Intermittent meson failures on msys2

[Richard Henderson]

Hi guys,

There's an occasional failure on msys2, where meson fails to capture the output of a build 
script.  E.g.

https://gitlab.com/qemu-project/qemu/-/jobs/2642051161

FAILED: ui/input-keymap-qcode-to-linux.c.inc
"C:/GitLab-Runner/builds/qemu-project/qemu/msys64/mingw64/bin/python3.exe" 
"C:/GitLab-Runner/builds/qemu-project/qemu/meson/meson.py" "--internal" "exe" "--capture" 
"ui/input-keymap-qcode-to-linux.c.inc" "--" 
"C:/GitLab-Runner/builds/qemu-project/qemu/msys64/mingw64/bin/python3.exe" 
"../ui/keycodemapdb/tools/keymap-gen" "code-map" "--lang" "glib2" "--varname" 
"qemu_input_map_qcode_to_linux" "../ui/keycodemapdb/data/keymaps.csv" "qcode" "linux"
[301/1665] Generating input-keymap-qcode-to-qnum.c.inc with a custom command (wrapped by 
meson to capture output)
ninja: build stopped: subcommand failed.


https://gitlab.com/qemu-project/qemu/-/jobs/2625836697

FAILED: ui/shader/texture-blit-frag.h
"C:/GitLab-Runner/builds/qemu-project/qemu/msys64/mingw64/bin/python3.exe" 
"C:/GitLab-Runner/builds/qemu-project/qemu/meson/meson.py" "--internal" "exe" "--capture" 
"ui/shader/texture-blit-frag.h" "--" "perl" 
"C:/GitLab-Runner/builds/qemu-project/qemu/scripts/shaderinclude.pl" 
"../ui/shader/texture-blit.frag"
[313/1663] Generating texture-blit-vert.h with a custom command (wrapped by meson to 
capture output)
ninja: build stopped: subcommand failed.


Could you have a look please?


r~