GCC 4.2.0: optimisation appears to break C++ compile/link

[Lionel B <lionelbuk@xxxxxxxxxxx>]

Greetings,

I installed GCC 4.2.0 on linux x86_64, configured as follows:

# cd <objdir>
# <srcdir>/configure --prefix=<instdir> --enable-languages=c,c++,fortran 
--enable-version-specific-runtime-libs --with-build-time-
tools=<binutilsdir> --with-as=<binutilsdir>/as --with-ld=<binutilsdir>/ld

where:

<objdir>      is the build directory
<srcdir>      contains GCC 4.2.0 sources,
<instdir>     contains the new GCC installation
<binutilsdir> contains binutils binaries (ver 2.17, compiled with system 
gcc 3.4.6)

None of <objdir>, <srcdir>, instdir>, <binutilsdir> is a subdir of 
another.

make and make install proceeded without any apparent problems.

I have tested the installation on a C++ "Hello world"

// hello.cpp:

#include <iostream>

int main()
{
	std::cout << "hello world\n";
	return 0;
}

Compiling as:

# <instdir>/g++ hello.cpp -o hello

<binutilsdir>/ld: cannot find -lgcc_s
collect2: ld returned 1 exit status

This is fixable by specifying -static-libgcc (or by -L<instdir>/lib/gcc/
x86_64-unknown-linux-gnu/lib64) and the program runs correctly.

(BTW - why should this be necessary? Does it indicate a problem?)

However, if I try to optimise, eg.

# <instdir>/g++ hello.cpp -O -static-libgcc -o hello

the program compiles and links ok, but running it gives:

# ./hello
./hello: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.9' not found 
(required by ./hello)

The same happens at higher optimisation levels. The problem does not 
appear to affect C (as opposed to C++) code; eg.

/* hello.c */

#include <stdio.h>

int main()
{
	printf("hello world\n");
	return 0;
}

# <instdir>/gcc hello.c -O -static-libgcc -o hello

yields a correctly functioning program.

I have installed GCC 4.1.2 in exactly the same way and don't see this 
problem.

Anyone seen this before?

Regards,

-- 
Lionel B