Centos编译报错

[fishfly123]

lwan-request.c:(.text+0xe79): undefined reference to __builtin_expect_with_probability' lwan-request.c:(.text+0x12ad): undefined reference to __builtin_expect_with_probability'
lwan-request.c:(.text+0x1485): undefined reference to __builtin_expect_with_probability' lwan-request.c:(.text+0x19b8): undefined reference to __builtin_expect_with_probability'
lwan-request.c:(.text+0x1b7a): undefined reference to __builtin_expect_with_probability' ../../lib/liblwan.a(lwan-request.c.o):lwan-request.c:(.text+0x1d79): more undefined references to __builtin_expect_with_probability' follow
collect2: error: ld returned 1 exit status
make[2]: *** [src/bin/lwan/lwan] Error 1
make[1]: *** [src/bin/lwan/CMakeFiles/lwan.dir/all] Error 2
make: *** [all] Error 2

[lpereira]

Hi. Old compilers aren't well supported. It should be possible to build without this built-in, but there are probably other places where the code relies on things that aren't supported in old compilers. Feel free to send a patch, though! I don't have the time to support Lwan on platforms, or with compilers that I don't use, but if someone fixes this, then I'll merge their patch just fine.

…

On Thu, Apr 28, 2022, at 9:25 PM, fishfly123 wrote: lwan-request.c:(.text+0xe79): undefined reference to `__builtin_expect_with_probability' lwan-request.c:(.text+0x12ad): undefined reference to `__builtin_expect_with_probability' lwan-request.c:(.text+0x1485): undefined reference to `__builtin_expect_with_probability' lwan-request.c:(.text+0x19b8): undefined reference to `__builtin_expect_with_probability' lwan-request.c:(.text+0x1b7a): undefined reference to `__builtin_expect_with_probability' ../../lib/liblwan.a(lwan-request.c.o):lwan-request.c:(.text+0x1d79): more undefined references to `__builtin_expect_with_probability' follow collect2: error: ld returned 1 exit status make[2]: *** [src/bin/lwan/lwan] Error 1 make[1]: *** [src/bin/lwan/CMakeFiles/lwan.dir/all] Error 2 make: *** [all] Error 2 — Reply to this email directly, view it on GitHub <#342>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAADVGKX5PQAGRLA3ZALEY3VHNJDZANCNFSM5UUOX6AA>. You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[fishfly123]

你好。旧的编译器没有得到很好的支持。应该可以在没有这个内置的情况下进行构建，但可能在其他地方代码依赖于旧编译器不支持的东西。不过，请随意发送补丁！我没有时间在平台上支持 Lwan，或者使用我不使用的编译器，但如果有人修复了这个问题，那么我会合并他们的补丁就好了。
…
On Thu, Apr 28, 2022, at 9:25 PM, fishfly123 wrote: lwan-request.c:(.text+0xe79): undefined reference to __builtin_expect_with_probability' lwan-request.c:(.text+0x12ad): undefined reference to __builtin_expect_with_probability' lwan-request.c:(.text+0x1485): undefined reference to __builtin_expect_with_probability' lwan-request.c:(.text+0x19b8): undefined reference to __builtin_expect_with_probability' lwan-request.c:(.text+0x1b7a): undefined reference to __builtin_expect_with_probability' ../../lib/liblwan.a(lwan-request.c.o):lwan-request.c:(.text+0x1d79): more undefined references to __builtin_expect_with_probability' follow collect2: error: ld returned 1 exit status make[2]: *** [src/bin/lwan/lwan] Error 1 make[1]: *** [src/bin/lwan/CMakeFiles/lwan.dir/all] Error 2 make: *** [all] Error 2 — Reply to this email directly, view it on GitHub <#342>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AAADVGKX5PQAGRLA3ZALEY3VHNJDZANCNFSM5UUOX6AA. You are receiving this because you are subscribed to this thread.Message ID: @.***>

非常感谢您的回复，我可以使用哪个版本的GCC进行正确编译呢？

[kiwionly]

@fishfly123

You could try as below:

1. Install a package with repository for your system:
   On CentOS, install package centos-release-scl available in CentOS repository:
   $ sudo yum install centos-release-scl

2. Install this collection, it come with GCC 9
   $ sudo yum install devtoolset-9

3. Start using software collections:
   $ scl enable devtoolset-9 bash

I was able to build with steps above in centos 7.9