[Bug ada/115917] New: GNAT fails to bootstrap with LTO and -Werror=lto-type-mismatch due to C_Version_String and gnat_version_string on x86_64-pc-linux-gnu

[arsen at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115917

            Bug ID: 115917
           Summary: GNAT fails to bootstrap with LTO and
                    -Werror=lto-type-mismatch due to C_Version_String and
                    gnat_version_string on x86_64-pc-linux-gnu
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
          Assignee: unassigned at gcc dot gnu.org
          Reporter: arsen at gcc dot gnu.org
                CC: dkm at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu
             Build: x86_64-pc-linux-gnu

Created attachment 58657
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58657&action=edit
possible (regression untested, but build tested) fix

$summary

I've been using the attached patch as a workaround (or potentially a fix), but
I haven't regression tested it or sent it upstream yet.

../../gcc/gcc/ada/gnatvsn.adb:51:4: warning: type of
‘gnatvsn__c_version_string’ does not match original declaration
[-Wlto-type-mismatch]
   51 |    C_Version_String : char_array (0 .. Ver_Len_Max - 1);
      |    ^
../../gcc/gcc/ada/version.c:34:6: note: array types have different bounds
   34 | char gnat_version_string[] = version_string;
      |      ^
../../gcc/gcc/ada/version.c:34:6: note: ‘gnat_version_string’ was previously
declared here