Re: Building Perl on Cygwin

[Nigel Horne]

On 17/04/2014 12:01, Reini Urban wrote:

On 04/17/2014 10:22 AM, Nigel Horne wrote:

To date I have been able to build Perl on Cygwin with no problems but on
a new machine I have had problems.  Any version that I try to build
gives error when trying to compile cygwin.c:

nostdio.h:25:14: error: two or more data types in declaration specifiers
  #define FILE struct _FILE

Any ideas?

yes, see 6cc44f6270d743bed3e552da82c044f377e1c777

avoid a "FILE" name conflict with cygwin's wchar.h

The 1.7.28 release of cygwin (or possible a separate package released
around the same time) header wchar.h includes the following code:

      typedef __FILE FILE;

With PERLIO_NOT_STDIO set to true, the default for core source files, we
    #include nostdio.h which does:

      struct _FILE;
      #define FILE struct _FILE

which turns the above code into:

      typedef __FILE struct _FILE;

which isn't C.

Disable this hack for cygwin.c

--- cygwin/cygwin.c
+++ cygwin/cygwin.c
@@ -2,6 +2,7 @@
  * Cygwin extras
  */

+#define PERLIO_NOT_STDIO 0
 #include "EXTERN.h"
 #include "perl.h"
 #undef USE_DYNAMIC_LOADING

Thanks. I think that answers my question, I'll give it a go later this evening, though that won't help the scenario when doing 'perlbrew install'.

Regards,

-Nigel

Is this a bug in Cygwin? It's bad that it breaks something as fundamental as Perl.

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