Swift Package IndexBuild Information
Failed to build FlockKit, reference main (1a7e0b), with Swift 6.1 for Linux on 11 Dec 2025 14:55:28 UTC.
Build Command
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1Build Log
========================================
RunAll
========================================
Builder version: 4.68.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/avnerbarr/FlockKit.git
Reference: main
Initialized empty Git repository in /host/spi-builder-workspace/.git/
hint: Using 'master' as the name for the initial branch. This default branch name
hint: is subject to change. To configure the initial branch name to use in all
hint: of your new repositories, which will suppress this warning, call:
hint:
hint: git config --global init.defaultBranch <name>
hint:
hint: Names commonly chosen instead of 'master' are 'main', 'trunk' and
hint: 'development'. The just-created branch can be renamed via this command:
hint:
hint: git branch -m <name>
From https://github.com/avnerbarr/FlockKit
* branch main -> FETCH_HEAD
* [new branch] main -> origin/main
HEAD is now at 1a7e0b0 gendocs
Cloned https://github.com/avnerbarr/FlockKit.git
Revision (git rev-parse @):
1a7e0b08db334259b3cd1379aea7b30b2ff5d342
SUCCESS checkout https://github.com/avnerbarr/FlockKit.git at main
========================================
Build
========================================
Selected platform: linux
Swift version: 6.1
Building package at path: $PWD
https://github.com/avnerbarr/FlockKit.git
https://github.com/avnerbarr/FlockKit.git
WARNING: environment variable SUPPRESS_SWIFT_6_FLAGS is not set
{
"dependencies" : [
{
"identity" : "swift-docc-plugin",
"requirement" : {
"range" : [
{
"lower_bound" : "1.0.0",
"upper_bound" : "2.0.0"
}
]
},
"type" : "sourceControl",
"url" : "https://github.com/apple/swift-docc-plugin"
}
],
"manifest_display_name" : "FlockKit",
"name" : "FlockKit",
"path" : "/host/spi-builder-workspace",
"platforms" : [
],
"products" : [
{
"name" : "FlockKit",
"targets" : [
"FlockKit"
],
"type" : {
"library" : [
"automatic"
]
}
},
{
"name" : "LockTestHelper",
"targets" : [
"LockTestHelper"
],
"type" : {
"executable" : null
}
}
],
"targets" : [
{
"c99name" : "LockTestHelper",
"module_type" : "SwiftTarget",
"name" : "LockTestHelper",
"path" : "Sources/LockTestHelper",
"product_memberships" : [
"LockTestHelper"
],
"sources" : [
"main.swift"
],
"target_dependencies" : [
"FlockKit"
],
"type" : "executable"
},
{
"c99name" : "FlockKitTests",
"module_type" : "SwiftTarget",
"name" : "FlockKitTests",
"path" : "Tests/FlockKitTests",
"sources" : [
"FlockKitTests.swift"
],
"target_dependencies" : [
"FlockKit"
],
"type" : "test"
},
{
"c99name" : "FlockKit",
"module_type" : "SwiftTarget",
"name" : "FlockKit",
"path" : "Sources/FlockKit",
"product_memberships" : [
"FlockKit",
"LockTestHelper"
],
"sources" : [
"Errno.swift",
"FlockKit.swift"
],
"type" : "library"
}
],
"tools_version" : "6.1"
}
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu -Xswiftc -Xfrontend -Xswiftc -stats-output-dir -Xswiftc -Xfrontend -Xswiftc .stats -Xswiftc -strict-concurrency=complete -Xswiftc -enable-upcoming-feature -Xswiftc StrictConcurrency -Xswiftc -enable-upcoming-feature -Xswiftc DisableOutwardActorInference -Xswiftc -enable-upcoming-feature -Xswiftc GlobalActorIsolatedTypesUsability -Xswiftc -enable-upcoming-feature -Xswiftc InferSendableFromCaptures 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:4d72617259f6eef9908440c49a67b79bc4f973ae19f78187418ddfb5b178d4ec
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
Fetching https://github.com/apple/swift-docc-plugin
[1/2158] Fetching swift-docc-plugin
Fetched https://github.com/apple/swift-docc-plugin from cache (0.80s)
Computing version for https://github.com/apple/swift-docc-plugin
Computed https://github.com/apple/swift-docc-plugin at 1.4.5 (3.34s)
Fetching https://github.com/swiftlang/swift-docc-symbolkit
[1/3594] Fetching swift-docc-symbolkit
Fetched https://github.com/swiftlang/swift-docc-symbolkit from cache (0.39s)
Computing version for https://github.com/swiftlang/swift-docc-symbolkit
Computed https://github.com/swiftlang/swift-docc-symbolkit at 1.0.0 (1.04s)
Creating working copy for https://github.com/swiftlang/swift-docc-symbolkit
Working copy of https://github.com/swiftlang/swift-docc-symbolkit resolved at 1.0.0
Creating working copy for https://github.com/apple/swift-docc-plugin
Working copy of https://github.com/apple/swift-docc-plugin resolved at 1.4.5
[1/1] Compiling plugin Swift-DocC Preview
[2/2] Compiling plugin Swift-DocC
Building for debugging...
[2/9] Write sources
[4/9] Write swift-version-24593BA9C3E375BF.txt
[6/12] Compiling FlockKit Errno.swift
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
[7/12] Compiling FlockKit FlockKit.swift
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
[8/12] Emitting module FlockKit
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
[9/13] Wrapping AST for FlockKit for debugging
[11/15] Emitting module LockTestHelper
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
[12/15] Compiling LockTestHelper main.swift
<unknown>:0: warning: upcoming feature 'InferSendableFromCaptures' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'GlobalActorIsolatedTypesUsability' is already enabled as of Swift version 6
<unknown>:0: warning: upcoming feature 'DisableOutwardActorInference' is already enabled as of Swift version 6
/host/spi-builder-workspace/Sources/LockTestHelper/main.swift:20:24: error: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state
18 | try withExclusiveWriteLock(at: path, blocking: blocking) {
19 | print("LOCKED_EXCLUSIVE")
20 | fflush(stdout)
| `- error: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state
21 | sleep(UInt32(holdSeconds))
22 | }
/usr/include/stdio.h:144:14: note: var declared here
142 | /* Standard streams. */
143 | extern FILE *stdin; /* Standard input stream. */
144 | extern FILE *stdout; /* Standard output stream. */
| `- note: var declared here
145 | extern FILE *stderr; /* Standard error output stream. */
146 | /* C89/C99 say they're macros. Make them happy. */
/host/spi-builder-workspace/Sources/LockTestHelper/main.swift:26:24: error: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state
24 | try withSharedLock(at: path, blocking: blocking) {
25 | print("LOCKED_SHARED")
26 | fflush(stdout)
| `- error: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state
27 | sleep(UInt32(holdSeconds))
28 | }
/usr/include/stdio.h:144:14: note: var declared here
142 | /* Standard streams. */
143 | extern FILE *stdin; /* Standard input stream. */
144 | extern FILE *stdout; /* Standard output stream. */
| `- note: var declared here
145 | extern FILE *stderr; /* Standard error output stream. */
146 | /* C89/C99 say they're macros. Make them happy. */
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-4606859-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/finestructure/spi-images:basic-6.1-latest swift build --triple x86_64-unknown-linux-gnu 2>&1
basic-6.1-latest: Pulling from finestructure/spi-images
Digest: sha256:4d72617259f6eef9908440c49a67b79bc4f973ae19f78187418ddfb5b178d4ec
Status: Image is up to date for registry.gitlab.com/finestructure/spi-images:basic-6.1-latest
[0/1] Planning build
[1/1] Compiling plugin Swift-DocC Preview
[2/2] Compiling plugin Swift-DocC
Building for debugging...
[2/7] Write swift-version-24593BA9C3E375BF.txt
[4/10] Compiling FlockKit Errno.swift
[5/10] Emitting module FlockKit
[6/10] Compiling FlockKit FlockKit.swift
[8/12] Emitting module LockTestHelper
[9/12] Compiling LockTestHelper main.swift
/host/spi-builder-workspace/Sources/LockTestHelper/main.swift:20:24: error: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state
18 | try withExclusiveWriteLock(at: path, blocking: blocking) {
19 | print("LOCKED_EXCLUSIVE")
20 | fflush(stdout)
| `- error: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state
21 | sleep(UInt32(holdSeconds))
22 | }
/usr/include/stdio.h:144:14: note: var declared here
142 | /* Standard streams. */
143 | extern FILE *stdin; /* Standard input stream. */
144 | extern FILE *stdout; /* Standard output stream. */
| `- note: var declared here
145 | extern FILE *stderr; /* Standard error output stream. */
146 | /* C89/C99 say they're macros. Make them happy. */
/host/spi-builder-workspace/Sources/LockTestHelper/main.swift:26:24: error: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state
24 | try withSharedLock(at: path, blocking: blocking) {
25 | print("LOCKED_SHARED")
26 | fflush(stdout)
| `- error: reference to var 'stdout' is not concurrency-safe because it involves shared mutable state
27 | sleep(UInt32(holdSeconds))
28 | }
/usr/include/stdio.h:144:14: note: var declared here
142 | /* Standard streams. */
143 | extern FILE *stdin; /* Standard input stream. */
144 | extern FILE *stdout; /* Standard output stream. */
| `- note: var declared here
145 | extern FILE *stderr; /* Standard error output stream. */
146 | /* C89/C99 say they're macros. Make them happy. */
BUILD FAILURE 6.1 linux