cygwin 3.6.0 vs. libbsd 0.11.7-3: -lbsd breaks setproctitle()

Wed Feb 19 10:14:15 GMT 2025

Testcase:
$ uname -r
3.6.0-0.375.ged18acfe8c76.x86_64
$ cygcheck -f /usr/include/bsd/unistd.h
libbsd-devel-0.11.7-3
$ cat spt.c
#include <unistd.h>
int main(int argc, char **argv, char **envp)
{
   initsetproctitle(argc, argv, envp);
   setproctitle("argc = %d", argc);
   sleep(2);
   return 0;
}
$ gcc -o spt-bsdovl -isystem /usr/include/bsd -DLIBBSD_OVERLAY spt.c -l bsd
$ gcc -o spt-bsd spt.c -l bsd
$ gcc -o spt-nobsd spt.c
$ ./spt-bsdovl
spt-bsdovl: setproctitle not initialized, please either call 
setproctitle_init() or link against libbsd-ctor.
$ ./spt-bsd
spt-bsd: setproctitle not initialized, please either call 
setproctitle_init() or link against libbsd-ctor.
$ ./spt-nobsd & procps -o pid,args -p $!
[1] 2750
   PID COMMAND
  2750 spt-nobsd: argc = 1
$ objdump -p spt-bsd.exe | grep setproctitle_init || echo NOT FOUND
NOT FOUND
$ objdump -p spt-bsd.exe | grep -B2 setproctitle
         DLL Name: cygbsd-0.dll
         vma:     Ordinal  Hint  Member-Name  Bound-To
         000080e0  <none>  0034  setproctitle
$ objdump -p spt-nobsd.exe | grep -B14 setproctitle
         DLL Name: cygwin1.dll
         vma:     Ordinal  Hint  Member-Name  Bound-To
         ...
         00008128  <none>  0544  setproctitle
cygbsd-0.dll:setproctitle_init exists but is no longer linked because 
the static inline takes precedence:
/usr/include/bsd/unistd.h:
void setproctitle_init(int argc, char *argv[], char *envp[]);
/usr/include/sys/unistd.h:
static inline void setproctitle_init (int, char *[], char *[]) {}
Conflict is likely introduced by (not present in 3.5.*):
https://cygwin.com/git/?p=newlib-cygwin.git;a=commit;h=2e7f7b96
-- 
Regards,
Christian