Comments (7)
dvdfreitag
commented on June 12, 2024
1
On further investigation, it seems this is the issue, from CMLFS/3-chroot/008-Adjust_Toolchain:
echo " --sysroot=/usr -Wl,-dynamic-linker /lib/ld-musl-$(uname -m).so.1" > \
/llvmtools/bin/$(uname -m)-cmlfs-linux-musl.cfg
Here we are manually instructing clang to always insert -dynamic-linker, but clang can already build working dynamic libraries with the correct Interpreter:
# echo "int main(){}" > t.c
# clang -o t t.c --verbose -Wl,--verbose
"/llvmtools/bin/clang-12" -cc1 -triple x86_64-pc-linux-musl -emit-obj -mrelax-all --mrelax-relocations -disable-free -disable-llvm-verifier -discard-value-names -main-file-name t.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -v -resource-dir /llvmtools/lib/clang/12.0.0 -isysroot /llvmtools -internal-isystem /llvmtools/usr/local/include -internal-externc-isystem /llvmtools/include -internal-externc-isystem /llvmtools/usr/include -internal-isystem /llvmtools/lib/clang/12.0.0/include -fdebug-compilation-dir /sources/src/utmps-system/temp -ferror-limit 19 -fgnuc-version=4.2.1 -fcolor-diagnostics -faddrsig -o /tmp/t-edcaf0.o -x c t.c
# file t
t: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-musl-x86_64.so.1, not stripped
If I remove the -dynamic-linker section from the config file,
echo " --sysroot=/usr" > /llvmtools/bin/$(uname -m)-cmlfs-linux-musl.cfg
And rebuild:
# x86_64-cmlfs-linux-musl-clang -o t t.c --verbose -Wl,--verbose
Configuration file: /llvmtools/bin/x86_64-cmlfs-linux-musl.cfg
"/llvmtools/bin/clang-12" -cc1 -triple x86_64-cmlfs-linux-musl -emit-obj -mrelax-all --mrelax-relocations -disable-free -disable-llvm-verifier -discard-value-names -main-file-name t.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -tune-cpu generic -fno-split-dwarf-inlining -debugger-tuning=gdb -v -resource-dir /llvmtools/lib/clang/12.0.0 -isysroot /usr -internal-isystem /usr/usr/local/include -internal-externc-isystem /usr/include -internal-externc-isystem /usr/usr/include -internal-isystem /llvmtools/lib/clang/12.0.0/include -fdebug-compilation-dir /sources/src/utmps-system/temp -ferror-limit 19 -fgnuc-version=4.2.1 -fcolor-diagnostics -faddrsig -o /tmp/t-9e1d1a.o -x c t.c
# file t
t: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-musl-x86_64.so.1, not stripped
Once this change has been made, with CC=x86_64-cmlfs-linux-musl-clang:
# file utmps-utmpd
utmps-utmpd: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, not stripped
# ./utmps-utmpd
utmps-utmpd: fatal: unable to get $IPCREMOTEEUID from environment
utmps succeeds to build, and works without Segmentation Fault
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dslm4515
commented on June 12, 2024
I created CMLFS/3-chroot/008-Adjust_Toolchain because the llvmtools toolchain produced binaries that looked for an interpreter in /llvmtools instead on the final system root.
LLVM docs don't seem to be much help when trying to build sandboxed toolchains.
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dslm4515
commented on June 12, 2024
I had trouble starting up a new build with LLVM-12.x and moved on to LLVM-15.0.5. Of course, there seems to be drastic changes in LLVM source from 12.x to 15.x which required me to rethink the method to cross compile clang.
After many painful days of failure, I got LLVM-15.0.5 to cross compile. By now, stage 1 clang [installed in llvmtools] links all binaries with -dynamic-linker /lib/ld-musl-$(uname -m).so.1 without a config file. So, stage 1 clang only needs to be re-configured to change sysroot from /llvmtools to /usr ... just as you have mentioned above
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dslm4515
commented on June 12, 2024
This has been addressed via commit 0bfc298
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dslm4515
commented on June 12, 2024
commit bc471a8 now recognizes this change
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dslm4515
commented on June 12, 2024
Issue still present.
Stage1 clang outputs compiled code that uses the dynamic linux loader in /llvmtools/lib. After the system libc [musl] is built, then stage1 clang needs to be reconfigured to produce compiled code that uses the dynamic linux loader in /lib
Either I add patchelf to llvmtools to manually patch shared binaries to use the dynamic linux loader in /lib [until the stage2 clang, the final system's compiler is built] OR .... compile stage1 clang twice, one per dynamic loader path.
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dslm4515
commented on June 12, 2024
Stage0 clang now builds the final system's default compiler which by default produces binaries that use the dynamic linker in /lib/ld-musl-$(uname m).so.1 as this change was done with commit 550cf2c
Now when utmps is built [in chroot], the final system's clang builds it with no cfg. Therefore, static binaries are not built with -dynamic-linker.
This change is present on the mussel-bootsrapped branch. Once I confirm this branch can indeed build a usable CMLFS system, I will merge it into master and CMLFS will then be built with mussel.
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Related Issues (20)
- References to `systemctl` during boot HOT 2
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- Broken stage2 (final system) clang+LLVM HOT 3
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- Clarity on CMLFS_TARGET at 1-cgnutools/4-musl HOT 2
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- Unable to Compile Kernel HOT 25
- What are the packages that cannot be build without GCC? HOT 4
- Fail at Stage-0 (1-Mussel) HOT 6
- What is the state of CMLFS methods for cross-compiling? HOT 34
- Patch for musl's utmp.h is incomplete HOT 5
- OpenSSL needs certificates HOT 1
- LLVM-17.0.5: Stage 2 Clang has sysroot set as /llvmtools HOT 11
- Udev [from systemd] wont configure for final system; expects util-linux installed HOT 2
- Mention of `systemd-hwdb` when executing `udevadm` HOT 1
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