zig build fails when a custom output directory is set with setOutputDir

[AnthonyYoManz]

Reproduction steps:

• Be on Windows
• Create an empty folder called 'test_project' and run zig init-exe
• Add the following line to 'build.zig': exe.setOutputDir("out");
• Run zig build
• Build claims failure, citing a file could not be found
• Executable has been successfully output into test_project/out
• No PDB file is present in test_project/out

Adding a warn call to std.fs.file.File.openRead suggests that an attempt is made to read from 'test_project/out/test_project.pdb' when it does not exist, causing the FileNotFound error and the build failure message.

build log.txt

[AnthonyYoManz]

Running with --verbose (sorry for not doing this previously) has revealed that the PDB file doesn't get copied out of zig-cache/o/xxxx/*.pdb to out/*.pdb

[AnthonyYoManz]

Here we copy the executable from cache to the output directory, but not the PDB.

I can't see a neat way of getting the necessary paths for copying the PDB across without just fiddling with the executable filename, but I'm not too familiar with the source.

zig/std/build.zig

Lines 1957 to 1961 in 925ffbc

	const full_dest = try fs.path.join(builder.allocator, [_][]const u8{
	output_dir,
	fs.path.basename(output_path),
	});
	try builder.updateFile(output_path, full_dest);