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

Torbjorn Granlund tg at
Mon Jul 21 17:30:34 CEST 2008

Marc Glisse <marc.glisse at> writes:

  I know debian did it this way, but could you please put the #include line 
  one line higher? These standard files are not meant to be included in 
  weird situations like a namespace or a non-default linkage.
  Besides, the "using std::FILE" should now be unconditional. cstdio is 
  included in the line above so std::FILE must exist, but cstdio is included 
  after the long macro check that defines _GMP_H_HAVE_FILE so it is not 
  Maybe the include line would actually be best next to the iosfwd one at 
  the beginning of the header?
  Note: I am not discussing the ugliness of the solution, just trying to 
  make the result correct.
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>

And around line 520:

#if defined (__cplusplus)
extern "C" {
using std::FILE;


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