Firefox not loading XPCOM Component under Fedora - linux

Question

I am trying to build simple XPCOM component for Firefox 3.6.13 under LINUX operating system. I successfully compiled the component using Xulrunner SDK 1.9.2.13. I kept it under components directory. But when I start my firefox firefox console shows error
'Failed to load XPCOM component:
/home/mypc/.mozilla/firefox/cxsm79p6.default/extensions/{1280606b-2510-4fe0-97ef-9b5a22eafe80}/components/MyComponent.so
By referring to this link https://developer.mozilla.org/en/Troubleshooting_XPCOM_components_registration, I followed instructions under title 'Linux-specific hints'. It says to use special linking time option -Wl,-z,defs while linking. So I added these options but now while compiling its showing error as
make: Warning: File `Makefile' has modification time 0.25 s in the future
c++ -Os -Wall -o MyComponent.so
-include xpcom-config.h -DXPCOM_GLUE_USE_NSPR -I /mnt/hgfs/C/Users/sunil/SDKS/LINUX/xulrunner-sdk/include
-I./ -L /mnt/hgfs/C/Users/sunil/SDKS/LINUX/xulrunner-sdk/lib
-lxpcomglue_s -lxpcom -lnspr4 -fno-rtti -fno-exceptions -shared -Wl,-z,defs MyComponent.cpp MyComponentModule.cpp
/tmp/ccMGUTql.o: In function
MyComponent::QueryInterface(nsID
const&, void**)':
MyComponent.cpp:(.text+0x9b):
undefined reference to
NS_TableDrivenQI(void*, QITableEntry
const*, nsID const&, void**)'
/tmp/ccbkZLTz.o: In function
NSGetModule':
MyComponentModule.cpp:(.text+0x15):
undefined reference to
NS_NewGenericModule2(nsModuleInfo
const*, nsIModule*)' collect2: ld
returned 1 exit status make: **
[build] Error 1
My New makefile is as follows
CXX = c++
CPPFLAGS += -fno-rtti \
-fno-exceptions \
-shared \
-Wl,-z,defs
# Change this to point at your Gecko SDK directory.
GECKO_SDK_PATH =/mnt/hgfs/C/Users/sunil/SDKS/LINUX/xulrunner-sdk
# GCC only define which allows us to not have to #include mozilla-config
# in every .cpp file. If your not using GCC remove this line and add
# #include "mozilla-config.h" to each of your .cpp files.
GECKO_CONFIG_INCLUDE = -include xpcom-config.h
GECKO_DEFINES = -DXPCOM_GLUE_USE_NSPR
GECKO_INCLUDES = -I $(GECKO_SDK_PATH)/include
GECKO_LDFLAGS = -L $(GECKO_SDK_PATH)/lib -lxpcomglue_s -lxpcom \
-lnspr4
FILES = MyComponent.cpp MyComponentModule.cpp
TARGET = MyComponent.so
build:
$(CXX) -Os -Wall -o $(TARGET) $(GECKO_CONFIG_INCLUDE) $(GECKO_DEFINES) $(GECKO_INCLUDES) -I./ $(GECKO_LDFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(FILES)
chmod +x $(TARGET)
strip $(TARGET)
clean:
rm $(TARGET)
Can somebody help me get around this ?

Answer 1

I think you get this error if your libraries aren't specified correctly. One of these lines might fix it:
GECKO_LDFLAGS = -L$(GECKO_SDK_PATH)/lib -L$(GECKO_SDK_PATH)/bin -Wl,-rpath-link,$(GECKO_SDK_PATH)/bin -lxpcomglue_s -lxpcom -lnspr4
or
$(CXX) -Os -Wall -o $(TARGET) $(GECKO_CONFIG_INCLUDE) $(GECKO_DEFINES) $(GECKO_INCLUDES) -I./ $(CPPFLAGS) $(CXXFLAGS) $(FILES) $(GECKO_LDFLAGS)