I am in the middle of integrating UA into my Phonegap/iOS application using the UA Phonegap plugin https://github.com/urbanairship/phonegap-ua-push.
Unfortunately, I can not get it to work. Even the sample project fails to build. The problem is a duplicate symbol during linking. Please note: i did not include any additional headers, libs, etc. I am just trying to build the iOS sample project.
The clashing symbol seems to be rooted in the ASI* (ASIHttpRequest, ASIAuthenticationDialog, etc) library, which has been integrated into UA. Surprisingly, the clashing happens between both UA libs (libUAirship-1.3.2.a and libUAirshipPush-1.3.2.a).
Linker output: ld: duplicate symbol _OBJC_METACLASS_$_UA_ASIAutorotatingViewController in /Users/b/Downloads/urbanairship-phonegap-ua-push-9b7a89b/ios-sample/Airship/libUAirshipPush-1.3.2.a(UA_ASIAuthenticationDialog.o) and /Users/b/Downloads/urbanairship-phonegap-ua-push-9b7a89b/ios-sample/Airship/libUAirship-1.3.2.a(UA_ASIAuthenticationDialog.o) for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)
How can this happen?
This issue appeared for me when I add the flag "-ObjC" in my target settings at "Other Linker Flags".
Check it, i need the flag for an another library but if it's not your case...
Related
I inherited a C++ code with a dependency to OpenMPI that I want to delegate to Conan and CMake, and the automated build has a strange (to me at least) behavior related to sysctl that I want to understand.
How I tried to do it
I declared the required dependencies in my root CMakeLists.txt:
Note: I added the full list of requirements because I also suspect that some of them may be in conflict? That happened before with boost, that forced me to set explicitly zlib (if i remember correctly).
# stuff ...
conan_cmake_configure(
REQUIRES
zlib/1.2.12
mp-units/0.7.0
boost/1.79.0
openmpi/4.1.0
gsl/2.7
cspice/0067
GENERATORS
cmake
# that is required for cspice
CMakeDeps
CMakeToolchain
)
# more stuff ...
and then in the application CmakeLists.txt I find, include and link the executable to the required libraries:
add_executable(spock main.cpp)
find_package(cspice REQUIRED)
find_package(openmpi REQUIRED)
target_include_directories(
spock PRIVATE $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include>
$<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include>
openmpi_INCLUDE_DIRS
cspice_INCLUDE_DIRS
)
target_link_libraries(spock
CONAN_PKG::boost
CONAN_PKG::mp-units
openmpi::openmpi
cspice::cspice
)
# We need C++ 20 activated with the concepts library
target_compile_features(spock PUBLIC cxx_std_20)
Problem: undefined reference to sysctl ... on my local system only.
Building on my local machine with CMake 3.23.2 results in the following error message:
Consolidate compiler generated dependencies of target spock
[ 25%] Building CXX object src/CMakeFiles/spock.dir/main.cpp.o
^[[A^[[A[ 50%] Linking CXX executable ../bin/spock
/usr/bin/ld: /home/becheler/.conan/data/openmpi/4.1.0/_/_/package/8f7048d1bf6fc2a7985eb087c34e69a5e64f6c86/lib/libopen-pal.a(evutil_rand.o): in function `arc4_stir.isra.0':
evutil_rand.c:(.text+0x3d2): undefined reference to `sysctl'
collect2: error: ld returned 1 exit status
gmake[2]: *** [src/CMakeFiles/spock.dir/build.make:146: bin/spock] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:135: src/CMakeFiles/spock.dir/all] Error 2
gmake: *** [Makefile:146: all] Error 2
However, the same build on Github workflows on Ubuntu 20.04 works. What is weird. The only difference before apart the distribution version is that github wokflows use higher privileges than me on local (I believe?).
What I tried so far
I've been trying to read about what this sysctlreference is. And I found conflicting information:
Frrom this man page:
The sysctl() function retrieves system information and allows processes with appropriate privileges to set system information.
this similar SO question came to the conclusion that
Linux does not support this function (other OS like MacOS or FreeBSD support it)
A comment from the same post concludes that in Linux,
these details can be obtained by reading the kernel-provided
pseudofiles /proc/cpuinfo and /proc/meminfo
So here is my question: why does it compile at all on the remote server if this command is not supposed to exist on the OS used?
I'm trying to get rust working on android. However, when I try to cross-compile to android I get the following linking error:
$ cargo build --target=arm-linux-androideabi
Compiling <project> v0.1.0 (<project>)
error: linking with `/opt/android-sdk/ndk/23.0.7599858/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi31-clang` failed: exit status: 1
(very long toolchain command from cargo)
ld: error: unable to find library -lgcc
clang-12: error: linker command failed with exit code 1 (use -v to see invocation)
I have installed the ndk and changed the linker in .cargo/config to the android clang linker. I also tried the standalone toolchains with the same result. The guide I used was the following: https://mozilla.github.io/firefox-browser-architecture/experiments/2017-09-21-rust-on-android.html
Cross-compilation does work when using crate-type = ["rlib"] instead of crate-type = ["cdylib"], but I need an .so file not an .rlib file.
In case it's relevant, i'm using Manjaro Linux.
UPDATE:
I found the following pull request: https://github.com/rust-lang/rust/pull/85806 After switching to ndk22 it worked. I havn't tried if the pull request fixes the issue (probably does).
Without switching to an older NDK version, I found using the workaround provided by ssrlive to work for me. Here's their comment:
Fixing build error for NDK 23 and above
find out all the 4 folders containing file libunwind.a, in my PC,
it's
C:\Users\Administrator\AppData\Local\Android\Sdk\ndk\23.1.7779620\toolchains\llvm\prebuilt\windows-x86_64\lib64\clang\12.0.8\lib\linux\x86_64\
and more. create 4 text files named libgcc.a in the same folders
with this contents
INPUT(-lunwind)
reference
link
In macOS, the paths are
~/Library/Android/sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/darwin-x86_64/lib64/clang/14.0.1/lib/linux/i386/libunwind.a
~/Library/Android/sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/darwin-x86_64/lib64/clang/14.0.1/lib/linux/arm/libunwind.a
~/Library/Android/sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/darwin-x86_64/lib64/clang/14.0.1/lib/linux/aarch64/libunwind.a
~/Library/Android/sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/darwin-x86_64/lib64/clang/14.0.1/lib/linux/x86_64/libunwind.a
In Linux, the paths are
~/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/14.0.1/lib/linux/i386/libunwind.a
~/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/14.0.1/lib/linux/aarch64/libunwind.a
~/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/14.0.1/lib/linux/x86_64/libunwind.a
~/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/linux-x86_64/lib64/clang/14.0.1/lib/linux/arm/libunwind.a
In Windows, the paths are
~/AppData/Local/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/windows-x86_64/lib64/clang/14.0.1/lib/linux/aarch64/libunwind.a
~/AppData/Local/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/windows-x86_64/lib64/clang/14.0.1/lib/linux/arm/libunwind.a
~/AppData/Local/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/windows-x86_64/lib64/clang/14.0.1/lib/linux/i386/libunwind.a
~/AppData/Local/Android/Sdk/ndk/24.0.8215888/toolchains/llvm/prebuilt/windows-x86_64/lib64/clang/14.0.1/lib/linux/x86_64/libunwind.a
create file command in Linux/macOS
cat << EOF > libgcc.a
INPUT(-lunwind)
EOF
This is of course extremely brittle and not the "right" solution, but the workaround works fine as of 2022-10-12 with ndk version 25.1.8937393.
Undefined symbols for architecture i386: "_OBJC_CLASS_$_MKMapView"
Undefined symbols for architecture i386: "_OBJC_CLASS_$_MKMapView"
You have included the header, so you can compile your code, but you are not linking the binary library, so you can't complete the build process.
Follow these steps
-1.In your target settings, go to Build Phases
- 2.And in the "Link with binary libraries" section, add MapKit.framework .
I am trying to use mupdf in android application.I am using windows 7 and cygwin terminal.I used make but it gave error and
make NOX11=yes
execute successfully.
then i used ndk-build and it gives this error.
SharedLibrary : libmupdf.so
c:/android-ndk-r8b/toolchains/arm-linux-androideabi-4.6/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.6.x-google/../../../../arm-linux-androideabi/bin/ld.exe: ./obj/local/armeabi/libmupdfcore.a(pdf_fontfile.o)(.text.pdf_lookup_builtin_font+0x18): unresolvable R_ARM_THM_CALL relocation against symbol `strcmp'
c:/android-ndk-r8b/toolchains/arm-linux-androideabi-4.6/prebuilt/windows/bin/../lib/gcc/arm-linux-androideabi/4.6.x-google/../../../../arm-linux-androideabi/bin/ld.exe: final link failed: Nonrepresentable section on output
collect2: ld returned 1 exit status
/cygdrive/c/android-ndk-r8b/build/core/build-binary.mk:378: recipe for target `obj/local/armeabi/libmupdf.so' failed
make: *** [obj/local/armeabi/libmupdf.so] Error 1
please help me.I am new to android ndk.
Thank you.
This seems like a known issue. Try adding the line:
NDK_TOOLCHAIN_VERSION=4.4.3
to the file ..\android\jin\Application.mk. That will at least get rid of this particular error.
EDIT: Look here http://code.google.com/p/android/issues/detail?id=35393 for more information
UPDATE:
mupdf world is a murky one. Even the version of NDK vis-a-vis the version of mupdf (http://mupdf.com/download/archive/) you use will determine what sort of errors or warnings you get. From my experience, mupdf-0.9 (+mupdf-thirdparty-2011-02-24.zip) behaves well with android-ndk-r6b, while mupdf-1.1 (+mupdf-thirdparty-2012-08-14.zip) will behave just fine with android-ndk-r8b.
I have a CMake module to locate FreeGLUT:
FIND_PATH(FREEGLUT_INCLUDE_DIR NAMES GL/freeglut.h)
FIND_LIBRARY(FREEGLUT_LIBRARY NAMES freeglut freeglut_static)
SET(FREEGLUT_LIBRARIES ${FREEGLUT_LIBRARY})
SET(FREEGLUT_INCLUDE_DIRS ${FREEGLUT_INCLUDE_DIR})
INCLUDE(FindPackageHandleStandardArgs)
FIND_PACKAGE_HANDLE_STANDARD_ARGS(FreeGLUT DEFAULT_MSG FREEGLUT_LIBRARY FREEGLUT_INCLUDE_DIR)
MARK_AS_ADVANCED(FREEGLUT_INCLUDE_DIR FREEGLUT_LIBRARY)
It works fine and locates freeglut_static.lib when I generate NMake Makefiles on Windows. I'm attempting to statically link FreeGLUT into my DLL:
FIND_PACKAGE(FreeGLUT REQUIRED)
ADD_LIBRARY(vti SHARED ${VTI_SOURCES})
ADD_DEFINITIONS("-DBUILD_VTI=1 -DFREEGLUT_STATIC=1")
INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}/include ${FREEGLUT_INCLUDE_DIRS})
TARGET_LINK_LIBRARIES(vti ${FREEGLUT_LIBRARIES})
My source code builds correctly, but when it gets to the linking stage, VC++ fails with:
LINK : fatal error LNK1104: cannot open file 'freeglut.lib'
Which is strange since freeglut.lib isn't mentioned anywhere that I can see in the generated NMake makefiles. It should be trying to link with freeglut_static.lib, which CMake locates and sets in FREEGLUT_LIBRARIES.
What might be causing this?
This is caused with pragma directives in FreeGLUT code (see freeglut_std.h). Using FREEGLUT_STATIC should really fix that for you, but I think you should pass it to CMake without quotes: ADD_DEFINITIONS(-DBUILD_VTI -DFREEGLUT_STATIC)