Error: bad value for -march= switch

Question

I wrote a Makefile and I can't get it to work. I have an option which is supposed to select which processor to compile to. However, when I run make from the commandline it says:

tandex@tandex-P-6860FX:~/emulators/nintendo sdks/3DS SDK [HomeBrew]$ make
gcc -march=arm7tdmi -static -fexceptions -fnon-call-exceptions -fstack-check test.c -c
test.c:1:0: error: bad value (arm7tdmi) for -march= switch

make: *** [ALL] Error 1

But in the man pages for gcc, it states that arm7tdmi is a permissible value. Am I missing something?

Makefile:

#3DS Compilation Makefile (c) TanDex (TEQ)RunawayFreelancers
#
#Version 0.99 (Alpha) For *nix Devices
#
#Please Check Back Soon for 3rd SDK

#SELECT THE COMPILER TO USE! GCC RECOMMENDED!
#FOR SANITY SAKE, USE C FILES WITH GCC AND CPP FILES WITH G++
CC=gcc
#CC=g++

#OBJECTCOPY REFERENCE, DO NOT REMOVE
OBJC=objcopy
OBJREFS= -O Binary

#SELECT THE PROCESSOR TO TUNE IT TO. ARMV7 (Nintendo DS) or ARMV9(Nintendo DS
(Graphical Support))
#or ARM11 Core ARM1176JZ-S and ARM1176JZF-S (3DS Processor? Not Sure if Correct. Try
and see if they Work?)
#
#NOTE: DS GAMES REQUIRE BOTH A ARM7 AND ARM9 BINARY. RUN THIS TWICE (ONCE FOR EACH)
#
#UNCOMMENT FOR PROCESOR

PROCESSOR=arm7tdmi
#PROCESSOR=arm946e-s
#PROCESSOR=arm1176jz-s
#PROCESSOR=arm1176jzf-s

#FILES
#
#PLACE ALL OF THE FILES HERE, THAT ARE BEING COMPILED!
FILES=test.c

#SET BIN FILE NAME BASED ON PROCESSOR SELECTED
ifeq($(PROCESSOR),arm7tdmi)\
NAME=ARM7.BIN
ifeq($(PROCESSOR), arm946e-s)\
NAME=ARM9.BIN
ifeq($(PROCESSOR), arm1176jz-s)\
NAME=ARM11.BIN
ifeq($(PROCESSOR), arm1176jzf-s)\
NAME=ARM11.BIN

#CREATE OBJECTS
ifeq($(CC), gcc)\
OBJECTS=$(FILES:.c=.o)
ifeq($(CC), g++)\
OBJECTS=$(FILES:.cpp=.o)

#FLAGS! DO NOT CHANGE THESE!!!!!!!!!!! THAT MEANS YOU!!!!!
#
#FOR THOSE WHO WANT TO KNOW WHAT THESE DO, HERE THEY ARE:
#-mtune=$(PROCESSOR)        FORE THE COMPILER TO TUNE OUTPUT TO THE SPECIFIED
PROCESSOR
#-static            REQUIRED FOR CLEAN BINARY OUTPUT?? (NOT SURE WHAT THIS
DOES, BUT WAS SUGESTED ON A POST ON STACKOVERFLOW)
#-fexceptions           FORCE EXCEPTIONS
#-fnon-call-exceptions      FORCE EXCEPTIONS TO ONLY BE RETURNED BY THE SYSTEM
(MEMORY AND FPU INSTRUTIONS FOR EXAMPLE)
#-fstack-check          FORCE STACK CHECKING (DS / 3DS USE AWKWARD STACK
IMPLEMENTATION)
CFLAGS=-march=$(PROCESSOR) -static -fexceptions -fnon-call-exceptions -fstack-check

ALL:
$(CC) $(CFLAGS) $(FILES) -c
.c.o:
$(OBJC) $(OBJREFS) $(OBJECTS) $(NAME)
.cpp.o:
$(OBJC) $(OBJREFS) $(OBJECTS) $(NAME)

Answer 1

You are probably not calling the right gcc. You seem to be calling the gcc installed in your system, rather than the one that comes with the 3DS SDK.

Answer 2

It appears the problem is with -march=arm7tdmi.

I think the workaround is to avoid using -march=arm7tdmi; and use -march=cpu-type, where cpu-type is one of the ones listed at 3.17.4 ARM Options of the GCC manual.

Here's part of the page:

-march=name

This specifies the name of the target ARM architecture. GCC uses this name to determine what kind of instructions it can emit when generating assembly code. This option can be used in conjunction with or instead of the -mcpu= option. Permissible names are: ‘armv2’, ‘armv2a’, ‘armv3’, ‘armv3m’, ‘armv4’, ‘armv4t’, ‘armv5’, ‘armv5t’, ‘armv5e’, ‘armv5te’, ‘armv6’, ‘armv6j’, ‘armv6t2’, ‘armv6z’, ‘armv6kz’, ‘armv6-m’, ‘armv7’, ‘armv7-a’, ‘armv7-r’, ‘armv7-m’, ‘armv7e-m’, ‘armv7ve’, ‘armv8-a’, ‘armv8-a+crc’, ‘iwmmxt’, ‘iwmmxt2’, ‘ep9312’.