libidn malloca compile fails GNULIBHEADERS_OVERRIDE_WINT_T not set

[Brian Inglis]

Under Cygwin 64 and 32, libidn malloca compile fails because gl/stdint.h
is generated (for some reason, possibly because gnulib is yet to be or 
may not be ported to Cygwin, as Cygwin uses newlib rather than glibc, 
and is not Linux) with no value set for GNULIBHEADERS_OVERRIDE_WINT_T in 
#if, as no tests are configured to set the value under Cygwin: please 
see attached log for details.

--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]
Under Cygwin 64 and 32, malloca compile fails because gl/stdint.h
is generated (for some reason) with no value set for 
GNULIBHEADERS_OVERRIDE_WINT_T in #if, as no tests are configured
to set the value:

compile.log:
...
  CC       malloca.lo
In file included from 
/.../src/cygwin/libidn/libidn-1.37-1.x86_64/src/libidn-1.37/gl/malloca.h:24,
                 from 
/.../src/cygwin/libidn/libidn-1.37-1.x86_64/src/libidn-1.37/gl/malloca.c:22:
./stdint.h:89:5: error: #if with no expression
   89 | #if
      |     ^
make[4]: *** [Makefile:1560: malloca.lo] Error 1
make[4]: Leaving directory 
'/.../src/cygwin/libidn/libidn-1.37-1.x86_64/build/gl'
make[3]: *** [Makefile:1579: all-recursive] Error 1
make[3]: Leaving directory 
'/.../src/cygwin/libidn/libidn-1.37-1.x86_64/build/gl'
make[2]: *** [Makefile:1455: all] Error 2
make[2]: Leaving directory 
'/.../src/cygwin/libidn/libidn-1.37-1.x86_64/build/gl'
make[1]: *** [Makefile:1417: all-recursive] Error 1
make[1]: Leaving directory '/.../src/cygwin/libidn/libidn-1.37-1.x86_64/build'
make: *** [Makefile:1343: all] Error 2
*** ERROR: make failed


build/gl/stdint.h:
...
/* Override WINT_MIN and WINT_MAX if gnulib's <wchar.h> or <wctype.h> overrides
   wint_t.  */
#if 
# undef WINT_MIN
# undef WINT_MAX
# define WINT_MIN 0x0U
# define WINT_MAX 0xffffffffU
#endif
...


src/libidn-1.37/gl/stdint.in.h:
...
/* Override WINT_MIN and WINT_MAX if gnulib's <wchar.h> or <wctype.h> overrides
   wint_t.  */
#if @GNULIBHEADERS_OVERRIDE_WINT_T@
# undef WINT_MIN
# undef WINT_MAX
# define WINT_MIN 0x0U
# define WINT_MAX 0xffffffffU
#endif
...


build/gl/Makefile:
...
# We need the following in order to create <stdint.h> when the system
# doesn't have one that works with the given compiler.
stdint.h: stdint.in.h $(top_builddir)/config.status
        $(AM_V_GEN)rm -f $@-t $@ && \
        { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
          sed -e 's|@''GUARD_PREFIX''@|GL_LGL|g' \
              -e 's/@''HAVE_STDINT_H''@/$(HAVE_STDINT_H)/g' \
              -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|#pragma GCC system_header|g' \
              -e 's|@''PRAGMA_COLUMNS''@||g' \
              -e 's|@''NEXT_STDINT_H''@|$(NEXT_STDINT_H)|g' \
              -e 's/@''HAVE_C99_STDINT_H''@/$(HAVE_C99_STDINT_H)/g' \
              -e 's/@''HAVE_SYS_TYPES_H''@/$(HAVE_SYS_TYPES_H)/g' \
              -e 's/@''HAVE_INTTYPES_H''@/$(HAVE_INTTYPES_H)/g' \
              -e 's/@''HAVE_SYS_INTTYPES_H''@/$(HAVE_SYS_INTTYPES_H)/g' \
              -e 's/@''HAVE_SYS_BITYPES_H''@/$(HAVE_SYS_BITYPES_H)/g' \
              -e 's/@''HAVE_WCHAR_H''@/$(HAVE_WCHAR_H)/g' \
              -e 's/@''APPLE_UNIVERSAL_BUILD''@/$(APPLE_UNIVERSAL_BUILD)/g' \
              -e 's/@''BITSIZEOF_PTRDIFF_T''@/$(BITSIZEOF_PTRDIFF_T)/g' \
              -e 's/@''PTRDIFF_T_SUFFIX''@/$(PTRDIFF_T_SUFFIX)/g' \
              -e 's/@''BITSIZEOF_SIG_ATOMIC_T''@/$(BITSIZEOF_SIG_ATOMIC_T)/g' \
              -e 
's/@''HAVE_SIGNED_SIG_ATOMIC_T''@/$(HAVE_SIGNED_SIG_ATOMIC_T)/g' \
              -e 's/@''SIG_ATOMIC_T_SUFFIX''@/$(SIG_ATOMIC_T_SUFFIX)/g' \
              -e 's/@''BITSIZEOF_SIZE_T''@/$(BITSIZEOF_SIZE_T)/g' \
              -e 's/@''SIZE_T_SUFFIX''@/$(SIZE_T_SUFFIX)/g' \
              -e 's/@''BITSIZEOF_WCHAR_T''@/$(BITSIZEOF_WCHAR_T)/g' \
              -e 's/@''HAVE_SIGNED_WCHAR_T''@/$(HAVE_SIGNED_WCHAR_T)/g' \
              -e 's/@''WCHAR_T_SUFFIX''@/$(WCHAR_T_SUFFIX)/g' \
              -e 's/@''BITSIZEOF_WINT_T''@/$(BITSIZEOF_WINT_T)/g' \
              -e 's/@''HAVE_SIGNED_WINT_T''@/$(HAVE_SIGNED_WINT_T)/g' \
              -e 's/@''WINT_T_SUFFIX''@/$(WINT_T_SUFFIX)/g' \
              -e 
's/@''GNULIBHEADERS_OVERRIDE_WINT_T''@/$(GNULIBHEADERS_OVERRIDE_WINT_T)/g' \
              < $(srcdir)/stdint.in.h; \
        } > $@-t && \
        mv $@-t $@
#stdint.h: $(top_builddir)/config.status
#       rm -f $@
...