Re: undeclared identifier

[Alexandre Oliva <aoliva at redhat dot com>]

On Apr 17, 2001, Everard Kamphorst <everard@flatearthscience.com> wrote:

> When using the GCC 3.0 C++ compiler I get an error when compiling
> the following test program:

> test.cpp:5: `alloca' undeclared (first use this function)

Yep.  That's correct.  C++ doesn't permit one to call a function that
hasn't been declared.  GCC 3.0 is beginning to enforce that rule.  As
a temporary work-around, use -fpermissive to disable it.  As a
long-term fix, get the bug fixed, i.e., make sure you've got a
declaration of alloca before calling it.

In the particular case of alloca, you may replace it with
__builtin_alloca, if you know you'll be compiling your code with GCC.

-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
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