run example failed

[wangshankun]

cargo run --example h264_video_dec

ffmpeg-dev-rs/target/debug/deps/libffmpeg_dev-def21d6af90e43d1.rlib(allcodecs.o): relocation R_X86_64_32S against `.rodata' can not be used when making a shared object; recompile with -fPIC

[colbyn]

Can you give me the full output, as well as your OS?

From what you provided I don't know if this is an issue with Cargo/rustc or compiling FFmpeg C source files.

[runfalk]

I have same issue. I run Fedora 31 with the following packages installed:

• llvm (9.0)
• llvm-devel
• clang (9.0)
• make

Rust version is 1.40.

Log (I've removed 750 lines that were repeated for different functions):

   Compiling ffmpeg-dev v0.3.8 (/home/<redacted>/dev/ffmpeg-dev-rs)
warning: cbits/img_utils.c: In function ‘mp4_packager’:
warning: cbits/img_utils.c:248: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
warning:   248 |         #pragma clang diagnostic ignored "-Wdeprecated-declarations"
warning:       |
warning: cbits/img_utils.c:249:14: warning: ‘codec’ is deprecated [-Wdeprecated-declarations]
warning:   249 |         enum AVCodecID codec_id = ifmt_ctx->streams[stream_index]->codec->codec_id;
warning:       |              ^~~~~~~~~
warning: In file included from cbits/img_utils.c:26:
warning: /home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavformat/avformat.h:885:21: note: declared here
warning:   885 |     AVCodecContext *codec;
warning:       |                     ^~~~~
warning: cbits/img_utils.c: At top level:
warning: cbits/img_utils.c:477: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
warning:   477 | #pragma clang diagnostic ignored "-Wunused-parameter"
warning:       |
warning: cbits/img_utils.c: In function ‘decode_packet’:
warning: cbits/img_utils.c:488: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
warning:   488 |         #pragma clang diagnostic ignored "-Wdeprecated-declarations"
warning:       |
warning: cbits/img_utils.c:489:9: warning: ‘avcodec_decode_video2’ is deprecated [-Wdeprecated-declarations]
warning:   489 |         int res = avcodec_decode_video2(
warning:       |         ^~~
warning: In file included from /home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavformat/avformat.h:317,
warning:                  from cbits/img_utils.c:26:
warning: /home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavcodec/avcodec.h:4828:5: note: declared here
warning:  4828 | int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
warning:       |     ^~~~~~~~~~~~~~~~~~~~~
warning: cbits/img_utils.c:482:9: warning: unused parameter ‘cached’ [-Wunused-parameter]
warning:   482 |     int cached,
warning:       |     ~~~~^~~~~~
error: linking with `cc` failed: exit code: 1
  |
  = note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.1a8no36a90z3hcmg.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.1d61my7gjy3z8d2q.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.1mw3w21l9rn7xuct.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.1pigp6p5k1mu1ww1.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.1zht1aluxy3xre4k.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.23fggphb7mq833q1.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.2blphq0gxelevwf9.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.2ks1yk2pf6hlplix.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.2nesbchceuqulkul.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.2qpla8462t19dlqb.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.2xq9pnogv9wbs1zh.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.3286ufqx1gzjfasi.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.32fxi55kt2yt48mp.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.33zdsr4vuuvhgbjp.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.35iti2ik04yd0c1x.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.3c7xbdudwqpqkbef.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.3ibegbm8uitwxdtn.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.3o57p8oy67s9oy2x.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.409k68riaxm8wj18.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.43tpp96r2i22rmfd.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.455x3cljdqojd5at.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.46z90g57199ngy7l.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.497rpn5vq3l6da0c.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.4j3qy5n8m0ma7or6.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.4lpd3rfdrotqksso.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.4n63po549xra3s1a.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.4qp01hxls96kazwb.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.4upmq93n8qpvbhmu.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.4uxwxa0pbqrsqdkn.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.52tbwj9e9l72vjjt.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.5dwi768kji5frpou.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.ad4qhfvdmvvghb3.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.djvg3cgqav1odp.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.hlmfljp9t1ud1kw.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.hx4lopwmdwetol5.rcgu.o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.oy1eo0iv926l14y.rcgu.o" "-o" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/examples/h264_video_dec-1fa5fbb20a3fe943.1ttqzqaq48r232gv.rcgu.o" "-Wl,--gc-sections" "-pie" "-Wl,-zrelro" "-Wl,-znow" "-nodefaultlibs" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/deps" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavcodec" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavdevice" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavfilter" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavformat" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavresample" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavutil" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libpostproc" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libswresample" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libswscale" "-L" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out" "-L" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/deps/libffmpeg_dev-9a74f2e39a617786.rlib" "/home/<redacted>/dev/ffmpeg-dev-rs/target/debug/deps/liblibc-52f675a24655d4b8.rlib" "-Wl,--start-group" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-74488c47a41eb313.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-efbc2c947951b8cc.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libhashbrown-b177382d9a04ffbe.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_alloc-ba7d2244d33447d5.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace-39569dc87e4ea301.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libbacktrace_sys-cd9e255bd82ddb5c.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_demangle-f83165e777dccb8d.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-10b085de263b1750.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcfg_if-9a4a22edf44da957.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-68fabc677efa98de.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-026dc0061b48e8b6.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librustc_std_workspace_core-7bf75bb619341145.rlib" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-ef54709e300503ed.rlib" "-Wl,--end-group" "/home/<redacted>/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-4ed27d8420cb4abc.rlib" "-Wl,-Bdynamic" "-lutil" "-lutil" "-ldl" "-lrt" "-lpthread" "-lgcc_s" "-lc" "-lm" "-lrt" "-lpthread" "-lutil" "-lutil"
  = note: /usr/bin/ld: /home/<redacted>/dev/ffmpeg-dev-rs/target/debug/deps/libffmpeg_dev-9a74f2e39a617786.rlib(allcodecs.o): relocation R_X86_64_32S against `.rodata' can not be used when making a PIE object; recompile with -fPIC
          ... < this repeats for about 750 lines > ...
          /usr/bin/ld: /home/<redacted>/dev/ffmpeg-dev-rs/target/debug/deps/libffmpeg_dev-9a74f2e39a617786.rlib(v4l2_buffers.o): relocation R_X86_64_32S against `.rodata' can not be used when making a PIE object; recompile with -fPIC
          /usr/bin/ld: final link failed: nonrepresentable section on output
          collect2: error: ld returned 1 exit status

error: aborting due to previous error

The following warnings were emitted during compilation:

warning: cbits/img_utils.c: In function ‘mp4_packager’:
warning: cbits/img_utils.c:248: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
warning:   248 |         #pragma clang diagnostic ignored "-Wdeprecated-declarations"
warning:       |
warning: cbits/img_utils.c:249:14: warning: ‘codec’ is deprecated [-Wdeprecated-declarations]
warning:   249 |         enum AVCodecID codec_id = ifmt_ctx->streams[stream_index]->codec->codec_id;
warning:       |              ^~~~~~~~~
warning: In file included from cbits/img_utils.c:26:
warning: /home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavformat/avformat.h:885:21: note: declared here
warning:   885 |     AVCodecContext *codec;
warning:       |                     ^~~~~
warning: cbits/img_utils.c: At top level:
warning: cbits/img_utils.c:477: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
warning:   477 | #pragma clang diagnostic ignored "-Wunused-parameter"
warning:       |
warning: cbits/img_utils.c: In function ‘decode_packet’:
warning: cbits/img_utils.c:488: warning: ignoring #pragma clang diagnostic [-Wunknown-pragmas]
warning:   488 |         #pragma clang diagnostic ignored "-Wdeprecated-declarations"
warning:       |
warning: cbits/img_utils.c:489:9: warning: ‘avcodec_decode_video2’ is deprecated [-Wdeprecated-declarations]
warning:   489 |         int res = avcodec_decode_video2(
warning:       |         ^~~
warning: In file included from /home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavformat/avformat.h:317,
warning:                  from cbits/img_utils.c:26:
warning: /home/<redacted>/dev/ffmpeg-dev-rs/target/debug/build/ffmpeg-dev-3320b23ae77d27ac/out/FFmpeg-FFmpeg-2722fc2/libavcodec/avcodec.h:4828:5: note: declared here
warning:  4828 | int avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,
warning:       |     ^~~~~~~~~~~~~~~~~~~~~
warning: cbits/img_utils.c:482:9: warning: unused parameter ‘cached’ [-Wunused-parameter]
warning:   482 |     int cached,
warning:       |     ~~~~^~~~~~

error: could not compile `ffmpeg-dev`.

To learn more, run the command again with --verbose.

[runfalk]

I managed to get it to compile using RUSTFLAGS='-C relocation-model=dynamic-no-pic -C link-args=-no-pie' cargo run, but I'd prefer if it worked without these flags.