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Makefile
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Makefile
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SYSROOT := $(shell em-config CACHE)/sysroot
# Add custom sysroot to library & macro search paths.
export LDFLAGS += -L$(SYSROOT)/lib
# Common linking flags for all targets.
export LDFLAGS += -s DYNAMIC_EXECUTION=0 -s AUTO_JS_LIBRARIES=0 -s AUTO_NATIVE_LIBRARIES=0
# Temporary workaround for https://github.com/emscripten-core/emscripten/issues/16836.
export LDFLAGS += -Wl,-u,ntohs
# Common compilation & linking flags for all langs and targets.
COMMON_FLAGS = -Os -flto
export CFLAGS += $(COMMON_FLAGS)
export CXXFLAGS += $(COMMON_FLAGS)
export LDFLAGS += $(COMMON_FLAGS)
## Main API module
build/libapi.mjs: src/api.o $(SYSROOT)/lib/libltdl.la $(SYSROOT)/lib/libgphoto2.la
libtool --verbose --mode=link $(LD) $(LDFLAGS) -o $@ $+ \
-fexceptions --bind -s ASYNCIFY -s ALLOW_MEMORY_GROWTH -s ENVIRONMENT=web,worker \
-dlpreopen $(SYSROOT)/lib/libgphoto2/2.5.28.1/ptp2.la \
-dlpreopen $(SYSROOT)/lib/libgphoto2_port/0.12.0/usb1.la
src/api.o: deps/libgphoto2/configure.ac
src/api.o: CPPFLAGS += -Ideps/libgphoto2 -Ideps/libgphoto2/libgphoto2_port
src/api.o: CXXFLAGS += -std=c++17 -fexceptions -pthread
## Generic rules for deps
$(SYSROOT):
mkdir -p $(@D)
deps/%/configure.ac:
git submodule update --init $(@D)
deps/%/configure: deps/%/configure.ac | $(SYSROOT)/lib/libltdl.la
cd $(@D) && autoreconf -fiv
deps/%/Makefile: deps/%/configure
cd $(@D) && ./configure --prefix=$(SYSROOT) --disable-shared $(CONFIGURE_ARGS)
## libtool
deps/libtool/configure:
mkdir -p deps/libtool
curl -L https://ftpmirror.gnu.org/libtool/libtool-2.4.6.tar.gz | tar zx --strip 1 -C deps/libtool
$(SYSROOT)/lib/libltdl.la: deps/libtool/Makefile | $(SYSROOT)
$(MAKE) -C deps/libtool install
## libusb
deps/libusb/Makefile: CONFIGURE_ARGS = --host=wasm32
$(SYSROOT)/lib/libusb-1.0.la: deps/libusb/Makefile
$(MAKE) -C deps/libusb install
## libgphoto2
deps/libgphoto2/Makefile: | $(SYSROOT)/lib/libusb-1.0.la
deps/libgphoto2/Makefile: CONFIGURE_ARGS = --host=wasm32 \
--without-libxml-2.0 --disable-nls --disable-ptpip --disable-disk \
--with-camlibs=ptp2
$(SYSROOT)/lib/libgphoto2.la: deps/libgphoto2/Makefile $(SYSROOT)/lib/libusb-1.0.la $(SYSROOT)/lib/libltdl.la
$(MAKE) -C deps/libgphoto2 install