Make the AIX case of Makefile.shlib safe for parallel make.

nmisch · nmisch · commit 98b7a3cf2b62 · 2016-07-23T20:30:48.000-04:00
Use our typical approach, from src/backend/parser.  Back-patch to 9.1
(all supported versions).
diff --git a/src/Makefile.shlib b/src/Makefile.shlib
@@ -357,7 +357,16 @@ endif
 else # PORTNAME == aix
 
 # AIX case
-$(shlib) $(stlib): $(OBJS) | $(SHLIB_PREREQS)
+
+# There is no correct way to write a rule that generates two files.
+# Rules with two targets don't have that meaning, they are merely
+# shorthand for two otherwise separate rules.  To be safe for parallel
+# make, we must chain the dependencies like this.  The semicolon is
+# important, otherwise make will choose some built-in rule.
+
+$(stlib): $(shlib) ;
+
+$(shlib): $(OBJS) | $(SHLIB_PREREQS)
 	rm -f $(stlib)
 	$(LINK.static) $(stlib) $^
 	$(RANLIB) $(stlib)
