When building quicly in Ubintu under Windows Subsystem for Linux there is an error in the generated embedded-probes.h file. There is no matching #endif in the end.

probe2trace.pl:

my $arch = $^O; # here 'linux'

GetOptions("arch=s" => \$arch) # here embedded
    or die "invalid command option\n";

After GetOptions(..) arch contains embedded with some extra character in the end. Probably /n. Therefore the following condition returns false:

if ($arch eq 'embedded\r') {
print << 'EOT';

#endif
EOT
}

The best I could do to trace the issue without known perl:

print "Arch in the end: $arch\n";

if ($arch eq 'embedded') {
print << 'EOT';

#endif
EOT
}
else {
print "Arch does not match embedded: $arch...";
}

results in:

Arch in the end: embedded
Arch does not match embedded: embedded
...