Add ability to warn about multibyte characters in the assembler. (#2018848)
This commit is contained in:
Nick Clifton
parent
1524ef5833
commit
620973c050
384
binutils-gas-multibyte-warnings.patch
Normal file
384
binutils-gas-multibyte-warnings.patch
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@ -0,0 +1,384 @@
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diff -rupN binutils.orig/gas/NEWS binutils-2.37/gas/NEWS
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--- binutils.orig/gas/NEWS 2021-11-18 16:50:39.104088534 +0000
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+++ binutils-2.37/gas/NEWS 2021-11-18 16:51:16.340948280 +0000
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@@ -1,5 +1,13 @@
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-*- text -*-
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+* The --multibyte-handling=[allow|warn|warn-sym-only] option tells the
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+ assembler what to when it encoutners multibyte characters in the input. The
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+ default is to allow them. Setting the option to "warn" will generate a
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+ warning message whenever any multibyte character is encountered. Using the
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+ option to "warn-sym-only" will make the assembler generate a warning whenever a
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+ symbol is defined containing multibyte characters. (References to undefined
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+ symbols will not generate warnings).
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+
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Changes in 2.37:
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* arm-symbianelf support removed.
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diff -rupN binutils.orig/gas/app.c binutils-2.37/gas/app.c
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--- binutils.orig/gas/app.c 2021-11-18 16:50:39.104088534 +0000
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+++ binutils-2.37/gas/app.c 2021-11-18 16:50:42.530075630 +0000
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@@ -345,6 +345,55 @@ process_escape (int ch)
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}
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}
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+#define MULTIBYTE_WARN_COUNT_LIMIT 10
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+static unsigned int multibyte_warn_count = 0;
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+
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+bool
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+scan_for_multibyte_characters (const unsigned char * start,
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+ const unsigned char * end,
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+ bool warn)
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+{
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+ if (end <= start)
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+ return false;
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+
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+ if (warn && multibyte_warn_count > MULTIBYTE_WARN_COUNT_LIMIT)
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+ return false;
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+
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+ bool found = false;
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+
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+ while (start < end)
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+ {
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+ unsigned char c;
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+
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+ if ((c = * start++) <= 0x7f)
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+ continue;
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+
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+ if (!warn)
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+ return true;
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+
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+ found = true;
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+
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+ const char * filename;
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+ unsigned int lineno;
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+
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+ filename = as_where (& lineno);
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+ if (filename == NULL)
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+ as_warn (_("multibyte character (%#x) encountered in input"), c);
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+ else if (lineno == 0)
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+ as_warn (_("multibyte character (%#x) encountered in %s"), c, filename);
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+ else
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+ as_warn (_("multibyte character (%#x) encountered in %s at or near line %u"), c, filename, lineno);
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+
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+ if (++ multibyte_warn_count == MULTIBYTE_WARN_COUNT_LIMIT)
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+ {
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+ as_warn (_("further multibyte character warnings suppressed"));
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+ break;
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+ }
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+ }
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+
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+ return found;
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+}
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+
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/* This function is called to process input characters. The GET
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parameter is used to retrieve more input characters. GET should
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set its parameter to point to a buffer, and return the length of
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@@ -463,6 +512,11 @@ do_scrub_chars (size_t (*get) (char *, s
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return 0;
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from = input_buffer;
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fromend = from + fromlen;
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+
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+ if (multibyte_handling == multibyte_warn)
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+ (void) scan_for_multibyte_characters ((const unsigned char *) from,
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+ (const unsigned char* ) fromend,
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+ true /* Generate warnings. */);
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}
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while (1)
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diff -rupN binutils.orig/gas/as.c binutils-2.37/gas/as.c
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--- binutils.orig/gas/as.c 2021-11-18 16:50:39.104088534 +0000
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+++ binutils-2.37/gas/as.c 2021-11-18 16:50:42.531075627 +0000
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@@ -474,7 +474,7 @@ parse_args (int * pargc, char *** pargv)
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OPTION_DEBUG_PREFIX_MAP,
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OPTION_DEFSYM,
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OPTION_LISTING_LHS_WIDTH,
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- OPTION_LISTING_LHS_WIDTH2,
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+ OPTION_LISTING_LHS_WIDTH2, /* = STD_BASE + 10 */
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OPTION_LISTING_RHS_WIDTH,
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OPTION_LISTING_CONT_LINES,
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OPTION_DEPFILE,
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@@ -484,7 +484,7 @@ parse_args (int * pargc, char *** pargv)
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OPTION_GDWARF_3,
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OPTION_GDWARF_4,
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OPTION_GDWARF_5,
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- OPTION_GDWARF_SECTIONS,
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+ OPTION_GDWARF_SECTIONS, /* = STD_BASE + 20 */
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OPTION_GDWARF_CIE_VERSION,
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OPTION_STRIP_LOCAL_ABSOLUTE,
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OPTION_TRADITIONAL_FORMAT,
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@@ -494,7 +494,7 @@ parse_args (int * pargc, char *** pargv)
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OPTION_NOEXECSTACK,
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OPTION_SIZE_CHECK,
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OPTION_ELF_STT_COMMON,
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- OPTION_ELF_BUILD_NOTES,
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+ OPTION_ELF_BUILD_NOTES, /* = STD_BASE + 30 */
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OPTION_SECTNAME_SUBST,
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OPTION_ALTERNATE,
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OPTION_AL,
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@@ -503,7 +503,8 @@ parse_args (int * pargc, char *** pargv)
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OPTION_WARN_FATAL,
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OPTION_COMPRESS_DEBUG,
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OPTION_NOCOMPRESS_DEBUG,
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- OPTION_NO_PAD_SECTIONS /* = STD_BASE + 40 */
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+ OPTION_NO_PAD_SECTIONS,
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+ OPTION_MULTIBYTE_HANDLING /* = STD_BASE + 40 */
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/* When you add options here, check that they do
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not collide with OPTION_MD_BASE. See as.h. */
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};
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@@ -581,6 +582,7 @@ parse_args (int * pargc, char *** pargv)
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,{"target-help", no_argument, NULL, OPTION_TARGET_HELP}
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,{"traditional-format", no_argument, NULL, OPTION_TRADITIONAL_FORMAT}
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,{"warn", no_argument, NULL, OPTION_WARN}
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+ ,{"multibyte-handling", required_argument, NULL, OPTION_MULTIBYTE_HANDLING}
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};
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/* Construct the option lists from the standard list and the target
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@@ -683,6 +685,19 @@ parse_args (int * pargc, char *** pargv)
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flag_traditional_format = 1;
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break;
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+ case OPTION_MULTIBYTE_HANDLING:
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+ if (strcmp (optarg, "allow") == 0)
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+ multibyte_handling = multibyte_allow;
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+ else if (strcmp (optarg, "warn") == 0)
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+ multibyte_handling = multibyte_warn;
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+ else if (strcmp (optarg, "warn-sym-only") == 0)
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+ multibyte_handling = multibyte_warn_syms;
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+ else if (strcmp (optarg, "warn_sym_only") == 0)
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+ multibyte_handling = multibyte_warn_syms;
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+ else
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+ as_fatal (_("unexpected argument to --multibyte-input-option: '%s'"), optarg);
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+ break;
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+
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case OPTION_VERSION:
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/* This output is intended to follow the GNU standards document. */
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printf (_("GNU assembler %s\n"), BFD_VERSION_STRING);
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diff -rupN binutils.orig/gas/as.h binutils-2.37/gas/as.h
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--- binutils.orig/gas/as.h 2021-11-18 16:50:38.834089551 +0000
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+++ binutils-2.37/gas/as.h 2021-11-18 16:50:42.531075627 +0000
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@@ -344,6 +344,14 @@ COMMON int linkrelax;
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COMMON int do_not_pad_sections_to_alignment;
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+enum multibyte_input_handling
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+{
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+ multibyte_allow = 0,
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+ multibyte_warn,
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+ multibyte_warn_syms
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+};
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+COMMON enum multibyte_input_handling multibyte_handling;
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+
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/* TRUE if we should produce a listing. */
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extern int listing;
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@@ -450,6 +458,7 @@ void input_scrub_insert_file (char *);
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char * input_scrub_new_file (const char *);
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char * input_scrub_next_buffer (char **bufp);
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size_t do_scrub_chars (size_t (*get) (char *, size_t), char *, size_t);
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+bool scan_for_multibyte_characters (const unsigned char *, const unsigned char *, bool);
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int gen_to_words (LITTLENUM_TYPE *, int, long);
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int had_err (void);
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int ignore_input (void);
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diff -rupN binutils.orig/gas/doc/as.texi binutils-2.37/gas/doc/as.texi
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--- binutils.orig/gas/doc/as.texi 2021-11-18 16:50:38.838089536 +0000
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+++ binutils-2.37/gas/doc/as.texi 2021-11-18 16:50:42.535075612 +0000
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@@ -245,6 +245,7 @@ gcc(1), ld(1), and the Info entries for
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[@b{--sectname-subst}] [@b{--size-check=[error|warning]}]
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[@b{--elf-stt-common=[no|yes]}]
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[@b{--generate-missing-build-notes=[no|yes]}]
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+ [@b{--multibyte-handling=[allow|warn|warn-sym-only]}]
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[@b{--target-help}] [@var{target-options}]
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[@b{--}|@var{files} @dots{}]
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@c
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@@ -866,6 +867,18 @@ Set the maximum width of an input source
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Set the maximum number of lines printed in a listing for a single line of input
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to @var{number} + 1.
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+@item --multibyte-handling=allow
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+@itemx --multibyte-handling=warn
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+@itemx --multibyte-handling=warn-sym-only
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+Controls how the assembler handles multibyte characters in the input. The
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+default (which can be restored by using the @option{allow} argument) is to
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+allow such characters without complaint. Using the @option{warn} argument will
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+make the assembler generate a warning message whenever any multibyte character
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+is encountered. Using the @option{warn-sym-only} argument will only cause a
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+warning to be generated when a symbol is defined with a name that contains
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+multibyte characters. (References to undefined symbols will not generate a
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+warning).
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+
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@item --no-pad-sections
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Stop the assembler for padding the ends of output sections to the alignment
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of that section. The default is to pad the sections, but this can waste space
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@@ -2942,9 +2955,11 @@ are noted in @ref{Machine Dependencies}.
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@end ifset
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No symbol may begin with a digit. Case is significant.
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There is no length limit; all characters are significant. Multibyte characters
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-are supported. Symbols are delimited by characters not in that set, or by the
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-beginning of a file (since the source program must end with a newline, the end
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-of a file is not a possible symbol delimiter). @xref{Symbols}.
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+are supported, but note that the setting of the
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+@option{--multibyte-handling} option might prevent their use. Symbols
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+are delimited by characters not in that set, or by the beginning of a file
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+(since the source program must end with a newline, the end of a file is not a
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+possible symbol delimiter). @xref{Symbols}.
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Symbol names may also be enclosed in double quote @code{"} characters. In such
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cases any characters are allowed, except for the NUL character. If a double
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@@ -3834,11 +3849,18 @@ than @code{Foo}.
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Symbol names do not start with a digit. An exception to this rule is made for
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Local Labels. See below.
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-Multibyte characters are supported. To generate a symbol name containing
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+Multibyte characters are supported, but note that the setting of the
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+@option{multibyte-handling} option might prevent their use.
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+To generate a symbol name containing
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multibyte characters enclose it within double quotes and use escape codes. cf
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@xref{Strings}. Generating a multibyte symbol name from a label is not
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currently supported.
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+Since multibyte symbol names are unusual, and could possibly be used
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+maliciously, @command{@value{AS}} provides a command line option
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+(@option{--multibyte-handling=warn-sym-only}) which can be used to generate a
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+warning message whenever a symbol name containing multibyte characters is defined.
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+
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Each symbol has exactly one name. Each name in an assembly language program
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refers to exactly one symbol. You may use that symbol name any number of times
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in a program.
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diff -rupN binutils.orig/gas/input-scrub.c binutils-2.37/gas/input-scrub.c
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--- binutils.orig/gas/input-scrub.c 2021-11-18 16:50:38.835089547 +0000
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+++ binutils-2.37/gas/input-scrub.c 2021-11-18 16:50:42.535075612 +0000
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@@ -377,6 +377,11 @@ input_scrub_next_buffer (char **bufp)
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++p;
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}
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+ if (multibyte_handling == multibyte_warn)
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+ (void) scan_for_multibyte_characters ((const unsigned char *) p,
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+ (const unsigned char *) limit,
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+ true /* Generate warnings */);
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+
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/* We found a newline in the newly read chars. */
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partial_where = p;
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partial_size = limit - p;
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diff -rupN binutils.orig/gas/symbols.c binutils-2.37/gas/symbols.c
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--- binutils.orig/gas/symbols.c 2021-11-18 16:50:39.105088530 +0000
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+++ binutils-2.37/gas/symbols.c 2021-11-18 16:52:17.980716107 +0000
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@@ -78,6 +78,10 @@ struct symbol_flags
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before. It is cleared as soon as any direct reference to the
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symbol is present. */
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unsigned int weakrefd : 1;
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+
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+ /* Set when a warning about the symbol containing multibyte characters
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+ is generated. */
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+ unsigned int multibyte_warned : 1;
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};
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/* A pointer in the symbol may point to either a complete symbol
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@@ -194,7 +198,7 @@ static void *
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symbol_entry_find (htab_t table, const char *name)
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{
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hashval_t hash = htab_hash_string (name);
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- symbol_entry_t needle = { { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
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+ symbol_entry_t needle = { { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
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hash, name, 0, 0, 0 } };
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return htab_find_with_hash (table, &needle, hash);
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}
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@@ -305,6 +309,18 @@ symbol_init (symbolS *symbolP, const cha
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symbolP->bsym->name = name;
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symbolP->bsym->section = sec;
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+ if (multibyte_handling == multibyte_warn_syms
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+ && ! symbolP->flags.local_symbol
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+ && sec != undefined_section
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+ && ! symbolP->flags.multibyte_warned
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+ && scan_for_multibyte_characters ((const unsigned char *) name,
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+ (const unsigned char *) name + strlen (name),
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+ false /* Do not warn. */))
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+ {
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+ as_warn (_("symbol '%s' contains multibyte characters"), name);
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+ symbolP->flags.multibyte_warned = 1;
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+ }
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+
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S_SET_VALUE (symbolP, valu);
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symbol_clear_list_pointers (symbolP);
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@@ -2413,7 +2429,21 @@ S_SET_SEGMENT (symbolS *s, segT seg)
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abort ();
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}
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else
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- s->bsym->section = seg;
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+ {
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+ if (multibyte_handling == multibyte_warn_syms
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+ && ! s->flags.local_symbol
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+ && seg != undefined_section
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+ && ! s->flags.multibyte_warned
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+ && scan_for_multibyte_characters ((const unsigned char *) s->name,
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+ (const unsigned char *) s->name + strlen (s->name),
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+ false))
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+ {
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+ as_warn (_("symbol '%s' contains multibyte characters"), s->name);
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|
+ s->flags.multibyte_warned = 1;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ s->bsym->section = seg;
|
||||||
|
+ }
|
||||||
|
}
|
||||||
|
|
||||||
|
void
|
||||||
|
diff -rupN binutils.orig/gas/testsuite/gas/all/gas.exp binutils-2.37/gas/testsuite/gas/all/gas.exp
|
||||||
|
--- binutils.orig/gas/testsuite/gas/all/gas.exp 2021-11-18 16:50:39.101088545 +0000
|
||||||
|
+++ binutils-2.37/gas/testsuite/gas/all/gas.exp 2021-11-18 16:50:42.538075600 +0000
|
||||||
|
@@ -494,3 +494,5 @@ run_dump_test "nop"
|
||||||
|
run_dump_test "asciz"
|
||||||
|
run_dump_test "pr27384"
|
||||||
|
run_dump_test "pr27381"
|
||||||
|
+run_dump_test "multibyte1"
|
||||||
|
+run_dump_test "multibyte2"
|
||||||
|
diff -rupN binutils.orig/testsuite/gas/all/multibyte.s binutils-2.37/testsuite/gas/all/multibyte.s
|
||||||
|
--- binutils.orig/testsuite/gas/all/multibyte.s 1970-01-01 01:00:00.000000000 +0100
|
||||||
|
+++ binutils-2.37/testsuite/gas/all/multibyte.s 2021-11-18 16:50:42.541075589 +0000
|
||||||
|
@@ -0,0 +1,8 @@
|
||||||
|
+ .text
|
||||||
|
+ .globl heoll
|
||||||
|
+heoll:
|
||||||
|
+ .nop
|
||||||
|
+
|
||||||
|
+ .globl hello
|
||||||
|
+hello:
|
||||||
|
+ .nop
|
||||||
|
diff -rupN binutils.orig/testsuite/gas/all/multibyte1.d binutils-2.37/testsuite/gas/all/multibyte1.d
|
||||||
|
--- binutils.orig/testsuite/gas/all/multibyte1.d 1970-01-01 01:00:00.000000000 +0100
|
||||||
|
+++ binutils-2.37/testsuite/gas/all/multibyte1.d 2021-11-18 16:50:42.541075589 +0000
|
||||||
|
@@ -0,0 +1,3 @@
|
||||||
|
+#source: multibyte.s
|
||||||
|
+#as: --multibyte-handling=warn
|
||||||
|
+#warning_output: multibyte1.l
|
||||||
|
diff -rupN binutils.orig/testsuite/gas/all/multibyte1.l binutils-2.37/testsuite/gas/all/multibyte1.l
|
||||||
|
--- binutils.orig/testsuite/gas/all/multibyte1.l 1970-01-01 01:00:00.000000000 +0100
|
||||||
|
+++ binutils-2.37/testsuite/gas/all/multibyte1.l 2021-11-18 16:50:42.541075589 +0000
|
||||||
|
@@ -0,0 +1,12 @@
|
||||||
|
+[^:]*: Assembler messages:
|
||||||
|
+[^:]*: Warning: multibyte character \(0xe2\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0x80\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0xae\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0xe2\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0x80\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0xac\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0xe2\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0x80\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0xae\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: multibyte character \(0xe2\) encountered in .*multibyte.s
|
||||||
|
+[^:]*: Warning: further multibyte character warnings suppressed
|
||||||
|
diff -rupN binutils.orig/testsuite/gas/all/multibyte2.d binutils-2.37/testsuite/gas/all/multibyte2.d
|
||||||
|
--- binutils.orig/testsuite/gas/all/multibyte2.d 1970-01-01 01:00:00.000000000 +0100
|
||||||
|
+++ binutils-2.37/testsuite/gas/all/multibyte2.d 2021-11-18 16:50:42.542075585 +0000
|
||||||
|
@@ -0,0 +1,3 @@
|
||||||
|
+#source: multibyte.s
|
||||||
|
+#as: --multibyte-handling=warn-sym-only
|
||||||
|
+#warning_output: multibyte2.l
|
||||||
|
diff -rupN binutils.orig/testsuite/gas/all/multibyte2.l binutils-2.37/testsuite/gas/all/multibyte2.l
|
||||||
|
--- binutils.orig/testsuite/gas/all/multibyte2.l 1970-01-01 01:00:00.000000000 +0100
|
||||||
|
+++ binutils-2.37/testsuite/gas/all/multibyte2.l 2021-11-18 16:50:42.541075589 +0000
|
||||||
|
@@ -0,0 +1,2 @@
|
||||||
|
+[^:]*: Assembler messages:
|
||||||
|
+[^:]*:3: Warning: symbol '.*' contains multibyte characters
|
||||||
@ -39,7 +39,7 @@
|
|||||||
Summary: A GNU collection of binary utilities
|
Summary: A GNU collection of binary utilities
|
||||||
Name: binutils%{?name_cross}%{?_with_debug:-debug}
|
Name: binutils%{?name_cross}%{?_with_debug:-debug}
|
||||||
Version: 2.37
|
Version: 2.37
|
||||||
Release: 12%{?dist}
|
Release: 13%{?dist}
|
||||||
License: GPLv3+
|
License: GPLv3+
|
||||||
URL: https://sourceware.org/binutils
|
URL: https://sourceware.org/binutils
|
||||||
|
|
||||||
@ -295,6 +295,10 @@ Patch21: binutils-gas-Use-the-directory-name-in-.file-0.patch
|
|||||||
# Lifetime: Fixed in 2.38.
|
# Lifetime: Fixed in 2.38.
|
||||||
Patch22: binutils.unicode.patch
|
Patch22: binutils.unicode.patch
|
||||||
|
|
||||||
|
# Purpose: Add ability to warn about unicode characters in the assembler
|
||||||
|
# Lifetime: Fixed in 2.38.
|
||||||
|
Patch23: binutils-gas-multibyte-warnings.patch
|
||||||
|
|
||||||
#----------------------------------------------------------------------------
|
#----------------------------------------------------------------------------
|
||||||
|
|
||||||
Provides: bundled(libiberty)
|
Provides: bundled(libiberty)
|
||||||
@ -912,6 +916,9 @@ exit 0
|
|||||||
|
|
||||||
#----------------------------------------------------------------------------
|
#----------------------------------------------------------------------------
|
||||||
%changelog
|
%changelog
|
||||||
|
* Fri Nov 19 2021 Nick Clifton <nickc@redhat.com> - 2.37-13
|
||||||
|
- Add ability to warn about multibyte characters in the assembler. (#2018848)
|
||||||
|
|
||||||
* Tue Nov 09 2021 Nick Clifton <nickc@redhat.com> - 2.37-12
|
* Tue Nov 09 2021 Nick Clifton <nickc@redhat.com> - 2.37-12
|
||||||
- Add ability to show unicode characters to display tools.
|
- Add ability to show unicode characters to display tools.
|
||||||
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user