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POC - Undefined symbols for architecture x86_64 when compiling on Mac OSX Lion
 

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  1. POC - Undefined symbols for architecture x86_64 when compiling on Mac OSX Lion
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    <p>I'm getting some problems on compiling a very very simple name.c file on Mac OSX Lion.</p> <p>Now, I started following Harvard CS50 course on cs50.net. I'm not totally new to programming but I was curious on how this course has been taught. </p> <p>This is the source of name.c:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;cs50.h&gt; int main(void) { printf("State your name:\n"); string name = GetString(); printf("O hai, %s!\n", name); return 0; } </code></pre> <p>As you can see, it requires this library: <a href="https://manual.cs50.net/CS50_Library" rel="nofollow noreferrer">https://manual.cs50.net/CS50_Library</a>.</p> <p>Now, when I compile it, this happens:</p> <pre><code>Undefined symbols for architecture x86_64: "_GetString", referenced from: _main in name-vAxcar.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [name] Error 1 </code></pre> <p>If I use the same GetString() cs50.c function inside my source file, it works perfectly:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;string.h&gt; #include &lt;float.h&gt; #include &lt;limits.h&gt; #include &lt;stdbool.h&gt; #include &lt;stdlib.h&gt; typedef char *string; string GetString(void); int main(void) { printf("State your name:\n"); string name = GetString(); printf("O hai, %s!\n", name); } string GetString(void) { // CODE } </code></pre> <p>Why does this happen? I installed the library as it says on the link above; I checked and both cs50.h and libcs50.a are respectively in /usr/local/include and /usr/local/lib.</p> <p>Thank you in advance for your help.</p>
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    1. USJonathan Leffler
    1. USPillo
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    1. COAre you passing `-lcs50` to your compiler?
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      1. POC - Undefined symbols for architecture x86_64 when compiling on Mac OSX Lion
      1. USapmasell
    2. COAnd also an appropriate `-L<some_directory>` to tell the compiler where to search for `-lcs50`?
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      1. POC - Undefined symbols for architecture x86_64 when compiling on Mac OSX Lion
      1. UStwalberg
 

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