[gcc r12-6195] c-family: Have -Wformat-diag accept "decl-specifier" [PR103758]

[Marek Polacek]

https://gcc.gnu.org/g:bb936163e28fdbe1a751c55d5e5975e036322a3d

commit r12-6195-gbb936163e28fdbe1a751c55d5e5975e036322a3d
Author: Marek Polacek <polacek@redhat.com>
Date:   Fri Dec 17 14:34:12 2021 -0500

    c-family: Have -Wformat-diag accept "decl-specifier" [PR103758]
    
    I'm tired of seeing
    
    cp/parser.c:15923:55: warning: misspelled term 'decl' in format; use 'declaration' instead [-Wformat-diag]
    cp/parser.c:15925:57: warning: misspelled term 'decl' in format; use 'declaration' instead [-Wformat-diag]
    
    every time I compile cp/parser.c, which happens...a lot.  I'd like my
    compilation to be free of warnings, otherwise I'm going to miss some
    important ones.
    
    "decl-specifiers" is a C++ grammar term; it is not actual code, so
    should not be wrapped with %< %>.  I hope we can accept it as an exception
    in check_tokens.
    
    It was surrounded by %< %> in cp_parser_decl_specifier_seq, so fix that.
    
    In passing, fix a misspelling in missspellings.
    
            PR c++/103758
    
    gcc/c-family/ChangeLog:
    
            * c-format.c (check_tokens): Accept "decl-specifier*".
    
    gcc/cp/ChangeLog:
    
            * parser.c (cp_parser_decl_specifier_seq): Replace %<decl-specifier%>
            with %qD.
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/cpp0x/constexpr-condition.C: Adjust dg-error.

Diff:
---
 gcc/c-family/c-format.c                          | 8 +++++++-
 gcc/cp/parser.c                                  | 2 +-
 gcc/testsuite/g++.dg/cpp0x/constexpr-condition.C | 2 +-
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/gcc/c-family/c-format.c b/gcc/c-family/c-format.c
index 7d3b3117ee2..afa77810a5c 100644
--- a/gcc/c-family/c-format.c
+++ b/gcc/c-family/c-format.c
@@ -3194,7 +3194,7 @@ check_tokens (const token_t *tokens, unsigned ntoks,
 			   wlen, format_chars);
   else
     {
-      /* Diagnose some common missspellings.  */
+      /* Diagnose some common misspellings.  */
       for (unsigned i = 0; i != sizeof badwords / sizeof *badwords; ++i)
 	{
 	  unsigned badwlen = strspn (badwords[i].name, " -");
@@ -3215,6 +3215,12 @@ check_tokens (const token_t *tokens, unsigned ntoks,
 		  plural = "s";
 		}
 
+	      /* As an exception, don't warn about "decl-specifier*" since
+		 it's a C++ grammar production.  */
+	      if (badwords[i].name[0] == 'd'
+		  && startswith (format_chars, "decl-specifier"))
+		continue;
+
 	      format_warning_substr (format_string_loc, format_string_cst,
 				     fmtchrpos, fmtchrpos + badwords[i].len,
 				     opt,
diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index 4475f792916..6b91a0ce491 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -15821,7 +15821,7 @@ cp_parser_decl_specifier_seq (cp_parser* parser,
       if (found_decl_spec
 	  && (flags & CP_PARSER_FLAGS_ONLY_TYPE_OR_CONSTEXPR)
 	  && token->keyword != RID_CONSTEXPR)
-	error ("%<decl-specifier%> invalid in condition");
+	error ("%qD invalid in condition", ridpointers[token->keyword]);
 
       if (found_decl_spec
 	  && (flags & CP_PARSER_FLAGS_ONLY_MUTABLE_OR_CONSTEXPR)
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-condition.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-condition.C
index 733d494c4d7..e81acba68ae 100644
--- a/gcc/testsuite/g++.dg/cpp0x/constexpr-condition.C
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-condition.C
@@ -5,5 +5,5 @@ constexpr int something() { return 3; }
 
 int main() {
   if (constexpr long v = something()) {}
-  if (static long v = something()) { } // { dg-error "'decl-specifier' invalid" }
+  if (static long v = something()) { } // { dg-error "'static' invalid" }
 }