[bug #63031] -Wbuiltin-declaration-mismatch in getopt.c on musl

[Sam James]

URL:
  <https://savannah.gnu.org/bugs/?63031>

                 Summary: -Wbuiltin-declaration-mismatch in getopt.c on musl
                 Project: gperf
               Submitter: thesamesam
               Submitted: Thu 08 Sep 2022 02:03:56 AM UTC
                Category: None
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any


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Follow-up Comments:


-------------------------------------------------------
Date: Thu 08 Sep 2022 02:03:56 AM UTC By: Sam James <thesamesam>
When building gperf-3.1 with `-Werror=builtin-declaration-mismatch` and Clang
15 on musl:
```
./getopt.c: In function '_getopt_internal':
./getopt.c:611:50: error: 'strncmp' argument 3 type is 'int' where 'unsigned
int' is expected in a call to built-in function declared without prototype
[-Werror=builtin-declaration-mismatch]
  611 |         if (!strncmp (p->name, nextchar, nameend - nextchar))
      |                                          ~~~~~~~~^~~~~~~~~~
./getopt.c:198:12: note: built-in 'strncmp' declared here
  198 | extern int strncmp ();
      |            ^~~~~~~
./getopt.c:800:52: error: 'strncmp' argument 3 type is 'int' where 'unsigned
int' is expected in a call to built-in function declared without prototype
[-Werror=builtin-declaration-mismatch]
  800 |           if (!strncmp (p->name, nextchar, nameend - nextchar))
      |                                            ~~~~~~~~^~~~~~~~~~
./getopt.c:198:12: note: built-in 'strncmp' declared here
  198 | extern int strncmp ();
      |            ^~~~~~~
./getline.cc: In function 'int getstr(char**, size_t*, FILE*, char, size_t)':
./getline.cc:58:20: warning: ISO C++17 does not allow 'register' storage class
specifier [-Wregister]
   58 |       register int c = getc (stream);
      |                    ^
cc1: some warnings being treated as errors
make[1]: *** [Makefile:85: getopt.o] Error 1
make[1]: Leaving directory
'/var/tmp/portage/dev-util/gperf-3.1/work/gperf-3.1/lib'
make: *** [Makefile:33: all] Error 2
```

Originally reported downstream in Gentoo at https://bugs.gentoo.org/869134.






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File Attachments:


-------------------------------------------------------
Date: Thu 08 Sep 2022 02:03:56 AM UTC  Name: build.log  Size: 10KiB   By:
thesamesam

<http://savannah.gnu.org/bugs/download.php?file_id=53662>

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