[Bug string/34466] New: string.h with _POSIX_C_SOURCE=202405L: strlcpy(), strlcat() not declared

[roman.zilka at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=34466

            Bug ID: 34466
           Summary: string.h with _POSIX_C_SOURCE=202405L: strlcpy(),
                    strlcat() not declared
           Product: glibc
           Version: 2.43
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: string
          Assignee: unassigned at sourceware dot org
          Reporter: roman.zilka at gmail dot com
  Target Milestone: ---
            Target: x86_64-pc-linux-gnu

POSIX 2024 includes strlcpy() and strlcat() in string.h, but glibc doesn't
declare them.

$ cat strlcpy-posix2024.c
#include <string.h>

int main(int argc, char *argv[]) {
        char a[10];
        strlcpy(a, argv[0], sizeof(a));
        strlcat(a, argv[0], sizeof(a));
}

$ gcc -std=c17 -pedantic -O3 -Wall -Wextra -D_POSIX_C_SOURCE=202405L
-D_FORTIFY_SOURCE=3 strlcpy-posix2024.c
strlcpy-posix2024.c: In function ‘main’:
strlcpy-posix2024.c:5:9: error: implicit declaration of function ‘strlcpy’; did
you mean ‘strncpy’? [-Wimplicit-function-declaration]
    5 |         strlcpy(a, argv[0], sizeof(a));
      |         ^~~~~~~
      |         strncpy
strlcpy-posix2024.c:6:9: error: implicit declaration of function ‘strlcat’; did
you mean ‘strncat’? [-Wimplicit-function-declaration]
    6 |         strlcat(a, argv[0], sizeof(a));
      |         ^~~~~~~
      |         strncat
strlcpy-posix2024.c:3:14: warning: unused parameter ‘argc’ [-Wunused-parameter]
    3 | int main(int argc, char *argv[]) {
      |          ~~~~^~~~

Tested on glibc 2.43, gcc 15.3.0, x86_64, Linux. I have no place to easily
check with glibc 2.44, but there's no change in include/string.h or
string/string.h in the source code of these versions.

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