re PR fortran/19101 (missing & in character continuation not caught)

2006-03-14  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/19101
	* gfortran.h: Add warn_ampersand.
	* invoke.texi: Add documentation for new option.
	* lang.opt: Add Wampersand.
	* options.c (gfc_init_options): Initialize warn_ampersand.
	(gfc_post_options): Set the warn if pedantic.
	(set_Wall): Set warn_ampersand.
	(gfc_handle_option: Add Wampersand for itself, -std=f95, and -std=f2003.
	* scanner.c (gfc_next_char_literal): Add test for missing '&' in
	continued character constant and give warning if missing.

From-SVN: r112078

gcc/fortran/ChangeLog

+2006-03-14  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR fortran/19101
+	* gfortran.h: Add warn_ampersand.
+	* invoke.texi: Add documentation for new option.
+	* lang.opt: Add Wampersand.
+	* options.c (gfc_init_options): Initialize warn_ampersand.
+	(gfc_post_options): Set the warn if pedantic.
+	(set_Wall): Set warn_ampersand.
+	(gfc_handle_option: Add Wampersand for itself, -std=f95, and -std=f2003.
+	* scanner.c (gfc_next_char_literal): Add test for missing '&' in
+	continued character constant and give warning if missing.
+
 2006-03-14  Steven G. Kargl  <kargls@comcast.net>
 
 	PR 18537

gcc/fortran/gfortran.h

@@ -1602,6 +1602,7 @@ typedef struct
   int verbose;
 
   int warn_aliasing;
+  int warn_ampersand;
   int warn_conversion;
   int warn_implicit_interface;
   int warn_line_truncation;

gcc/fortran/invoke.texi

@@ -128,7 +128,7 @@ by type.  Explanations are in the following sections.
 @xref{Warning Options,,Options to Request or Suppress Warnings}.
 @gccoptlist{
 -fsyntax-only  -pedantic  -pedantic-errors @gol
--w  -Wall  -Waliasing  -Wconversion -Wimplicit-interface @gol
+-w  -Wall  -Waliasing -Wampersand -Wconversion -Wimplicit-interface @gol
 -Wtabs -Wnonstd-intrinsics -Wsurprising -Wunderflow @gol
 -Wunused-labels -Wline-truncation -W}
 
@@ -375,11 +375,11 @@ Inhibit all warning messages.
 @item -Wall
 @cindex all warnings
 @cindex warnings, all
-Enables commonly used warning options that which pertain to usage that
-we recommend avoiding and that we believe is easy to avoid.
+Enables commonly used warning options pertaining to usage that
+we recommend avoiding and that we believe are easy to avoid.
 This currently includes @option{-Wunused-labels}, @option{-Waliasing},
-@option{-Wsurprising}, @option{-Wnonstd-intrinsic},  @option{-Wno-tabs},
-and @option{-Wline-truncation}.
+@option{-Wampersand}, @option{-Wsurprising}, @option{-Wnonstd-intrinsic},
+@option{-Wno-tabs}, and @option{-Wline-truncation}.
 
 
 @cindex -Waliasing option
@@ -405,6 +405,17 @@ The following example will trigger the warning.
 @end smallexample
 
 
+@cindex -Wampersand option
+@cindex options, -Wampersand
+@item -Wampersand
+@cindex ampersand
+Warn about missing ampersand in continued character constants. The warning is
+given with @option{-Wampersand}, @option{-pedantic}, @option{-std=f95}, and
+@option{-std=f2003}. Note: With no ampersand given in a continued character
+constant, gfortran assumes continuation at the first non-comment,
+non-whitespace character after the ampersand that initiated the continuation.
+
+
 @cindex -Wconversion option
 @cindex options, -Wconversion
 @item -Wconversion
@@ -445,6 +456,7 @@ lower value is greater than its upper value.
 A LOGICAL SELECT construct has three CASE statements.
 @end itemize
 
+
 @cindex -Wtabs
 @cindex options, -Wtabs
 @item -Wtabs
@@ -454,6 +466,7 @@ of the Fortran Character Set.  @option{-Wno-tabs} will cause a warning
 to be issued if a tab is encountered. Note, @option{-Wno-tabs} is active
 for @option{-pedantic}, @option{-std=f95}, and @option{-Wall}.
 
+
 @cindex -Wunderflow
 @cindex options, -Wunderflow
 @item -Wunderflow

gcc/fortran/lang.opt

@@ -41,6 +41,10 @@ Waliasing
 Fortran
 Warn about possible aliasing of dummy arguments
 
+Wampersand
+Fortran
+Warn about missing ampersand in continued character constants
+
 Wconversion
 Fortran
 Warn about implicit conversion

gcc/fortran/options.c

@@ -52,6 +52,7 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
   gfc_option.verbose = 0;
 
   gfc_option.warn_aliasing = 0;
+  gfc_option.warn_ampersand = 0;
   gfc_option.warn_conversion = 0;
   gfc_option.warn_implicit_interface = 0;
   gfc_option.warn_line_truncation = 0;
@@ -271,6 +272,9 @@ gfc_post_options (const char **pfilename)
   /* Implement -fno-automatic as -fmax-stack-var-size=0.  */
   if (!gfc_option.flag_automatic)
     gfc_option.flag_max_stack_var_size = 0;
+  
+  if (pedantic)
+    gfc_option.warn_ampersand = 1;
 
   return false;
 }
@@ -283,6 +287,7 @@ set_Wall (void)
 {
 
   gfc_option.warn_aliasing = 1;
+  gfc_option.warn_ampersand = 1;
   gfc_option.warn_line_truncation = 1;
   gfc_option.warn_nonstd_intrinsics = 1;
   gfc_option.warn_surprising = 1;
@@ -385,6 +390,10 @@ gfc_handle_option (size_t scode, const char *arg, int value)
       gfc_option.warn_aliasing = value;
       break;
 
+    case OPT_Wampersand:
+      gfc_option.warn_ampersand = value;
+      break;
+
     case OPT_Wconversion:
       gfc_option.warn_conversion = value;
       break;
@@ -553,6 +562,7 @@ gfc_handle_option (size_t scode, const char *arg, int value)
       gfc_option.allow_std = GFC_STD_F95_OBS | GFC_STD_F95 | GFC_STD_F77;
       gfc_option.warn_std = GFC_STD_F95_OBS;
       gfc_option.max_identifier_length = 31;
+      gfc_option.warn_ampersand = 1;
       gfc_option.warn_tabs = 0;
       break;
 
@@ -561,6 +571,7 @@ gfc_handle_option (size_t scode, const char *arg, int value)
 	| GFC_STD_F2003 | GFC_STD_F95;
       gfc_option.warn_std = GFC_STD_F95_OBS;
       gfc_option.max_identifier_length = 63;
+      gfc_option.warn_ampersand = 1;
       break;
 
     case OPT_std_gnu:

gcc/fortran/scanner.c

@@ -680,7 +680,12 @@ restart:
 	}
 
       if (c != '&')
-	gfc_current_locus = old_loc;
+	{
+	  if (in_string && gfc_option.warn_ampersand)
+	    gfc_warning ("Missing '&' in continued character constant at %C");
+
+	  gfc_current_locus.nextc--;
+	}
     }
   else
     {
@@ -978,7 +983,7 @@ load_line (FILE * input, char **pbuf, int *pbuflen)
 	  if (i >= buflen)
 	    {
 	      /* Reallocate line buffer to double size to hold the
-	         overlong line.  */
+		overlong line.  */
 	      buflen = buflen * 2;
 	      *pbuf = xrealloc (*pbuf, buflen + 1);
 	      buffer = (*pbuf)+i;