New gtest tap file list mechanism

Fixes epics-modules#2:
- does not use makefile snippets
  (which were adding test execution to the build)
- tap file lists are created when running the tests
- 'tapfiles' target directly depends on test run
  in case tests have not been run yet

gtestSup/Makefile

@@ -12,7 +12,7 @@ LIBRARY_HOST += epics_gtest_main
 epics_gtest_main_SRCS += gtest_main.cc
 epics_gtest_main_LIBS += gmock gtest
 
-PERL_SCRIPTS += makeFromList.pl
+PERL_SCRIPTS += testSuiteList.pl
 
 CFG += RULES_GTEST
 CFG += compat.RULES_BUILD

gtestSup/RULES_GTEST

@@ -28,26 +28,33 @@ endif
 #---------------------------------------------------------------
 # Automated testing using Google Test
 
-GTESTS_MAKE = $(addsuffix .make,$(GTESTS))
 GTESTS_RUN = $(addsuffix .run,$(GTESTS))
 .PHONY: $(GTESTS_RUN)
 
 runtests: $(GTESTS_RUN)
 
-$(GTESTLISTS): %.list: %$(EXE)
-	@$(RM) $@
-	"./$<" --gtest_list_tests > $@
-
-$(GTESTS_MAKE): %.make: %.list
-	@$(RM) $@
-	@$(PERL) $(GTEST_BIN)/makeFromList.pl $*
+define gtest_run_template
+$$($(1)_TAPFILES) $(1)-results.xml: $(1).run
+	@:
+$(1).run: export GTEST_TAP_FILENAME_PREFIX=$(1)-
+$(1).run: $(1)$$(EXE)
+	@$$(ECHO) "Running test $(1)..."
+	@"./$$<" --gtest_list_tests | $$(PERL) $$(GTEST_BIN)/testSuiteList.pl > $(1).list
+	@"./$$<" --gtest_output_tap --gtest_color=yes --gtest_output=xml:$(1)-results.xml
+	@$$(ECHO) "test run" > $(1).run
+$(1)_TAPFILES = $(addprefix $(1)-,$(addsuffix .tap,$(file < $(gtest).list)))
+CLEANS += $(1).run $(1).list
+endef
 
-include $(GTESTS_MAKE)
+$(foreach gtest, $(GTESTS), $(eval $(call gtest_run_template,$(gtest))))
 
 # Can't do "undefine TAPFILES" so only define TAPFILES here if non-empty
 # (avoid old test-results rule breaking for TAPFILES = <space>)
 ifneq ($(strip $(foreach gtest, $(GTESTS), $($(gtest)_TAPFILES))),)
 TAPFILES += $(foreach gtest, $(GTESTS), $($(gtest)_TAPFILES))
+else
+# If gtest TAPFILES don't exist (tests didn't run yet), run the tests 
+tapfiles: $(GTESTS_RUN)
 endif
 
 else

gtestSup/testSuiteList.pl

@@ -0,0 +1,26 @@
+#!/usr/bin/env perl
+#*************************************************************************\
+#* Copyright (c) 2025 ITER Organization.
+#* This module is distributed subject to a Software License Agreement found
+#* in file LICENSE that is included with this distribution.
+#*************************************************************************/
+#
+#  Author: Ralph Lange <ralph.lange@gmx.de>
+#
+#	testSuiteList.pl
+#
+#	called from RULES_GTEST
+#
+#	Usage: <test-exe-name> --gtest_list_tests | perl testSuiteList.pl
+#              returns the names of reported test suites (lines ending in dot)
+#
+# Put in a minimal script as the appearance of '$' characters
+# inside a 'perl -e' expression cannot be written inside a Makefile
+# in a way that is portable between Windows (bash, command.com) and Linux
+
+while (my $line = <STDIN>)  {
+    if ($line =~ m/^[^[:space:]]*.$/) {
+        $line =~ s/.$//;
+        print $line;
+    }
+}