"Joost Witteveen" <[EMAIL PROTECTED]> wrote in news:[EMAIL PROTECTED]:
> On 16/04/2008, John Salmon <[EMAIL PROTECTED]> wrote: >> Sven Joachim <[EMAIL PROTECTED]> wrote in >> news:[EMAIL PROTECTED]: >> >> >> > On 2008-04-15 20:39 +0200, John Salmon wrote: >> > >> >> I'm running Debian Etch on a PC. When I try to compile the >> >> following (called test.c); >> >> >> >> #include <math.h> >> >> #include <stdio.h> >> >> >> >> int main() >> >> { >> >> double >> >> val = 1.55; >> >> >> >> printf("sine: %g\n", sin(val)); >> >> >> >> return 0; >> >> } >> >> >> >> using the command line >> >> >> >> gcc -Wall -o test test.c >> >> >> >> I get >> >> >> >> /tmp/cciDV02m.o: In function `main': >> >> test.c:(.text+0x21): undefined reference to `sin' >> >> collect2: ld returned 1 exit status >> > >> > You need to link to the math library by specifying -lm _at the >> > end_ of the gcc command line, otherwise the linker does not know >> > about the sin() function. >> > >> >> When I compile the equivalent C++ program using the apropriate >> >> C++ parameters, everything goes great. Have I neglected to load a >> >> Debian package? Any help will be appreciated. >> > >> > That is to be expected, because C++ programs are automatically >> > linked against the math library. In C you have to tell the linker >> > to use it with -lm. >> > >> > Sven >> > >> > >> >> >> That solved the linking problem. Now, after a successful compilation, >> when >> I run 'test' I gen no output. ??? > > > "test" is a bash-builtin, and is a executable in /usr/bin/test, so > that is what you were running. > You can run your "test" command by typing > ./test > or rename it to something else. > > Of Cource! I'm an old dog learning new tricks. Yhanks all for understanding. -- John Salmon [EMAIL PROTECTED] ---- Posted via Pronews.com - Premium Corporate Usenet News Provider ---- http://www.pronews.com offers corporate packages that have access to 100,000+ newsgroups -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
