dj64.mk changes/cleanups to work with MacOS

[bartoldeman]

1. Get most cross asm tools via autoconf instead of the make logic.
2. We need -x assembler-with-cpp instead of -x assembler, otherwise with a .s file preprocessor #ifdef's are ignored (and for .S we already have a cross rule, not good for tmp.s)
3. -rpath=xx needs to be -rpath xx, so from compiler -Wl,-rpath,xx
4. .section in asm is different on MacOS

[stsp]

I think such design is problematic.
Basically what you assume is
that user's configuration
(installed tool-chains etc)
matches the build one, which
is LP. This is simply not true,
so I don't think we can generate
dj64.mk this way.
But I am not saying there is
no problem with current design.
I fully agree that dj64.mk is
over-convoluted.
But we need another solution.

[stsp]

I added #41 with some
idea on top of your patch.

[bartoldeman]

yes, I thought there was a catch somewhere! I think dj64.mk can be simplified a bit by grouping some things together, it's so it's more clear what the if/endif belong too, but yes it's a bit of emulation of configure in a sense, whether comcom64 would then also run this configure I'm not sure...

ifeq ($(filter clean install,$(MAKECMDGOALS)),)
MACH = $(subst -, ,$(shell $(CC) -dumpmachine))
ifeq ($(MACH),)
$(error unknown target architecture)
endif
OS = $(shell uname -s)
NATIVE=0
ifneq ($(filter x86_64 amd64 i686 i386,$(MACH)),)
ifneq ($(OS), Darwin)
NATIVE = 1
endif
endif

# find the suitable cross-assembler
DJ64AS = $(CROSS_PREFIX)as
DJ64ASFLAGS = --32 --defsym _DJ64=1
XSTRIP = $(CROSS_PREFIX)strip --strip-debug
XLD = $(CROSS_PREFIX)ld
XLD_IMB = -Ttext-segment

ifeq ($(CROSS_PREFIX),)
CROSS_PREFIX := i686-linux-gnu-
ifeq ($(shell $(DJ64AS) --version 2>/dev/null),)
CROSS_PREFIX := x86_64-linux-gnu-
ifeq ($(shell $(DJ64AS) --version 2>/dev/null),)
CROSS_PREFIX :=
endif
endif
else ifeq ($(shell $(DJ64AS) --version 2>/dev/null),)
# CROSS_PREFIX already set
$(error invalid CROSS_PREFIX)
endif

ifeq ($(CROSS_PREFIX),)
ifeq ($(NATIVE), 1)

# natively-compiling, as not found
ifeq ($(shell $(DJ64AS) --version 2>/dev/null),)
# found nothing, try built-in assembler
DJ64AS = $(CC) -x assembler
DJ64ASFLAGS = -m32 -Wa,-defsym,_DJ64=1 -c
endif

else

# cross-compiling, as not found
ifeq ($(shell clang --version 2>/dev/null),)
$(error cross-binutils not installed)
endif
DJ64AS = clang -x assembler -target i686-unknown-linux-gnu
DJ64ASFLAGS = -Wa,-defsym,_DJ64=1 -c
XSTRIP = llvm-strip --strip-debug
ifeq ($(shell $(XSTRIP) --version 2>/dev/null),)
XSTRIP = /usr/local/opt/llvm/bin/llvm-strip --strip-debug
ifeq ($(shell $(XSTRIP) --version 2>/dev/null),)
$(error llvm-strip not found)
endif
endif
XLD = ld.lld
XLD_IMB = --image-base

endif
endif

endif # filter clean install

up to you if you want #41 or the above.

[stsp]

I don't really care at that point.
Be it just configure alone - fine,
I would prefer that.
But there is also config.sub,
config.guess, install-sh and all
the alike! Almost 0.5Mb of
the trash code for nothing.
So feel free to push your
cleanup patch.

[stsp]

So if you don't add the
patch, I'll take that as an
approval of #41 :)

[bartoldeman]

I did now, just did something else in the mean time :)

[stsp]

Thanks!