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POError during Cross-compiling C code with Dynamic libraries
 

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  1. POError during Cross-compiling C code with Dynamic libraries
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    <p>I've two files:</p> <p>lib.c</p> <pre><code>#include&lt;stdio.h&gt; void hi() { printf("Hi i'm a library function in lib.so\n"); } </code></pre> <p>and main.c</p> <pre><code>#include&lt;stdio.h&gt; #include&lt;dlfcn.h&gt; /* based on Jeff Scudder's code */ int main() { void *SharedObjectFile; void (*hi)(); // Load the shared libary; SharedObjectFile = dlopen("./lib.so", RTLD_LAZY); // Obtain the address of a function in the shared library. ciao = dlsym(SharedObjectFile, "hi"); // Use the dynamically loaded function. (*hi)(); dlclose(SharedObjectFile); } </code></pre> <p>And I've tried to build an executables using the following commands:</p> <blockquote> <p>export LD_LIBRARY_PATH=<code>pwd</code> </p> <p>gcc -c -fpic lib.c </p> <p>gcc -shared -lc -o lib.so lib.o </p> <p>gcc main.c -ldl</p> </blockquote> <p>And it works pretty well. Then I've tried to export my program on Android (Nexus One, with ARM-v7-0a arch) using the following commands:</p> <blockquote> <p>export LD_LIBRARY_PATH=<code>pwd</code> </p> <p>arm-none-linux-gnueabi-gcc -c -fpic lib.c </p> <p>arm-none-linux-gnueabi-gcc -shared -lc -o lib.so lib.o </p> <p>arm-none-linux-gnueabi-gcc main.c -ldl -o main</p> <p>adb push main /system/app</p> </blockquote> <p>The result of executing ./main on the correct folder on my smartphone is just:</p> <blockquote> <p>./main: not found</p> </blockquote> <p>even if my file is right there!</p> <p>Am I missing anything during the cross-compile process? Any help? I'm using the cross-compiler from CodeSourcery and it works well for static programs without .so libraries. Thanks</p> <p><em><strong>EDIT</em></strong>: as Igor states below, that was a linker issue. This command fixes it:</p> <blockquote> <p>arm-none-linux-gnueabi-gcc -o test main.c -Wl,--dynamic-linker=/system/bin/linker -ldl</p> </blockquote> <p>in my very case I need other libraries because in /system/lib/ there are no many .so files.</p>
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    1. USRob013
    1. USRob013
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    1. COAny particular reason why you're not using the NDK?
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      1. USMichael
    2. CODoes C code, once executed on android device, fail to find the .so in its folder? I knew programs should check in same folder, /usr/lib or /usr/local/lib for .so library files but I've none of the latter two on my device
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      1. USRob013
    3. COHow about adding error checks and `dlerror` calls to `main`?
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      1. POError during Cross-compiling C code with Dynamic libraries
      1. USaschepler
 

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