Mon Jul 20 16:16:38 1998 Dave Brolley <brolley@cygnus.com>

	* configure.in (enable_c_mbchar): New configure option.
	(extra_cpp_objs): Always available now.
	* cexp.y (mbchar.h): #include it.
	(yylex): Handle Multibyte characters in character literals.
	* cccp.c (mbchar.h): #include it.
	(main): Set character set based on LANG environment variable.
	(rescan): Handle multibyte characters in comments.
	(skip_if_group): See above.
	(validate_else): See above.
	(skip_to_end_of_comment): See above.
	(macarg1): See above.
	(discard_comments): See above.
	(rescan): Handle multibyte characters in string and character literals.
	(collect_expansion): See above.
	(skip_quoted_string): See above.
	(macroexpand): See above.
	(macarg1): See above.
	(discard_comments): See above.
	(change_newlines): See above.
	* c-lex.c (mbchar.h): #include it.
	(GET_ENVIRONMENT): New macro.
	(init_lex): Set character set based on LANG environment variable.
	(yylex): Handle multibyte characters in character literals.
	(yylex): Handle multibyte characters in string literals.
	* Makefile.in (mbchar.o): New target.
	(cccp$(exeext)): @extra_cpp_objs@ is always available.
	(cppmain$(exeext)): @extra_cpp_objs@ is always available.
	* mbchar.[ch]: New files for multibyte character handling.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@21303 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 25 insertions, 2 deletions

diff --git a/gcc/invoke.texi b/gcc/invoke.texi
index 8056b8478bb..3b3ad4313db 100644
--- a/gcc/invoke.texi
+++ b/gcc/invoke.texi
@@ -5964,8 +5964,9 @@ the language standard.  You should not need to use these options yourself.
 @cindex environment variables
 
 This section describes several environment variables that affect how GNU
-CC operates.  They work by specifying directories or prefixes to use
-when searching for various kinds of files.
+CC operates.  Some of them work by specifying directories or prefixes to use
+when searching for various kinds of files. Some are used to specify other
+ascpects of the compilation environment.
 
 @ifclear INTERNALS
 Note that you can also specify places to search using options such as
@@ -6065,6 +6066,28 @@ which case the Make rules are written to that file, guessing the target
 name from the source file name.  Or the value can have the form
 @samp{@var{file} @var{target}}, in which case the rules are written to
 file @var{file} using @var{target} as the target name.
+
+@item LANG
+@findex LANG
+@cindex locale definition
+This variable is used to pass locale information to the compiler. One way in
+which this information is used is to determine the character set to be used
+when character literals, string literals and comments are parsed in C and C++.
+When the compiler is configured to allow multibyte characters,
+the following values for @code{LANG} are recognized:
+
+@table @code
+@item C-JIS
+Recognize JIS characters.
+@item C-SJIS
+Recognize SJIS characters.
+@item C-EUCJP
+Recognize EUCJP characters.
+@end table
+
+If @code{LANG} is not defined, or if it has some ther value, then the
+compiler will use mblen and mbtowc as defined by the default locale to
+recognize and translate multibyte characters.
 @end table
 
 @node Running Protoize