Solved gcc on .cpp file gives undefined reference to `operator new[]

[Bill Evans at Mariposa]

I'm trying to port something to FreeBSD, and the original source bundle uses gcc, and (among other things) compiles a few .cpp files.

When I installed FreeBSD's gcc package, I noticed this text:

---------- Message for gcc-4.8.4_3:

To ensure binaries built with this toolchain find appropriate versions
of the necessary run-time libraries, you may want to link using
  -Wl,-rpath=/usr/local/lib/gcc48

But before using that on the software I'm porting, as a test I tried compiling this file 1.cpp:

int main(void)
{
  int *something;
  something=new int[8];
  return 0;
}

... using this command:

gcc -Wl,-rpath=/usr/local/lib/gcc48 1.cpp -o 1

Directory /usr/local/lib/gcc48 has tons of files in it, incidentally, leading me to think that I had probably installed gcc correctly. But the compilation attempt generated this message:

/tmp//ccBrMZU7.o: In function 'main':
1.cpp:(.text+0x11): undefined reference to `operator new[](unsigned int)'
collect2: error: ld returned 1 exit status

I'm sure it's something really simple. What am I doing wrong?

 

[xavi]

I'm sure it's something really simple. What am I doing wrong?

It seems that you are using gcc as a linker wrapper instead of g++. So the standard C++ runtime is not linked in, and operator new can't be found. You have to either use g++ to link, or specify the C++ runtime yourself, which is usually -lstdc++.

 

[Bill Evans at Mariposa]

Incredibly, when I installed gcc48, it provided nothing called g++. On the theory that perhaps gcc tests argv[0] for something, I tried creating a symbolic link at /usr/local/bin/g++ to /usr/local/bin/gcc, and used g++. This did not fix the problem. Introducing command line option -lstdcc++, however, did.

 

[tobik@]

lang/gcc does not even install gcc for me. It does however install /usr/local/bin/gcc48 and /usr/local/bin/g++48.

 

[kpa]

Yes that's according to the policy of not installing binaries with same names there could be in the base system, FreeBSD 8 and 9 still have /usr/bin/gcc|g++|etc.