The github-repo https://github.com/LowLevelMahn/build_clfs_tools
contains the scripts, files AND complete build-logs (so no need to run
the script yourself)
separated for each step that i will use here as a "walkable" reference.
The Repo Readme.MD better read/clickable then this long email. I'll try
to keep the github readme.md up to date if somethings changes.
===================
Goal
===================
I want to add alpha dec support to the current stable Cross Linux From
Scratch (CLFS clfs.org) 3.0 (which uses gcc 4.8.3 as source base)
CLFS 3.0 currently only supports x86/mips/sparc/arm/powerpc.
Using a ready-for-use-cross-development-toolkit is not an option for
being CLFS conform.
===================
Work so far - the build-script
===================
I’ve written a bash script
https://github.com/LowLevelMahn/build_clfs_tools/blob/master/build_clfs_cross_tools.sh
(for being consistent in building for the different targets)
that is doing the CLFS "5. Constructing Cross-Compile Tools" chapter.
Its based on
http://www.clfs.org/view/CLFS-3.0.0-SYSTEMD/sparc64-64/cross-tools/introduction.html
and
http://www.clfs.org/view/CLFS-3.0.0-SYSTEMD/mips64-64/cross-tools/introduction.html
I've got extra follow up scripts for building kernel, bash, hello world
etc. but I haven't included them here to keep the problem report smaller.
The script needs sudo to add /tools and /cross-tools symbolic links to
the root - the CLFS gcc patches are directing to them - but thats all
The script checks for every possible error and exits with current
step/substep info on any fail, it logs every ./configure, make, make
install run
and creates some extra info files for searchdirs, paths etc.
Every package is built out of Source-Tree and freshly extracted/removed
in every step.
The target configuration (build script line 35-70) is the only part of
the script which is target specific.
The rest of the script only uses these variables, no target related
ifs/switch-cases while configuring/building are present.
This is the essence of the script:
step(04) starting at line 299 in the build script
* step( 4): 5.2. File-5.19
* step( 5): 5.3. Linux-3.14.21 Headers
* step( 6): 5.4. M4-1.4.17
* step( 7): 5.5. Ncurses-5.9
* step( 8): 5.6. Pkg-config-lite-0.28-1
* step( 9): 5.7. GMP-6.0.0
* step(10): 5.8. MPFR-3.1.2
* step(11): 5.9. MPC-1.0.2
* step(12): 5.10. ISL-0.12.2
* step(13): 5.11. CLooG-0.18.2
* step(14): 5.12. Cross Binutils-2.24
* step(15): 5.13. Cross GCC-4.8.3
* step(16): 5.14. Glibc-2.19
* step(17): 5.15. Cross GCC-4.8.3 <-- alpha fails here
build-logs:
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/alpha/build_log
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/mips64-64/build_log
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/sparc64-64/build_log
===================
what is working:
===================
Sparc64-64 and mips64-64 are working perfectly - I’m able to compile and
run a linux kernel + bash + hello-world in sparc64/mips64-qemu
based on the built cross-tools.
===================
the problem:
===================
If building for alpha target the script fails in step(17) with linking
crti.o
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/alpha/build_log/step_17_gcc-4.8.3/make.out
in line 3776
===================
My findings so far:
===================
The reason for the fail in step(17) is that the built gcc in step(15)
got the wrong gcc search-dirs, whereas
sparc64-64/mips64-64 got the correct and equal gcc-search-dirs, but the
alpha target differs in the last 4 paths.
Logged gcc search-dirs:
gcc_search_dirs.(diffable).out is generated in step(15) Cross GCC-4.8.3,
build_clfs_cross_tools.sh, line: 723/726
better readable search-dirs
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/alpha/build_log/step_15_gcc-4.8.3/gcc_search_dirs.out
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/mips64-64/build_log/step_15_gcc-4.8.3/gcc_search_dirs.out
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/sparc64-64/build_log/step_15_gcc-4.8.3/gcc_search_dirs.out
for being better diffable target replaced by {TARGET}, clfs_target
replace by [CLFS_TARGET} etc.
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/alpha/build_log/step_15_gcc-4.8.3/gcc_search_dirs.diffable.out
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/mips64-64/build_log/step_15_gcc-4.8.3/gcc_search_dirs.diffable.out
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/sparc64-64/build_log/step_15_gcc-4.8.3/gcc_search_dirs.diffable.out
logged c-runtime location:
-the crti.o is the same in all target-folders - that seems correct
crt-path.out is generated in step(16) Glibc-2.19,
build_clfs_cross_tools.sh, line: 776
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/alpha/build_log/step_16_glibc-2.19/crt-path.out
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/mips64-64/build_log/step_16_glibc-2.19/crt-path.out
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/sparc64-64/build_log/step_16_glibc-2.19/crt-path.out
logged ld SEARCHDIR:
the ld searchpath is the same "/tools/lib" for all targets - that seems
correct
ld_SEARCHDIR.out is generated in step(14) Cross Binutils-2.24,
build_clfs_cross_tools.sh, line: 626
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/alpha/build_log/step_14_binutils-2.24/ld_SEARCHDIR.out
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/mips64-64/build_log/step_14_binutils-2.24/ld_SEARCHDIR.out
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/system/sparc64-64/build_log/step_14_binutils-2.24/ld_SEARCHDIR.out
the configure/make differences between the targets:
the mips64/sparc64/alpha Makefile/config.(status|log) for step(15) Cross
GCC-4.8.3 are nearly equal for the targets
and it doesn't seem that the gcc-search-dirs difference comes from here
see folder
https://github.com/LowLevelMahn/build_clfs_tools/step15_build_configure_logs_diffable
for being better diffable the target replaced by {TARGET}, the
clfs_target replace by [CLFS_TARGET} etc. so its easier to diff localy
with the prefered tool
===================
My suspicions so far :
===================
First idea: The also alpha targeting (but not supported) CLFS gcc
patching does not "change" enough for alpha
https://github.com/LowLevelMahn/build_clfs_tools/tree/master/clfs_cross_tools/files/gcc-4.8.3-pure64_specs-1.patch
in step(15) Cross GCC-4.8.3, build_clfs_cross_tools.sh
1. line 680: patch -Np1 -i "${FILES}/gcc-4.8.3-pure64_specs-1.patch"
2. line 683: echo -en '/n#undef STANDARD_STARTFILE_PREFIX_1/n#define
STANDARD_STARTFILE_PREFIX_1 "/tools/lib/"/n' >> gcc/config/linux.h
3. line 685: echo -en '/n#undef STANDARD_STARTFILE_PREFIX_2/n#define
STANDARD_STARTFILE_PREFIX_2 ""/n' >> gcc/config/linux.h
The patching only changes files in /gcc/config
I've copyied the original and patched /gcc/config tree into the
https://github.com/LowLevelMahn/build_clfs_tools/gcc-4.8.3.patch.files
folder - so its easier to diff localy with the prefered tool
Second and better idea:
i think gcc ./configure does not treat the parameters
--prefix=/cross-tools and --with-local-prefix=/tools in step(15) Cross
GCC-4.8.3, the same way for alpha as for mips/sparc targets
because the CLFS gcc patch does not patch /cross-tools into the sources
at all so /cross-tools from the gcc-search-dirs must come through gcc
configure parameters - but are just partialy missing with target alpha
so mips/sparc respecting --prefix=/cross-tools, but alpha only partialy
- seems to be a bug in gcc/configuration
===================
Any idea/hint where/how to find/correct the gcc-search-dirs differences
for the alpha target to be CLFS conform and buildable?
Thanks,
Dennis
