1 file changed, 150 insertions, 0 deletions
diff --git a/source/cgit.mk b/source/cgit.mk
new file mode 100644
index 0000000..d012349
--- /dev/null
+++ b/source/cgit.mk
@@ -0,0 +1,150 @@
+# This Makefile runs inside the bundled Git tree (libraries/git) so that it
+# can reuse Git's build variables and platform detection. The top-level
+# Makefile invokes it as:
+#
+#     make -C libraries/git -f ../../source/cgit.mk ../../build/cgit
+#
+# so every path back into the project is prefixed with "../../": sources come
+# from ../../source and all build output goes to ../../build.
+include Makefile
+
+# Locations relative to libraries/git, where this file is run.
+CGIT_PREFIX = ../../
+CGIT_SRC    = $(CGIT_PREFIX)source/
+CGIT_BUILD  = $(CGIT_PREFIX)build/
+
+-include $(CGIT_PREFIX)cgit.conf
+
+# The CGIT_* variables are inherited from the top-level Makefile.
+
+$(CGIT_BUILD)VERSION: force-version
+	@mkdir -p $(CGIT_BUILD)
+	@cd $(CGIT_PREFIX) && '$(SHELL_PATH_SQ)' source/gen-version.sh "$(CGIT_VERSION)" build/VERSION
+-include $(CGIT_BUILD)VERSION
+.PHONY: force-version
+
+# CGIT_CFLAGS is tracked separately so that changing it does not force a
+# rebuild of Git itself.
+CGIT_CFLAGS += -DCGIT_CONFIG='"$(CGIT_CONFIG)"'
+CGIT_CFLAGS += -DCGIT_SCRIPT_NAME='"$(CGIT_SCRIPT_NAME)"'
+CGIT_CFLAGS += -DCGIT_CACHE_ROOT='"$(CACHE_ROOT)"'
+
+PKG_CONFIG ?= pkg-config
+
+ifdef NO_C99_FORMAT
+	CFLAGS += -DNO_C99_FORMAT
+endif
+
+ifdef NO_LUA
+	LUA_MESSAGE := linking without specified Lua support
+	CGIT_CFLAGS += -DNO_LUA
+else
+ifeq ($(LUA_PKGCONFIG),)
+	LUA_PKGCONFIG := $(shell for pc in luajit lua lua5.2 lua5.1; do \
+			$(PKG_CONFIG) --exists $$pc 2>/dev/null && echo $$pc && break; \
+			done)
+	LUA_MODE := autodetected
+else
+	LUA_MODE := specified
+endif
+ifneq ($(LUA_PKGCONFIG),)
+	LUA_MESSAGE := linking with $(LUA_MODE) $(LUA_PKGCONFIG)
+	LUA_LIBS := $(shell $(PKG_CONFIG) --libs $(LUA_PKGCONFIG) 2>/dev/null)
+	LUA_CFLAGS := $(shell $(PKG_CONFIG) --cflags $(LUA_PKGCONFIG) 2>/dev/null)
+	CGIT_LIBS += $(LUA_LIBS)
+	CGIT_CFLAGS += $(LUA_CFLAGS)
+else
+	LUA_MESSAGE := linking without autodetected Lua support
+	NO_LUA := YesPlease
+	CGIT_CFLAGS += -DNO_LUA
+endif
+
+endif
+
+# Add -ldl to linker flags on systems that commonly use GNU libc.
+ifneq (,$(filter $(uname_S),Linux GNU GNU/kFreeBSD))
+	CGIT_LIBS += -ldl
+endif
+
+# glibc 2.1+ offers sendfile which the most common C library on Linux
+ifeq ($(uname_S),Linux)
+	HAVE_LINUX_SENDFILE = YesPlease
+endif
+
+ifdef HAVE_LINUX_SENDFILE
+	CGIT_CFLAGS += -DHAVE_LINUX_SENDFILE
+endif
+
+CGIT_OBJ_NAMES += cgit.o
+CGIT_OBJ_NAMES += cache.o
+CGIT_OBJ_NAMES += cmd.o
+CGIT_OBJ_NAMES += configfile.o
+CGIT_OBJ_NAMES += filter.o
+CGIT_OBJ_NAMES += html.o
+CGIT_OBJ_NAMES += parsing.o
+CGIT_OBJ_NAMES += scan-tree.o
+CGIT_OBJ_NAMES += shared.o
+CGIT_OBJ_NAMES += ui-atom.o
+CGIT_OBJ_NAMES += ui-blame.o
+CGIT_OBJ_NAMES += ui-blob.o
+CGIT_OBJ_NAMES += ui-clone.o
+CGIT_OBJ_NAMES += ui-commit.o
+CGIT_OBJ_NAMES += ui-diff.o
+CGIT_OBJ_NAMES += ui-log.o
+CGIT_OBJ_NAMES += ui-patch.o
+CGIT_OBJ_NAMES += ui-plain.o
+CGIT_OBJ_NAMES += ui-refs.o
+CGIT_OBJ_NAMES += ui-repolist.o
+CGIT_OBJ_NAMES += ui-shared.o
+CGIT_OBJ_NAMES += ui-snapshot.o
+CGIT_OBJ_NAMES += ui-ssdiff.o
+CGIT_OBJ_NAMES += ui-stats.o
+CGIT_OBJ_NAMES += ui-summary.o
+CGIT_OBJ_NAMES += ui-tag.o
+CGIT_OBJ_NAMES += ui-tree.o
+
+CGIT_OBJS := $(addprefix $(CGIT_BUILD),$(CGIT_OBJ_NAMES))
+
+# Only cgit.c references CGIT_VERSION, so only its objects rebuild when the
+# version changes.
+CGIT_VERSION_OBJS := $(addprefix $(CGIT_BUILD),cgit.o cgit.sp)
+$(CGIT_VERSION_OBJS): $(CGIT_BUILD)VERSION
+$(CGIT_VERSION_OBJS): EXTRA_CPPFLAGS = \
+	-DCGIT_VERSION='"$(CGIT_VERSION)"'
+
+# Git handles dependencies using ":=" so dependencies in CGIT_OBJS are not
+# handled by that and we must handle them ourselves.
+cgit_dep_files := $(foreach f,$(CGIT_OBJS),$(dir $f).depend/$(notdir $f).d)
+cgit_dep_files_present := $(wildcard $(cgit_dep_files))
+ifneq ($(cgit_dep_files_present),)
+include $(cgit_dep_files_present)
+endif
+
+ifeq ($(wildcard $(CGIT_BUILD).depend),)
+missing_dep_dirs += $(CGIT_BUILD).depend
+endif
+
+$(CGIT_BUILD).depend:
+	@mkdir -p $@
+
+$(CGIT_BUILD)CGIT-CFLAGS: FORCE
+	@mkdir -p $(CGIT_BUILD)
+	@FLAGS='$(subst ','\'',$(CGIT_CFLAGS))'; \
+	    if test x"$$FLAGS" != x"`cat $(CGIT_BUILD)CGIT-CFLAGS 2>/dev/null`" ; then \
+		echo 1>&2 "    * new CGit build flags"; \
+		echo "$$FLAGS" >$(CGIT_BUILD)CGIT-CFLAGS; \
+            fi
+
+$(CGIT_OBJS): $(CGIT_BUILD)%.o: $(CGIT_SRC)%.c GIT-CFLAGS $(CGIT_BUILD)CGIT-CFLAGS $(missing_dep_dirs)
+	$(QUIET_CC)$(CC) -o $@ -c $(dep_args) $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $(CGIT_CFLAGS) $<
+
+$(CGIT_BUILD)cgit: $(CGIT_OBJS) GIT-LDFLAGS $(GITLIBS)
+	@echo 1>&1 "    * $(LUA_MESSAGE)"
+	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS) $(CGIT_LIBS)
+
+CGIT_SP_OBJS := $(patsubst %.o,%.sp,$(CGIT_OBJS))
+
+$(CGIT_SP_OBJS): $(CGIT_BUILD)%.sp: $(CGIT_SRC)%.c GIT-CFLAGS $(CGIT_BUILD)CGIT-CFLAGS FORCE
+	$(QUIET_SP)cgcc -no-compile $(ALL_CFLAGS) $(EXTRA_CPPFLAGS) $(CGIT_CFLAGS) $(SPARSE_FLAGS) $<
+
+cgit-sparse: $(CGIT_SP_OBJS)