bug#57316: (core-updates) dejagnu@1.6.3 sometimes fails to build

[Maxime Devos]

On the build farm, dejagnu sometimes fails to build:

https://ci.guix.gnu.org/build/1229968/log/raw

> ERROR: -------------------------------------------
> ERROR: in testcase ./testsuite/runtest.libs/libs.exp
> ERROR:  send: spawn id exp6 not open
> ERROR:  tcl error code NONE
> ERROR:  tcl error info:
> send: spawn id exp6 not open
>     while executing
> "exp_send "interp delete test_case""
>     invoked from within
> "if [file exists $test] {
> 	verbose "Processing test $test" 2
>
> 	exp_send "interp create test_case\n"
> 	expect "interp create test_case*test_case*expect*>..."
>     (procedure "process_test" line 9)
>     invoked from within
> "process_test $i "
>     ("foreach" body line 2)
>     invoked from within
> "foreach i [lsort -dictionary [glob [testsuite file -source -test *.test]]] {
>     if { [runtest_file_p $runtests $i] } { process_test $i }
> }"
>     (file "./testsuite/runtest.libs/libs.exp" line 100)
>     invoked from within
> "source ./testsuite/runtest.libs/libs.exp"
>     ("uplevel" body line 1)
>     invoked from within
> "uplevel #0 source ./testsuite/runtest.libs/libs.exp"
>     invoked from within
> "catch "uplevel #0 source $test_file_name" msg"
>       
      I cannot reproduce this locally.

This "send: spawn id exp8 not open" has been noticed in LFS, at <https://wiki.linuxfromscratch.org/lfs/ticket/4871>. There it has been proposed to run the build out-of-source.

TODO: give '#:out-of-source? #true' a try.

Greetings,
Maxime.

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