h: In function $B!F(Baout_32_print_symbol$B!G(B:
aoutx.h:2537:9: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
(unsigned) (aout_symbol (symbol)->desc & 0xffff),
^
aoutx.h:2538:9: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
(unsigned) (aout_symbol (symbol)->other & 0xff),
^
aoutx.h:2539:9: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
(unsigned) (aout_symbol (symbol)->type));
^
aoutx.h:2549:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
(unsigned) (aout_symbol (symbol)->desc & 0xffff),
^
aoutx.h:2550:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
(unsigned) (aout_symbol (symbol)->other & 0xff),
^
aoutx.h:2551:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
(unsigned) (aout_symbol (symbol)->type & 0xff));
^
cc1: all warnings being treated as errors
libtool: compile: gcc -DHAVE_CONFIG_H -I. -I. -I. -I./../include -DHAVE_x86_64_elf64_vec -DHAVE_i386_elf32_vec -DHAVE_iamcu_elf32_vec -DHAVE_x86_64_elf32_vec -DHAVE_i386_aout_linux_vec -DHAVE_i386_pei_vec -DHAVE_x86_64_pei_vec -DHAVE_l1om_elf64_vec -DHAVE_k1om_elf64_vec -DHAVE_elf64_le_vec -DHAVE_elf64_be_vec -DHAVE_elf32_le_vec -DHAVE_elf32_be_vec -DHAVE_plugin_vec -DBINDIR=\"/usr/local/bin\" -W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Werror -I./../zlib -g -O2 -MT pei-i386.lo -MD -MP -MF .deps/pei-i386.Tpo -c pei-i386.c -o pei-i386.o
In file included from coff-i386.c:614:0,
from pei-i386.c:45:
coffcode.h: In function $B!F(Bcoff_new_section_hook$B!G(B:
coffcode.h:1817:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
coffsymbol (section->symbol)->native = native;
^~~~~~~~~~
cc1: all warnings being treated as errors
libtool: compile: gcc -DHAVE_CONFIG_H -I. -I. -I. -I./../include -DHAVE_x86_64_elf64_vec -DHAVE_i386_elf32_vec -DHAVE_iamcu_elf32_vec -DHAVE_x86_64_elf32_vec -DHAVE_i386_aout_linux_vec -DHAVE_i386_pei_vec -DHAVE_x86_64_pei_vec -DHAVE_l1om_elf64_vec -DHAVE_k1om_elf64_vec -DHAVE_elf64_le_vec -DHAVE_elf64_be_vec -DHAVE_elf32_le_vec -DHAVE_elf32_be_vec -DHAVE_plugin_vec -DBINDIR=\"/usr/local/bin\" -W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Werror -I./../zlib -g -O2 -MT coffgen.lo -MD -MP -MF .deps/coffgen.Tpo -c coffgen.c -o coffgen.o
coffgen.c: In function $B!F(Bcoff_get_lineno$B!G(B:
coffgen.c:1510:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
return coffsymbol (symbol)->lineno;
^~~~~~
coffgen.c: In function $B!F(Bcoff_get_symbol_info$B!G(B:
coffgen.c:2034:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
if (coffsymbol (symbol)->native != NULL
^~
coffgen.c:2035:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
&& coffsymbol (symbol)->native->fix_value
^~
coffgen.c:2036:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
&& coffsymbol (symbol)->native->is_sym)
^~
coffgen.c:2037:5: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
ret->value = coffsymbol (symbol)->native->u.syment.n_value -
^~~
coffgen.c: In function $B!F(Bcoff_print_symbol$B!G(B:
coffgen.c:2059:9: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
coffsymbol (symbol)->native ? "n" : "g",
^~~~~~~~~~
coffgen.c:2060:9: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
coffsymbol (symbol)->lineno ? "l" : " ");
^~~~~~~~~~
coffgen.c:2064:7: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
if (coffsymbol (symbol)->native)
^~
coffgen.c:2068:4: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
combined_entry_type *combined = coffsymbol (symbol)->native;
^~~~~~~~~~~~~~~~~~~
coffgen.c:2070:11: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
struct lineno_cache_entry *l = coffsymbol (symbol)->lineno;
^~~~~~~~~~~~~~~~~~
coffgen.c:2191:6: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
coffsymbol (symbol)->native ? "n" : "g",
^~~~~~~~~~
coffgen.c:2192:6: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
coffsymbol (symbol)->lineno ? "l" : " ",
^~~~~~~~~~
cc1: all warnings being treated as errors
libtool: compile: gcc -DHAVE_CONFIG_H -I. -I. -I. -I./../include -DHAVE_x86_64_elf64_vec -DHAVE_i386_elf32_vec -DHAVE_iamcu_elf32_vec -DHAVE_x86_64_elf32_vec -DHAVE_i386_aout_linux_vec -DHAVE_i386_pei_vec -DHAVE_x86_64_pei_vec -DHAVE_l1om_elf64_vec -DHAVE_k1om_elf64_vec -DHAVE_elf64_le_vec -DHAVE_elf64_be_vec -DHAVE_elf32_le_vec -DHAVE_elf32_be_vec -DHAVE_plugin_vec -DBINDIR=\"/usr/local/bin\" -W -Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Werror -I./../zlib -g -O2 -MT pei-x86_64.lo -MD -MP -MF .deps/pei-x86_64.Tpo -c pei-x86_64.c -o pei-x86_64.o
In file included from coff-x86_64.c:741:0,
from pei-x86_64.c:763:
coffcode.h: In function $B!F(Bcoff_new_section_hook$B!G(B:
coffcode.h:1817:3: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
coffsymbol (section->symbol)->native = native;
^~~~~~~~~~
cc1: all warnings being treated as errors
--IJpNTDwzlM2Ie8A6--
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