[Bug 305460]

[Eyalroz1]

(In reply to Jonathan Wakely from comment #20)
> No, but "the first non-pure, non-inline virtual function in the class" is
> easy for the user to find.

Well, yes, granted, that would be a huge improvement. But then, is
binutils allowed to make that assumption about the ABI?  ... actually,
never mind. Even if it isn't, they could still write something like "The
probable cause is a lack of definition of the first virtual method in
the class which isn't inline nor pure-virtual".

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https://bugs.launchpad.net/bugs/305460

Title:
  [PR42540] c++ error message [vtable undefined] is unhelpful

Status in gcc:
  In Progress
Status in gcc-defaults package in Ubuntu:
  Confirmed

Bug description:
  I've had response to g++ crash reports, so maybe you'd also like to
  know about this confusing error message I found.

  Thanks!
  Alan

  This is on an up-to-date install of "Ubuntu 8.04.1".

  apt-cache policy gcc
  gcc:
    Installed: 4:4.2.3-1ubuntu6
    Candidate: 4:4.2.3-1ubuntu6
    Version table:
   *** 4:4.2.3-1ubuntu6 0
          500 http://gb.archive.ubuntu.com hardy-updates/main Packages
          100 /var/lib/dpkg/status
       4:4.2.3-1ubuntu3 0
          500 http://gb.archive.ubuntu.com hardy/main Packages


  Minimal test program:

  class A {
      A();

      virtual void B();
  };

  A::A() {}
  /* Whoops, I forgot to define A::B() */

  Actual error message:

  /usr/lib/gcc/x86_64-linux-gnu/4.2.4/../../../../lib/crt1.o: In function `_start':
  (.text+0x20): undefined reference to `main'
  /tmp/cc8P2uDq.o: In function `A::A()':
  test.cpp:(.text+0x9): undefined reference to `vtable for A'
  /tmp/cc8P2uDq.o: In function `A::A()':
  test.cpp:(.text+0x1f): undefined reference to `vtable for A'
  collect2: ld returned 1 exit status

  Expected error message:

  Something more like "undefined reference to A::B()"

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