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POlinker tells me it can't resolve symbols, but they're there?
 

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    <p>I am trying to compile a simple test app using a library I've written. This compiles and runs fine on other machines.</p> <p>I have libroller.so available at /usr/lib. I'm compiling a main.cpp as such:</p> <pre><code>g++ -g3 -Wall -I"../../" -lrt -lroller -o rap main.o </code></pre> <p>It complains of numerous errors such as:</p> <pre><code>/....../main.cpp:51: undefined reference to `Log::i(char const*, ...)' </code></pre> <p>However, I know that these exist in this so:</p> <pre><code>nm -Ca /usr/lib/libroller.so | grep "Log::i" 00000000001f5d50 T Log::i(char const*, ...) 0000000000149530 W Log::i(std::string const&amp;) </code></pre> <p>Both are 64 bit:</p> <pre><code>file /usr/lib/libroller.so /usr/lib/libroller.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped file main.o main.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV), not stripped </code></pre> <p>Unlike <a href="https://stackoverflow.com/questions/216450/gcc-and-ld-cant-find-exported-symbols-but-theyre-there">GCC and ld can&#39;t find exported symbols...but they&#39;re there!</a> I'm pretty sure these symbols are defined. The same .so works with another using some of the same symbols.</p> <p>EDIT/ANSWER: The order of objects is important. Placing main.o before the libraries was necessary. I'm guessing the linker had no unresolved symbols to deal with until it got to main.o -- which was the last object in its list. I'm still a little confused as to why this worked on other machines for many months...</p>
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    1. COYour question is a dup of [this one][1], and has the same answer. [1]: http://stackoverflow.com/questions/8380087/boost-1-48-linking-issue-with-gcc-4-6-1
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    2. COThanks. I did search, I promise :) Searching for "unresolved" and "gcc" turn up LOTS of irrelevant answers...
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