meson: Check for shadow password symbols, GitHub #1777

meson.build

@@ -1734,13 +1734,38 @@ enable_shadow = get_option('with-shadow')
 if not enable_shadow
     have_shadow = false
 else
-    have_shadow = (cc.has_header('shadow.h'))
+    if cc.has_header('shadow.h')
+        have_shadow = cc.compiles(
+                '''
+            #include <stdlib.h>
+            #include <stdio.h>
+            #include <shadow.h>
+            int main(void) {
+                struct spwd *sp;
+                getspnam("bork");
+                return 0;
+            }
+            ''',
+            )
+    else
+        have_shadow = cc.compiles(
+                '''
+            #include <stdlib.h>
+            #include <stdio.h>
+            int main(void) {
+                struct spwd *sp;
+                getspnam("bork");
+                return 0;
+            }
+            ''',
+            )
+    endif
     if have_shadow
         cdata.set('SHADOWPW', 1)
         uams_options += 'shadow'
     else
         have_shadow = false
-        warning('Shadow password support requested but required header not found')
+        warning('Shadow password support requested but required symbols not found')
     endif
 endif
 
@@ -2434,6 +2459,7 @@ if have_quota
     }
 endif
 summary_info += {
+    '  Shadow passwords': have_shadow,
     '  Spotlight': have_spotlight,
     '  TCP wrapper': have_tcpwrap,
     '  Zeroconf': have_zeroconf,