# Define COMPUTE_HEADER_DEPENDENCIES if your compiler supports the -MMD option
# and you want to avoid rebuilding objects when an unrelated header file
# changes.
+#
+# Define CHECK_HEADER_DEPENDENCIES to check for problems in the hard-coded
+# dependency rules.
GIT-VERSION-FILE: FORCE
@$(SHELL_PATH) ./GIT-VERSION-GEN
-include config.mak.autogen
-include config.mak
+ifdef CHECK_HEADER_DEPENDENCIES
+USE_COMPUTED_HEADER_DEPENDENCIES =
+endif
+
+ifdef COMPUTE_HEADER_DEPENDENCIES
+USE_COMPUTED_HEADER_DEPENDENCIES = YesPlease
+endif
+
ifdef SANE_TOOL_PATH
SANE_TOOL_PATH_SQ = $(subst ','\'',$(SANE_TOOL_PATH))
BROKEN_PATH_FIX = 's|^\# @@BROKEN_PATH_FIX@@$$|git_broken_path_fix $(SANE_TOOL_PATH_SQ)|'
xdiff/xmerge.o xdiff/xpatience.o
OBJECTS := $(GIT_OBJS) $(XDIFF_OBJS)
-ASM_SRC := $(wildcard $(OBJECTS:o=S))
-ASM_OBJ := $(ASM_SRC:S=o)
-C_OBJ := $(filter-out $(ASM_OBJ),$(OBJECTS))
+dep_files := $(foreach f,$(OBJECTS),$(dir $f)deps/$(notdir $f).d)
ifdef COMPUTE_HEADER_DEPENDENCIES
dep_dirs := $(addsuffix deps,$(sort $(dir $(OBJECTS))))
mkdir -p $@
missing_dep_dirs := $(filter-out $(wildcard $(dep_dirs)),$(dep_dirs))
-else
+dep_file = $(dir $@)deps/$(notdir $@).d
+dep_args = -MF $(dep_file) -MMD -MP
+ifdef CHECK_HEADER_DEPENDENCIES
+$(error cannot compute header dependencies outside a normal build. \
+Please unset CHECK_HEADER_DEPENDENCIES and try again)
+endif
+endif
+
+ifndef COMPUTE_HEADER_DEPENDENCIES
+ifndef CHECK_HEADER_DEPENDENCIES
dep_dirs =
missing_dep_dirs =
+dep_args =
+endif
+endif
+
+ifdef CHECK_HEADER_DEPENDENCIES
+ifndef PRINT_HEADER_DEPENDENCIES
+missing_deps = $(filter-out $(notdir $^), \
+ $(notdir $(shell $(MAKE) -s $@ \
+ CHECK_HEADER_DEPENDENCIES=YesPlease \
+ USE_COMPUTED_HEADER_DEPENDENCIES=YesPlease \
+ PRINT_HEADER_DEPENDENCIES=YesPlease)))
+endif
endif
+ASM_SRC := $(wildcard $(OBJECTS:o=S))
+ASM_OBJ := $(ASM_SRC:S=o)
+C_OBJ := $(filter-out $(ASM_OBJ),$(OBJECTS))
+
.SUFFIXES:
+ifdef PRINT_HEADER_DEPENDENCIES
+$(C_OBJ): %.o: %.c FORCE
+ echo $^
+$(ASM_OBJ): %.o: %.S FORCE
+ echo $^
+
+ifndef CHECK_HEADER_DEPENDENCIES
+$(error cannot print header dependencies during a normal build. \
+Please set CHECK_HEADER_DEPENDENCIES and try again)
+endif
+endif
+
+ifndef PRINT_HEADER_DEPENDENCIES
+ifdef CHECK_HEADER_DEPENDENCIES
+$(C_OBJ): %.o: %.c $(dep_files) FORCE
+ @set -e; echo CHECK $@; \
+ missing_deps="$(missing_deps)"; \
+ if test "$$missing_deps"; \
+ then \
+ echo missing dependencies: $$missing_deps; \
+ false; \
+ fi
+$(ASM_OBJ): %.o: %.S $(dep_files) FORCE
+ @set -e; echo CHECK $@; \
+ missing_deps="$(missing_deps)"; \
+ if test "$$missing_deps"; \
+ then \
+ echo missing dependencies: $$missing_deps; \
+ false; \
+ fi
+endif
+endif
+
+ifndef CHECK_HEADER_DEPENDENCIES
$(C_OBJ): %.o: %.c GIT-CFLAGS $(missing_dep_dirs)
$(QUIET_CC)$(CC) -o $*.o -c $(dep_args) $(ALL_CFLAGS) $<
-%.s: %.c GIT-CFLAGS FORCE
- $(QUIET_CC)$(CC) -S $(ALL_CFLAGS) $<
$(ASM_OBJ): %.o: %.S GIT-CFLAGS $(missing_dep_dirs)
$(QUIET_CC)$(CC) -o $*.o -c $(dep_args) $(ALL_CFLAGS) $<
+endif
-ifdef COMPUTE_HEADER_DEPENDENCIES
+%.s: %.c GIT-CFLAGS FORCE
+ $(QUIET_CC)$(CC) -S $(ALL_CFLAGS) $<
+
+ifdef USE_COMPUTED_HEADER_DEPENDENCIES
# Take advantage of gcc's on-the-fly dependency generation
# See <http://gcc.gnu.org/gcc-3.0/features.html>.
-dep_files := $(wildcard $(foreach f,$(OBJECTS),$(dir f)deps/$(notdir $f).d))
-ifneq ($(dep_files),)
-include $(dep_files)
+dep_files_present := $(wildcard $(dep_files))
+ifneq ($(dep_files_present),)
+include $(dep_files_present)
endif
-
-dep_file = $(dir $@)deps/$(notdir $@).d
-dep_args = -MF $(dep_file) -MMD -MP
else
-dep_args =
-
# Dependencies on header files, for platforms that do not support
# the gcc -MMD option.
#