science/mbdyn: Unbreak build by properly implementing get_nprocs() for FreeBSD.

It looks like it was only built for one CPU before and didn't fail.
Some change in the underlying libraries triggered the build to become
multi-CPU and it began failing because get_nprocs() wasn't available
for FreeBSD and also was't properly linked to the surrounding code.
Reported by:	fallout

1 files changed, 39 insertions, 0 deletions

diff --git a/science/mbdyn/files/patch-libraries_libobjs_get__nprocs.c b/science/mbdyn/files/patch-libraries_libobjs_get__nprocs.c
new file mode 100644
index 000000000000..9aaa6e62bd02
--- /dev/null
+++ b/science/mbdyn/files/patch-libraries_libobjs_get__nprocs.c
@@ -0,0 +1,39 @@
+--- libraries/libobjs/get_nprocs.c.orig	2021-04-22 19:18:04 UTC
++++ libraries/libobjs/get_nprocs.c
+@@ -39,10 +39,28 @@
+ 
+ #ifndef HAVE_GET_NPROCS
+ 
++#if defined(__FreeBSD__)
++#include <sys/types.h>
++#include <sys/sysctl.h>
++#include <stdio.h>
++#include <stdlib.h>
++#endif
++
+ /* GNU libc */
+ int
+ get_nprocs(void)
+ {
++#if defined(__FreeBSD__)
++	static int name[2] = {CTL_HW, HW_NCPU};
++	int32_t ncpu;
++	size_t size = sizeof(ncpu);
++	if (sysctl(name, sizeof(name)/sizeof(*name), &ncpu, &size, NULL, 0)) {
++		perror("unable to determine number of CPUs");
++		abort();
++	}
++	return (int)ncpu;
++
++#else
+ #warning "pippero!!!"
+ #if defined(_SC_NPROCESSORS_ONLN)
+ 	/* POSIX.1. */
+@@ -65,6 +83,7 @@ get_nprocs(void)
+ #endif
+ 	/* we assume that there is at least one :) */
+ 	return 1;
++#endif
+ }
+ 
+ #endif /* HAVE_GET_NPROCS */