Linker issues

[moritz-wundke]

Linker issues

[jauhien]

Not sure if understand your problem correctly, but to solve problems with undefined references to STL I use this ugly hack in our project:

LOCAL_LDLIBS := -lboost_filesystem-$(GCC_POSTFIX) -lboost_system-$(GCC_POSTFIX) -lboost_regex-$(GCC_POSTFIX) -lboost_thread-$(GCC_POSTFIX) -lgnustl_static
LOCAL_LDFLAGS += -L$(LOCAL_PATH)/boost/lib/ 
LOCAL_LDFLAGS += -L$(NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/$(GCC_VERSION)/libs/armeabi-v7a/ 

It means, I add -lgnustl_static at the end of LDLIBS and path to it to LDFLAGS. Usualy problem is caused by having linking with stl mentioned before libraries that use it in the linker call. To see actual calls ndk-build does you can run it with -n option. Hope this helps.

Thank you for the answer.

I'm building the app by using bjam, I wrote Jamroot and Jamfiles for my projects.
I added path to stl /lib and stl library file name explicitly as linker option via <linkflags> when
defining toolset in user-config.jam:

using gcc : android4.8 :
: <linkflags>-L$(ANDROID_NDK_ROOT)/sources/cxx-stl/gnu-libstdc++/4.8/libs/armeabi
<linkflags>-lgnustl_static
<linkflags>--sysroot=$(ANDROID_NDK_ROOT)/platforms/android-9arh-arm
<compileflags>--sysroot=$(ANDROID_NDK_ROOT)/platforms/android-9arh-arm
...
;

I also added sysroot to linker too. It did the trick (no unresolved extrnals). But the only one problem left. I see '-lrt' in linker command line. I can't realize where it comes from. I tried to copy the g++ command line bjam provides on link failure and remove -lrt, app builded.
How to get rid of librt.a (-lrt)? It seems boost.build includes this option. I will investigate. If you had any idea on this, I would be really apprecited to hear it.

Regards.

[inetic]

Hi, I remember looking for that flag as well some time ago. But for a different reason I think.

Try the file: BOOST_DIR/tools/build/v2/tools/gcc.jam

Line: 1071 (depends on boost version I guess, do a search for "setup-threading" in that file)

EDIT: My solution was to comment out the line "libs = rt ;", see this commit.

Thank you, that is I looked for!