I was following the osdev barebones tutorial and successfully created boot.o and linker.ld, but ran into a problem when the i686-elf-gcc compiler didn't create the kernel.o file. It gave no errors. This is what I ran to compile it:
i686-elf-gcc -c kernel.c -o kernel.o -std=gnu99 -ffreestanding -O2 -Wall -Wextra
But no matter how many times I do it, there's still no kernel.o!
Related
My Makefile:
helloworldlib.obj: helloworldlib.cpp
g++ -Wall -o helloworldlib.obj -c helloworldlib.cpp
helloworld.obj: source.cpp
g++ -Wall -o helloworld.obj -c source.cpp
helloworld.exe: source.cpp helloworld.obj
g++ -Wall -o helloworld.exe helloworld.obj helloworldlib.obj
I'm not sure what's wrong with this, when I run mingw32-make it only executes the first g++ -Wall -o helloworldlib.obj -c helloworldlib.cpp.
As far as I know this makefile is syntactically correct, mingw just doesn't seem to be able to find the other lines.
This is how make works. If no target is provided on the command line (e.g. mingw32-make helloworld.exe), by default it builds the first target defined in the file. See for instance: https://stackoverflow.com/a/2057716/2249356.
As a quick fix, you can just move the rule for helloworld.exe to the top of the file and then make will build all.
And, I think that the last rule is supposed to read
helloworld.exe: helloworld.obj helloworldlib.obj
g++ -Wall -o helloworld.exe helloworld.obj helloworldlib.obj
rather then with the source.cpp and its object code helloworld.obj as dependencies.
When I link the .ld file using gcc I got the following error
/usr/bin/ld: cannot find -lreadline
collect2: error: ld returned 1 exit status
my run.sh scripts contains the following command
rm *.o *.bin *.iso
rm -rf isodir
assemble boot.s file
as --32 boot.s -o boot.o
linking the kernel with kernel.o and boot.o files
gcc -m32 -lunistd -Wno-unused-result -c kernelCheck.c -o kernel.o -std=gnu99 -ffreestanding -flto -O2 -Wall -Wextra -L/usr/lib -fno-exceptions
gcc -m32 -T linker.ld -o MoraWing.bin -ffreestanding -Wl,--build-id=none -O2 -nostdlib boot.o kernel.o -lgcc
grub-file --is-x86-multiboot MoraWing.bin
building the iso file
mkdir -p isodir/boot/grub
cp MoraWing.bin isodir/boot/MoraWing.bin
cp grub.cfg isodir/boot/grub/grub.cfg
grub-mkrescue -o MoraWing.iso ./isodir
run it in qemu
qemu-system-x86_64 -cdrom MoraWing.iso
You need to install libreadline-dev, or a similar package suitable for your system (you should also specify what your system is).
I'm trying to compile a c++ program and I am having some issues. In particular, when I use x86_64-w64-mingw32-gcc as my compiler, it complains half way through my compilation saying "tmp/src/libfastms/solver/solver.cpp.o: file not recognized: File format not recognized".
Here is my makefile (not mine, I'm trying to adapt this makefile to a cygwin environment) https://pastebin.com/vgnVYJUL
Here is the console output when I run make:
x86_64-w64-mingw32-gcc -c -o tmp/src/libfastms/solver/solver.cpp.o src/libfastms/solver/solver.cpp -Wall -O3 -m64 -Isrc/libfastms -DDISABLE_OPENMP -DDISABLE_OPENCV -DDISABLE_CUDA
x86_64-w64-mingw32-gcc -c -o tmp/src/libfastms/solver/solver_base.cpp.o src/libfastms/solver/solver_base.cpp -Wall -O3 -m64 -Isrc/libfastms -DDISABLE_OPENMP -DDISABLE_OPENCV -DDISABLE_CUDA
x86_64-w64-mingw32-gcc -c -o tmp/src/libfastms/solver/solver_host.cpp.o src/libfastms/solver/solver_host.cpp -Wall -O3 -m64 -Isrc/libfastms -DDISABLE_OPENMP -DDISABLE_OPENCV -DDISABLE_CUDA
x86_64-w64-mingw32-gcc -c -o tmp/src/libfastms/util/has_cuda.cpp.o src/libfastms/util/has_cuda.cpp -Wall -O3 -m64 -Isrc/libfastms -DDISABLE_OPENMP -DDISABLE_OPENCV -DDISABLE_CUDA
x86_64-w64-mingw32-gcc -c -o tmp/src/libfastms/util/image_mat.cpp.o src/libfastms/util/image_mat.cpp -Wall -O3 -m64 -Isrc/libfastms -DDISABLE_OPENMP -DDISABLE_OPENCV -DDISABLE_CUDA
ld -r -o tmp/src/libfastms/libfastms.o tmp/src/libfastms/solver/solver.cpp.o tmp/src/libfastms/solver/solver_base.cpp.o tmp/src/libfastms/solver/solver_host.cpp.o tmp/src/libfastms/util/has_cuda.cpp.o tmp/src/libfastms/util/image_mat.cpp.o
tmp/src/libfastms/solver/solver.cpp.o: file not recognized: File format not recognized
Makefile:167: recipe for target 'tmp/src/libfastms/libfastms.o' failed
make: *** [tmp/src/libfastms/libfastms.o] Error 1
Some other notes:
I don't have this problem when I compile with g++ (only seems to be minGW)
A common solution to this problem is to clean the directory of residual object files. This does not work.
Another common reason for this is trying to compile .h files. Obviously I am not doing this.
Thanks in advance.
You are compiling your object files with a 64-bit compiler driver, w64-mingw32-gcc,
and with -m64 you are explicitly directing it to generate 64-bit code (unnecessarily,
as that is its default). But you are linking with a 32-bit linker that does not
understand 64-bit object files.
This is happening because in your makefile you are, unusually, invoking ld
explicitly for your incremental solver linkage:
COMMAND_LINK_SOLVER=ld -r -o $# $^
rather than delegating linkage to your compiler driver in the usual way, and
a 32-bit ld from a different toolchain is being found in your PATH before
the 64-bit one belonging to your mingw-w64 toolchain.
To avoid this, invoke the linker via the compiler driver as normal, which for your
solver linkage means:
COMMAND_LINK_SOLVER=$(GXX) -Wl,-r -o $# $^
You can depend on w64-mingw32-gcc to invoke the ld that was installed with it.
There is no need to correct your main linkage as it is already done the right way.
I am new to Squirrel based scripting. Whenever I am trying to compile the program using the GCC compiler. I am getting the following error:
symbol(s) not found for architecture x86_64
I am trying to compile the code on a 64bit mac.
I am new so please excuse me if this is a really dumb question.
To solve the compilation you have to modify the Makefile under SQUIRREL3/sq/ by removing the -s flag from the g++ command.
Example:
sq64:
g++ -O2 -s -m64 -fno-exceptions -fno-rtti -D_SQ64 -o $(OUT) $(SRCS) $(INCZ) $(LIBZ) $(LIB)
becomes:
sq64:
g++ -O2 -m64 -fno-exceptions -fno-rtti -D_SQ64 -o $(OUT) $(SRCS) $(INCZ) $(LIBZ) $(LIB)
Hope it helps.
I am attempting to use Mingw-w64's 32-bit compiler (the i686-w64-mingw32 toolchain) to cross-compile the ICU library for Windows. The host is Ubuntu 12.10 64-bit.
The steps I have taken look something like this:
Grab the latest source code archive from here and extract it.
Make two copies of the source/ directory - one for the host and one for the target.
For the host build:
./configure ; make
For the target build:
./configure --host=i686-w64-mingw32 --with-cross-build=<host_source_dir>
...where <host_source_dir> is the directory from the previous step.
When I run make in the target source directory, compilation proceeds without any errors for a few moments and then throws this error:
i686-w64-mingw32-g++ -O2 -W -Wall -pedantic -Wpointer-arith -Wwrite-strings
-Wno-long-long -mthreads -o ../../bin/uconv.exe uconv.o uwmsg.o
-L../../lib -licuin50 -L../../lib -licuuc50 -L../../stubdata -licudt50
-lm uconvmsg/uconvmsg.a
uconv.o:uconv.cpp:(.text+0x2f): undefined reference to `_uconvmsg_dat'
What could be causing this error? I backed up a few lines and also noticed this:
pkgdata: i686-w64-mingw32-gcc -O2 -Wall -std=c99 -pedantic -Wshadow
-Wpointer-arith -Wmissing-prototypes -Wwrite-strings -mthreads -shared
-Wl,-Bsymbolic -Wl,--enable-auto-import -Wl,--out-implib=./all.lib -o
../lib/icudt50.dll ./out/tmp/icudt50l_dat.o
Cannot export icudt50_dat: symbol not found
collect2: ld returned 1 exit status
-- return status = 256
Error generating library file. Failed command: i686-w64-mingw32-gcc -O2 -Wall
-std=c99 -pedantic -Wshadow -Wpointer-arith -Wmissing-prototypes
-Wwrite-strings -mthreads -shared -Wl,-Bsymbolic -Wl,--enable-auto-import
-Wl,--out-implib=./all.lib -o ../lib/icudt50.dll ./out/tmp/icudt50l_dat.o
Error generating assembly code for data.
What am I doing wrong?
In order to debug your symbol problem just provide the flag -Wl,--trace-symbol=_uconvmsg_dat to i686-w64-mingw32-g++ like follows:
i686-w64-mingw32-g++ -O2 -W -Wall -pedantic -Wpointer-arith -Wwrite-strings
-Wno-long-long -mthreads -o ../../bin/uconv.exe uconv.o uwmsg.o
-L../../lib -licuin50 -L../../lib -licuuc50 -L../../stubdata -licudt50
-lm uconvmsg/uconvmsg.a -Wl,--trace-symbol=_uconvmsg_dat
So it turns out that the problem was indeed with the ICU source code. I'm not sure I understand exactly what the problem is, but thankfully someone else did and wrote three patches.
The first two apply to my question above:
icu4c-50_1_2-crossbuild.patch
icu4c-4_6_1-win32.patch
The third patch is used instead of the second in the list above when building for the x86_64 architecture:
icu4c-4_6_1-win64.patch
There does still seem to be a problem when running make install, but at least the source tree seems to build now.