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commit    cf35406f9bce70c5f52b11122bdfb245c680000b
Author:   Noah Misch <noah@leadboat.com>
Date:     Sun Jul 24 00:30:03 2016 +0000
First released in: 9.6.0, 9.1.23, 9.2.18, 9.3.14, 9.4.9, 9.5.4

    Make the AIX case of Makefile.shlib safe for parallel make.
    
    Use our typical approach, from src/backend/parser.  Back-patch to 9.1
    (all supported versions).


 src/Makefile.shlib | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/Makefile.shlib b/src/Makefile.shlib
index 86db52fe5e1..924d21f443c 100644
--- a/src/Makefile.shlib
+++ b/src/Makefile.shlib
@@ -338,7 +338,16 @@ 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)


[parent: 2aa2533f2818]