stm32-uart-echo Build Error

[fumoboy007]

I am trying to build the stm32-uart-echo example but not sure what I am doing wrong. I get the following error during the swift-build step:

<unknown>:0: error: unable to load standard library for target 'armv7em-apple-none-macho'

My build command:

TOOLCHAINS="Swift Development Snapshot 2024-04-03 (a)" make

Any ideas?

[MaxDesiatov]

What's the output of swift --version after setting TOOLCHAINS this way? I suspect the value of TOOLCHAINS is wrong, I've never seen it set in this format. IIUC the top-level swift shim expects to be a plist key instead of a human readable version string.

[fumoboy007]

Hi, @MaxDesiatov! Both Swift Development Snapshot 2024-04-03 (a) and org.swift.59202404031a produce the same result:

% TOOLCHAINS="Swift Development Snapshot 2024-04-03 (a)" swift --version
Apple Swift version 6.0-dev (LLVM cb4f50b342f3cf9, Swift fc5da5342ce965c)
Target: arm64-apple-macosx14.0

Here is the full build log (with some newlines to improve readability):

% TOOLCHAINS=org.swift.59202404031a make   
           
compling...
/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/swift-build \
		--configuration release \
		--verbose \
		--triple armv7em-apple-none-macho \
		-Xcc -D__APPLE__ -Xcc -D__MACH__ \
		-Xswiftc -Xfrontend -Xswiftc -disable-stack-protector

warning: 'stm32-uart-echo': /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/Package.swift -target arm64-apple-macosx13.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -I /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -vfsoverlay /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.fIYEGn/vfs.yaml -swift-version 5 -package-description-version 5.10.0 -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -empty-abi-descriptor -Xcc -working-directory -Xcc /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo -resource-dir /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift -module-name main -target-sdk-version 14.4 -target-sdk-name macosx14.4 -external-plugin-path '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server' -external-plugin-path '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server' -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/local/lib/swift/host/plugins -o /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.oSAmSg/Package-1.o

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/clang /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.oSAmSg/Package-1.o -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks --sysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk --target=arm64-apple-macosx13.0 /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/macosx/libswiftCompatibilityPacks.a -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/macosx -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk/usr/lib/swift -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -lPackageDescription -Xlinker -rpath -Xlinker /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -o /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.E0czcf/stm32-uart-echo-manifest

Apple Swift version 6.0-dev (LLVM cb4f50b342f3cf9, Swift fc5da5342ce965c)
Target: arm64-apple-macosx13.0
Planning build

warning: 'swift-mmio': /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-mmio/Package.swift -target arm64-apple-macosx13.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -I /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -vfsoverlay /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.sn4R1Z/vfs.yaml -swift-version 5 -package-description-version 5.9.0 -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -empty-abi-descriptor -Xcc -working-directory -Xcc /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo -resource-dir /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift -module-name main -target-sdk-version 14.4 -target-sdk-name macosx14.4 -external-plugin-path '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server' -external-plugin-path '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server' -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/local/lib/swift/host/plugins -o /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.rSnA19/Package-1.o

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/clang /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.rSnA19/Package-1.o -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks --sysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk --target=arm64-apple-macosx13.0 /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/macosx/libswiftCompatibilityPacks.a -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/macosx -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk/usr/lib/swift -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -lPackageDescription -Xlinker -rpath -Xlinker /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -o /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.tkTpC7/swift-mmio-manifest

Apple Swift version 6.0-dev (LLVM cb4f50b342f3cf9, Swift fc5da5342ce965c)
Target: arm64-apple-macosx13.0

warning: 'swift-syntax': /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-syntax/Package.swift -target arm64-apple-macosx13.0 -Xllvm -aarch64-use-tbi -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -I /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -vfsoverlay /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.Wc95g8/vfs.yaml -swift-version 5 -package-description-version 5.7.0 -disable-implicit-concurrency-module-import -disable-implicit-string-processing-module-import -empty-abi-descriptor -Xcc -working-directory -Xcc /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo -resource-dir /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift -module-name main -target-sdk-version 14.4 -target-sdk-name macosx14.4 -external-plugin-path '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server' -external-plugin-path '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/local/lib/swift/host/plugins#/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/bin/swift-plugin-server' -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/local/lib/swift/host/plugins -o /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.3hb3tm/Package-1.o

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/clang /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.3hb3tm/Package-1.o -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks --sysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk --target=arm64-apple-macosx13.0 /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/macosx/libswiftCompatibilityPacks.a -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/macosx -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk/usr/lib/swift -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -L /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -lPackageDescription -Xlinker -rpath -Xlinker /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/pm/ManifestAPI -o /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.fZWB30/swift-syntax-manifest

Apple Swift version 6.0-dev (LLVM cb4f50b342f3cf9, Swift fc5da5342ce965c)
Target: arm64-apple-macosx13.0
Building for production...

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/clang -target armv7em-apple-none-macho -O2 -DSWIFT_PACKAGE=1 -fblocks -I /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/Sources/Support/include --sysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -fPIC -g -D__APPLE__ -D__MACH__ -MD -MT dependencies -MF /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Support.build/startup.S.d -c /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/Sources/Support/startup.S -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Support.build/startup.S.o

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/clang -target armv7em-apple-none-macho -O2 -DSWIFT_PACKAGE=1 -fblocks -I /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/Sources/Support/include --sysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -fPIC -g -D__APPLE__ -D__MACH__ -MD -MT dependencies -MF /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Support.build/Support.c.d -c /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/Sources/Support/Support.c -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Support.build/Support.c.o

Write auxiliary file /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/swift-version--53E1F52610E069FA.txt

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/swiftc -module-name SwiftSyntax509 -emit-dependencies -emit-module -emit-module-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules/SwiftSyntax509.swiftmodule -output-file-map /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/SwiftSyntax509.build/output-file-map.json -parse-as-library -whole-module-optimization -num-threads 10 -c @/Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/SwiftSyntax509.build/sources -I /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules -target armv7em-apple-none-macho -swift-version 5 -v -O -j10 -DSWIFT_PACKAGE -module-cache-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/ModuleCache -parseable-output -parse-as-library -color-diagnostics -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -g -Xfrontend -disable-stack-protector -Xcc --sysroot -Xcc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -Xcc -F -Xcc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -Xcc -fPIC -Xcc -g -Xcc -D__APPLE__ -Xcc -D__MACH__ -suppress-warnings

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/swiftc -module-name MMIOUtilities -emit-dependencies -emit-module -emit-module-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules/MMIOUtilities.swiftmodule -output-file-map /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/MMIOUtilities.build/output-file-map.json -parse-as-library -whole-module-optimization -num-threads 10 -c @/Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/MMIOUtilities.build/sources -I /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules -target armv7em-apple-none-macho -swift-version 5 -v -O -j10 -DSWIFT_PACKAGE -module-cache-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/ModuleCache -parseable-output -parse-as-library -color-diagnostics -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -L /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -g -Xfrontend -disable-stack-protector -Xcc --sysroot -Xcc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -Xcc -F -Xcc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -Xcc -fPIC -Xcc -g -Xcc -D__APPLE__ -Xcc -D__MACH__ -suppress-warnings -package-name swift_mmio

Apple Swift version 6.0-dev (LLVM cb4f50b342f3cf9, Swift fc5da5342ce965c)
Apple Swift version 6.0-dev (LLVM cb4f50b342f3cf9, Swift fc5da5342ce965c)
Target: armv7em-apple-none-macho
Target: armv7em-apple-none-macho

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/swift-frontend -frontend -c /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-syntax/Sources/SwiftSyntax509/Empty.swift -emit-module-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules/SwiftSyntax509.swiftmodule -emit-module-doc-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules/SwiftSyntax509.swiftdoc -emit-module-source-info-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules/SwiftSyntax509.swiftsourceinfo -emit-dependencies-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/SwiftSyntax509.build/SwiftSyntax509.d -target armv7em-apple-none-macho -disable-objc-interop -I /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -color-diagnostics -g -debug-info-format=dwarf -dwarf-version=4 -module-cache-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/ModuleCache -suppress-warnings -swift-version 5 -O -D SWIFT_PACKAGE -disable-stack-protector -empty-abi-descriptor -Xcc -working-directory -Xcc /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo -resource-dir /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift -file-compilation-dir /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo -Xcc --sysroot -Xcc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -Xcc -F -Xcc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -Xcc -fPIC -Xcc -g -Xcc -D__APPLE__ -Xcc -D__MACH__ -module-name SwiftSyntax509 -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/local/lib/swift/host/plugins -enable-default-cmo -parse-as-library -num-threads 10 -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/SwiftSyntax509.build/Empty.swift.o

/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/bin/swift-frontend -frontend -c /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-mmio/Sources/MMIOUtilities/LLVMDiagnostics/LLVMDiagnostic.swift /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-mmio/Sources/MMIOUtilities/LLVMDiagnostics/LLVMDiagnosticKind.swift /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-mmio/Sources/MMIOUtilities/LLVMDiagnostics/Parser+LLVMDiagnostic.swift /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-mmio/Sources/MMIOUtilities/Parser+Integer.swift /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-mmio/Sources/MMIOUtilities/Parser.swift /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/checkouts/swift-mmio/Sources/MMIOUtilities/StringInterpolation+Hex.swift -supplementary-output-file-map /var/folders/kn/9dnh9mbx24zcltl6p8syx1w00000gn/T/TemporaryDirectory.i7R5Bg/supplementaryOutputs-1 -target armv7em-apple-none-macho -disable-objc-interop -I /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/Modules -I /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/usr/lib -F /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -color-diagnostics -g -debug-info-format=dwarf -dwarf-version=4 -module-cache-path /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/ModuleCache -suppress-warnings -swift-version 5 -O -D SWIFT_PACKAGE -disable-stack-protector -empty-abi-descriptor -Xcc -working-directory -Xcc /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo -resource-dir /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift -file-compilation-dir /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo -Xcc --sysroot -Xcc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX14.4.sdk -Xcc -F -Xcc /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/Library/Frameworks -Xcc -fPIC -Xcc -g -Xcc -D__APPLE__ -Xcc -D__MACH__ -module-name MMIOUtilities -package-name swift_mmio -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/lib/swift/host/plugins -plugin-path /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2024-04-03-a.xctoolchain/usr/local/lib/swift/host/plugins -enable-default-cmo -parse-as-library -num-threads 10 -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/MMIOUtilities.build/LLVMDiagnostic.swift.o -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/MMIOUtilities.build/LLVMDiagnosticKind.swift.o -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/MMIOUtilities.build/Parser+LLVMDiagnostic.swift.o -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/MMIOUtilities.build/Parser+Integer.swift.o -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/MMIOUtilities.build/Parser.swift.o -o /Users/fumoboy007/Downloads/swift-embedded-examples/stm32-uart-echo/.build/armv7em-apple-none-macho/release/MMIOUtilities.build/StringInterpolation+Hex.swift.o

<unknown>:0: error: unable to load standard library for target 'armv7em-apple-none-macho'
<unknown>:0: error: unable to load standard library for target 'armv7em-apple-none-macho'

make: *** [build] Error 1

[fumoboy007]

There seem to be a lot of references to Xcode. I wonder if that’s expected.

[unnamedd]

@fumoboy007 give a try checking the swift-playdate-examples source code, especially this part here where the toolchain is being taken automatically to help in the compilation.

[fumoboy007]

@unnamedd As I have shown above, I think the correct toolchain is being selected. Thanks for the additional example though!

[andelf]

Same here. Any ideas?
-enable-experimental-feature Embedded is not added while building, this might be the reason why standard library is required.
If I added this, then swift-mmio dependency fails complaining about String is not available in embedded Swift.

[kubamracek]

I think (a part of) the problem is the TOOLCHAINS="Swift Development Snapshot 2024-07-07 (a)" syntax -- this doesn't actually select the right toolchain. Use the TOOLCHAINS=org.swift.59202407071a syntax.

I have just tried building the stm32-uart-echo example with the latest downloadable swift.org toolchain and it builds correctly. @fumoboy007 can you try again, too?

[fumoboy007]

It’s not related to the environment variable syntax. It seems something was broken in the 2024-04-03 Swift toolchain. 2024-07-11 works now.