# The rules that compile and link cgit itself. They run with the bundled Git
# tree as the working directory so that Git's build variables and platform
# detection can be reused, which is why every path back into the project leads
# through CGIT_ROOT. The top level Makefile invokes it roughly as
#
#     make -C vendor/git -f ../../source/cgit.mk ../../build/cgit
#
# so sources are read from ../../source and all output is written to
# ../../build.
include Makefile

# TOOLSDIR and BUILDDIR are named relative to the project root because the
# version recipe changes into the root before using them. CGIT_SRC and
# CGIT_BUILD lead to the sources and the output from vendor/git, where
# everything else here runs.
CGIT_ROOT  = ../..
SRCDIR     = source
TOOLSDIR   = tools
BUILDDIR   = build
CGIT_SRC   = $(CGIT_ROOT)/$(SRCDIR)
CGIT_BUILD = $(CGIT_ROOT)/$(BUILDDIR)

# Read again here because a sub make inherits only the variables the top level
# Makefile exports, which leaves out the build options this file reads.
-include $(CGIT_ROOT)/cgit.conf

# The CGIT_ values used below are exported by the top level Makefile.
$(CGIT_BUILD)/VERSION: force-version
	@mkdir -p $(CGIT_BUILD)/
	@cd $(CGIT_ROOT) && '$(SHELL_PATH_SQ)' $(TOOLSDIR)/gen-version.sh "$(CGIT_VERSION)" $(BUILDDIR)/VERSION
-include $(CGIT_BUILD)/VERSION
.PHONY: force-version

# The language the cgit sources are written in. Both GCC and Clang default to
# this today, so pinning it changes nothing now and stops the meaning of the
# sources drifting when a compiler moves its default on, as GCC 15 did by
# defaulting to gnu23. The GNU dialect rather than plain c17 because git's
# headers use GNU extensions, and because dlsym cannot be used through a
# conforming cast. Only the cgit objects are held to this, and Git keeps
# whatever its own build decides, which on some platforms is a different
# standard again.
CGIT_STD ?= gnu17

# CGIT_CFLAGS is tracked separately so that changing it does not force a rebuild
# of Git itself.
CGIT_CFLAGS += -std=$(CGIT_STD)
CGIT_CFLAGS += -DCGIT_CONFIG='"$(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, the way the
# release build passes -Werror=format-security, 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

# The filters reach libc's write through dlsym, which lives in a library of its
# own on the systems that use GNU libc.
ifneq (,$(filter $(uname_S),Linux GNU GNU/kFreeBSD))
	CGIT_LIBS += -ldl
endif

# The cache sends a stored page straight to stdout with sendfile where it can.
# Only Linux is assumed to offer it, so everywhere else falls back to reading
# and writing the file by hand.
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 += config.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-empty.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 builds its list of dependency files with := before this file adds the
# cgit objects, so those are missing from it and have to be picked up here.
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)