奇怪，这个buildroot Qt5依赖的库路径好神奇

memory · 2024-07-19 11:56:07

$ /opt/A133/buildroot/buildroot-20200212-Qt/output/host/bin/aarch64-linux-gnu-objdump -x qopenglwindow/qopenglwindow |grep NEED
  NEEDED               libatomic.so.1
  NEEDED               libQt5Gui.so.5
  NEEDED               libQt5Core.so.5
  NEEDED               /opt/A133/buildroot/buildroot-20200212-Qt/output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libGLESv2.so
  NEEDED               /opt/A133/buildroot/buildroot-20200212-Qt/output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libGLESv1_CM.so
  NEEDED               libpthread.so.0
  NEEDED               librt.so.1
  NEEDED               libdl.so.2
  NEEDED               libstdc++.so.6
  NEEDED               libm.so.6
  NEEDED               libgcc_s.so.1
  NEEDED               libc.so.6
  VERNEED              0x0000000000403540
  VERNEEDNUM           0x0000000000000004

QQ截图20240719115454.png

memory · 2024-07-19 17:31:53

不知道是不是buildroot的eglfs的bug，生成的elf都是依赖绝对路径

找到patchelf 命令可以直接修改elf文件：

patchelf --replace-needed /opt/A133/buildroot/buildroot-20200212-Qt/output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libGLESv2.so libGLESv2.so qopenglwindow/qopenglwindow

patchelf --replace-needed /opt/A133/buildroot/buildroot-20200212-Qt/output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/libGLESv1_CM.so libGLES_CM.so qopenglwindow/qopenglwindow

看结果：

$ /opt/A133/buildroot/buildroot-20200212-Qt/output/host/bin/aarch64-linux-gnu-objdump -x /opt/A133/buildroot/buildroot-20200212-Qt/output/build/qt5base-5.12.9/examples/opengl/qopenglwindow/qopenglwindow |grep NEED
  NEEDED               libatomic.so.1
  NEEDED               libQt5Gui.so.5
  NEEDED               libQt5Core.so.5
  NEEDED               libGLESv2.so
  NEEDED               libGLES_CM.so
  NEEDED               libpthread.so.0
  NEEDED               librt.so.1
  NEEDED               libdl.so.2
  NEEDED               libstdc++.so.6
  NEEDED               libm.so.6
  NEEDED               libgcc_s.so.1
  NEEDED               libc.so.6
  VERNEED              0x0000000000403540
  VERNEEDNUM           0x0000000000000004

参考： https://forum.qt.io/topic/101590/absolute-paths-to-egl-library-in-libqt5gui-so-since-qt-5-12-1/13

memory · 2024-07-19 17:34:16

这里有人提出同样的问题：

The output of readelf shows this issue:
$ arm-linux-gnueabihf-readelf -a qtbase/lib/libQt5Gui.so | grep "Shared library"
readelf: Warning: [ 9]: Info field (0) should index a relocatable section.
0x00000001 (NEEDED) Shared library: [libQt5Core.so.5]
0x00000001 (NEEDED) Shared library: [libpthread.so.0]
0x00000001 (NEEDED) Shared library: [/home/developer/proyectos/Odroid/RootFS/usr/lib/arm-linux-gnueabihf/libGLESv2.so]
0x00000001 (NEEDED) Shared library: [/home/developer/proyectos/Odroid/RootFS/usr/lib/arm-linux-gnueabihf/libEGL.so]
0x00000001 (NEEDED) Shared library: [libpng16.so.16]
0x00000001 (NEEDED) Shared library: [libz.so.1]
0x00000001 (NEEDED) Shared library: [libstdc++.so.6]
0x00000001 (NEEDED) Shared library: [libm.so.6]
0x00000001 (NEEDED) Shared library: [libgcc_s.so.1]
0x00000001 (NEEDED) Shared library: [libc.so.6]

I've seen something related to this issue in QTBUG-7290

https://forum.qt.io/topic/104015/cross-compilation-generates-full-paths-in-libqt5gui-so-for-libglesv2-so-and-libgl-so-then-cannot-be-found-in-execution-time

https://forum.qt.io/topic/101590/absolute-paths-to-egl-library-in-libqt5gui-so-since-qt-5-12-1

memory · 2024-07-19 17:54:18

跟踪了一下，貌似 so 文件缺 SONAME 节点引起：

$ /opt/A133/buildroot/buildroot-20200212-Qt/output/host/bin/aarch64-linux-gnu-readelf -d ./output/build/sunxi-mali-mainline-d691cb93884ca8ac67860502117bbec283dc19aa/r6p2/arm64/fbdev/libGLESv2.so |grep SONAME
$
$

$ /opt/A133/buildroot/buildroot-20200212-Qt/output/host/bin/aarch64-linux-gnu-readelf -d /opt/A133/tina4/package/libs/libgpu/ge8300/fbdev/glibc/lib64/libGLESv2.so |grep SONAME
 0x000000000000000e (SONAME)             Library soname: [libGLESv2.so.2]
$
$

memory · 2024-07-23 09:50:11

搞定了，换另外一套带SONAME节点的so文件库就好了。

另外一个解决办法，给这些so文件用patchelf手动打上SONAME也可以解决，但是我没有测试。

WhyCan Forum(哇酷开发者社区)

楼主 # 2024-07-19 11:56:07 分享评论

奇怪，这个buildroot Qt5依赖的库路径好神奇

楼主 #1 2024-07-19 17:31:53 分享评论

Re: 奇怪，这个buildroot Qt5依赖的库路径好神奇

楼主 #2 2024-07-19 17:34:16 分享评论

Re: 奇怪，这个buildroot Qt5依赖的库路径好神奇

楼主 #3 2024-07-19 17:54:18 分享评论

Re: 奇怪，这个buildroot Qt5依赖的库路径好神奇

楼主 #4 2024-07-23 09:50:11 分享评论

Re: 奇怪，这个buildroot Qt5依赖的库路径好神奇

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