[Parity] New build system doesn't find header files

[flexlixrup]

Is it reproducible with SwiftPM command-line tools: swift build, swift test, swift package etc?

• Confirmed reproduction steps with SwiftPM CLI. The description text must include reproduction steps with either of command-line SwiftPM commands, swift build, swift test, swift package etc.

Description

When building with --build-system swiftbuild my package https://github.com/flexlixrup/pulsar-client-swift-cpp fails with the following error:

Building for debugging...
error: /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/Sources/Bridge/lib/ListenerShim.cpp:2:10 'pulsar/ConsumerConfiguration.h' file not found
error: CompileC /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/ListenerShim.o /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/Sources/Bridge/lib/ListenerShim.cpp normal arm64 c++ com.apple.compilers.llvm.clang.1_0.compiler failed with a nonzero exit code. Command line:     cd /Users/felixruppert/Developer/Swift/Pulsar
    
    Using response file: /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/82b82416624d2658e5098eb0a28c15c5-common-args.resp
    
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x c++ -ivfsstatcache /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/SDKStatCaches.noindex/macosx26.0-25A352-a0facfad118c1a7a18f0aad9463f654928806144b0707e398aac92880fa50324.sdkstatcache -target arm64-apple-macos26.0 -fmessage-length\=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit\=0 -fno-color-diagnostics -fmodules-prune-interval\=86400 -fmodules-prune-after\=345600 -fbuild-session-file\=/Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/ModuleCache.noindex/Session.modulevalidation -fmodules-validate-once-per-build-session -Wnon-modular-include-in-framework-module -Werror\=non-modular-include-in-framework-module -Wno-trigraphs -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-return-type -Wno-non-virtual-dtor -Wno-overloaded-virtual -Wno-exit-time-destructors -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wno-unused-variable -Wunused-value -Wno-empty-body -Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-bool-conversion -Wno-enum-conversion -Wno-float-conversion -Wno-non-literal-null-conversion -Wno-objc-literal-conversion -Wshorten-64-to-32 -Wno-newline-eof -Wno-c++11-extensions -Wno-implicit-fallthrough -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.0.sdk -fstrict-aliasing -Wdeprecated-declarations -Winvalid-offsetof -Wno-sign-conversion -Wno-infinite-recursion -Wno-move -Wno-comma -Wno-block-capture-autoreleasing -Wno-strict-prototypes -Wno-range-loop-analysis -Wno-semicolon-before-method-body -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.0.sdk @/Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/82b82416624d2658e5098eb0a28c15c5-common-args.resp -MMD -MT dependencies -MF /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/ListenerShim.d --serialize-diagnostics /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/ListenerShim.dia -c /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/Sources/Bridge/lib/ListenerShim.cpp -o /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/ListenerShim.o
error: CompileC /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/LoggerShim.o /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/Sources/Bridge/lib/LoggerShim.cpp normal arm64 c++ com.apple.compilers.llvm.clang.1_0.compiler failed with a nonzero exit code. Command line:     cd /Users/felixruppert/Developer/Swift/Pulsar
    
    Using response file: /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/82b82416624d2658e5098eb0a28c15c5-common-args.resp
    
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x c++ -ivfsstatcache /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/SDKStatCaches.noindex/macosx26.0-25A352-a0facfad118c1a7a18f0aad9463f654928806144b0707e398aac92880fa50324.sdkstatcache -target arm64-apple-macos26.0 -fmessage-length\=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit\=0 -fno-color-diagnostics -fmodules-prune-interval\=86400 -fmodules-prune-after\=345600 -fbuild-session-file\=/Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/ModuleCache.noindex/Session.modulevalidation -fmodules-validate-once-per-build-session -Wnon-modular-include-in-framework-module -Werror\=non-modular-include-in-framework-module -Wno-trigraphs -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-return-type -Wno-non-virtual-dtor -Wno-overloaded-virtual -Wno-exit-time-destructors -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wno-unused-variable -Wunused-value -Wno-empty-body -Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-bool-conversion -Wno-enum-conversion -Wno-float-conversion -Wno-non-literal-null-conversion -Wno-objc-literal-conversion -Wshorten-64-to-32 -Wno-newline-eof -Wno-c++11-extensions -Wno-implicit-fallthrough -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.0.sdk -fstrict-aliasing -Wdeprecated-declarations -Winvalid-offsetof -Wno-sign-conversion -Wno-infinite-recursion -Wno-move -Wno-comma -Wno-block-capture-autoreleasing -Wno-strict-prototypes -Wno-range-loop-analysis -Wno-semicolon-before-method-body -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX26.0.sdk @/Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/82b82416624d2658e5098eb0a28c15c5-common-args.resp -MMD -MT dependencies -MF /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/LoggerShim.d --serialize-diagnostics /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/LoggerShim.dia -c /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/Sources/Bridge/lib/LoggerShim.cpp -o /Users/felixruppert/Developer/Swift/Pulsar/pulsar-client-swift/.build/arm64-apple-macosx/Intermediates.noindex/pulsar-client-swift.build/Debug/Bridge.build/Objects-normal/arm64/LoggerShim.o

error: Build failed

It works as expected with the native-build system. Happens with 6.2, main-snapshot and I also tried it with building the SwiftPM from main myself to verify if it gets fixed by #9301

Expected behavior

Build normally

Actual behavior

Build fails

Steps to reproduce

1. clone the repo
2. run 'swift build --build-system swiftbuild

Swift Package Manager version/commit hash

Multiple

Swift & OS version (output of swift --version ; uname -a)

Apple Swift version 6.3-dev (LLVM d8e7cc748ee6e7f, Swift a07ea37d0054945)
Target: arm64-apple-macosx26.0
Build config: +assertions
Darwin Felix-MacBook.local 25.0.0 Darwin Kernel Version 25.0.0: Wed Sep 17 21:41:45 PDT 2025; root:xnu-12377.1.9~141/RELEASE_ARM64_T6000 arm64

[owenv]

We're not parsing artifactbundle contents correctly on macOS right now

[owenv]

Addressed in swiftlang/swift-build#900

[flexlixrup]

Hi @owenv, thanks for the fast fix; when can this be expected in the swift-package-manager main branch to be verified?