Re: [PATCH 1/2] Prevent zconf.gperf from throwing an error on OSX

["Jason T. Masker" <jason@masker.net>]

Updated zconf.gperf patch to be conditional.

The problem is when compiling with clang/LLVM, so not necessarily
specific to OS X. Offsetof is part of C99 and defined in stddef.h, but
is builtin with gcc. This code will check for a definition and try
including stddef.h if it is not found. As a last resort, offsetof will
be defined.


diff --git a/kconfig/zconf.gperf b/kconfig/zconf.gperf
index c9e690e..d758a2a 100644
--- a/kconfig/zconf.gperf
+++ b/kconfig/zconf.gperf
@@ -7,6 +7,15 @@
 %pic
 %struct-type

+%{
+# ifndef offsetof
+#  include <stddef.h>
+#  ifndef offsetof
+#   define offsetof(st, m) ((size_t)(&((st *)0)->m))
+#  endif
+# endif
+%}
+
 struct kconf_id;

 static struct kconf_id *kconf_id_lookup(register const char *str,
register unsigned int len);

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