[SV 40657] Don't create pattern rules for suffix rules with deps.

* NEWS: Update with a backward-compatibility warning.
* src/rule.c (convert_to_pattern): If a suffix rule has dependencies,
do not create a pattern rule for it.  According to the manual suffix
rules with prerequisites are treated as normal targets.
* tests/scrips/features/suffixrules: Create some regression tests for
.SUFFIXES and suffix rules.

NEWS

@@ -43,6 +43,11 @@ http://sv.gnu.org/bugs/index.php?group=make&report_id=111&fix_release_id=108&set
   N-processor systems without fear of overload.
   Patch provided by Sven C. Dack <sven.c.dack@sky.com>
 
+* WARNING: Backward-incompatibility!
+  Contrary to the documentation, suffix rules with prerequisites were being
+  treated BOTH as simple targets AND as pattern rules.  Behavior now matches
+  the documentation, and pattern rules are no longer created in this case.
+
 * Makefiles can now specify the '-j' option in their MAKEFLAGS variable and
   this will cause make to enable that parallelism mode.
 

src/rule.c

@@ -252,7 +252,10 @@ convert_to_pattern (void)
 
           memcpy (rulename + slen, dep_name (d2), s2len + 1);
           f = lookup_file (rulename);
-          if (f == 0 || f->cmds == 0)
+
+          /* No target, or no commands, or it has deps: it can't be a
+             suffix rule.  */
+          if (f == 0 || f->cmds == 0 || f->deps != 0)
             continue;
 
           if (s2len == 2 && rulename[slen] == '.' && rulename[slen + 1] == 'a')

tests/scripts/features/suffixrules

@@ -0,0 +1,78 @@
+#                                                                    -*-perl-*-
+
+$description = "Test suffix rules.";
+
+$details = "";
+
+# TEST #0: Clear all suffixes
+
+touch('foo.c');
+
+run_make_test(q!
+.SUFFIXES:
+all: foo.o ; @echo $@ $<
+!,
+              '', "#MAKE#: *** No rule to make target 'foo.o', needed by 'all'.  Stop.\n", 512);
+
+unlink('foo.c');
+
+# Test #1: Add a simple suffix rule
+
+touch('foo.baz');
+
+run_make_test(q!
+.SUFFIXES: .biz .baz
+
+.baz.biz: ; @echo make $@
+!,
+              'foo.biz', "make foo.biz\n");
+
+unlink('foo.baz');
+
+# Test #2: Make sure the defaults still work
+
+touch('foo.c');
+
+run_make_test(undef, 'foo.o COMPILE.c=@echo OUTPUT_OPTION=', "foo.c\n");
+
+unlink('foo.c');
+
+# Test #3: Replacing all suffixes
+
+touch('foo.baz');
+
+run_make_test(q!
+.SUFFIXES:
+.SUFFIXES: .biz .baz
+
+.baz.biz: ; @echo make $@
+!,
+              'foo.biz', "make foo.biz\n");
+
+unlink('foo.baz');
+
+# Test #4: Suffix rules with deps are not suffix rules
+
+touch('foo.bar');
+
+run_make_test(q!
+.SUFFIXES:
+.SUFFIXES: .biz .baz
+
+.baz.biz: foo.bar ; @echo make $@ from $<
+!,
+              '.baz.biz', "make .baz.biz from foo.bar\n");
+
+unlink('foo.bar');
+
+# Test #5: Should not create pattern rules for it either
+
+touch('foo.baz');
+
+run_make_test(undef,
+              'foo.biz', "#MAKE#: *** No rule to make target 'foo.biz'.  Stop.\n", 512);
+
+unlink('foo.baz');
+
+# Complete
+1;