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Adding configure flag

Hi, im trying to add a configure flag to the libstdc++ for a feature
I'm testing. This flag, if enabled, would define a C macro that I'd be
using in

I was doing some research and i believe i need to edit
and acinclude.m4 on the libstdc++-v3 directory. Is this correct?

I also need to run autoconf to regenerate the libstdc++-v3 configure
script, right?

Do i need to make changes on the file in the top gcc
directory? Or can i create the flag and do the configure and make on
the libstdc++-v3 directory so it's ready for when I compile all of

On a related subject: right now, I've added the following line to the


Also, I added the following to libstdc++v3's acinclude.m4:

  GLIBCXX_ENABLE(new-opnt-if,$1,,[enable if on new_opnt instead of while])
  if test $enable_new_opnt_if = yes; then
        [Define is new_opnt will be used instead of while.])
  AC_MSG_CHECKING([for enabled if])

And on gcc top directory
    [enable if on new_opnt instead of while])],
[], [enable_new_opnt_if=yes])

As you can see, I've hardcoded this option as "yes" to test it.
However, I can't seem to make it work: in, I still can't
see the macro defined. Am I doing something wrong?

Thanks a lot!

Aurelio Remonda

Software Engineer

San Lorenzo 47, 3rd Floor, Office 5
CÃrdoba, Argentina
Phone: +54-351-4217888 / 4218211

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