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Output make-style dependencies with -M.

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

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

@@ -36,6 +36,9 @@

 ULONG ulMacroReturnValue;

+extern char *tzObjectname;

+extern FILE *dependfile;

+

 /*

  * defines for nCurrentStatus

  */

@@ -190,6 +193,9 @@

 	FILE *f;

 	if ((f = fopen(fname, "rb")) != NULL || errno != ENOENT) {

+		if (dependfile) {

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

+		}

 		return f;

 	}

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

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

@@ -28,6 +28,9 @@

 extern int yydebug;

+FILE *dependfile;

+extern char *tzObjectname;

+

 /*

  * Option stack

  */

@@ -258,7 +261,7 @@

 {

 	printf(

 "Usage: rgbasm [-hv] [-b chars] [-Dname[=value]] [-g chars] [-i path]\n"

-"              [-o outfile] [-p pad_value] file.asm\n");

+"              [-M dependfile] [-o outfile] [-p pad_value] file.asm\n");

 	exit(1);

 }

@@ -272,6 +275,8 @@

 	char *tzMainfile;

+	dependfile = NULL;

+

 	cldefines_size = 32;

 	cldefines = reallocarray(cldefines, cldefines_size,

 	                        2 * sizeof(void *));

@@ -301,7 +306,7 @@

 	newopt = CurrentOptions;

-	while ((ch = getopt(argc, argv, "b:D:g:hi:o:p:v")) != -1) {

+	while ((ch = getopt(argc, argv, "b:D:g:hi:M:o:p:v")) != -1) {

 		switch (ch) {

 		case 'b':

 			if (strlen(optarg) == 2) {

@@ -332,6 +337,11 @@

 		case 'i':

 			fstk_AddIncludePath(optarg);

 			break;

+		case 'M':

+			if ((dependfile = fopen(optarg, "w")) == NULL) {

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

+			}

+			break;

 		case 'o':

 			out_SetFileName(optarg);

 			break;

@@ -368,6 +378,10 @@

 	if (CurrentOptions.verbose) {

 		printf("Assembling %s\n", tzMainfile);

+	}

+

+	if (dependfile) {

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

 	}

 	nStartClock = clock();

--- a/src/asm/rgbasm.1

+++ b/src/asm/rgbasm.1

@@ -45,6 +45,11 @@

 option disables this behavior.

 .It Fl i Ar path

 Add an include path.

+.It Fl M Ar dependfile

+Print

+.Xr make 1

+dependencies to

+.Ar dependfile .

 .It Fl o Ar outfile

 Write an object file to the given filename.

 .It Fl p Ar pad_value

-- 

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