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POHow do I use but not expose an inline function in a c99 library?
 

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  1. POHow do I use but not expose an inline function in a c99 library?
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    <p>I'm writing a library in C99, and there are some parts of the library that would benefit significantly from the use of a macro / inline function. Inline functions are a better fit for my library.</p> <p>However, very specifically I do not want to externally expose these inline functions.</p> <p>Everything appears to work, but when I link against the library to create an executable I get the error: "undefined reference to `na_impl_gfx__draw'" </p> <p>I have reproduced the problem to a minimal test case which does exactly what I do:</p> <p>lib.h:</p> <pre><code>void somefunc(); </code></pre> <p>lib.c:</p> <pre><code>#include &lt;stdio.h&gt; #include "lib.h" inline void someinline(char *value); void somefunc() { someinline("Hi!"); } inline void someinline(char *value) { printf("%s\n", value); } </code></pre> <p>main.c:</p> <pre><code>#include "lib.h" int main(int argc, char *argv[]) { somefunc(); } </code></pre> <p>Now we compile:</p> <pre><code>doug@Wulf:~/test$ gcc -c -std=c99 lib.c doug@Wulf:~/test$ gcc -c -std=c99 main.c doug@Wulf:~/test$ gcc -std=c99 lib.o main.o lib.o: In function `somefunc': lib.c:(.text+0xe): undefined reference to `someinline' lib.c:(.text+0x1a): undefined reference to `someinline' lib.c:(.text+0x26): undefined reference to `someinline' collect2: ld returned 1 exit status </code></pre> <p>It would appear that when compiling the library, the inline function is not being substituted into the object code for the function somefunc() in lib.h</p> <p>Why?</p> <p>The inline function is not externally visible. I would expect that when the library is compiled, the inline function is inlined into the function, just like the macro is (Nb. using only a macro this code compiles file).</p> <p>What am I doing wrong? Or is this a restriction of inline functions?</p>
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