> This fixes the bootstrap failure with Ada on Cygwin since the switch > to C++11. The configure checks detect that fileno_unlocked () is > present, but when Ada's cstreams.c is compiled in C++11 mode, > <stdio.h> does not declare it, causing a hard error. > > Fixed by defining _GNU_SOURCE before including <stdio.h>. > > Ok for the master branch? > > gcc/ada/ > > 2021-02-03 Mikael Pettersson <mikpeli...@gmail.com> > > PR bootstrap/98590 > * cstreams.c: Ensure fileno_unlocked() is visible on Cygwin.
We'd rather not have PR references in the source files, so please remove it (it will be there as part of the commit log and git annotate). OK with the comment updated. > diff --git a/gcc/ada/cstreams.c b/gcc/ada/cstreams.c > index 4e00dedbbd6..9d2f41c5269 100644 > --- a/gcc/ada/cstreams.c > +++ b/gcc/ada/cstreams.c > @@ -37,6 +37,11 @@ > #define _FILE_OFFSET_BITS 64 > /* the define above will make off_t a 64bit type on GNU/Linux */ > > +/* tell Cygwin's <stdio.h> to expose fileno_unlocked() to work around > PR98590 */ > +#if defined(__CYGWIN__) && !defined(__CYGWIN32__) && !defined(_GNU_SOURCE) > +#define _GNU_SOURCE > +#endif > + > #include <stdio.h> > #include <sys/types.h> > #include <sys/stat.h>
