Check for the presence of _SC_NPROCESSORS_ONLN rather than using it
unconditionally with `sysconf', fixing a compilation error:
adaint.c: In function '__gnat_number_of_cpus':
adaint.c:2398:26: error: '_SC_NPROCESSORS_ONLN' undeclared (first use in this
function)
2398 | cores = (int) sysconf (_SC_NPROCESSORS_ONLN);
| ^~~~~~~~~~~~~~~~~~~~
adaint.c:2398:26: note: each undeclared identifier is reported only once for
each function it appears in
at least with with VAX/NetBSD 1.6.2. Assume _SC_NPROCESSORS_ONLN is a
macro and use #ifdef like in other places across GCC sources.
gcc/ada/
* adaint.c (__gnat_number_of_cpus): Check for the presence of
_SC_NPROCESSORS_ONLN before using it.
---
NB we could probably replace the list of OS #ifdefs with just a check for
_SC_NPROCESSORS_ONLN, making use of it automagically with any new OS that
supports it, as from the length of the list has grown up to I gather the
`sysconf' API for this variable has become a semi-established standard now
even though not actually listed by the relevant standards.
---
gcc/ada/adaint.c | 2 ++
1 file changed, 2 insertions(+)
gcc-netbsd-libada-sc-nprocessors-onln.diff
Index: gcc/gcc/ada/adaint.c
===================================================================
--- gcc.orig/gcc/ada/adaint.c
+++ gcc/gcc/ada/adaint.c
@@ -2479,7 +2479,9 @@ __gnat_number_of_cpus (void)
#if defined (__linux__) || defined (__sun__) || defined (_AIX) \
|| defined (__APPLE__) || defined (__FreeBSD__) || defined (__OpenBSD__) \
|| defined (__DragonFly__) || defined (__NetBSD__)
+#ifdef _SC_NPROCESSORS_ONLN
cores = (int) sysconf (_SC_NPROCESSORS_ONLN);
+#endif
#elif defined (__QNX__)
cores = (int) _syspage_ptr->num_cpu;
