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Fix Android build for non-default NDKs with new swift-build build system, by updating ANDROID_NDK_ROOT too #280

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Fix Android build for non-default NDKs with new swift-build build system, by updating ANDROID_NDK_ROOT too #280

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4 changes: 4 additions & 0 deletions .github/workflows/scripts/install-and-build-with-sdk.sh
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Expand Up @@ -815,12 +815,16 @@ build() {

alias swift='$SWIFT_EXECUTABLE_FOR_ANDROID_SDK'

log "Using NDK at $ANDROID_NDK_HOME"
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@finagolfin finagolfin Jun 7, 2026

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@jakepetroules, swift-build is not using this environment variable properly on the GitHub CI, where it is correctly set to 28c before the build starts, but the internal compile shows it using NDK 27 instead. I tried setting it in $GITHUB_ENV also in the next line, but that made no difference.

This is why I pushed to not have these flaky env vars be the primary way we configure the NDK for SwiftPM, and to always notify the user that the env var is being used and with which NDK path.

Let me know if you have any idea about this bug.

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@jakepetroules jakepetroules Jun 8, 2026

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Swift Build checks both ANDROID_NDK_ROOT and ANDROID_NDK_HOME, with the first taking precedence. Since GitHub Actions sets both, _ROOT is pointing to 27 still.

Go ahead and update GitHub actions to set both variables.

It's probably a good idea to emit a diagnostic in Swift Build if those two are set to different values.

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@finagolfin finagolfin Jun 8, 2026

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Yep, that was it, will clean this up and submit as a workaround for now.


# This can become a single invocation in the future when `swift build` supports multiple Android triples at once
for android_sdk_triple in "${ANDROID_SDK_TRIPLES[@]}" ; do
if [[ "$SWIFT_VERSION_INPUT" == "6.3" || "$SWIFT_VERSION_INPUT" == "nightly-6.3" ]]; then
local build_command="$SWIFT_BUILD_COMMAND --swift-sdk ${android_sdk_triple}"
else
local build_command="$SWIFT_BUILD_COMMAND --swift-sdk ${sdk_name} --triple ${android_sdk_triple}"
# Work around swift-build issue with ANDROID_NDK_ROOT overriding ANDROID_NDK_HOME
export ANDROID_NDK_ROOT="${ANDROID_NDK_HOME}"
fi
if [[ -n "$SWIFT_BUILD_FLAGS" ]]; then
build_command="$build_command $SWIFT_BUILD_FLAGS"
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