opts.h (CL_PCH_IGNORE): Define.

        * opts.h (CL_PCH_IGNORE): Define.
        * targhooks.c (option_affects_pch_p):
        Return false for options that have CL_PCH_IGNORE set.
        * opt-functions.awk: Process PchIgnore.
        * doc/options.texi: Document PchIgnore.

From-SVN: r208292

gcc/ChangeLog

+2014-03-03  Joern Rennecke  <joern.rennecke@embecosm.com>
+
+	* opts.h (CL_PCH_IGNORE): Define.
+	* targhooks.c (option_affects_pch_p):
+	Return false for options that have CL_PCH_IGNORE set.
+	* opt-functions.awk: Process PchIgnore.
+	* doc/options.texi: Document PchIgnore.
+
 2014-03-03  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	* config/rs6000/rs6000.c (rs6000_preferred_reload_class): Disallow

gcc/doc/options.texi

@@ -478,4 +478,8 @@ record.  @xref{Option file format}.
 @item NoDWARFRecord
 The option is omitted from the producer string written by
 @option{-grecord-gcc-switches}.
+
+@item PchIgnore
+Even if this is a target option, this option will not be recorded / compared
+to determine if a precompiled header file matches.
 @end table

gcc/opt-functions.awk

@@ -97,6 +97,7 @@ function switch_flags (flags)
 	result = result \
 	  test_flag("Common", flags, " | CL_COMMON") \
 	  test_flag("Target", flags, " | CL_TARGET") \
+	  test_flag("PchIgnore", flags, " | CL_PCH_IGNORE") \
 	  test_flag("Driver", flags, " | CL_DRIVER") \
 	  test_flag("Joined", flags, " | CL_JOINED") \
 	  test_flag("JoinedOrMissing", flags, " | CL_JOINED") \

gcc/opts.h

@@ -146,6 +146,7 @@ extern const unsigned int cl_lang_count;
 #define CL_SEPARATE		(1U << 23) /* If takes a separate argument.  */
 #define CL_UNDOCUMENTED		(1U << 24) /* Do not output with --help.  */
 #define CL_NO_DWARF_RECORD	(1U << 25) /* Do not add to producer string.  */
+#define CL_PCH_IGNORE		(1U << 26) /* Do compare state for pch.  */
 
 /* Flags for an enumerated option argument.  */
 #define CL_ENUM_CANONICAL	(1 << 0) /* Canonical for this value.  */

gcc/targhooks.c

@@ -1456,6 +1456,8 @@ option_affects_pch_p (int option, struct cl_option_state *state)
 {
   if ((cl_options[option].flags & CL_TARGET) == 0)
     return false;
+  if ((cl_options[option].flags & CL_PCH_IGNORE) != 0)
+    return false;
   if (option_flag_var (option, &global_options) == &target_flags)
     if (targetm.check_pch_target_flags)
       return false;