[英]ldd -r -v How do I add version symbol to file?
Version information:
./VideoEncoderFilter.so:
libgcc_s.so.1 (GCC_3.0) => /lib/x86_64-linux-gnu/libgcc_s.so.1
libva.so.1 (VA_API_0.34.0) => not found
libdl.so.2 (GLIBC_2.2.5) => /lib/x86_64-linux-gnu/libdl.so.2
libstdc++.so.6 (GLIBCXX_3.4.20) => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
libstdc++.so.6 (CXXABI_1.3.8) => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
libstdc++.so.6 (CXXABI_1.3.9) => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
libstdc++.so.6 (CXXABI_1.3) => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
libstdc++.so.6 (GLIBCXX_3.4.15) => /usr/lib/x86_64-linux-gnu/libstdc++.so.6
I am curious how this version symbol VA_API_0.34.0
added to VideoEncoderFilter.so
.我很好奇这个版本符号
VA_API_0.34.0
如何添加到VideoEncoderFilter.so
。
If I have a foo.c and I want to create a version symbol FOO_API_0.34.0
, what do I do?如果我有一个 foo.c 并且我想创建一个版本符号
FOO_API_0.34.0
,我该怎么办?
gcc -c -fPIC foo.c -o foo.o
gcc foo.o -shared -o libfoo.so
GNU ld supports version scripts . GNU ld 支持版本脚本。 If you want to add the version
FOO_API_0.34.0
to the symbol foo
, you can do it like this:如果要将版本
FOO_API_0.34.0
添加到符号foo
,可以这样做:
$ cat libfoo.versions
FOO_API_0.34.0 {
global: foo;
};
$ gcc -c -fPIC foo.c -o foo.o
$ gcc foo.o -shared -o libfoo.so -Wl,--version-script=libfoo.versions
You can verify that the symbol is there using readelf
:您可以使用
readelf
验证符号是否存在:
$ readelf --dyn-syms -W libfoo.so
Symbol table '.dynsym' contains 7 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _ITM_deregisterTMCloneTable
2: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__
3: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _ITM_registerTMCloneTable
4: 0000000000000000 0 FUNC WEAK DEFAULT UND __cxa_finalize@GLIBC_2.2.5 (3)
5: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS FOO_API_0.34.0
6: 00000000000010f5 11 FUNC GLOBAL DEFAULT 12 foo@@FOO_API_0.34.0
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.