Dealing with non-ASCII file names in BOOTSTRAP-ORIGIN

[Marius Bakke]

Hi Guix,

I tried switching to GCC 11 on the core-updates branch, but it fails
early when attempting to repack the GCC source code for GCC-BOOT0,
because some files in its test suite contains non-ASCII characters:

--8<---------------cut here---------------start------------->8---
[... unpacking ...]
patching file gcc/builtins.c
Hunk #1 succeeded at 4623 with fuzz 1 (offset 1341 lines).
Hunk #2 succeeded at 6097 with fuzz 2 (offset 2206 lines).
patching file gcc/gimple-fold.c
Hunk #1 succeeded at 665 (offset 9 lines).
Hunk #2 succeeded at 766 with fuzz 2 (offset 16 lines).
patching file libvtv/Makefile.in
Hunk #1 succeeded at 14 with fuzz 1 (offset -1 lines).
source is at 'gcc-11.3.0'
applying 
'/gnu/store/g0ba4l825z9i4l1jd5cqvl6m09xicdwa-gcc-9-strmov-store-file-names.patch'...
applying 
'/gnu/store/5705r4ajxl8lav1hz9xm19w75zdcz1n2-gcc-5.0-libvtv-runpath.patch'...
find-files: 
gcc-11.3.0/gcc/testsuite/go.test/test/fixedbugs/issue27836.dir/Äfoo.go: No such 
file or directory
Backtrace:
In srfi/srfi-1.scm:
 465: 19 [fold #<procedure 143cb10 at ice-9/ftw.scm:451:38 (subdir 
result+visited)> ...]
In ice-9/ftw.scm:
 452: 18 [#<procedure 143cb10 at ice-9/ftw.scm:451:38 (subdir result+visited)> 
# #]
 450: 17 [loop "gcc" "gcc-11.3.0" ...]
In srfi/srfi-1.scm:
 465: 16 [fold #<procedure 2375210 at ice-9/ftw.scm:451:38 (subdir 
result+visited)> ...]
In ice-9/ftw.scm:
 452: 15 [#<procedure 2375210 at ice-9/ftw.scm:451:38 (subdir result+visited)> 
# #]
 450: 14 [loop "testsuite" "gcc-11.3.0/gcc" ...]
In srfi/srfi-1.scm:
 465: 13 [fold #<procedure ebad80 at ice-9/ftw.scm:451:38 (subdir 
result+visited)> ...]
In ice-9/ftw.scm:
 452: 12 [#<procedure ebad80 at ice-9/ftw.scm:451:38 (subdir result+visited)> # 
#]
 450: 11 [loop "go.test" "gcc-11.3.0/gcc/testsuite" ...]
In srfi/srfi-1.scm:
 465: 10 [fold #<procedure 219a4b0 at ice-9/ftw.scm:451:38 (subdir 
result+visited)> ...]
In ice-9/ftw.scm:
 452: 9 [#<procedure 219a4b0 at ice-9/ftw.scm:451:38 (subdir result+visited)> # 
#]
 450: 8 [loop "test" "gcc-11.3.0/gcc/testsuite/go.test" ...]
In srfi/srfi-1.scm:
 465: 7 [fold #<procedure 229ba80 at ice-9/ftw.scm:451:38 (subdir 
result+visited)> ...]
In ice-9/ftw.scm:
 452: 6 [#<procedure 229ba80 at ice-9/ftw.scm:451:38 (subdir result+visited)> # 
#]
 450: 5 [loop "fixedbugs" "gcc-11.3.0/gcc/testsuite/go.test/test" ...]
In srfi/srfi-1.scm:
 465: 4 [fold #<procedure 20bab70 at ice-9/ftw.scm:451:38 (subdir 
result+visited)> ...]
In ice-9/ftw.scm:
 452: 3 [#<procedure 20bab70 at ice-9/ftw.scm:451:38 (subdir result+visited)> # 
#]
 474: 2 [loop "issue27836.dir" ...]
In guix/build/utils.scm:
 540: 1 [#<procedure d188e0 at guix/build/utils.scm:536:28 (file stat errno 
result)> 
"gcc-11.3.0/gcc/testsuite/go.test/test/fixedbugs/issue27836.dir/Äfoo.go" ...]
In unknown file:
   ?: 0 [scm-error misc-error #f "~A" ("find-files failed") #f]

ERROR: In procedure scm-error:
ERROR: find-files failed
--8<---------------cut here---------------end--------------->8---

Deleting these files also don't work for the same reason, even when
using the hex representation, i.e. (delete-file "\u00c4foo.go"), or with
DELETE-FILE-RECURSIVELY.

One workaround is to avoid the use of BOOTSTRAP-ORIGIN by applying the
patches and snippet in phases, but that's suboptimal because it has to
be done for all of GCC-BOOT0, LIBSTDC++, and GCC-FINAL.

I'll try this workaround to get things going, but hoping for better
suggestions!