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nanomsg / nng

nanomsg-next-generation -- light-weight brokerless messaging
https://nng.nanomsg.org
MIT License
3.78k stars 483 forks source link

Excessive Warnings building for Android #561

Closed jonmcclung closed 6 years ago

jonmcclung commented 6 years ago

Note that by filing an issue, you agree that you have read and agreed to our contribution guidelines.

NNG & Platform details.

NNG version 1.0.0 (commit 63418ae) host platform: macOS 10.12.5 target platform: Android armv7a API level 26 using clang

Expected Behavior

I am trying to compile NNG for Android. I am using the standalone toolchain generated by android-ndk-r17b/build/tools/make_standalone_toolchain.py --arch arm --api 26. The expected behavior is that I would generate a static NNG library that I could use in my project.

Actual Behavior

Effectively, there is an option -Wl,-search_paths_first which is somehow being added to the linker options (I have searched all project files and been unable to determine where it is being added). This is not being interpreted correctly by the linker, it somehow thinks I want to define the entry symbol to be arch_paths_first. Of course, no such entry symbol is defined, so I get the warning multiple times.

Note: It appears that the target is still being built properly in the end. I can't be certain, though, because the project I'm building is being ported to Android and there are still other dependencies I haven't gotten working yet, so I can't say whether or not NNG will give me problems when everything else is done. Still, I would prefer a fix or at least a workaround since this seems like something fairly basic.

Steps to Reproduce

I have a build script build.sh that should be placed in the directory above nng-master:

#!/bin/bash

cd nng-master

make clean
rm CMakeCache.txt Makefile

# $STANDALONE is just the_standalone_toolchain/bin
target_host=$STANDALONE/arm-linux-androideabi
export AR=$target_host-ar
export AS=$target_host-as
export CC=$target_host-clang
export CXX=$target_host-clang++
export LD=$target_host-ld
export STRIP=$target_host-strip
export RANLIB=$target_host-ranlib

export CFLAGS="-march=armv7a -mfloat-abi=softfp -mfpu=vfpv3-d16 -fPIE -fPIC"
export CPPFLAGS="-D__ANDROID_API__=26"
export LDFLAGS="-pie -march=armv7a"

export CMAKEFLAGS="-DNNG_TESTS=OFF -DCMAKE_SYSTEM_NAME=\"Android\""

cmake "$CMAKEFLAGS" . 
printf "\n\ncmake has finished\n\n"

make V=1
printf "\n\nmake has run\n\n"

# This is necessary because cmake picks the wrong ranlib, even though we have exported it above.
$RANLIB *.a
printf "\n\nranlib finished\n\n"

make V=1
printf "\n\nmake has run again\n\n"

The following is the output of running build.sh:

$ ./build.sh
make: *** No rule to make target `clean'.  Stop.
rm: CMakeCache.txt: No such file or directory
rm: Makefile: No such file or directory
-- The C compiler identification is Clang 6.0.2
-- Check for working C compiler: /Users/jonmcclung/Library/Android/sdk/ndk-bundle/toolchains/standalone-armv7a-26/bin/arm-linux-androideabi-clang
-- Check for working C compiler: /Users/jonmcclung/Library/Android/sdk/ndk-bundle/toolchains/standalone-armv7a-26/bin/arm-linux-androideabi-clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Found UnixCommands: /bin/bash
-- Check if the system is big endian
-- Searching 16 bit integer
-- Looking for sys/types.h
-- Looking for sys/types.h - found
-- Looking for stdint.h
-- Looking for stdint.h - found
-- Looking for stddef.h
-- Looking for stddef.h - found
-- Check size of unsigned short
-- Check size of unsigned short - done
-- Using unsigned short
-- Check if the system is big endian - little endian
-- Performing Test NNG_HIDDEN_VISIBILITY
-- Performing Test NNG_HIDDEN_VISIBILITY - Success
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - found
-- Found Threads: TRUE
-- Looking for lockf
-- Looking for lockf - found
-- Looking for flock
-- Looking for flock - found
-- Looking for clock_gettime in rt
-- Looking for clock_gettime in rt - not found
-- Looking for sem_wait in pthread
-- Looking for sem_wait in pthread - not found
-- Looking for gethostbyname in nsl
-- Looking for gethostbyname in nsl - not found
-- Looking for socket in socket
-- Looking for socket in socket - not found
-- Looking for AF_UNIX
-- Looking for AF_UNIX - found
-- Looking for backtrace_symbols_fd
-- Looking for backtrace_symbols_fd - not found
-- Looking for alloca
-- Looking for alloca - found
-- Performing Test NNG_HAVE_MSG_CONTROL
-- Performing Test NNG_HAVE_MSG_CONTROL - Success
-- Looking for kqueue
-- Looking for kqueue - not found
-- Looking for port_create
-- Looking for port_create - not found
-- Looking for epoll_create
-- Looking for epoll_create - found
-- Looking for epoll_create1
-- Looking for epoll_create1 - found
-- Looking for getpeereid
-- Looking for getpeereid - not found
-- Looking for SO_PEERCRED
-- Looking for SO_PEERCRED - found
-- Looking for LOCAL_PEERCRED
-- Looking for LOCAL_PEERCRED - not found
-- Looking for getpeerucred
-- Looking for getpeerucred - not found
-- Looking for strlcat
-- Looking for strlcat - found
-- Looking for strlcpy
-- Looking for strlcpy - found
-- Looking for strnlen
-- Looking for strnlen - found
-- Looking for strcasecmp
-- Looking for strcasecmp - found
-- Looking for strncasecmp
-- Looking for strncasecmp - found
-- Building static libs
-- Test tls disabled (unconfigured)
-- Test wss disabled (unconfigured)
-- Test wssfile disabled (unconfigured)
-- Test zt disabled (unconfigured)
-- The CXX compiler identification is Clang 6.0.2
-- Check for working CXX compiler: /Users/jonmcclung/Library/Android/sdk/ndk-bundle/toolchains/standalone-armv7a-26/bin/arm-linux-androideabi-clang++
-- Check for working CXX compiler: /Users/jonmcclung/Library/Android/sdk/ndk-bundle/toolchains/standalone-armv7a-26/bin/arm-linux-androideabi-clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /Users/jonmcclung/Workspace/uxpKits/nnghome/nng-master

cmake has finished

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warning: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib: warning for library: ../libnng.a the table of contents is empty (no object file members in the library define global symbols)
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/Users/jonmcclung/Library/Android/sdk/ndk-bundle/toolchains/standalone-armv7a-26/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: error: ../libnng.a: no archive symbol table (run ranlib)
/Users/jonmcclung/Library/Android/sdk/ndk-bundle/toolchains/standalone-armv7a-26/bin/../lib/gcc/arm-linux-androideabi/4.9.x/../../../../arm-linux-androideabi/bin/ld: warning: cannot find entry symbol 'arch_paths_first'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_pair1_open'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_strerror'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_pair1_open'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_strerror'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_listen'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_strerror'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_dial'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_strerror'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_send'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_recv'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_send'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_recv'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_close'
CMakeFiles/cplusplus_pair.dir/cplusplus_pair.cc.o:cplusplus_pair.cc:function main: error: undefined reference to 'nng_close'
clang60++: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [tests/cplusplus_pair] Error 1
make[1]: *** [tests/CMakeFiles/cplusplus_pair.dir/all] Error 2
make: *** [all] Error 2

make has run

ranlib finished

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make has run again
gdamore commented 6 years ago

Please have a look at the docs/BUILD_ANDROID.adoc document -- see here https://github.com/nanomsg/nng/blob/master/docs/BUILD_ANDROID.adoc

Specifically what is happening is that your overrides lack enough information for CMake to realize that it is being built for an embedded target, so it is automatically trying to build shared libraries and tests which are inappropriate for your target.

The normal usage with CMake for such targets is to pass CMake a toolchain file, which specifies those things, instead of by overriding individual variables in the environment. The presence of the toolchain file indicates a cross-compile situation, which affects the behavior accordingly.

If you don't want to use a toolchain file, you can use instead an undocumented setting, NNG_NATIVE_BUILD (which should be set to OFF) which should cause the same effects, or you could manually disable tests and tools with NNG_TESTS=OFF and NNG_TOOLS=OFF (and also set BUILD_SHARED_LIBS=OFF as well.)

jonmcclung commented 6 years ago

That document proved to be very helpful. I did ultimately have to manually call ranlib, but other than that it built without errors. Thank you.

gdamore commented 6 years ago

I’m surprised you needed to run ranlib. I’m a little concerned about that.

On Mon, Jul 2, 2018 at 12:02 PM Jon McClung notifications@github.com wrote:

Closed #561 https://github.com/nanomsg/nng/issues/561.

— You are receiving this because you commented.

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jonmcclung commented 6 years ago

I think that may just be an issue on my end, because I had to do it with another dependency as well.

gdamore commented 6 years ago

ok. let me know if you have the same issue when starting from scratch using the directions in that BUILDING doc.

jonmcclung commented 6 years ago

@gdamore I fixed the issue with my toolchain today and can confirm that it was not necessary to manually call ranlib.