Fedora动态替代libm.a(静态lib)吗? [英] Fedora dynamic replacement for libm.a(static lib)?

问题描述

我只是想弄清楚，为什么 Fedora 没有静态库libm.a，如果事实是我应该使用的 ? 如 StackOverflow 中此处所述. strong>我可以简单地从yum安装 pkg ，但是可以认为 Fedora 可以替代默认的 lib . ?

I'm just trying to figure it out, why Fedora has not the static library libm.a, and if it is a fact, which i should use? As mentioned here in StackOverflow i can simply install the pkg from yum, but is acceptable to think that Fedora have a replacement as default lib instead.No?

已编辑

我正在尝试编译它:

#include <stdio.h>
#include <stdlib.h>

void fred(int arg)
{
    printf("fred: you passed %d\n", arg);
}

输出是这样的:

$ gcc -o fred fred.c /usr/lib64/libm.so
/usr/lib/gcc/x86_64-redhat-linux/6.2.1/../../../../lib64/crt1.o: En la función `_start':
(.text+0x20): referencia a `main' sin definir
collect2: error: ld devolvió el estado de salida 1

使用lm和/usr/lib/libm.a和/usr/lib64/libm.a

我已经完成了所有在这里和其他帖子中提及的内容，yum install glibc-static，并检查了/usr/lib64/libm.so

I've done all mencioned here and other posts, yum install glibc-static and checked for /usr/lib64/libm.so

编辑

repoquery --whatprovides /usr/lib64/libm.a:

failure: repodata/repomd.xml from fedora-cisco-openh264: [Errno 256] No more mirrors to try.
https://codecs.fedoraproject.org/openh264/24/x86_64/repodata/repomd.xml: [Errno -1] repomd.xml signature could not be verified for fedora-cisco-openh264

谢谢.

推荐答案

这里有几件事....

1. 在您的小示例中，您无需使用任何数学函数，因此您实际上并不需要libm

1. You don't use any math functions in your little example, so you don't really need libm

如果您 did 需要libm，则实际上并不需要 static libm.a.您可以链接到动态链接，可以使用gcc -lm进行链接，而不是直接指定文件名.

If you did need libm, you don't really need the static libm.a. You can link against the dynamic one, and you can do this with gcc -lm rather than giving the file name directly.

如果出于某些原因 did 需要libm.a，则可以在glibc-static软件包中找到它-但出于很多原因，不建议这样做.

If you did need libm.a for some reason, you could find it in the glibc-static package — but for a whole host of reasons this is not recommended.

如错误消息所述，真正的错误是您缺少main()函数.尝试将其添加到文件底部:

As the error message says, what's really wrong is that you're missing a main() function. Try adding this to the bottom of your file:

int main(int argc，char ** argv) { fred(1); fred(2); fred(42); }

int main (int argc, char **argv) { fred(1); fred(2); fred(42); }

然后使用gcc -o fred fred.c

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