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Fix to allow -o flag to point to a directory

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Previously, running 'tinygo build -o dist/ file.go' where dist/ already
exists as a directory failed with 'open dist/: is a directory', because
Build() only auto-derived a binary name when outpath was empty, not when
it pointed to an existing directory. This adds that check, matching the
behavior of 'go build -o dir/' with a package.

Note: only handles the case where the directory already exists; if the
directory doesn't exist yet, behavior is unchanged.
This commit is contained in:
Mohammed-Asad-Khan
2026-08-01 14:42:42 +00:00
committed by Damian Gryski
parent c2346570fb
commit 854f91ecf2
1 changed files with 8 additions and 1 deletions
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main.go
+8 -1
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@@ -177,8 +177,15 @@ func Build(pkgName, outpath string, config *compileopts.Config) error {
// Pick a default output path based on the main directory.
outpath = filepath.Base(result.MainDir) + config.DefaultBinaryExtension()
}
} else if fi, statErr := os.Stat(outpath); statErr == nil && fi.IsDir() {
var name string
if strings.HasSuffix(pkgName, ".go") {
name = filepath.Base(pkgName[:len(pkgName)-3]) + config.DefaultBinaryExtension()
} else {
name = filepath.Base(result.MainDir) + config.DefaultBinaryExtension()
}
outpath = filepath.Join(outpath, name)
}
if err := os.Rename(result.Binary, outpath); err != nil {
// Moving failed. Do a file copy.
inf, err := os.Open(result.Binary)