[PATCH] ntdll: Only use sysinfo function when present

[Gerald Pfeifer]

On some systems <sys/sysinfo.h> may be present while the sysinfo
function may not, or at least not as part of standard libraries,
so check whether the function is actually available before using
it.

This fixes builds on FreeBSD with the devel/libsysinfo present.

Signed-off-by: Gerald Pfeifer <gerald at pfeifer.com>
---
 configure.ac              | 1 +
 dlls/ntdll/unix/virtual.c | 3 ++-
 include/config.h.in       | 3 +++
 3 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 69e27147088..065b3f231bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2205,6 +2205,7 @@ AC_CHECK_FUNCS(\
 	setprogname \
 	sigprocmask \
 	symlink \
+	sysinfo \
 	tcdrain \
 	thr_kill2
 )
diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index f055be94238..c47055fb657 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -2692,7 +2692,8 @@ ULONG_PTR get_system_affinity_mask(void)
  */
 void virtual_get_system_info( SYSTEM_BASIC_INFORMATION *info, BOOL wow64 )
 {
-#if defined(HAVE_STRUCT_SYSINFO_TOTALRAM) && defined(HAVE_STRUCT_SYSINFO_MEM_UNIT)
+#if defined(HAVE_SYSINFO) \
+    && defined(HAVE_STRUCT_SYSINFO_TOTALRAM) && defined(HAVE_STRUCT_SYSINFO_MEM_UNIT)
     struct sysinfo sinfo;
 
     if (!sysinfo(&sinfo))
diff --git a/include/config.h.in b/include/config.h.in
index ad770281471..24f7b64ffd3 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -744,6 +744,9 @@
 /* Define to 1 if you have the <syscall.h> header file. */
 #undef HAVE_SYSCALL_H
 
+/* Define to 1 if you have the `sysinfo' function. */
+#undef HAVE_SYSINFO
+
 /* Define to 1 if you have the
    <SystemConfiguration/SCDynamicStoreCopyDHCPInfo.h> header file. */
 #undef HAVE_SYSTEMCONFIGURATION_SCDYNAMICSTORECOPYDHCPINFO_H
-- 
2.31.1