* c-common.c, c-decl.c, c-lex.c, c-objc-common.c, c-opts.c,
c-parse.in, c-pragma.c, c-typeck.c: Use %q, %< and %> for quoting
in diagnostics. Use %' for English apostrophes.
* c-tree.h (ATTRIBUTE_GCC_CDIAG): Define.
(pedwarn_c90, pedwarn_c99): Use it.
* c-decl.c (lookup_label): Quote label name in diagnostic.
* c-parse.in (yyprint): Use ' instead of ` for left quote.
* c-typeck.c (warn_for_assignment): Likewise.
testsuite:
* g++.dg/warn/Wswitch-1.C, g++.dg/warn/Wswitch-2.C,
gcc.dg/Wswitch-2.c, gcc.dg/Wswitch-enum.c, gcc.dg/Wswitch.c,
gcc.dg/declspec-9.c, gcc.dg/declspec-10.c, gcc.dg/declspec-11.c,
gcc.dg/m-un-2.c, gcc.dg/noreturn-1.c, gcc.dg/wtr-conversion-1.c:
Update expected messages.
From-SVN: r87413
