gcc: add Apple compatible -Wnewline-eof

GCC 4.2 and previous have always warned about
"No newline at end of file".

Upstream GCC removed the warning completely but
Apple made it an optional warning. Adopt it for
compatibility with older GCC and clang.

While here, add comment to complement r258712.

Obtained from:	Apple Inc. (Apple GCC 4.2 - 5531)
MFC after:	1 week

3 files changed, 20 insertions, 0 deletions

diff --git a/contrib/gcc/c-opts.c b/contrib/gcc/c-opts.c
index ed6b771..6b29068 100644
--- a/contrib/gcc/c-opts.c
+++ b/contrib/gcc/c-opts.c
@@ -487,6 +487,12 @@ c_common_handle_option (size_t scode, const char *arg, int value)
       cpp_opts->warn_multichar = value;
       break;
 
+      /* APPLE LOCAL begin -Wnewline-eof */
+    case OPT_Wnewline_eof:
+      cpp_opts->warn_newline_at_eof = value;
+      break;
+      /* APPLE LOCAL end -Wnewline-eof */
+
     case OPT_Wnormalized_:
       if (!value || (arg && strcasecmp (arg, "none") == 0))
 	cpp_opts->warn_normalize = normalized_none;
diff --git a/contrib/gcc/c.opt b/contrib/gcc/c.opt
index 86e9460..58d13e8 100644
--- a/contrib/gcc/c.opt
+++ b/contrib/gcc/c.opt
@@ -292,6 +292,12 @@ Wnested-externs
 C ObjC Var(warn_nested_externs)
 Warn about \"extern\" declarations not at file scope
 
+; APPLE LOCAL begin -Wnewline-eof
+Wnewline-eof
+C ObjC C++ ObjC++
+Warn about files missing a newline at the end of the file
+; APPLE LOCAL end -Wnewline-eof
+
 Wnon-template-friend
 C++ ObjC++ Var(warn_nontemplate_friend) Init(1)
 Warn when non-templatized friend functions are declared within a template
diff --git a/contrib/gcc/doc/invoke.texi b/contrib/gcc/doc/invoke.texi
index 5263e91..ed42d6f 100644
--- a/contrib/gcc/doc/invoke.texi
+++ b/contrib/gcc/doc/invoke.texi
@@ -169,6 +169,8 @@ in the following sections.
 -trigraphs  -no-integrated-cpp  -traditional  -traditional-cpp @gol
 -fallow-single-precision  -fcond-mismatch -flax-vector-conversions @gol
 -fsigned-bitfields  -fsigned-char @gol
+@c APPLE LOCAL -Wnewline-eof 2001-08-23 --sts **
+-Wnewline-eof (Apple compatible) @gol
 -funsigned-bitfields  -funsigned-char}
 
 @item C++ Language Options
@@ -2082,6 +2084,12 @@ Inhibit all warning messages.
 @opindex Wno-import
 Inhibit warning messages about the use of @samp{#import}.
 
+@c APPLE LOCAL begin -Wnewline-eof 2001-08-23 --sts **
+@item -Wnewline-eof
+@opindex Wnewline-eof
+Warn about files missing a newline at the end of the file.  (FreeBSD ONLY)
+@c APPLE LOCAL end -Wnewline-eof 2001-08-23 --sts **
+
 @item -Wchar-subscripts
 @opindex Wchar-subscripts
 Warn if an array subscript has type @code{char}.  This is a common cause