POSIX features disappear with g++

[Alexandre Oliva]

On Oct 15, 2001, tim@timsplace.dk wrote:

> Running g++ (g++ -lrt test.c)
> 	test.c: In function `int main(int, char **)':
> 	test.c:23: implicit declaration of function `int ftruncate(...)'

Every function called in a C++ program must have been previously
declared.  It seems that you're not including the header file that
declares (!= defines) ftruncate(), or there's no header file that
declares it, in which case you'd have to figure out the appropriate
signature of the function and declare it yourself.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
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