[binutils-gdb/binutils-2_46-branch] binutils: fix C23 -Wdiscarded-qualifiers errors

[H.J. Lu]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=922d530f0aa6973b92489e4c84a449bf09421b1f

commit 922d530f0aa6973b92489e4c84a449bf09421b1f
Author: Simon Marchi <simon.marchi@polymtl.ca>
Date:   Fri Feb 13 14:17:40 2026 -0500

    binutils: fix C23 -Wdiscarded-qualifiers errors
    
    When compiling with gcc 15, I get these:
    
          CC       prdbg.o
        /home/simark/src/binutils-gdb/binutils/prdbg.c: In function ‘tg_start_function’:
        /home/simark/src/binutils-gdb/binutils/prdbg.c:2658:11: error: assignment discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
         2658 |       sep = strchr (name, '(');
              |           ^
        cc1: all warnings being treated as errors
        make[2]: *** [Makefile:1220: prdbg.o] Error 1
          CC       addr2line.o
        /home/simark/src/binutils-gdb/binutils/addr2line.c: In function ‘translate_addresses’:
        /home/simark/src/binutils-gdb/binutils/addr2line.c:390:21: error: assignment discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
          390 |                   h = strrchr (filename, '/');
              |                     ^
        cc1: all warnings being treated as errors
        make[2]: *** [Makefile:1220: addr2line.o] Error 1
          CC       nm.o
        /home/simark/src/binutils-gdb/binutils/nm.c: In function ‘print_symname’:
        /home/simark/src/binutils-gdb/binutils/nm.c:689:21: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
          689 |       char *atver = strchr (name, '@');
              |                     ^~~~~~
        cc1: all warnings being treated as errors
    
    I think they are related to the fact that strchr having changed to
    return const when passed a const.
    
    This partially fixes PR binutils/34125.
    
    Change-Id: Idb829916378f0a18e717d1e80414aaa5eba4f7f0
    (cherry picked from commit 9cb12adfb54bc3dabf4ee00296064245eb7660ef)

Diff:
---
 binutils/addr2line.c | 2 +-
 binutils/nm.c        | 2 +-
 binutils/prdbg.c     | 8 +++++---
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/binutils/addr2line.c b/binutils/addr2line.c
index 141a7099de4..f8c110f532f 100644
--- a/binutils/addr2line.c
+++ b/binutils/addr2line.c
@@ -385,7 +385,7 @@ translate_addresses (bfd *abfd, asection *section)
 
               if (base_names && filename != NULL)
                 {
-                  char *h;
+                  const char *h;
 
                   h = strrchr (filename, '/');
                   if (h != NULL)
diff --git a/binutils/nm.c b/binutils/nm.c
index 3aef8ebe098..c5f7e68e9df 100644
--- a/binutils/nm.c
+++ b/binutils/nm.c
@@ -686,7 +686,7 @@ print_symname (const char *form, struct extended_symbol_info *info,
   if (!with_symbol_versions
       && bfd_get_flavour (abfd) == bfd_target_elf_flavour)
     {
-      char *atver = strchr (name, '@');
+      const char *atver = strchr (name, '@');
 
       if (atver)
 	{
diff --git a/binutils/prdbg.c b/binutils/prdbg.c
index 287083df1b9..ff24eac54fb 100644
--- a/binutils/prdbg.c
+++ b/binutils/prdbg.c
@@ -2642,22 +2642,24 @@ tg_start_function (void *p, const char *name, bool global)
   if (dname != NULL)
     {
       char *sep;
+      char *mutable_name;
       sep = strstr (dname, "::");
       if (sep)
 	{
 	  info->stack->method = dname;
 	  dname = NULL;
 	  *sep = 0;
-	  name = sep + 2;
+	  mutable_name = sep + 2;
 	}
       else
 	{
 	  info->stack->method = xstrdup ("");
-	  name = dname;
+	  mutable_name = dname;
 	}
-      sep = strchr (name, '(');
+      sep = strchr (mutable_name, '(');
       if (sep)
 	*sep = 0;
+      name = mutable_name;
       /* Obscure functions as type_info function.  */
     }