Parse::Yapp::KeyValue build loses generated Parser.pm

首先复现干净的 Parse::Yapp::KeyValue 构建，并检查 MakeParser.PL、生成的 Makefile target 以及 PerlOnJava 对构建和文件系统的处理。比较 interpreter 和 JVM 的结果，然后使用 t/1pod.t 和 t/2keyvalue.t 作为重点回归测试套件。完成的标准是嵌套 Parser.pm 的生成成功，或者构建立即失败，并且两个测试在两个 backend 上都通过。

Summary

Parse::Yapp::KeyValue 0.1 passes its complete upstream test suite under system Perl, but PerlOnJava fails because the distribution's build-time MakeParser.PL step does not create the generated Parser.pm file.

Reproduction

CPAN random tester run: 20260918-141920-96054

Distribution: Parse::Yapp::KeyValue 0.1 (reported module version is 0.10)

The exact prerequisite distributions were installed into an isolated library for the system-Perl comparison:

• Parse::Template 3.08
• Parse::Lex 2.21
• Parse::Yapp 1.21

System Perl 5.42.2:

All tests successful.
Files=2, Tests=17
Result: PASS

PerlOnJava:

Files=2, Tests=2
Result: FAIL
Failed 1/2 test programs. 1/2 subtests failed.

Failure details

The distribution's MakeParser.PL contains:

my $path = 'blib/lib/Parse/Yapp/KeyValue';
my $file = "$path/Parser.pm";
my $parser = new Parse::Yapp(inputfile => 'grammar.yp');
mkdir $path || die "could not create directory $path: $!";
open(FILE, ">$file") || die "unable to open $file: $!";

On PerlOnJava, make invokes this generator and reports:

unable to open blib/lib/Parse/Yapp/KeyValue/Parser.pm: No such file or directory at MakeParser.PL line 10.
make: [pl_files] Error 2 (ignored)

The generated file is absent afterward. The make target nevertheless reports a successful build because the generator error is ignored. The subsequent test failure is:

Can't locate Parse/Yapp/KeyValue/Parser.pm in @INC

and t/2keyvalue.t cannot load Parse::Yapp::KeyValue.

The other test file, t/1pod.t, passes.

Scope and diagnosis

This is reproducible on the current PerlOnJava build with a clean extracted distribution. It is not caused by Parse::Yapp's grammar generation: running the same MakeParser.PL with the interpreter backend succeeds when the destination parent directory is pre-created and produces Parser.pm correctly.

The failure is therefore in PerlOnJava's build/filesystem handling for the nested generated-file destination, or in the interaction between that handling and the generated Makefile target. The ignored generator error also allows an incomplete build to proceed to testing.

Expected behavior

make should generate blib/lib/Parse/Yapp/KeyValue/Parser.pm successfully, or fail the build immediately if generation fails. After generation, both t/1pod.t and t/2keyvalue.t should pass on the JVM and interpreter backends.

Please add a focused regression test for nested directory creation/generated-file output and verify the full Parse::Yapp::KeyValue suite after the fix.