osx - Beginner's question, trying to understand how the linker searches for a static library -


I have a work setup, where all the files are in the same directory (desktop) is the terminal output such as: 

  $ gcc -c mymath.c $ ar r mymath.a mymath.o ar: create archive mymath.a $ ranlib mymath.a $ gcc test.c Mymath.a -o trial $ ./test Hello World! 3.14 1.77 10.20

Files:

mymath.c: 

  float mysqrt (float n) {return 10.2; }

test.c: 

  #include & lt; Math.h> # Include & lt; Stdio.h & gt; #include "mymath.h" Main () {printf ("Hello World! \ N"); Float x = sqrt (M_PI); Printf ("% 3.2f \ n", M_PI); Printf ("% 3.2f \ n", sqrt (M_PI)); Printf ("% 3.2f \ n", mysqrt (M_PI)); Return 0; }

Now, I move the archive mymath.a to a subdirectory / temp. I am not able to get the link to work: 

  $ gcc test.c mymath.a -o test -l / users / telliott_admin / desktop / temp / mymath.a i686- Apple-darwin10-gcc-4.2.1: mymath.a: Library for no file or directory $ gcc test.c -o test -i / users / telliott_admin / desktop / temp -lmymath ld: -lmymath collect2 Could not find: Ld 1 exit status returned

What am I missing? Which resource would you recommend?

Update: Thanks for your help, all answers were basically correct. I have blogged about it.

To include math libraries, use -lm, not -lame, besides you To add a link to the link, use the sub-directory along with the sub-directory (-I just include the header for the compilation).

You can compile and link: 

  GCC test.c -o test -i / users / telliott_admin / desktop / temp / user / teleteot_admin / desktop / temp / Mymath.a

or 

  gcc test.c -o test -i / users / telliott_admin / desktop / temp -l / user / telliott_admin / Desktop / temp -lmymath

where mymath.a has been renamed Libmymath.a.

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