编译出错，cannot find -lm

lrz

最初由 doubleelec 发表
不明白为啥你的链接命令中并没有 -lm
不知是不是在写在了后面的某个 .o 文件中
如果这样,链接命令中指定了 -static 选项,要求静态链接链接
就必须有 /usr/lib/libm.a 了(.a是静态库, .so是动态库)

你的问题的确比较怪,只能慢慢试了

:!! , I really need this to be solved
i used the same with Redhat before, and everything is ok

in this case, can I delete the -static flag in the Makefile?
or , is there any possibility for me to downlaod the libm.a?

:thank

lrz

最初由 kj501 发表
libm.so是共享库，libm.a是静态库。
用ls -l 看看libm.so@是链接到那个文件的？

ls -l /usr/lib/libm.so
lrwxrwxrwx 1 root root 19 Jul 27 21:34 /usr/lib/libm.so -> ../../lib/libm.so.6*

kj501

如果动态库没有问题，那就一定是静态库的问题了。一般的linux发行版不会自动安装静态库的，你把gcc和glibc的static库安装上，应该可以解决问题了。

doubleelec

那就去掉试试吧,
不过找到 libm.a 更好一些

libm.a 属于 glibc-devel-2.3.2-11.9.rpm (我的系统是Redhat 9.0)
如果你的系统类似
从网上或安装盘上找到合适版本的glibc-devel库然后安装

lrz

how can i know it is static or not?
when i tried to search libc and gcc from the installing packages
too many! shall I install them all?

doubleelec

可以完全安装,但要注意和你系统原来的
同名库版本接近, 尤其不能比原来的低

lrz

thank you very much everyone, especially kj501 and doubleelee :thank :thank

mine is Mandrake, i have installed the glibc-devel..., seems that everything is ok, the executable file comes out, but I cannot run it, nothing happened why i tired to execute it, i decided to compile it again.

anyway, thank you!

kj501

问题解决啦，头像也换啦！

lrz

最初由 kj501 发表
问题解决啦，头像也换啦！

en, it took me almost one week to sort out the problem, change systems etc etc, well, haven completlely finished yet, but I think the reason should be the package itself, but not the system, so just took a littlle break, playing around.

but I did learn a lot during this process and I really enjoyed it.

hope I myself can helpful to other people in the future.

thank you again!