Re: [External] : Re: Building GNU Make 4.4.1 on zOS 28.00

On 2025-08-05 11:18, David Boyce wrote:
> My man page says:
> 
> VERSIONS
>        The execvpe() function first appeared in glibc 2.11.
> ...
>        The execvpe() function is a GNU extension.

Curiously ...

In a fresh clone of the GNU Make git repo, searching only the materials that
are in git (nothing generated), all the calls to execvpe are
wrapped by #if MK_OS_ZOS that OP is trying to build for!

There is a comment which gives a reason why execvpe cannot be used.
If the environment argument contains a PATH, excevpe will not use that
PATH for the searching; it will use whatever PATH is in its own
environment.

It seems to be used anyway on ZOS as part of some workaround.

$ git grep -B 3 -A 3 execvpe
src/job.c-# elif MK_OS_ZOS
src/job.c-  /* In z/OS we can't set environ in ASCII mode. */
src/job.c-  environ = envp;
src/job.c:  execvpe(argv[0], argv, envp);
src/job.c-
src/job.c-# else
src/job.c-
src/job.c:  /* Run the program.  Don't use execvpe() as we want the search for argv[0]
src/job.c:     to use the new PATH, but execvpe() searches before resetting PATH.  */
src/job.c-  environ = envp;
src/job.c-  execvp (argv[0], argv);
src/job.c-
--
src/job.c-          break;
src/job.c-# elif MK_OS_ZOS
src/job.c-        /* In z/OS we can't set environ in ASCII mode. */
src/job.c:        execvpe(shell, new_argv, envp);
src/job.c-# else
src/job.c-        execvp (shell, new_argv);
src/job.c-# endif