[PATCH 2/5] Makefile: define "TEST_{PROGRAM,OBJS}" variables earlier

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Define the variables that make up TEST_OBJS earlier, and don't go back
& forth in their definition. Before we'd first append $X to
$(TEST_PROGRAMS), and then substitute $X back out of it to define
$(TEST_OBJS). Let's instead add a new $(TEST_PROGRAM_OBJS) variable,
which avoids this needless back & forth substitution.

See daa99a91729 (Makefile: make sure test helpers are rebuilt when
headers change, 2010-01-26) for how we ended up with the original
$(TEST_OBJS).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 Makefile | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index b2304aa93a3..0d6b2caa7d9 100644
--- a/Makefile
+++ b/Makefile
@@ -617,7 +617,8 @@ SCRIPT_PYTHON =
 SCRIPT_SH =
 SCRIPT_LIB =
 TEST_BUILTINS_OBJS =
-TEST_OBJS =
+TEST_PROGRAMS =
+TEST_PROGRAM_OBJS =
 TEST_PROGRAMS_NEED_X =
 THIRD_PARTY_SOURCES =
 
@@ -794,6 +795,7 @@ TEST_BUILTINS_OBJS += test-wildmatch.o
 TEST_BUILTINS_OBJS += test-windows-named-pipe.o
 TEST_BUILTINS_OBJS += test-write-cache.o
 TEST_BUILTINS_OBJS += test-xml-encode.o
+TEST_PROGRAM_OBJS += $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
 
 # Do not add more tests here unless they have extra dependencies. Add
 # them in TEST_BUILTINS_OBJS above.
@@ -801,6 +803,9 @@ TEST_PROGRAMS_NEED_X += test-fake-ssh
 TEST_PROGRAMS_NEED_X += test-tool
 
 TEST_PROGRAMS = $(patsubst %,t/helper/%$X,$(TEST_PROGRAMS_NEED_X))
+all:: $(TEST_PROGRAMS)
+TEST_PROGRAM_OBJS += $(patsubst %,t/helper/%.o,$(TEST_PROGRAMS_NEED_X))
+.PRECIOUS: $(TEST_PROGRAM_OBJS)
 
 # List built-in command $C whose implementation cmd_$C() is not in
 # builtin/$C.o but is linked in as part of some other command.
@@ -2537,10 +2542,8 @@ REFTABLE_TEST_OBJS += reftable/stack_test.o
 REFTABLE_TEST_OBJS += reftable/test_framework.o
 REFTABLE_TEST_OBJS += reftable/tree_test.o
 
-TEST_OBJS := $(patsubst %$X,%.o,$(TEST_PROGRAMS)) $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
-
 .PHONY: test-objs
-test-objs: $(TEST_OBJS)
+test-objs: $(TEST_PROGRAM_OBJS)
 
 GIT_OBJS += $(LIB_OBJS)
 GIT_OBJS += $(BUILTIN_OBJS)
@@ -2551,7 +2554,7 @@ git-objs: $(GIT_OBJS)
 
 OBJECTS += $(GIT_OBJS)
 OBJECTS += $(PROGRAM_OBJS)
-OBJECTS += $(TEST_OBJS)
+OBJECTS += $(TEST_PROGRAM_OBJS)
 OBJECTS += $(XDIFF_OBJS)
 OBJECTS += $(FUZZ_OBJS)
 OBJECTS += $(REFTABLE_OBJS) $(REFTABLE_TEST_OBJS)
@@ -3060,7 +3063,7 @@ endif
 
 test_bindir_programs := $(patsubst %,bin-wrappers/%,$(BINDIR_PROGRAMS_NEED_X) $(BINDIR_PROGRAMS_NO_X) $(TEST_PROGRAMS_NEED_X))
 
-all:: $(TEST_PROGRAMS) $(test_bindir_programs)
+all:: $(test_bindir_programs)
 
 bin-wrappers/%: wrap-for-bin.sh
 	$(call mkdir_p_parent_template)
@@ -3086,8 +3089,6 @@ perf: all
 
 .PHONY: test perf
 
-.PRECIOUS: $(TEST_OBJS)
-
 t/helper/test-tool$X: $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
 
 t/helper/test-%$X: t/helper/test-%.o GIT-LDFLAGS $(GITLIBS) $(REFTABLE_TEST_LIB)
-- 
2.37.3.1426.g360dd7cf8ca