FreeDOS/mkfiles/gcc.mak

#
# GCC.MAK - kernel compiler options for ia16-elf-gcc
#

#**********************************************************************
#* TARGET    : we create a %TARGET%.sys file
#* TARGETOPT : options, handled down to the compiler
#**********************************************************************

TARGET=KGC$(XCPU)$(XFAT)
TARGETOPT=-march=i8086

ifeq ($(XCPU),186)
TARGETOPT=march=i80186
ALLCFLAGS+=-DI186
endif
ifeq ($(XCPU),386)
TARGETOPT=-march=i80286
ALLCFLAGS+=-DI386
endif

ifeq ($(XFAT),32)
ALLCFLAGS+=-DWITHFAT32
NASMFLAGS+=-DWITHFAT32
endif

NASM=$(XNASM)
NASMFLAGS+=-i../hdr/ -DXCPU=$(XCPU) -felf -o $@

CC=ia16-elf-gcc -c
CL=ia16-elf-gcc
INCLUDEPATH=.

LIBUTIL=ar crs
LIBPLUS=
LIBTERM=

TINY=-mcmodel=tiny
CFLAGST=-Os -fpack-struct -fcall-used-es -w -o $@
CFLAGSC=

#
# heavy stuff - building  
#
# -mcmodel=small small memory model (small code/small data)
# -Os           -> favor code size over execution time in optimizations
# -fleading-underscore underscores leading field for DOS compiler compat
# -fno-common    no "common" variables, just BSS for uninitialized data
# -fpack-struct pack structure members
# -ffreestanding don't assume any headers
# -fcall-used-es es clobbered in function calls
# -mrtd         use stdcall calling convention
# -w            disable warnings for now
# -Werror       treat all warnings as errors

ALLCFLAGS+=-I../hdr $(TARGETOPT) -mcmodel=small -fleading-underscore -fno-common -fpack-struct -ffreestanding -fcall-used-es -mrtd -w -Werror -Os
INITCFLAGS=$(ALLCFLAGS) -o $@
CFLAGS=$(ALLCFLAGS) -o $@

DIRSEP=/
RM=rm -f
CP=cp
ECHOTO=echo>>
ifeq ($(LOADSEG)0, 0)
LOADSEG=0x60
endif

INITPATCH=objcopy --redefine-sym ___umodsi3=_init_umodsi3 --redefine-sym ___udivsi3=_init_udivsi3 --redefine-sym ___ashlsi3=_init_ashlsi3 --redefine-sym ___lshrsi3=_init_lshrsi3
CLDEF=1
CLT=gcc -DDOSC_TIME_H -I../hdr -o $@
CLC=$(CLT)
LINK=$(XLINK) -Tkernel.ld -Wl,-Map,kernel.map -o kernel.exe $(OBJS) -Wl,--whole-archive ../drivers/device.lib -Wl,--no-whole-archive \#

.SUFFIXES: .obj .asm

#               *Implicit Rules*
.asm.obj :
	$(NASM) -D$(COMPILER) $(NASMFLAGS) $*.asm

.c.obj :
	$(CC) $(CFLAGS) $*.c
C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`#`
			`# GCC.MAK - kernel compiler options for ia16-elf-gcc`
			`#`

For GCC builds use GNU make instead of wmake throughout. This eliminates all build-dependencies on Open Watcom. 2017-12-21 19:38:41 +01:00			`#**********************************************************************`
			`#* TARGET : we create a %TARGET%.sys file`
			`#* TARGETOPT : options, handled down to the compiler`
			`#**********************************************************************`

			`TARGET=KGC$(XCPU)$(XFAT)`
			`TARGETOPT=-march=i8086`

			`ifeq ($(XCPU),186)`
			`TARGETOPT=march=i80186`
			`ALLCFLAGS+=-DI186`
			`endif`
			`ifeq ($(XCPU),386)`
			`TARGETOPT=-march=i80286`
			`ALLCFLAGS+=-DI386`
			`endif`

			`ifeq ($(XFAT),32)`
			`ALLCFLAGS+=-DWITHFAT32`
			`NASMFLAGS+=-DWITHFAT32`
			`endif`

			`NASM=$(XNASM)`
			`NASMFLAGS+=-i../hdr/ -DXCPU=$(XCPU) -felf -o $@`

C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`CC=ia16-elf-gcc -c`
ia16-elf-gcc: provide GNU LD linker script and symbols to link kernel. The resulting kernel and sys.com do not work yet (kernel prints 123 only). Some functions in sys.com are placeholders. 2017-12-19 16:40:39 +01:00			`CL=ia16-elf-gcc`
C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`INCLUDEPATH=.`

Use "ar" instead of "wlib" in gcc build. 2017-12-21 18:40:34 +01:00			`LIBUTIL=ar crs`
C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`LIBPLUS=`
			`LIBTERM=`

			`TINY=-mcmodel=tiny`
sys.com compiled with ia16-elf-gcc: fill in missing functions. 2017-12-21 18:35:47 +01:00			`CFLAGST=-Os -fpack-struct -fcall-used-es -w -o $@`
C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`CFLAGSC=`

			`#`
			`# heavy stuff - building`
			`#`
			`# -mcmodel=small small memory model (small code/small data)`
ia16-elf-gcc: provide GNU LD linker script and symbols to link kernel. The resulting kernel and sys.com do not work yet (kernel prints 123 only). Some functions in sys.com are placeholders. 2017-12-19 16:40:39 +01:00			`# -Os -> favor code size over execution time in optimizations`
C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`# -fleading-underscore underscores leading field for DOS compiler compat`
			`# -fno-common no "common" variables, just BSS for uninitialized data`
			`# -fpack-struct pack structure members`
			`# -ffreestanding don't assume any headers`
			`# -fcall-used-es es clobbered in function calls`
			`# -mrtd use stdcall calling convention`
			`# -w disable warnings for now`
			`# -Werror treat all warnings as errors`

For GCC builds use GNU make instead of wmake throughout. This eliminates all build-dependencies on Open Watcom. 2017-12-21 19:38:41 +01:00			`ALLCFLAGS+=-I../hdr $(TARGETOPT) -mcmodel=small -fleading-underscore -fno-common -fpack-struct -ffreestanding -fcall-used-es -mrtd -w -Werror -Os`
C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`INITCFLAGS=$(ALLCFLAGS) -o $@`
			`CFLAGS=$(ALLCFLAGS) -o $@`

			`DIRSEP=/`
			`RM=rm -f`
ia16-elf-gcc: provide GNU LD linker script and symbols to link kernel. The resulting kernel and sys.com do not work yet (kernel prints 123 only). Some functions in sys.com are placeholders. 2017-12-19 16:40:39 +01:00			`CP=cp`
C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`ECHOTO=echo>>`
For GCC builds use GNU make instead of wmake throughout. This eliminates all build-dependencies on Open Watcom. 2017-12-21 19:38:41 +01:00			`ifeq ($(LOADSEG)0, 0)`
			`LOADSEG=0x60`
			`endif`

Create init varieties for unsigned long helper functions. An INITPATCH is used to make sure the correct symbols are used. The GCC kernel now shows the copyright string and boots a little further. 2017-12-19 19:46:49 +01:00			`INITPATCH=objcopy --redefine-sym ___umodsi3=_init_umodsi3 --redefine-sym ___udivsi3=_init_udivsi3 --redefine-sym ___ashlsi3=_init_ashlsi3 --redefine-sym ___lshrsi3=_init_lshrsi3`
C source code changes so the kernel can compile with ia16-elf-gcc. Use "make all COMPILER=gcc". Linking does not work yet with these changes. 2017-12-19 13:29:43 +01:00			`CLDEF=1`
			`CLT=gcc -DDOSC_TIME_H -I../hdr -o $@`
			`CLC=$(CLT)`
For GCC builds use GNU make instead of wmake throughout. This eliminates all build-dependencies on Open Watcom. 2017-12-21 19:38:41 +01:00			`LINK=$(XLINK) -Tkernel.ld -Wl,-Map,kernel.map -o kernel.exe $(OBJS) -Wl,--whole-archive ../drivers/device.lib -Wl,--no-whole-archive \#`

			`.SUFFIXES: .obj .asm`

			`# Implicit Rules`
			`.asm.obj :`
			`$(NASM) -D$(COMPILER) $(NASMFLAGS) $*.asm`

			`.c.obj :`
			`$(CC) $(CFLAGS) $*.c`