Date: Sun, 13 Nov 2005 19:43:42 -0800 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Marc Argent <margent@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: FreeBSD 6.0 and Objective C Message-ID: <20051114034342.GB6650@flame.pc> In-Reply-To: <4d6854f30511131644p52847154o@mail.gmail.com> References: <4d6854f30511131644p52847154o@mail.gmail.com>
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On 2005-11-14 00:44, Marc Argent <margent@gmail.com> wrote: > Hi, > > I am trying to compile a very simple Objective C program (actually, it > is a 'Hello World' test program with a different file extension and > linked to the Objective C library). > > #import <stdio.h> > > int main (int argc, const char *argv[]) > { > printf("Hello World\n"); > return 0; > } > > I am invoking the compiler with the following line: > > gcc main.m -o helloworld -l objc > > This results in the following error message: > > /usr/lib/libobjc.so: undefined reference to `pthread_attr_destroy' > /usr/lib/libobjc.so: undefined reference to `pthread_create' > /usr/lib/libobjc.so: undefined reference to `pthread_attr_init' > /usr/lib/libobjc.so: undefined reference to `pthread_exit' > /usr/lib/libobjc.so: undefined reference to `pthread_getschedparam' > /usr/lib/libobjc.so: undefined reference to `pthread_setschedparam' > /usr/lib/libobjc.so: undefined reference to `pthread_attr_setdetachstate' First of all, remove the space after -l. Then add -lpthread to the libraries you link to and see if that helps.
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