[PATCH v3 6/6] Makefile: build "$(FUZZ_OBJS)" in CI, not under "all"

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

Adding $(FUZZ_OBJS) as a dependency on "all" was intentionally done in
5e472150800 (fuzz: add basic fuzz testing target., 2018-10-12).

Rather than needlessly build these objects which aren't required for
the build every time we make "all", let's instead move them to be
built by the CI jobs.

The goal is to make sure that we don't inadvertently break these, we
can accomplish that goal by building them in CI, rather than slowing
down every build of git for everyone everywhere.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 Makefile                  | 7 ++-----
 ci/run-build-and-tests.sh | 1 +
 2 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 10f7baa74b0..cfad590a194 100644
--- a/Makefile
+++ b/Makefile
@@ -665,9 +665,6 @@ FUZZ_OBJS += fuzz-pack-idx.o
 .PHONY: fuzz-objs
 fuzz-objs: $(FUZZ_OBJS)
 
-# Always build fuzz objects even if not testing, to prevent bit-rot.
-all:: $(FUZZ_OBJS)
-
 FUZZ_PROGRAMS += $(patsubst %.o,%,$(FUZZ_OBJS))
 
 # Empty...
@@ -3322,8 +3319,8 @@ FUZZ_CXXFLAGS ?= $(CFLAGS)
 
 .PHONY: fuzz-all
 
-$(FUZZ_PROGRAMS): all
+$(FUZZ_PROGRAMS): all fuzz-objs
 	$(QUIET_LINK)$(CXX) $(FUZZ_CXXFLAGS) $(LIB_OBJS) $(BUILTIN_OBJS) \
 		$(XDIFF_OBJS) $(EXTLIBS) git.o $@.o $(LIB_FUZZING_ENGINE) -o $@
 
-fuzz-all: $(FUZZ_PROGRAMS)
+fuzz-all: $(FUZZ_PROGRAMS) $(FUZZ_OBJS)
diff --git a/ci/run-build-and-tests.sh b/ci/run-build-and-tests.sh
index a66b5e8c75a..85d260476c5 100755
--- a/ci/run-build-and-tests.sh
+++ b/ci/run-build-and-tests.sh
@@ -10,6 +10,7 @@ windows*) cmd //c mklink //j t\\.prove "$(cygpath -aw "$cache_dir/.prove")";;
 *) ln -s "$cache_dir/.prove" t/.prove;;
 esac
 
+make fuzz-objs
 make
 case "$jobname" in
 linux-gcc)
-- 
2.30.0.284.gd98b1dd5eaa7