# This Makefile runs inside the bundled Git tree (vendor/git) so that it
# can reuse Git's build variables and platform detection. The top-level
# Makefile invokes it as:
#
#     make -C vendor/git -f ../../source/cgit.mk ../../build/cgit
#
# so every path back into the project reaches through CGIT_ROOT ("../.."):
# sources come from ../../source and all build output goes to ../../build.
include Makefile

# Locations relative to vendor/git, where this file is run. SRCDIR and
# BUILDDIR name the root-relative subdirs (matching the top-level Makefile and
# used by the version recipe, which cds to the root); CGIT_SRC and CGIT_BUILD
# are their full paths from here.
CGIT_ROOT  = ../..
SRCDIR     = source
BUILDDIR   = build
CGIT_SRC   = $(CGIT_ROOT)/$(SRCDIR)
CGIT_BUILD = $(CGIT_ROOT)/$(BUILDDIR)

# Emit zero-initialised globals as plain definitions instead of common
# symbols, the default everywhere but Apple clang. ld64 otherwise derives
# a 32 KB alignment from the size of git's 64 KB packet_buffer and warns
# about reducing it on every macOS link. Use override so a command-line
# CFLAGS (as tools/release-build.sh passes) still keeps the flag.
override CFLAGS += -fno-common

-include $(CGIT_ROOT)/cgit.conf

# The CGIT_* variables are inherited from the top-level Makefile.

$(CGIT_BUILD)/VERSION: force-version
	@mkdir -p $(CGIT_BUILD)/
	@cd $(CGIT_ROOT) && '$(SHELL_PATH_SQ)' $(SRCDIR)/gen-version.sh "$(CGIT_VERSION)" $(BUILDDIR)/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)"'

# Reaches only the cgit objects, so a caller can tighten the build (CI passes
# -Werror) without holding git's own sources to the same standard.
CGIT_CFLAGS += $(CGIT_EXTRA_CFLAGS)

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 lua5.4 lua5.3 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-help.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>&2 "    * $(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)