Errors when updating to the newest version

[fosini]

Hello, I just updated to the newest version and I get a bunch of error messages when I try to start my go application now. Everything was working perfectly fine before the upgrade.

This is the list of all error messages:

In file included from /usr/local/go/pkg/src/github.com/bakape/thumbnailer/build_flags_gpl.go:10:
/usr/local/go/pkg/src/github.com/bakape/thumbnailer/libimagequant/libimagequant.c:158:30: warning: implicitly declaring library function 'vsnprintf' with type 'int (char *, unsigned long, const char *, struct __va_list_tag *)' [-Wimplicit-function-declaration]
/usr/local/go/pkg/src/github.com/bakape/thumbnailer/libimagequant/libimagequant.c:158:30: note: include the header <stdio.h> or explicitly provide a declaration for 'vsnprintf'
# github.com/bakape/thumbnailer
In file included from init.c:2:
In file included from /usr/local/Cellar/graphicsmagick/1.3.28_1/include/GraphicsMagick/magick/api.h:87:
/usr/local/Cellar/graphicsmagick/1.3.28_1/include/GraphicsMagick/magick/memory.h:17:48: warning: '__alloc_size__' attribute only applies to functions [-Wignored-attributes]
/usr/local/Cellar/graphicsmagick/1.3.28_1/include/GraphicsMagick/magick/common.h:188:70: note: expanded from macro 'MAGICK_FUNC_ALLOC_SIZE_1ARG'
In file included from init.c:2:
In file included from /usr/local/Cellar/graphicsmagick/1.3.28_1/include/GraphicsMagick/magick/api.h:87:
/usr/local/Cellar/graphicsmagick/1.3.28_1/include/GraphicsMagick/magick/memory.h:19:60: warning: '__alloc_size__' attribute only applies to functions [-Wignored-attributes]
/usr/local/Cellar/graphicsmagick/1.3.28_1/include/GraphicsMagick/magick/common.h:188:70: note: expanded from macro 'MAGICK_FUNC_ALLOC_SIZE_1ARG'
# github.com/bakape/thumbnailer
video.c:41:23: warning: address of array 'f->data' will always evaluate to 'true' [-Wpointer-bool-conversion]
video.c:79:59: warning: duplicate 'const' declaration specifier [-Wduplicate-decl-specifier]
video.c:124:39: warning: address of array 'frames[0]->data' will always evaluate to 'true' [-Wpointer-bool-conversion]
# github.com/bakape/thumbnailer
error: invalid value 'c++17' in '-std=c++17'

Can anyone help me with this? I just don't know what to do.

[bakape]

I changed some dependencies. You need a C++17 compiler and GraphicsMagick++ installed on your system.

[fosini]

After hours of trying, I finally managed to fix everything, thanks a lot. However, I still have one problem. If I try to build the app using the following command: GOOS=linux GOARCH=amd64 go build -o application application.go

then I receive following error message and the build fails: github.com/0xSeven/thumbnailer /usr/local/go/pkg/src/github.com/0xSeven/thumbnailer/main.go:20:2: undefined: Image Do you know how I can possibly fix that? I can run it without any problems in the IDE, but when I try to build it manually, I get this error message.

Anyways, thanks a lot for the help.

[bakape]

Are you cross-compiling?

[fosini]

Yes, I am.

[bakape]

Well that is very odd, considering it's on the Go side. Try checking for integrity with git status.

[fosini]

I already did. Everything works fine when I do not use the GOOS=linux option :(

[bakape]

Odd.

On 27 June 2018 at 21:56, 0xSeven notifications@github.com wrote:

I already did. Everything works fine when I do not use the GOOS=linux option :(

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/bakape/thumbnailer/issues/26#issuecomment-400792003, or mute the thread https://github.com/notifications/unsubscribe-auth/AHfPsDjG8Rx3cnhavvoCUPYyIqfEL7uOks5uA9VrgaJpZM4U5oYb .

[fosini]

Hello bakape. I switched to a linux envrionment now and when I try to run/build my app, I get following error message:

# github.com/0xSeven/thumbnailer
/usr/bin/ld: /usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-shear.o): undefined reference to symbol 'trunc@@GLIBC_2.2.5'
//lib/x86_64-linux-gnu/libm.so.6: error adding symbols: DSO missing from command line

I don't know what to do anymore, I tried everything I can to get this thing running. Please bakape, I beg you for help or hints. I'm just a go noob who tries to launch his first go app on an amazon ec2. Please, sir.

[bakape]

What distro+version is the running in the EC2 instance?

On 29 June 2018 at 17:22, 0xSeven notifications@github.com wrote:

Hello bakape. I switched to a linux envrionment now and when I try to run/build my app, I get following error message:

github.com/0xSeven/thumbnailer

/usr/bin/ld http://github.com/0xSeven/thumbnailer/usr/bin/ld: /usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-shear.o): undefined reference to symbol 'trunc@@GLIBC_2.2.5' //lib/x86_64-linux-gnu/libm.so.6: error adding symbols: DSO missing from command line

I don't know what to do anymore, I tried everything I can to get this thing running. Please bakape, I beg you for help or hints. I'm just a go noob who tries to launch his first go app on an amazon ec2. Please.

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[fosini]

Thanks for your quick response. I'm running Ubuntu 16.04.4 LTS.

[bakape]

github.com/0xSeven/thumbnailer http://github.com/0xSeven/thumbnailer/usr/bin/ld

Oh, it's a different repo. I think you are missing some CFLAGS. See https://github.com/bakape/thumbnailer/blob/master/thumbnailer.go#L3-L8

On 29 June 2018 at 17:28, 0xSeven notifications@github.com wrote:

Thanks for your quick response. I'm running Ubuntu 16.04.4 LTS.

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[fosini]

Hello bakape! I was using a 2 months old fork that was 12 commits behind the master. Well, I upgraded now everything to this repo, the newest version, and I'm still getting an undefined reference to symbol 'gzxclose' error (a different one this time):

-# github.com/bakape/thumbnailer
/usr/bin/ld: /usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-blob.o): undefined reference to symbol 'gzclose'
//lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from command line

[bakape]

Try installing zlib dev package. Might be an undocumented dependency on my part.

On 30 June 2018 at 15:53, 0xSeven notifications@github.com wrote:

Hello bakape! I was using a 2 months old fork that was 12 commits behind the master. Well, I upgraded now everything to this repo, the newest version, and I'm still getting an undefined reference to symbol 'gzxclose' error (a different one this time):

-# github.com/bakape/thumbnailer /usr/bin/ld http://github.com/bakape/thumbnailer/usr/bin/ld: /usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-blob.o): undefined reference to symbol 'gzclose' //lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from command line

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/bakape/thumbnailer/issues/26#issuecomment-401539440, or mute the thread https://github.com/notifications/unsubscribe-auth/AHfPsCQ0SvCRIy2ir8ynztO_h8P4_LLEks5uB3TcgaJpZM4U5oYb .

[fosini]

The latest version is already installed :( Thank you for trying to help me!

[fosini]

Hello bakape. I found out, that my EC2 instance (Ubuntu, 16.04.4 LTS) is unable to even get the library. If I type in the following command:

`go get -t github.com/bakape/thumbnailer

then I'm getting the same error message:

`-# github.com/bakape/thumbnailer /usr/bin/ld: /usr/bin/ld: /usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-blob.o): undefined reference to symbol 'gzclose' //lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from command line collect2: error: ld returned 1 exit status

I even created several SO Posts, one of them is: https://stackoverflow.com/questions/51091789/undefined-reference-to-symbol-gzclose-error-when-getting-library-go

After days of trying to fix this, I strongly believe that the library's Makefile or build-flags is causing this error.

Greetings!

[bakape]

Just to be sure, run go get -u -v -x github.com/bakape/thumbnailer and post the output here.

I strongly believe that the library's Makefile is causing this error.

What made you think that? AFAIK Go does not take into account any Makefiles in the project.

[fosini]

This is the raw output of the command:

ubuntu@root:~$ go get -u -v -x github.com/bakape/thumbnailer
cd /home/ubuntu/go/src/github.com/bakape/thumbnailer
git config remote.origin.url
github.com/bakape/thumbnailer (download)
cd /home/ubuntu/go/src/github.com/bakape/thumbnailer
git pull --ff-only
cd /home/ubuntu/go/src/github.com/bakape/thumbnailer
git submodule update --init --recursive
cd /home/ubuntu/go/src/github.com/bakape/thumbnailer
git show-ref
cd /home/ubuntu/go/src/github.com/bakape/thumbnailer
git submodule update --init --recursive
WORK=/tmp/go-build312713059
github.com/bakape/thumbnailer
mkdir -p $WORK/github.com/bakape/thumbnailer/_obj/
mkdir -p $WORK/github.com/bakape/
cd /home/ubuntu/go/src/github.com/bakape/thumbnailer
pkg-config --cflags libavcodec libavutil libavformat GraphicsMagick++ libavcodec libavutil libavformat libswscale
pkg-config --libs libavcodec libavutil libavformat GraphicsMagick++ libavcodec libavutil libavformat libswscale
CGO_LDFLAGS="-g" "-O2" "-lm" "-L/usr/local/lib" "-lGraphicsMagick++" "-lGraphicsMagick" "-lavcodec" "-lavutil" "-lavformat" "-lswscale" /usr/local/go/pkg/tool/linux_amd64/cgo -objdir $WORK/github.com/bakape/thumbnailer/_obj/ -importpath github.com/bakape/thumbnailer -- -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 audio.go buf.go build_flags_gpl.go ffmpeg.go meta.go thumbnailer.go video.go
cd $WORK
gcc -fdebug-prefix-map=a=b -c trivial.c
gcc -gno-record-gcc-switches -c trivial.c
cd $WORK/github.com/bakape/thumbnailer/_obj
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./_cgo_export.o -c _cgo_export.c
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./audio.cgo2.o -c audio.cgo2.c
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./buf.cgo2.o -c buf.cgo2.c
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./build_flags_gpl.cgo2.o -c build_flags_gpl.cgo2.c
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./ffmpeg.cgo2.o -c ffmpeg.cgo2.c
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./meta.cgo2.o -c meta.cgo2.c
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./thumbnailer.cgo2.o -c thumbnailer.cgo2.c
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./video.cgo2.o -c video.cgo2.c
cd /home/ubuntu/go/src/github.com/bakape/thumbnailer
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o $WORK/github.com/bakape/thumbnailer/_obj/audio.o -c audio.c
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o $WORK/github.com/bakape/thumbnailer/_obj/ffmpeg.o -c ffmpeg.c
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o $WORK/github.com/bakape/thumbnailer/_obj/init.o -c init.c
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o $WORK/github.com/bakape/thumbnailer/_obj/meta.o -c meta.c
gcc -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o $WORK/github.com/bakape/thumbnailer/_obj/video.o -c video.c
g++ -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/lodepng -std=c++17 -O3 -o $WORK/github.com/bakape/thumbnailer/_obj/compress_png.cc.o -c compress_png.cc
g++ -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/lodepng -std=c++17 -O3 -o $WORK/github.com/bakape/thumbnailer/_obj/thumbnailer.cc.o -c thumbnailer.cc
g++ -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I $WORK/github.com/bakape/thumbnailer/_obj/ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/lodepng -std=c++17 -O3 -o $WORK/github.com/bakape/thumbnailer/_obj/util.cc.o -c util.cc
cd $WORK/github.com/bakape/thumbnailer/_obj
gcc -I /home/ubuntu/go/src/github.com/bakape/thumbnailer -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -I/usr/local/include/GraphicsMagick -I/usr/include/x86_64-linux-gnu -I ./ -g -O2 -I/home/ubuntu/go/src/github.com/bakape/thumbnailer/libimagequant -std=c11 -std=c11 -O3 -D_POSIX_C_SOURCE -std=c11 -o ./_cgo_main.o -c _cgo_main.c
cd /home/ubuntu/go/src/github.com/bakape/thumbnailer
g++ -I . -fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=$WORK=/tmp/go-build -gno-record-gcc-switches -o $WORK/github.com/bakape/thumbnailer/_obj/_cgo_.o $WORK/github.com/bakape/thumbnailer/_obj/_cgo_main.o $WORK/github.com/bakape/thumbnailer/_obj/_cgo_export.o $WORK/github.com/bakape/thumbnailer/_obj/audio.cgo2.o $WORK/github.com/bakape/thumbnailer/_obj/buf.cgo2.o $WORK/github.com/bakape/thumbnailer/_obj/build_flags_gpl.cgo2.o $WORK/github.com/bakape/thumbnailer/_obj/ffmpeg.cgo2.o $WORK/github.com/bakape/thumbnailer/_obj/meta.cgo2.o $WORK/github.com/bakape/thumbnailer/_obj/thumbnailer.cgo2.o $WORK/github.com/bakape/thumbnailer/_obj/video.cgo2.o $WORK/github.com/bakape/thumbnailer/_obj/audio.o $WORK/github.com/bakape/thumbnailer/_obj/ffmpeg.o $WORK/github.com/bakape/thumbnailer/_obj/init.o $WORK/github.com/bakape/thumbnailer/_obj/meta.o $WORK/github.com/bakape/thumbnailer/_obj/video.o $WORK/github.com/bakape/thumbnailer/_obj/compress_png.cc.o $WORK/github.com/bakape/thumbnailer/_obj/thumbnailer.cc.o $WORK/github.com/bakape/thumbnailer/_obj/util.cc.o -g -O2 -lm -L/usr/local/lib -lGraphicsMagick++ -lGraphicsMagick -lavcodec -lavutil -lavformat -lswscale
# github.com/bakape/thumbnailer
/usr/bin/ld: /usr/local/lib/libGraphicsMagick.a(magick_libGraphicsMagick_la-blob.o): undefined reference to symbol 'gzclose'
//lib/x86_64-linux-gnu/libz.so.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

Well, people who encountered the same error fixed this by modifying the Makefile.

Best regards!

[fosini]

Hey bakape. Sorry if I keep annoying you, but please help me one last time. On the last few lines the: g++ -I . -fPIC -m64 -pthread x ......... command - is there any way to provide a -lz option when using go get? I think adding -lz at the end will fix everything.

[bakape]

Well, people who encountered the same error fixed this by modifying the Makefile.

Because they actually use makefiles to build.

/usr/local/lib/libGraphicsMagick.a

You built a local static GraphicsMagick, so any incompatibility stems from this. Try adding -extldflags="-lz" to the command line.

[fosini]

All those errors really are because of the static GraphicsMagick build. Now everything runs fine. I love you, dude! You helped me so much in my life, thank you so much!