c/352: Digraphs should not be enabled with -std=iso9899:1990

[Joseph Myers]

>Number:         352
>Category:       c
>Synopsis:       Digraphs should not be enabled with -std=iso9899:1990
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Tue Jun 27 05:56:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Joseph S. Myers
>Release:        2.96
>Organization:
none
>Environment:
System: Linux decomino 2.2.16 #1 Thu Jun 8 00:26:22 UTC 2000 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
>Description:

GCC, both C compiler and preprocessor, should not honour digraphs in
strict ISO/IEC 9899:1990 mode.

>How-To-Repeat:

See testcase c90-digraph-1.c in
<URL: http://gcc.gnu.org/ml/gcc-patches/2000-06/msg00898.html >.  The
quiet change involved in digraph support, tested by this testcase, is
described in ISO/IEC 9899:1990/Amd.1:1995(E) Annex H.1 (page 40).  The
testcase fails with gcc-ss-20000626.

>Fix:

Add flags for digraph support in the C compiler and the preprocessor,
and disable digraph support for -std=iso9899:1990 and -ansi (maybe
also -traditional).  Do whatever the right thing is when preprocessing
C++ and other non-C languages.
>Release-Note:
>Audit-Trail:
>Unformatted: