Cannot find -lc and -lm in g++ linux

I am using Ubuntu and gcc and g++ were working fine but today it showed:

cannot find -lm
cannot find -lc

I searched and found it has something to do with /usr/bin/ld. Which is a symlink (I hope) to lbd.bdf. I pasted that file in the directory from Ubuntu of some friends PC. It didn't work.

I found that -lc means include static library libc.a.

similarly for -lm

I found the开发者_如何学Pythonm in my i386-linux-folders (name was something different).

I tried code blocks but same errors.

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The compiler cannot find static glibc, you might have installed only the shared libraries, try:

yum install glibc-static

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make sure that your libpath (in g++) points to the directory(ies) that libm.a and libc.a are located in (use the -L option)

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ld is the GNU linker.

man ld ld combines a number of object and archive files, relocates their data and ties up symbol references. Usually the last step in compiling a program is to run ld.

It is uses to link your program with the C library and the C math library. You need to make sure that libc6-dev is installed:

foo@bar: $ dpkg -s libc6-dev

Or more generic, ensure build-essential, which depends on a handful of essential C packages.

foo@bar: $ dpkg -s build-essential