Hi On Wed, Jun 01, 2011 at 01:03:03AM +0000, Her, Il wrote: > Yes, it is compiled well with gcc 3.4.6, > but it doesn't work with gcc 4.1.2 Strange -- I just tried with 3.4.6 on x86_64, configured as ../gcc-3.4.6/configure --prefix=/tmp/gcc_test/install --disable-multilib Thread model: posix gcc version 3.4.6 your testcase gives (after removing the erroneous ";" in sub.cpp ) /tmp/ccGJf1zv.o: In function `main': /tmp/gcc_test/main.cpp:9: undefined reference to `Base<TEST>::dump(TEST&)' /tmp/gcc_test/main.cpp:10: undefined reference to `Base<TEST>::fn(int, int)' collect2: ld returned 1 exit status (however, I did compile without the flag "-dynamic", which is only vaild on darwin. But according to the docs, "-dynamic" is a flag for the linker - so I don't see how it would influence the template instantiation....) Axel > > > thank you > > Her, Il > Technology Consulting > Technology Service Korea > > TEL : +82-2-2199-4475 > Mobile : +82-10-4765-5597 > il.her@xxxxxx > > -----Original Message----- > From: Ian Lance Taylor [mailto:iant@xxxxxxxxxx] > Sent: Tuesday, May 31, 2011 10:51 PM > To: Her, Il > Cc: gcc-help@xxxxxxxxxxx > Subject: Re: Undefined reference to template function ... > > "Her, Il" <il.her@xxxxxx> writes: > > > Thank you for answering my question. > > Here is my sample. > > > > [Test.h] > > #ifndef __TEST_hh > > #define __TEST_hh > > struct TEST > > { > > int a, b; > > }; > > #endif > > > > [sub.h] > > #include <stdio.h> > > template <typename T> struct Base > > { > > void dump(T &r); > > int fn(int a, int b); > > }; > > > > [sub.cpp] > > #include "sub.h" > > > > template<typename T> void Base<T>::dump(T &r) > > { > > } > > > > template<typename T> int Base<T>::fn(int a, int b); > > { > > return 0; > > } > > > > [main.cpp] > > #include <stdio.h> > > #include "sub.h" > > #include "TEST.h" > > > > int main() > > { > > Base<TEST> t; > > TEST x; > > > > t.dump(x); > > t.fn(1, 2); > > } > > > > ** Result of compiling > > [test@test-1] $ g++ -c -dynamic sub.cpp > > [test@test-1] $ g++ -shared -o libsub.so sub.o > > [test@test-1] $ g++ -g -W -o main main.cpp -lsub -L./ > > /tmp/ccaUlqlQ.o: In function `main`: > > /home/guinsa/main.cpp:10: undefined reference to `Base<TEST>::dump(TEST&)` > > /home/guinsa/main.cpp:11: undefined reference to `Base<TEST>::fn(int, int)` > > collect2: ld returned 1 exit status > > > In your earlier message you said that you had code that worked with gcc > 3.4.6 but failed with gcc 4.1.2. Does this test case work with gcc > 3.4.6? > > Ian
