add option/pragma erroraswarn, which force (or not) to treat the cpp #error directive as a #warning instead

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@7926 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Source/Modules/main.cxx

@@ -67,6 +67,7 @@ static const char *usage1 = (const char*)"\
      -ignoremissing  - Ignore missing include files\n\
      -importall      - Follow all #include statements as imports\n\
      -includeall     - Follow all #include statements\n\
+     -erroraswarn <v>- Treat (or not) the CPP #error statement as #warning instead\n\
      -l<ifile>       - Include SWIG library file <ifile>\n\
      -M              - List all dependencies \n\
      -MD             - Is equivalent to `-M -MF <file>', except `-E' is not implied\n\
@@ -517,6 +518,18 @@ void SWIG_getoptions(int argc, char *argv[])
 	  } else if (strcmp(argv[i],"-ignoremissing") == 0) {
 	    Preprocessor_ignore_missing(1);
 	    Swig_mark_arg(i);
+	  } else if (strcmp(argv[i],"-erroraswarn") == 0) {
+	    String *erroraswarn = 0;
+	    Swig_mark_arg(i);
+	    if (argv[i+1]) {
+	      erroraswarn = NewString(argv[i+1]);	    
+	      Swig_mark_arg(i+1);
+	    }
+	    if (!erroraswarn) {
+	      Swig_arg_error();
+	    } else {
+	      Preprocessor_error_as_warning(atoi(Char(erroraswarn)));
+	    }
 	  } else if (strcmp(argv[i],"-tm_debug") == 0) {
 	    tm_debug = 1;
 	    Swig_mark_arg(i);

Source/Preprocessor/cpp.c

@@ -30,6 +30,7 @@ static int       single_include = 1;     /* Only include each file once */
 static Hash     *included_files = 0;
 static List     *dependencies = 0;
 static SwigScanner *id_scan = 0;
+static int       error_as_warning = 0;    /* Understand the cpp #error directive as a #warning */
 
 /* Test a character to see if it starts an identifier */
 #define isidentifier(c) ((isalpha(c)) || (c == '_') || (c == '$'))
@@ -247,6 +248,10 @@ void Preprocessor_ignore_missing(int a) {
   ignore_missing = a;
 }
 
+void Preprocessor_error_as_warning(int a) {
+  error_as_warning = a;
+}
+
 
 /* -----------------------------------------------------------------------------
  * Preprocessor_define()
@@ -1520,7 +1525,11 @@ Preprocessor_parse(String *s)
 	}
       } else if (StringEqual(id,k_error)) {
 	if (allow) {
-	  Swig_error(Getfile(s),Getline(id),"%s\n",value);
+	  if (error_as_warning) {
+	    Swig_warning(WARN_PP_CPP_WARNING,Getfile(s),Getline(id),"%s\n", value);
+	  } else {
+	    Swig_error(Getfile(s),Getline(id),"%s\n",value);
+	  }
 	}
       } else if (StringEqual(id,k_line)) {
       } else if (StringEqual(id,k_include)) {
@@ -1568,9 +1577,12 @@ Preprocessor_parse(String *s)
 	  char *c = Char(value)+5;
 	  while (*c && (isspace((int)*c))) c++;
 	  if (*c) {
-	    if (Strncmp(c,"nowarn=",7) == 0) {
+	    if (strncmp(c,"nowarn=",7) == 0) {
 	      Swig_warnfilter(c+7,1);
 	    }
+	    else if (strncmp(c,"erroraswarn=",7) == 0) {
+	      error_as_warning = atoi(c+12);
+	    }
 	  }
 	}
       } else if (StringEqual(id,k_level)) {

Source/Preprocessor/preprocessor.h

@@ -29,6 +29,7 @@ extern String *Preprocessor_parse(String *s);
 extern void    Preprocessor_include_all(int);
 extern void    Preprocessor_import_all(int);
 extern void    Preprocessor_ignore_missing(int);
+extern void    Preprocessor_error_as_warning(int);
 extern List   *Preprocessor_depend(void);
 extern void    Preprocessor_expr_init(void);
 extern void    Preprocessor_expr_delete(void);