internal/process.h: add a no-warning simple wrapper for fork(2)

As fork(2) is deprecated, its calls must be guarded by
`COMPILER_WARNING_IGNORED(-Wdeprecated-declarations)`.
All usages of fork(2) in process have been alread guarded.  A new call
to fork(2) was added in ruby.c with f22c4ff359498ab342e4b6d6feb21af6004ee270.
This caused a build failure on Solaris 11.

It may hide a bug to guard big code unnecessarily, so this change
introduces a simple wrapper "rb_fork" whose definition is guarded, and
replaces all calls to fork(2) with the wrapper function.

1 files changed, 2 insertions, 1 deletions

diff --git a/ruby.c b/ruby.c
index 405891f873..f2577f51f1 100644
--- a/ruby.c
+++ b/ruby.c
@@ -56,6 +56,7 @@
 #include "internal/missing.h"
 #include "internal/object.h"
 #include "internal/parse.h"
+#include "internal/process.h"
 #include "internal/variable.h"
 #include "mjit.h"
 #include "ruby/encoding.h"
@@ -1635,7 +1636,7 @@ process_options(int argc, char **argv, ruby_cmdline_options_t *opt)
 #ifdef HAVE_WORKING_FORK
                 int fds[2];
                 if (rb_pipe(fds) == 0) {
-                    rb_pid_t pid = fork();
+                    rb_pid_t pid = rb_fork();
                     if (pid > 0) {
                         /* exec PAGER with reading from child */
                         dup2(fds[0], 0);