On 2021-10-10 09:17, Ronaldo Luiz Alonso via Cygwin wrote:
Hello everybody!
I am a professor teaching operational system and using a tutorial in
french by michelizza:
https://michelizza.developpez.com/realiser-son-propre-systeme/
In order to build the system and debug it in bochs I use the
following Makefile:
------------------------------------------------------------------------
OBJ=kernel
CC=gcc -Wall *-m32* -g
all: $(OBJ)
kernel: kernel.o screen.o lib.o gdt.o idt.o interrupt.o int.o pic.o
syscalls.o mm.o printk.o process.o schedule.o sched.o
* ld --oformat binary -m elf_i386 -Ttext 1000 $^ -o $@*
int.o: int.asm
nasm -f elf -o $@ $^
sched.o: sched.asm
nasm -f elf -o $@ $^
.o: .c
$(CC) -c $^
clean:
rm -f $(OBJ) *.o
------------------------------------------------------------------------
Note that the system is compiled using -m 32 (system is for machines with
32 bits) bits and the linker uses elf_i386 multiboot format.
This was working fine few weeks later, but when I run setup again to update
cygwin it stops working and ld complains that* this emulation mode is no
longer supported! *
The system now only links and builds PE windows executables!
The question is:
*how can I get and build an older version of ld source, so that this works
again in cygwin ?*
*Is it possible?*
*or should I give up developping this kernel using windows and cygwin and
turn back to Linux?*
$ ld --help | egrep 'elf|386'
ld: supported targets: pe-x86-64 pei-x86-64 pe-bigobj-x86-64
elf64-x86-64 elf64-l1om elf64-k1om pe-i386 pei-i386 elf32-i386
elf32-iamcu elf64-little elf64-big elf32-little elf32-big srec
symbolsrec verilog tekhex binary ihex plugin
ld: supported emulations: i386pep i386pe
i386pep:
i386pe:
Package binutils ld still supports elf32-i386 but not emulation.
For now you can still roll back to 2.36 and see if that supports the
target and emulation you are using; you may also have to roll back its
dependencies:
depends2: cygwin, libintl8, zlib0
You can also still download the earlier Cygwin source package and
maintain that as an effective fork.
Older source package build control script definitions and patches are
available under:
https://cygwin.com/git-cygwin-packages/?p=git/cygwin-packages/binutils.git
and you may need earlier releases of build tools:
build-depends: cygport, dejagnu, libgmp-devel, libiconv-devel,
libintl-devel, libisl-devel, libmpc-devel, libmpfr-devel, zlib-devel
Older Cygwin Setup and package releases remain available at the Cygwin
Time Machine:
http://www.crouchingtigerhiddenfruitbat.org/Cygwin/timemachine.html
As Cygwin is a rolling release system, you need to pay attention to
announcement notices of test and stable releases of packages on which
your work depends.
New bug fix releases can quickly roll somewhat older releases out of the
available archives.
--
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada
This email may be disturbing to some readers as it contains
too much technical detail. Reader discretion is advised.
[Data in binary units and prefixes, physical quantities in SI.]
--
Problem reports: https://cygwin.com/problems.html
FAQ: https://cygwin.com/faq/
Documentation: https://cygwin.com/docs.html
Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
