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Add pragma directive to cc1

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -49,6 +49,14 @@

 	error("#include expects \"FILENAME\" or <FILENAME>");

 }

+static char *

+pragma(char *s)

+{

+	while (*s)

+		++s;

+	return s;

+}

+

 char *

 preprocessor(char *p)

 {

@@ -56,10 +64,12 @@

 	unsigned short n;

 	static char **bp, *cmds[] = {

 		"include",

+		"pragma",

 		NULL

 	};

 	static char *(*funs[])(char *) = {

-		include

+		include,

+		pragma

 	};

 	while (isspace(*p))