Compiling a C program with g++ 4.3.1 yields an error about std::FILE

Marc Glisse marc.glisse at
Mon Aug 11 15:57:56 CEST 2008

On Mon, 21 Jul 2008, Torbjorn Granlund wrote:

> So, this is what you're suggesting:
> At the beginning of the file:
> #if defined (__cplusplus)
> #include <iosfwd>   /* for std::istream, std::ostream, std::string */
> #include <cstdio>
> #endif
> And around line 520:
> #if defined (__cplusplus)
> extern "C" {
> using std::FILE;
> #endif

Apparently this was forgotten for 4.2.3.

In 4.2.3, in C++, gmp.h always includes cstdio, but only declares the 
gmp_fprintf and co functions if stdio.h or cstdio was included before 
gmp.h, because the _GMP_H_HAVE_FILE macro doesn't get set otherwise. By 
the way, with glibc and g++, part of stdio.h already gets included 
indirectly by iosfwd, but it only defines __FILE_defined, which is not 
tested by _GMP_H_HAVE_FILE (don't know if it should be).

I also noticed that if I use the Sun compiler on linux-x86 (the compiler 
is common for x86 and x86_64), configure choses ABI=64, which obviously 
fails. Well I just set ABI=32 and there is no problem.

Marc Glisse

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