On 1/3/06, Bob Friesenhahn <[EMAIL PROTECTED]> wrote: > On Tue, 3 Jan 2006, Steven Woody wrote: > > > on linux, simplly adding a '-pthread' option to the command line gcc, i can > > make a multi-thread c program. but if using automake, i only got many > > undefined reference to pthread_xxx errors. i've already add the '-pthread' > > to the myprogram_CFLAGS variable. > > The '-pthread' option is a non-standard compiler extension which > causes different pre-processor definitions to be applied, and > different/additional libraries to be applied. You should not assume > that other compilers/platforms work with '-pthread'. So if you insert > it into myprogram_CFLAGS then your package will only work if the > compiler supports the '-pthread' option. > > Note that CFLAGS is only applied when compiling. The LDFLAGS value is > used while linking so if you want to use '-pthread' then you should > supply it for both CFLAGS and LDFLAGS. > > The Autoconf macro archive includes a macro for determining the > correct options to use in a platform-independent way.
thanks, the LDFLAGS works. and i also interest in what the determining macro you mentioned is and how i should use it. > > Bob > ====================================== > Bob Friesenhahn > [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ > GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ > -- woody
