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Grub 2.06 fails to install boot loader #23

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dslm4515 opened this issue Jul 5, 2021 · 46 comments
Open

Grub 2.06 fails to install boot loader #23

dslm4515 opened this issue Jul 5, 2021 · 46 comments
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@dslm4515
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dslm4515 commented Jul 5, 2021

Grub builds fine under chroot. When it is time to use grub-install to install grub as boot loader, install fails as diskboot.img is too large at 129Mb. Correct size is 512 Kb.

Replacing image (with correct size) from an older build, install progresses but fails again with boot.img too large at 535 Kb instead of 512 Kb.

Replace boot.img from an older build (with correct size) and now install succeeds.

@dslm4515 dslm4515 self-assigned this Jul 5, 2021
@dslm4515 dslm4515 added invalid This doesn't seem right bug Something isn't working labels Jul 5, 2021
@andzai1995
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It looks like a bug appeared after release of binutils 2.36.1. See https://www.linuxfromscratch.org/lfs/view/stable/chapter08/grub.html , maybe the fix of issue in the beginning of this step will be useful.

@dslm4515
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dslm4515 commented Jul 5, 2021

I'll try that and check the those images

@andzai1995
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I'll try that and check the those images

Try to use binutils LD instead of LLVM ld.lld if images wouldn't be correct

@dslm4515
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dslm4515 commented Jul 5, 2021

Try to use binutils LD instead of LLVM ld.lld if images wouldn't be correct

Good point. I haven't tried that. Will do first

@andzai1995
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Try to use binutils LD instead of LLVM ld.lld if images wouldn't be correct

Good point. I haven't tried that. Will do first

Fix an issue with binutils first, if you would do this.

@dslm4515
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dslm4515 commented Jul 5, 2021

Prefixing configure with CC=gcc.gnu CXX=g++.gnu AR=llvm-ar AS=llvm-as yielded the same wrong file sizes

@dslm4515
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dslm4515 commented Jul 5, 2021

I also tried compiling with ld.bfd (binutils) and same issue.

I'll try a patch for binutils

@andzai1995
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andzai1995 commented Jul 5, 2021

Prefixing configure with CC=gcc.gnu CXX=g++.gnu AR=llvm-ar AS=llvm-as yielded the same wrong file sizes

Well, we have to use dear old GCC+Binutils toolchain for GRUB2 again. At least, we tried another way. I just needed to recognize if this error appears again. GRUB 2.06 release promised that it could be built correctly with clang 10. We tried clang 12. It failed. For now, at least.
P.S. When I will build grub 2.06, I will tell you how I would have been built it and what kind of errors I have got.

@dslm4515
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dslm4515 commented Jul 5, 2021

My current CMLFS build is llvm12 with binutils and GCC in /usr. I suffixed GCC binaries with .gnu and made links to Clang.

So I tried LLVM12, LLVM12+Binutils,GCC+LLVM12-binary-tools... I think I forgot to try GCC+binutils.

@dslm4515
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dslm4515 commented Jul 5, 2021

Oops. I did: GCC+binutils also generated wrong files sizes.

@dslm4515
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dslm4515 commented Jul 5, 2021

I forgot to mention, building grub with clang as compiler...it yields an error when configuring:

none of __bb_start, edata, or _edata is defined [by the compiler]

@andzai1995
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Oops. I did: GCC+binutils also generated wrong files sizes.

My progress in building of final system is 34-flex for now. But I have found very small mistake on this step. HELPMAN equals to /tools/bin/true in configure script, but in CMLFS we don't use /tools, do we? We use /llvmtools. And HELPMAN should be equal to /llvmtools/bin/true. When I will build 72-grub, I would tell about that what I would find.

@dslm4515
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dslm4515 commented Jul 6, 2021

I did check Alpine Linux and Void Linux... I didnt see any patches or fixes

@andzai1995
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andzai1995 commented Aug 11, 2021

Well, I have built and installed GRUB 2.06. It builds fine, installation works fine as well. Generation of config fails due to disabled os-prober. I have built my GRUB for BIOS, so you could get bug with EFI.
During the build I used scripts for changing of toolchain mode:

/llvmtools/bin/set-gcc-mode
/llvmtools/bin/set-gnu-bin-mode
/usr/bin/set-gnu-bin-mode
/usr/bin/set-gcc-mode

and used fix of issue from LFS grub 2.04 built recipe placed after applying of patches and before executing of autogen.sh:

sed "s/gold-version/& -R .note.gnu.property/" \
    -i Makefile.in grub-core/Makefile.in

Снимок экрана от 2021-08-11 21-00-09

Снимок экрана от 2021-08-11 21-11-25

At the very first time, when I used current way configure decided that gcc could not produce executables, so I decided to make a new gcc. But when I switched to gnu toolchain and begin building of new gcc, I decided to stop this madness and build GRUB. GRUB built fine, but os-prober doesn't work.
When I tried to use clang toolchain, configure fails due to absense of some symbols in compiler. GRUB 2.06 should build with clang, but doesn't do it.

@dslm4515
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Hmmm... I am working another project using MLFS as base and using optimizations from Clear Linux. I just finished building GCC (version 11.2.0!) and binutils (version 2.37) for the final system. I will see when I get to GRUB, if the boot images are still bloated or not.

@andzai1995
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Hmmm... I am working another project using MLFS as base and using optimizations from Clear Linux. I just finished building GCC (version 11.2.0!) and binutils (version 2.37) for the final system. I will see when I get to GRUB, if the boot images are still bloated or not.

Okay. I used binutils 2.37, too. The size of diskboot.img should be 512 bytes, not kbytes, due to the first sector size

@andzai1995
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There is an error when we build GRUB 2.06 with clang:

Снимок экрана от 2021-08-11 21-51-12

@dslm4515
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Yes, i did notice that last time i built grub with clang

@andzai1995
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andzai1995 commented Aug 11, 2021

Yes, i did notice that last time i built grub with clang

I found the way to surpass this error. Create config.cache with cached yes for __bss_start and some others variables:

cat > config.cache << "EOF"
grub_cv_check_uscore_uscore_bss_start_symbol=yes
grub_cv_check_edata_symbol=yes (should be no)
grub_cv_check_uscore_edata_symbol=yes (should be no)
grub_cv_check_end_symbol=yes
grub_cv_check_uscore_end_symbol=yes (should be no)
EOF

This wouldn't be enough. I will try to build grub 2.06 now.
P.S. Added all of options for config.cache that I used for build of grub-2.06. All of these symbols are present in LLVM LLD, but configure doesn't find it. So we must take one of symbols from _bss_start, edata and _edata, and one of end and _end. But not all of them

@andzai1995
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andzai1995 commented Aug 12, 2021

I have successfully built GRUB 2.06 with clang, installed it to system, and successfully installed bootloader.
Process of build:

  1. Apply patches:
patch -Np1 -i ../patches/grub-alpine/lang-C.UTF-8.patch         && \
patch -Np1 -i ../patches/grub-alpine/fix-gcc-no-pie-specs.patch && \
patch -Np1 -i ../patches/grub-alpine/alpine-mkconfig.patch
  1. Fix issue from Grub installation from LFS 10.1:
sed "s/gold-version/& -R .note.gnu.property/" \
    -i Makefile.in grub-core/Makefile.in
  1. Re-generate Configure script:
PYTHON=python3 ./autogen.sh
  1. Create config.cache for surpassing broken tests of symbols __bss_start, edata, _edata, end, _end. I put there that symbols that I used during the build. You can try all yes variant, but if you do so, compilation may fail when compilator will detect include/grub/symbol.h due to that fact it could not define HAVE_ASM_USCORE, which should be defined with __bss_start, edata or _edata symbol (all of them are defined in LLD since 2017):
cat > config.cache << "EOF"
grub_cv_check_uscore_uscore_bss_start_symbol=yes
grub_cv_check_edata_symbol=yes
grub_cv_check_uscore_edata_symbol=no
grub_cv_check_end_symbol=yes
grub_cv_check_uscore_end_symbol=no
EOF
  1. Configure GRUB 2.06 for compilation. Due to the fact my PC is very old and uses BIOS, I don't need EFI. Also, I tried to use x86_64-pc-musl-linux as target:
CC=clang CXX=clang++ \
CFLAGS="-Wno-error" \
./configure --prefix=/usr          \
            --target=x86_64-pc-linux-musl        \
            --sbindir=/sbin        \
            --sysconfdir=/etc      \
            --disable-efiemu       \
            --disable-werror       \
            --cache-file=config.cache
  1. Modify project root Makefile and grub-core/Makefile and add --no-pie option to LDFLAGS_MODULE, LDFLAGS_IMAGE, TARGET_IMG_LDFLAGS and TARGET_LDFLAGS_OLDMAGIC. -r linker option must be added to LDFLAGS_IMAGE as well, otherwise you will get bloated images:
    LDFLAGS_MODULE and LDFLAGS_IMAGE were:
...
CFLAGS_MODULE = $(CFLAGS_PLATFORM) -ffreestanding
LDFLAGS_MODULE = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC) -Wl,-r,-d
CPPFLAGS_MODULE = $(CPPFLAGS_CPU) $(CPPFLAGS_PLATFORM)
CCASFLAGS_MODULE = $(CCASFLAGS_CPU) $(CCASFLAGS_PLATFORM)
CFLAGS_IMAGE = $(CFLAGS_PLATFORM) -fno-builtin
LDFLAGS_IMAGE = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC) -Wl,-S
CPPFLAGS_IMAGE = $(CPPFLAGS_CPU) $(CPPFLAGS_PLATFORM)
...

And become:

...
CFLAGS_MODULE = $(CFLAGS_PLATFORM) -ffreestanding
LDFLAGS_MODULE = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC) -Wl,-r,--no-pie,-d
CPPFLAGS_MODULE = $(CPPFLAGS_CPU) $(CPPFLAGS_PLATFORM)
CCASFLAGS_MODULE = $(CCASFLAGS_CPU) $(CCASFLAGS_PLATFORM)
CFLAGS_IMAGE = $(CFLAGS_PLATFORM) -fno-builtin
LDFLAGS_IMAGE = $(LDFLAGS_PLATFORM) -nostdlib $(TARGET_LDFLAGS_OLDMAGIC) -Wl,-r,--no-pie,-S
CPPFLAGS_IMAGE = $(CPPFLAGS_CPU) $(CPPFLAGS_PLATFORM)
...

TARGET_IMG_LDFLAGS and TARGET_LDFLAGS_OLDMAGIC were:

...
TARGET_IMG_CFLAGS =
TARGET_IMG_LDFLAGS = -Wl,-N
TARGET_LDFLAGS =  -m32 -Wl,-melf_i386 -Wl,--build-id=none
TARGET_LDFLAGS_OLDMAGIC = -Wl,-N
TARGET_LINK_ADDR =
...

and become:

...
TARGET_IMG_CFLAGS =
TARGET_IMG_LDFLAGS = -Wl,-N,--no-pie
TARGET_LDFLAGS =  -m32 -Wl,-melf_i386 -Wl,--build-id=none
TARGET_LDFLAGS_OLDMAGIC = -Wl,-N,--no-pie
TARGET_LINK_ADDR =
...
  1. Make project.
make
  1. Check size of grub-core/*.img:
    Снимок экрана от 2021-08-12 13-16-37

  2. If size of *.img are correct, you can install grub:

make install
  1. Install grub to mbr:
    Снимок экрана от 2021-08-12 13-14-46

P.S. That's why you must add -r to LDFLAGS_IMAGE:
Снимок экрана от 2021-08-12 14-11-38

@andzai1995
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andzai1995 commented Aug 12, 2021

Well, clang-built grub doesn't work. Maybe because of e2fsprogs isn't installed

@andzai1995
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Every of these .img files has additional 23 bytes. For what reason they were added?

@andzai1995
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andzai1995 commented Aug 13, 2021

Well, I found the сause of bloated images. This is linker. When we use ld.lld, it gives 23 additional bytes to each *.img and bloats them. I have found it when I forgot to change link /usr/bin/ld from ld.lld to ld.bfd and built grub with GCC. All of *.img files were bloated.

@dslm4515
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So if GRUB was built with ld.bfd, no bloat?

@andzai1995
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andzai1995 commented Aug 13, 2021

So if GRUB was built with ld.bfd, no bloat?

Yes.

@andzai1995
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So if GRUB was built with ld.bfd, no bloat?

I have tried to reboot with clang-built grub and gcc-built images. Image loaded well, I've got "Welcome to GRUB!", but after that I have got black screen. Therefore, modules must be gcc-built as well. I will try to build grub 2.06 with clang and ld.bfd. And after that I will report about results.

@andzai1995
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Well, I have copied all of *.img, *.module and *.mod files from gcc-built grub to clang-built grub. After reinstallation of grub in mbr, I successfully logged in my ubuntu 21.04 via CMLFS GRUB. I did not try build with clang and ld.bfd for now. I will do this now.

@dslm4515
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I cannot remember if i was able to build GRUB with Clang+LLD and just copied the [unbloated] boot images from an older build (from MLFS). Or if I had to build GRUB with GCC+Binutils with unbloated images from an old MLFS build

@andzai1995
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I cannot remember if i was able to build GRUB with Clang+LLD and just copied the [unbloated] boot images from an older build (from MLFS). Or if I had to build GRUB with GCC+Binutils with unbloated images from an old MLFS build

Make two builds: one built with clang, one built with gcc. All .img, .module and .mod files in clang will be broken. Copy these file from gcc build and it will work

@dslm4515
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Make two builds: one built with clang, one built with gcc. All .img, .module and .mod files in clang will be broken. Copy these file from gcc build and it will work

Most likely I will update the built and use that method.

@dslm4515 dslm4515 added this to To do in Goals & Features Aug 13, 2021
@andzai1995
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andzai1995 commented Aug 13, 2021

So if GRUB was built with ld.bfd, no bloat?

I have just built and installed clang+ld.bfd built GRUB 2.06. It works.
Снимок экрана от 2021-08-13 23-19-21
Снимок экрана от 2021-08-13 23-31-57

@andzai1995
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andzai1995 commented Aug 13, 2021

072-grub recipe should be:

# Final System: Grub
# Source: https://ftp.gnu.org/gnu/grub/grub-2.06.tar.xz
# This section is done in Chroot environment

# Grub has to be compiled with GCC and binutils, not LLVM - Ha! Nu tupye

# Remove ld link to ld.lld and change it ld.bfd
rm -v /usr/bin/ld
ln -svf ld.bfd /usr/bin/ld

# Apply fixes
patch -Np1 -i ../patches/grub-alpine/lang-C.UTF-8.patch         && \
patch -Np1 -i ../patches/grub-alpine/fix-gcc-no-pie-specs.patch && \
patch -Np1 -i ../patches/grub-alpine/alpine-mkconfig.patch

# Fix issue
sed "s/gold-version/& -R .note.gnu.property/" \
    -i Makefile.in grub-core/Makefile.in

# Re-Generate configure script
PYTHON=python3 ./autogen.sh

# Create config.cache:
cat > config.cache << "EOF"
grub_cv_check_uscore_uscore_bss_start_symbol=yes
grub_cv_check_edata_symbol=yes
grub_cv_check_uscore_edata_symbol=no
grub_cv_check_end_symbol=yes
grub_cv_check_uscore_end_symbol=no
EOF

# for BIOS-based PCs:
CC=clang \
CXX=clang++ \
CFLAGS="-Wno-error --ld-path=/usr/bin/ld.bfd" \
CXXFLAGS="--ld-path=/usr/bin/ld.bfd" \
LD=ld.bfd \
./configure --prefix=/usr          \
            --sbindir=/sbin        \
            --sysconfdir=/etc      \
            --disable-efiemu       \
            --disable-werror       \
            --cache-file=config.cache

# for UEFI-based PCs:
# Configure scripts expect x86_64-gcc.

# Now configure
CC=clang \
CXX=clang++ \
CFLAGS="-Wno-error --ld-path=/usr/bin/ld.bfd" \
CXXFLAGS="--ld-path=/usr/bin/ld.bfd" \
LD=ld.bfd \
./configure --prefix=/usr          \
            --target=x86_64        \
            --with-platform=efi    \
            --sbindir=/sbin        \
            --sysconfdir=/etc      \
            --disable-werror       \
            --cache-file=config.cache

# Modify project root Makefile and grub-core Makefile
sed -i 's/TARGET_IMG_LDFLAGS = -Wl,-N/TARGET_IMG_LDFLAGS = -Wl,-N,--no-pie/' Makefile
sed -i 's/TARGET_LDFLAGS_OLDMAGIC = -Wl,-N/TARGET_LDFLAGS_OLDMAGIC = -Wl,-N,--no-pie/' Makefile
sed -i 's/TARGET_IMG_LDFLAGS = -Wl,-N/TARGET_IMG_LDFLAGS = -Wl,-N,--no-pie/' grub-core/Makefile
sed -i 's/TARGET_LDFLAGS_OLDMAGIC = -Wl,-N/TARGET_LDFLAGS_OLDMAGIC = -Wl,-N,--no-pie/' grub-core/Makefile

# Make & install grub
make
make install

# Restore old linker
rm /usr/bin/ld
ln -svf ld.lld /usr/bin/ld

Check if I am right or not.

@andzai1995
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andzai1995 commented Aug 17, 2021

ld.gold can also be used as linker for correct build of grub. All of images are unbloated. kernel.img is bigger than built with ld.bfd, but other *.img files have the same sizes like they was built with ld.bfd.
Снимок экрана от 2021-08-17 18-51-25

@andzai1995
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andzai1995 commented Aug 17, 2021

ld.gold can also be used as linker for correct build of grub. All of images are unbloated. kernel.img is bigger than built with ld.bfd, but other *.img files have the same sizes like they was built with ld.bfd.
Снимок экрана от 2021-08-17 18-51-25

Oops. I have got error with ld.gold.
Снимок экрана от 2021-08-17 19-18-10

ld.bfd must be appropriated.

@dslm4515
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So in short, GRUB still needs to be built with GCC + Binutils's ld.bfd, right?

Would be nice to clang-build GRUB but then use GCC+ld.bfd for the boot images.

@andzai1995
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So in short, GRUB still needs to be built with GCC + Binutils's ld.bfd, right?

Would be nice to clang-build GRUB but then use GCC+ld.bfd for the boot images.

In short, you should use clang+ld.bfd.

@takusuman
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I think that besides GRUB being ubiquitous in modern UNIX, it would be interesting to have an alternative too for ones who don't want to make workarounds.
I know LILO/ELILO, but there's little to nothing documentation on how to cross-build them on a musl chroot.

@dslm4515
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dslm4515 commented Feb 3, 2023

@andzai1995

In short, you should use clang+ld.bfd.

Chimera Linux uses clang, libc++, LLD, and compiler-rt as defaults like CMLFS. So I checked how grub is compiled via their cports repo.

Looks like grub is built with LLVM without binutils! There are patches, so I will try and see

@dslm4515
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dslm4515 commented Feb 3, 2023

Even with patches from Chimera linux, configure tests for symbols __bss_start, edata, _edata, end, _end still fail. Therefore a config.cache has to be used as mentioned earlier:

cat > config.cache << "EOF"
grub_cv_check_uscore_uscore_bss_start_symbol=yes
grub_cv_check_edata_symbol=yes
grub_cv_check_uscore_edata_symbol=no
grub_cv_check_end_symbol=yes
grub_cv_check_uscore_end_symbol=no
EOF

Configure script executes with no errors. But when compiling, build breaks. To get the build to compile, modify the makefiles, as mentioned before, right after running configure:

sed -i 's/TARGET_IMG_LDFLAGS = -Wl,-N/TARGET_IMG_LDFLAGS = -Wl,-N,--no-pie/' Makefile
sed -i 's/TARGET_LDFLAGS_OLDMAGIC = -Wl,-N/TARGET_LDFLAGS_OLDMAGIC = -Wl,-N,--no-pie/' Makefile
sed -i 's/TARGET_IMG_LDFLAGS = -Wl,-N/TARGET_IMG_LDFLAGS = -Wl,-N,--no-pie/' grub-core/Makefile
sed -i 's/TARGET_LDFLAGS_OLDMAGIC = -Wl,-N/TARGET_LDFLAGS_OLDMAGIC = -Wl,-N,--no-pie/' grub-core/Makefile

Build completes without error. For the i386-pc build, the images look fine. Not exactly the same size as mentioned earlier:

 $ ls -l /BUILD/usr/lib/grub/i386-pc/*.img
-rw-r--r-- 1 root root   512 Feb  2 21:59 /BUILD/usr/lib/grub/i386-pc/boot.img
-rw-r--r-- 1 root root   512 Feb  2 21:59 /BUILD/usr/lib/grub/i386-pc/boot_hybrid.img
-rw-r--r-- 1 root root  2048 Feb  2 21:59 /BUILD/usr/lib/grub/i386-pc/cdboot.img
-rw-r--r-- 1 root root   512 Feb  2 21:59 /BUILD/usr/lib/grub/i386-pc/diskboot.img
-rw-r--r-- 1 root root 34976 Feb  2 21:59 /BUILD/usr/lib/grub/i386-pc/kernel.img
-rw-r--r-- 1 root root  1024 Feb  2 21:59 /BUILD/usr/lib/grub/i386-pc/lnxboot.img
-rw-r--r-- 1 root root  3472 Feb  2 21:59 /BUILD/usr/lib/grub/i386-pc/lzma_decompress.img
-rw-r--r-- 1 root root  1024 Feb  2 21:59 /BUILD/usr/lib/grub/i386-pc/pxeboot.img

This was built using LLVM-15.0.6 without binutils... clang+LLD

@andzai1995
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So, with patches from Chimera Linux, you don't have any bloats anymore?
That's wonderful.
You can make pull request. Modify recipe, it can be used for the project

@andzai1995
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andzai1995 commented Feb 3, 2023

Did you check work capability of brand new images? If not, you should check their capability for correct work

@dslm4515
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dslm4515 commented Feb 3, 2023

You can make pull request. Modify recipe, it can be used for the project

It's actually a local commit that I havent uploaded yet for the bsd-userland branch

Did you check work capability of brand new images? If not, you should check its capability

I'm almost done with my build. I got a small BIOS-based PC i can test on.

@andzai1995
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andzai1995 commented Feb 3, 2023

OK, good luck with checking!

@dslm4515
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dslm4515 commented Feb 7, 2023

So far grub-install /dev/sda reports no errors!

Next, let's boot with grub...

Edit: Yes! Boots grub!

@dslm4515 dslm4515 closed this as completed Feb 8, 2023
@dslm4515
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Clang+elftoolchain cannot build grub:

grub_script.yy.c:1077:35: error: expected ';' after expression
                                if ( yy_current_state >= 188 )
                                                              ^
                                                              ;
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make[2]: *** [Makefile:8095: libgrubmods_a-grub_script.yy.o] Error 1
make[2]: Leaving directory '/sources/grub-2.06'
make[1]: *** [Makefile:11514: all-recursive] Error 1
make[1]: Leaving directory '/sources/grub-2.06'
make: *** [Makefile:3372: all] Error 2

Do note, my CMLFS build does not have bison... i replaced it with byacc.

I will attempt it again with bison installed

@dslm4515 dslm4515 reopened this May 11, 2023
@dslm4515
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If I build bison and install it in /opt/gnu and add /opt/gnu/bin to path, LLVM+elftools+bison compile GRUB without errors!

Next, lets see if it GRUB can boot...

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