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I have the following program: ~/test> cat test.cc int main() { int i = 3; int j = __sync_add_and_fetch(&i, 1); return 0; } I'm compiling this program using GCC 4.2.2 on Linux running on a multi-cpu 64-bit Intel machine: ~/test> uname --all Linux doom 2.6.9-67.ELsmp #1 SMP Wed Nov 7 13:56:44 EST 2007 x86_64 x86_64 x86_64 GNU/Linux When I compile the program in 64-bit mode, it compiles and links fine: ~/test> /share/tools/gcc-4.2.2/bin/g++ test.cc ~/test> When I compile it in 32-bit mode, I get the following error: ~/test> /share/tools/gcc-4.2.2/bin/g++ -m32 test.cc /tmp/ccEVHGkB.o(.text+0x27): In function `main': : undefined reference to `__sync_add_and_fetch_4' collect2: ld returned 1 exit status ~/test> Although I will never actually run on a 32-bit processor, I do need a 32-bit executable so I can link with some 32-bit libraries. My 2 questions are: Why do I get a link error when I compile in 32-bit mode? Is there some way to get the program to compile and link, while still being able to link with a 32-bit library?

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