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Add -MP option
Adds a phony target to every included file, mimicking gcc's

--- a/include/asm/main.h

+++ b/include/asm/main.h

@@ -36,6 +36,8 @@

 extern FILE *dependfile;

+extern bool oGeneratePhonyDeps;

+

 void opt_Push(void);

 void opt_Pop(void);

 void opt_Parse(char *s);

--- a/src/asm/fstack.c

+++ b/src/asm/fstack.c

@@ -337,8 +337,11 @@

 	f = fopen(fname, "rb");

 	if (f != NULL || errno != ENOENT) {

-		if (dependfile)

+		if (dependfile) {

 			fprintf(dependfile, "%s: %s\n", tzObjectname, fname);

+			if (oGeneratePhonyDeps)

+				fprintf(dependfile, "%s:\n", fname);

+		}

 		return f;

 	}

@@ -364,8 +367,11 @@

 		if (f != NULL || errno != ENOENT) {

 			if (dependfile) {

 				fprintf(dependfile, "%s: %s\n", tzObjectname,

-					path);

+					fname);

+				if (oGeneratePhonyDeps)

+					fprintf(dependfile, "%s:\n", fname);

 			}

+

 			if (incPathUsed)

 				*incPathUsed = IncludePaths[i];

 			return f;

--- a/src/asm/main.c

+++ b/src/asm/main.c

@@ -47,6 +47,8 @@

 FILE *dependfile;

+bool oGeneratePhonyDeps;

+

 /*

  * Option stack

  */

@@ -270,7 +272,7 @@

 {

 	fputs(

 "Usage: rgbasm [-EhLVvw] [-b chars] [-D name[=value]] [-g chars] [-i path]\n"

-"              [-M depend_file] [-o out_file] [-p pad_value] [-r depth]\n"

+"              [-M depend_file] [-MP] [-o out_file] [-p pad_value] [-r depth]\n"

 "              [-W warning] <file> ...\n"

 "Useful options:\n"

 "    -E, --export-all         export all labels\n"

@@ -306,6 +308,7 @@

 	/* yydebug=1; */

 	nMaxRecursionDepth = 64;

+	oGeneratePhonyDeps = false;

 	DefaultOptions.gbgfx[0] = '0';

 	DefaultOptions.gbgfx[1] = '1';

@@ -361,9 +364,19 @@

 			newopt.optimizeloads = false;

 			break;

 		case 'M':

-			dependfile = fopen(optarg, "w");

-			if (dependfile == NULL)

-				err(1, "Could not open dependfile %s", optarg);

+			ep = strchr("P", optarg[0]);

+			if (!ep || !*ep || optarg[1]) {

+				dependfile = fopen(optarg, "w");

+				if (dependfile == NULL)

+					err(1, "Could not open dependfile %s",

+					    optarg);

+			} else {

+				switch (optarg[0]) {

+				case 'P':

+					oGeneratePhonyDeps = true;

+					break;

+				}

+			}

 			break;

 		case 'o':