Cross-compiliation fails due to invocation of objstrip during build

[glaubitz]

The aboot boot loader is currently not cross-buildable on x86_64 since the build process invokes tools/objstrip at some point during the build to strip the ELF headers from both the aboot and bootlx binaries:

glaubitz@nofan:..glaubitz/aboot> make all CC=alpha-linux-gnu-gcc LD=alpha-linux-gnu-ld
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -D__ASSEMBLY__ -c -o head.o head.S
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o aboot.o aboot.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o cons.o cons.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o utils.o utils.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o zip/misc.o zip/misc.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o zip/unzip.o zip/unzip.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o zip/inflate.o zip/inflate.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o disk.o disk.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o fs/ext2.o fs/ext2.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o fs/ufs.o fs/ufs.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o fs/dummy.o fs/dummy.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -c -o fs/iso.o fs/iso.c
make -C lib libaboot.a CPPFLAGS=" -U_FORTIFY_SOURCE -Iinclude" TESTING=""
make[1]: Entering directory '/local_scratch/glaubitz/aboot/lib'
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -Os -Wall -mno-fp-regs -ffreestanding -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include  -c -o vsprintf.o vsprintf.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -Os -Wall -mno-fp-regs -ffreestanding -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include  -c -o memcpy.o memcpy.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -Os -Wall -mno-fp-regs -ffreestanding -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include  -c -o memset.o memset.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -Os -Wall -mno-fp-regs -ffreestanding -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include  -c -o string.o string.c
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include -D__ASSEMBLY__ -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include  -c -o _setjmp.o _setjmp.S
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include -D__ASSEMBLY__ -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include  -c -o _longjmp.o _longjmp.S
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -Os -Wall -mno-fp-regs -ffreestanding -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -I../include  -c -o isolib.o isolib.c
alpha-linux-gnu-gcc -DDIV -c -o __divqu.o divide.S
alpha-linux-gnu-gcc -DREM -c -o __remqu.o divide.S
alpha-linux-gnu-gcc -DDIV -DINTSIZE -c -o __divlu.o divide.S
alpha-linux-gnu-gcc -DREM -DINTSIZE -c -o __remlu.o divide.S
ar cru libaboot.a vsprintf.o memcpy.o memset.o string.o _setjmp.o _longjmp.o isolib.o __divqu.o __remqu.o __divlu.o __remlu.o
ar: `u' modifier ignored since `D' is the default (see `U')
make[1]: Leaving directory '/local_scratch/glaubitz/aboot/lib'
alpha-linux-gnu-ld -static -N -Taboot.lds --relax head.o aboot.o cons.o utils.o zip/misc.o zip/unzip.o zip/inflate.o disk.o fs/ext2.o fs/ufs.o fs/dummy.o fs/iso.o -o aboot lib/libaboot.a
alpha-linux-gnu-ld: warning: __remlu.o: missing .note.GNU-stack section implies executable stack
alpha-linux-gnu-ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker
alpha-linux-gnu-ld: warning: aboot has a LOAD segment with RWX permissions
make -C tools objstrip CPPFLAGS=" -U_FORTIFY_SOURCE -Iinclude"
make[1]: Entering directory '/local_scratch/glaubitz/aboot/tools'
alpha-linux-gnu-gcc  -U_FORTIFY_SOURCE -Iinclude -Os -Wall -ffreestanding -mno-fp-regs -msmall-data -msmall-text -g -O2 -Wall -I. -I../include -U_FORTIFY_SOURCE -Iinclude -U_FORTIFY_SOURCE -Iinclude   objstrip.c   -o objstrip
make[1]: Leaving directory '/local_scratch/glaubitz/aboot/tools'
tools/objstrip -vb aboot bootlx
qemu-alpha-static: /lib/ld-linux.so.2: Invalid ELF image for this architecture
make: *** [Makefile:90: bootlx] Error 255
glaubitz@nofan:..glaubitz/aboot>

The build process should probably be modified so that objstrip is always built natively so that it can be run even for cross-builds. Unfortunately, objstrip currently does not build on x86_64, so that would have to be addressed first.