Fix missing dependencies in ecpg's test Makefiles.

Ensure that ecpg preprocessor output files are rebuilt when re-testing
after a change in the ecpg preprocessor itself, or a change in any of
several include files that get copied verbatim into the output files.
The lack of these dependencies was what created problems for Kevin Grittner
after the recent pgindent run.  There's no way for --enable-depend to
discover these dependencies automatically, so we've gotta put them into
the Makefiles by hand.

While at it, reduce the amount of duplication in the ecpg invocations.

src/interfaces/ecpg/test/Makefile.regress

+# This file is included into the Makefiles of subdirectories of ecpg/test/,
+# so the file references have one more level of .. than you might expect.
+
 override CPPFLAGS := -I../../include -I$(top_srcdir)/src/interfaces/ecpg/include \
 	-I$(libpq_srcdir) $(CPPFLAGS)
 override CFLAGS += $(PTHREAD_CFLAGS)
@@ -5,13 +8,25 @@ override CFLAGS += $(PTHREAD_CFLAGS)
 override LDFLAGS := -L../../ecpglib -L../../pgtypeslib $(filter-out -l%, $(libpq)) $(LDFLAGS)
 override LIBS := -lecpg -lpgtypes $(filter -l%, $(libpq)) $(LIBS) $(PTHREAD_LIBS)
 
-ECPG = ../../preproc/ecpg --regression -I$(srcdir)/../../include
+# Standard way to invoke the ecpg preprocessor
+ECPG = ../../preproc/ecpg --regression -I$(srcdir)/../../include -I$(srcdir)
+
+# Files that most or all ecpg preprocessor test outputs depend on
+ECPG_TEST_DEPENDENCIES = ../../preproc/ecpg \
+	$(srcdir)/../regression.h \
+	$(srcdir)/../../include/sqlca.h \
+	$(srcdir)/../../include/sqlda.h \
+	$(srcdir)/../../include/sqltypes.h \
+	$(srcdir)/../../include/sql3types.h
 
 %: %.o
 	$(CC) $(CFLAGS) $< $(LDFLAGS) $(LDFLAGS_EX) $(LIBS) -o $@
 
-%.c: %.pgc ../regression.h
-	$(ECPG) -o $@ -I$(srcdir) $<
+# Caution: this build rule is overridden in some child Makefiles
+# where it's necessary to use nondefault switches to ecpg;
+# make sure those rules match except for the extra switches.
+%.c: %.pgc $(ECPG_TEST_DEPENDENCIES)
+	$(ECPG) -o $@ $<
 
 clean:
 	rm -f $(TESTS) $(TESTS:%=%.o) $(TESTS:%=%.c)

src/interfaces/ecpg/test/compat_informix/Makefile

@@ -3,9 +3,8 @@ top_builddir = ../../../../..
 include $(top_builddir)/src/Makefile.global
 include $(top_srcdir)/$(subdir)/../Makefile.regress
 
-# special informix compatibility switches
+# Use special informix compatibility switch for all tests in this directory
 ECPG += -C INFORMIX
-ECPG_NOIND  = $(ECPG) -r no_indicator
 
 override LDFLAGS := -L../../compatlib $(LDFLAGS)
 override LIBS := -lecpg_compat $(LIBS)
@@ -22,26 +21,5 @@ TESTS = test_informix test_informix.c \
 
 all: $(TESTS)
 
-test_informix.c: test_informix.pgc ../regression.h
-	$(ECPG) -o $@ -I$(srcdir) $<
-
-test_informix2.c: test_informix2.pgc ../regression.h
-	$(ECPG) -o $@ -I$(srcdir) $<
-
-sqlda.c: sqlda.pgc ../regression.h
-	$(ECPG) -o $@ -I$(srcdir) $<
-
-dec_test.c: dec_test.pgc ../regression.h
-	$(ECPG) -o $@ -I$(srcdir) $<
-
-rfmtdate.c: rfmtdate.pgc ../regression.h
-	$(ECPG) -o $@ -I$(srcdir) $<
-
-rfmtlong.c: rfmtlong.pgc ../regression.h
-	$(ECPG) -o $@ -I$(srcdir) $<
-
-rnull.c: rnull.pgc ../regression.h
-	$(ECPG_NOIND) -o $@ -I$(srcdir) $<
-
-charfuncs.c: charfuncs.pgc ../regression.h
-	$(ECPG) -o $@ -I$(srcdir) $<
+rnull.c: rnull.pgc $(ECPG_TEST_DEPENDENCIES)
+	$(ECPG) -r no_indicator -o $@ $<

src/interfaces/ecpg/test/preproc/Makefile

@@ -19,14 +19,14 @@ TESTS = array_of_struct array_of_struct.c \
 
 all: $(TESTS)
 
-array_of_struct.c:	array_of_struct.pgc ../regression.h
-	$(ECPG) -c -o $@ -I$(srcdir) $<
+array_of_struct.c: array_of_struct.pgc $(ECPG_TEST_DEPENDENCIES)
+	$(ECPG) -c -o $@ $<
 
-pointer_to_struct.c:	pointer_to_struct.pgc ../regression.h
-	$(ECPG) -c -o $@ -I$(srcdir) $<
+pointer_to_struct.c: pointer_to_struct.pgc $(ECPG_TEST_DEPENDENCIES)
+	$(ECPG) -c -o $@ $<
 
-autoprep.c:     autoprep.pgc ../regression.h
-	$(ECPG) -r prepare -o $@ -I$(srcdir) $<
+autoprep.c: autoprep.pgc $(ECPG_TEST_DEPENDENCIES)
+	$(ECPG) -r prepare -o $@ $<
 
-strings.c:     strings.pgc strings.h ../regression.h
-	$(ECPG) -i -o $@ -I$(srcdir) $<
+strings.c: strings.pgc strings.h $(ECPG_TEST_DEPENDENCIES)
+	$(ECPG) -i -o $@ $<

src/interfaces/ecpg/test/sql/Makefile

@@ -26,5 +26,5 @@ TESTS = array array.c \
 
 all: $(TESTS)
 
-oldexec.c:	oldexec.pgc ../regression.h
-	$(ECPG) -r questionmarks -o $@ -I$(srcdir) $<
+oldexec.c: oldexec.pgc $(ECPG_TEST_DEPENDENCIES)
+	$(ECPG) -r questionmarks -o $@ $<