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Generate per-function ELF sections to enable --gc-sections

Use diffirent directive syntax for ELF and Mach-O respectively

--- a/6/gengas.c

+++ b/6/gengas.c

@@ -244,6 +244,17 @@

 {

 	size_t i, j;

+	switch (asmsyntax) {

+	case Gnugaself:

+		fprintf(fd, ".section .text.%s,\"ax\",@progbits\n", fn->name);

+		fprintf(fd, ".type %s, @function\n", fn->name);

+		break;

+	case Gnugasmacho:

+		fprintf(fd, ".section __TEXT,__text,regular\n");

+		break;

+	default:

+		die("unknown target");  break;

+	}

 	if (fn->isexport)

 		fprintf(fd, ".globl %s\n", fn->name);

 	fprintf(fd, "%s:\n", fn->name);