Thanks but if I specified '-L/usr/lib', won't it links all libraries under '/usr/lib' which includes 'boost_thread'? Thank you. On 2/4/07, John Maddock wrote:

Meryl Silverburgh wrote:

...

i have more information about my problem:

I have add '-L/usr/lib' as my library path during linking and i make sure i have 'libboost_thread*' library in '/usr/lib', but it still does not work. Any idea why?

This is a compiler issue: you need to tell the compiler that you need to link to the thread lib with a -lboost_thread.

John.

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Thanks. i still have problem in linking boost thread library. I have libboost_thread in /usr/lib: $ ls -la libboost_thread* -rwxr-xr-x 1 root root 68644 Feb 16 2006 libboost_thread.a* lrwxrwxrwx 1 root root 25 Jan 5 16:03 libboost_thread.so -> libboost_thread.so.1.33.1* -rwxr-xr-x 1 root root 43236 Feb 16 2006 libboost_thread.so.1.33.1* lrwxrwxrwx 1 root root 25 Jan 5 16:03 libboost_thread.so.2 -> libboost_thread.so.1.33.1* [meryl@localhost lib]$ pwd /usr/lib When i link it, i specified the -L and -l but I still get linker error: g++ -L/usr/lib -o"sandbox" ./thread.o -llibboost_thread /usr/bin/ld: cannot find -llibboost_thread collect2: ld returned 1 exit status make: *** [sandbox] Error 1 make: Target `all' not remade because of errors. Build complete for project sandbox Thanks for any help. On 2/4/07, James Dennett wrote:

Meryl Silverburgh wrote:

...

On 2/4/07, John Maddock wrote:

...

...

i have more information about my problem:

I have add '-L/usr/lib' as my library path during linking and i make sure i have 'libboost_thread*' library in '/usr/lib', but it still does not work. Any idea why? This is a compiler issue: you need to tell the compiler that you need to

Meryl Silverburgh wrote: link to the thread lib with a -lboost_thread.

John.

Thanks but if I specified '-L/usr/lib', won't it links all libraries under '/usr/lib' which includes 'boost_thread'?

Thank you.

No, that's not how linkers work. The notion of the search path (specified by -L) is separate from the choice of which libraries to search for. C++ does not have a fixed association from a particular header to a fixed library name (unless you use platform- specific extensions) -- you can specify the same search path, and still fulfill linkage requirements in many different ways by specifying different library names.

In summary: -L says where to look for named libraries, and -l says which named libraries to look for.

-- James

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Meryl Silverburgh wrote:

Thanks but if I specified '-L/usr/lib', won't it links all libraries under '/usr/lib' which includes 'boost_thread'?

Nope. RTFM for gcc. John.