[Bug 293660] 15.0-RELEASE FTBFS in crypto/krb5 when cross-compiling on x86_64-linux-gnu host

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293660

            Bug ID: 293660
           Summary: 15.0-RELEASE FTBFS in crypto/krb5 when cross-compiling
                    on x86_64-linux-gnu host
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: alex@alexrp.com

On an x86_64-linux-gnu host, running

    wget https://download.freebsd.org/ftp/releases/amd64/15.0-RELEASE/src.txz
-O - | bsdtar -xf -
    cd usr/src
    MAKEOBJDIRPREFIX=$PWD/build tools/build/make.py buildworld
--bootstrap-toolchain TARGET=amd64 TARGET_ARCH=amd64

fails with

   
/home/alexrp/Sources/freebsd/usr/src/crypto/krb5/src/util/support/strerror_r.c:
In function ‘k5_strerror_r’:
   
/home/alexrp/Sources/freebsd/usr/src/crypto/krb5/src/util/support/strerror_r.c:94:12:
error: returning ‘char *’ from a function with return type ‘int’ makes integer
from pointer without a cast [-Wint-conversion]
       94 |     return strerror_r(errnum, buf, buflen);
          |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

while building the bootstrap toolchain.

Presumably this happens because this code is seeing the GNU version of
strerror_r():

    char *strerror_r(int errnum, char buf[.buflen], size_t buflen);

I'm not familiar enough with this code to suggest an appropriate fix though.

In case it matters:

    ❯ uname -mrs
    Linux 6.17.0-14-generic x86_64
    ❯ gcc --version | head -n1
    gcc (Ubuntu 15.2.0-4ubuntu4) 15.2.0

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