[gcc r11-4944] Specify reason of -Winvalid-pch warning

[Jeff Law]

https://gcc.gnu.org/g:cb808c583de59ea568fd240144cd9db07272f45e

commit r11-4944-gcb808c583de59ea568fd240144cd9db07272f45e
Author: Nicholas Guriev <guriev-ns@ya.ru>
Date:   Thu Nov 12 08:59:35 2020 -0500

    Specify reason of -Winvalid-pch warning
    
    gcc/c-family
            PR pch/86674
            * c-pch.c (c_common_valid_pch): Use cpp_warning with CPP_W_INVALID_PCH
            reason to fix -Werror=invalid-pch and -Wno-error=invalid-pch switches.
    
    libcpp
            PR pch/86674
            * files.c (_cpp_find_file): Use CPP_DL_NOTE not CPP_DL_ERROR in call to
            cpp_error.

Diff:
---
 gcc/c-family/c-pch.c | 40 +++++++++++++++-------------------------
 libcpp/files.c       |  2 +-
 2 files changed, 16 insertions(+), 26 deletions(-)

diff --git a/gcc/c-family/c-pch.c b/gcc/c-family/c-pch.c
index a2292f46a7d..9c0bd0b631d 100644
--- a/gcc/c-family/c-pch.c
+++ b/gcc/c-family/c-pch.c
@@ -211,8 +211,7 @@ c_common_valid_pch (cpp_reader *pfile, const char *name, int fd)
     fatal_error (input_location, "cannot read %s: %m", name);
   else if (sizeread != IDENT_LENGTH + 16)
     {
-      if (cpp_get_options (pfile)->warn_invalid_pch)
-	cpp_error (pfile, CPP_DL_WARNING, "%s: too short to be a PCH file",
+      cpp_warning (pfile, CPP_W_INVALID_PCH, "%s: too short to be a PCH file",
 		   name);
       return 2;
     }
@@ -220,27 +219,22 @@ c_common_valid_pch (cpp_reader *pfile, const char *name, int fd)
   pch_ident = get_ident();
   if (memcmp (ident, pch_ident, IDENT_LENGTH) != 0)
     {
-      if (cpp_get_options (pfile)->warn_invalid_pch)
-	{
-	  if (memcmp (ident, pch_ident, 5) == 0)
-	    /* It's a PCH, for the right language, but has the wrong version.
-	     */
-	    cpp_error (pfile, CPP_DL_WARNING,
+	if (memcmp (ident, pch_ident, 5) == 0)
+	  /* It's a PCH, for the right language, but has the wrong version.  */
+	  cpp_warning (pfile, CPP_W_INVALID_PCH,
 		       "%s: not compatible with this GCC version", name);
-	  else if (memcmp (ident, pch_ident, 4) == 0)
-	    /* It's a PCH for the wrong language.  */
-	    cpp_error (pfile, CPP_DL_WARNING, "%s: not for %s", name,
+	else if (memcmp (ident, pch_ident, 4) == 0)
+	  /* It's a PCH for the wrong language.  */
+	  cpp_warning (pfile, CPP_W_INVALID_PCH, "%s: not for %s", name,
 		       lang_hooks.name);
-	  else
-	    /* Not any kind of PCH.  */
-	    cpp_error (pfile, CPP_DL_WARNING, "%s: not a PCH file", name);
-	}
+	else
+	  /* Not any kind of PCH.  */
+	  cpp_warning (pfile, CPP_W_INVALID_PCH, "%s: not a PCH file", name);
       return 2;
     }
   if (memcmp (ident + IDENT_LENGTH, executable_checksum, 16) != 0)
     {
-      if (cpp_get_options (pfile)->warn_invalid_pch)
-	cpp_error (pfile, CPP_DL_WARNING,
+      cpp_warning (pfile, CPP_W_INVALID_PCH,
 		   "%s: created by a different GCC executable", name);
       return 2;
     }
@@ -257,8 +251,7 @@ c_common_valid_pch (cpp_reader *pfile, const char *name, int fd)
   if (v.debug_info_type != write_symbols
       && write_symbols != NO_DEBUG)
     {
-      if (cpp_get_options (pfile)->warn_invalid_pch)
-	cpp_error (pfile, CPP_DL_WARNING,
+      cpp_warning (pfile, CPP_W_INVALID_PCH,
 		   "%s: created with -g%s, but used with -g%s", name,
 		   debug_type_names[v.debug_info_type],
 		   debug_type_names[write_symbols]);
@@ -271,8 +264,7 @@ c_common_valid_pch (cpp_reader *pfile, const char *name, int fd)
     for (i = 0; i < MATCH_SIZE; i++)
       if (*pch_matching[i].flag_var != v.match[i])
 	{
-	  if (cpp_get_options (pfile)->warn_invalid_pch)
-	    cpp_error (pfile, CPP_DL_WARNING,
+	  cpp_warning (pfile, CPP_W_INVALID_PCH,
 		       "%s: settings for %s do not match", name,
 		       pch_matching[i].flag_name);
 	  return 2;
@@ -287,8 +279,7 @@ c_common_valid_pch (cpp_reader *pfile, const char *name, int fd)
      check one function.  */
   if (v.pch_init != &pch_init)
     {
-      if (cpp_get_options (pfile)->warn_invalid_pch)
-	cpp_error (pfile, CPP_DL_WARNING,
+      cpp_warning (pfile, CPP_W_INVALID_PCH,
 		   "%s: had text segment at different address", name);
       return 2;
     }
@@ -305,8 +296,7 @@ c_common_valid_pch (cpp_reader *pfile, const char *name, int fd)
     free (this_file_data);
     if (msg != NULL)
       {
-	if (cpp_get_options (pfile)->warn_invalid_pch)
-	  cpp_error (pfile, CPP_DL_WARNING, "%s: %s", name, msg);
+	cpp_warning (pfile, CPP_W_INVALID_PCH, "%s: %s", name, msg);
 	return 2;
       }
   }
diff --git a/libcpp/files.c b/libcpp/files.c
index 5af41364d0a..d73177aa1ee 100644
--- a/libcpp/files.c
+++ b/libcpp/files.c
@@ -571,7 +571,7 @@ _cpp_find_file (cpp_reader *pfile, const char *fname, cpp_dir *start_dir,
 			   "one or more PCH files were found,"
 			   " but they were invalid");
 		if (!cpp_get_options (pfile)->warn_invalid_pch)
-		  cpp_error (pfile, CPP_DL_ERROR,
+		  cpp_error (pfile, CPP_DL_NOTE,
 			     "use -Winvalid-pch for more information");
 	      }