Hi, I am using GNU Autotool toolchain to work in Eclipse. I have some problems with linking to static library.
First, I create a static library project "GPIOPin" and successfully compiling it with following Makefile.am: noinst_LIBRARIES = libGPIOPin.a libGPIOPin_a_SOURCES = GPIOPin.cpp GPIOPin.h AM_CXXFLAGS = @GPIOPin_CFLAGS@ AM_LDFLAGS = @GPIOPin_LIBS@ CLEANFILES = *~ Then I created a test project "Test3" which included "GPIOPin.h". I wrote the following Makefile.am for Test3: bin_PROGRAMS = Test3 Test3_SOURCES = Test3.cpp Test3_LDFLAGS = -L/home/kevinthefire/workspace/GPIOPin/src Test3_LDADD = /home/kevinthefire/workspace/GPIOPin/src/libGPIOPin.a AM_CXXFLAGS = -I/home/kevinthefire/workspace/GPIOPin/src AM_LDFLAGS = @Test3_LIBS@ @Test3_LDFLAGS@ AM_LDADD = @Test3_LDADD@ CLEANFILES = *~ It was compiled and running well. Then I tried to create another static library "Encoder" which needed to include GPIOPin library. I wrote the following Makefile.am: noinst_LIBRARIES = libEncoder.a libEncoder_a_SOURCES = Encoder.cpp Encoder.h Encoder_LDFLAGS = -L/home/kevinthefire/workspace/GPIOPin/src Encoder_LDADD = /home/kevinthefire/workspace/GPIOPin/src/libGPIOPin.a AM_CXXFLAGS = -I/home/kevinthefire/workspace/GPIOPin/src AM_LDFLAGS = @Encoder_LIBS@ @Encoder_LDFLAGS@ AM_LDADD = @Encoder_LDADD@ CLEANFILES = *~ It could be compiled well. Finally I tried to test Encoder library as before. I create "Test6" Project which only included "Encoder.h" and wrote Makefile.am similarly as Test3: bin_PROGRAMS = Test6 Test6_SOURCES = Test6.cpp Test6_LDFLAGS = -L/home/kevinthefire/workspace/Encoder/src Test6_LDADD = /home/kevinthefire/workspace/Encoder/src/libEncoder.a AM_CXXFLAGS = -I/home/kevinthefire/workspace/Encoder/src AM_LDFLAGS = @Test6_LIBS@ @Test6_LDFLAGS@ AM_LDADD = @Test6_LDADD@ CLEANFILES = *~ It gave errors: Description Resource Path Location Type make[1]: *** [all-recursive] Error 1 Test6 C/C++ Problem make[2]: *** [Test6] Error 1 Test6 C/C++ Problem undefined reference to `GpIoPin::setEdge(char*)' Encoder.cpp /Encoder/src line 87 C/C++ Problem undefined reference to `GpIoPin::setEdge(char*)' Encoder.cpp /Encoder/src line 88 C/C++ Problem make: *** [all] Error 2 Test6 C/C++ Problem more undefined references to `GpIoPin::~GpIoPin()' follow Test6 line 25 C/C++ Problem undefined reference to `GpIoPin::~GpIoPin()' Encoder.h /Encoder/src line 25 C/C++ Problem undefined reference to `GpIoPin::~GpIoPin()' Encoder.h /Encoder/src line 26 C/C++ Problem undefined reference to `GpIoPin::GpIoPin(unsigned int, bool)' Encoder.h /Encoder/src line 25 C/C++ Problem It seems that the compiler couldn't link to GPIOPIn library through Encoder library? So I modified Makefile.am of Test6 as: bin_PROGRAMS = Test6 Test6_SOURCES = Test6.cpp Test6_LDFLAGS = -L/home/kevinthefire/workspace/Encoder/src -L/home/kevinthefire/workspace/GPIOPin/src Test6_LDADD = /home/kevinthefire/workspace/Encoder/src/libEncoder.a /home/kevinthefire/workspace/GPIOPin/src/libGPIOPin.a AM_CXXFLAGS = -I/home/kevinthefire/workspace/Encoder/src -I/home/kevinthefire/workspace/GPIOPin/src AM_LDFLAGS = @Test6_LIBS@ @Test6_LDFLAGS@ AM_LDADD = @Test6_LDADD@ CLEANFILES = *~ I just added information of GPIOPin library and it compiled well! Now I am wondering why I can't write Makefile.am of Test6 as simple as Test3, but have to list all the library information(GPIOPin and Encoder). If my Encoder library includes several libraries I created, writing Makefile.am would be trouble. Thank you for any help! Kevin
