zlib – Build Information – Swift Package Index

Build Information

Failed to build zlib, reference main (f1d153), with Swift 6.4 for Wasm on 27 Sep 2026 19:36:07 UTC.

Build Command

bash -c docker run --pull=always --rm -v "checkouts-54344843-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest swift build --swift-sdk swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm 2>&1

Build Log

========================================
RunAll
========================================
Builder version: 5.1.0
Interrupt handler set up.
========================================
Checkout
========================================
Clone URL: https://github.com/the-swift-collective/zlib.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/the-swift-collective/zlib
 * branch            main       -> FETCH_HEAD
 * [new branch]      main       -> origin/main
HEAD is now at f1d153b ci: Bump to Swift 6.1 on Windows to fix SDK bug
Submodule path 'zlib': checked out 'afcd7d6652aaa890e426a22ee327d508783d76c8'
Submodule 'zlib' (https://github.com/the-swift-collective/ZLibC.git) registered for path 'zlib'
Cloning into '/host/spi-builder-workspace/zlib'...
Cloned https://github.com/the-swift-collective/zlib.git
Revision (git rev-parse @):
f1d153b90420f9fcc6ef916cd67ea96f0e68d137
SUCCESS checkout https://github.com/the-swift-collective/zlib.git at main
========================================
Build
========================================
Selected platform:         wasm
Swift version:             6.4
Building package at path:  $PWD
https://github.com/the-swift-collective/zlib.git
Running build ...
bash -c docker run --pull=always --rm -v "checkouts-54344843-1":/host -w "$PWD" -e JAVA_HOME="/root/.sdkman/candidates/java/current" -e SPI_BUILD="1" -e SPI_PROCESSING="1" registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest swift build --swift-sdk swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm 2>&1
wasm-6.4-latest: Pulling from saguaro1/spi-images
Digest: sha256:4328fdb43c680d205c1d6761b1e3267aa38277eefdda9ddfb17b6a0f1a77857a
Status: Image is up to date for registry.gitlab.com/saguaro1/spi-images:wasm-6.4-latest
Building for debugging...
[Pre-planning 1 / 125]
[27 / 44] ZLibC
[1m/host/spi-builder-workspace/zlib/gzlib.c:245:9: [0m[0;1;31merror: [0m[1mcall to undeclared function 'lseek'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration][0m
  245 |         LSEEK(state->fd, [0;32m0[0m, SEEK_END);  [0;33m/* so gzoffset() is correct */[0m
      | [0;1;32m        ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:15:17: [0m[0;1;36mnote: [0mexpanded from macro 'LSEEK'[0m
   15 | #  define LSEEK lseek[0m
      | [0;1;32m                ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:245:9: [0m[0;1;36mnote: [0mdid you mean 'fseek'?[0m
[1m/host/spi-builder-workspace/zlib/gzlib.c:15:17: [0m[0;1;36mnote: [0mexpanded from macro 'LSEEK'[0m
   15 | #  define LSEEK lseek[0m
      | [0;1;32m                ^
[0mIn file included from /host/spi-builder-workspace/zlib/gzlib.c:6:
In file included from /host/spi-builder-workspace/zlib/gzguts.h:32:
[1m/root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/WASI.sdk/include/wasm32-wasip1/stdio.h:95:5: [0m[0;1;36mnote: [0m'fseek' declared here[0m
   95 | [0;34mint[0m fseek(FILE *, [0;34mlong[0m, [0;34mint[0m);[0m
      | [0;1;32m    ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:251:24: [0m[0;1;31merror: [0m[1mcall to undeclared function 'lseek'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration][0m
  251 |         state->start = LSEEK(state->fd, [0;32m0[0m, SEEK_CUR);[0m
      | [0;1;32m                       ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:15:17: [0m[0;1;36mnote: [0mexpanded from macro 'LSEEK'[0m
   15 | #  define LSEEK lseek[0m
      | [0;1;32m                ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:335:9: [0m[0;1;31merror: [0m[1mcall to undeclared function 'lseek'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration][0m
  335 |     [0;34mif[0m (LSEEK(state->fd, state->start, SEEK_SET) == -[0;32m1[0m)[0m
      | [0;1;32m        ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:15:17: [0m[0;1;36mnote: [0mexpanded from macro 'LSEEK'[0m
   15 | #  define LSEEK lseek[0m
      | [0;1;32m                ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:372:15: [0m[0;1;31merror: [0m[1mcall to undeclared function 'lseek'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration][0m
  372 |         ret = LSEEK(state->fd, offset - (z_off64_t)state->x.have, SEEK_CUR);[0m
      | [0;1;32m              ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:15:17: [0m[0;1;36mnote: [0mexpanded from macro 'LSEEK'[0m
   15 | #  define LSEEK lseek[0m
      | [0;1;32m                ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:458:14: [0m[0;1;31merror: [0m[1mcall to undeclared function 'lseek'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration][0m
  458 |     offset = LSEEK(state->fd, [0;32m0[0m, SEEK_CUR);[0m
      | [0;1;32m             ^
[0m[1m/host/spi-builder-workspace/zlib/gzlib.c:15:17: [0m[0;1;36mnote: [0mexpanded from macro 'LSEEK'[0m
   15 | #  define LSEEK lseek[0m
      | [0;1;32m                ^
[0m5 errors generated.
error: CompileC /host/spi-builder-workspace/.build/out/Intermediates.noindex/zlib.build/Debug-webassembly-wasm32/ZLibC-t.build/Objects-normal/wasm32/gzlib.o /host/spi-builder-workspace/zlib/gzlib.c normal wasm32 c com.apple.compilers.llvm.clang.1_0.compiler failed with a nonzero exit code. Command line:     cd /host

    Using response file: /host/spi-builder-workspace/.build/out/Intermediates.noindex/zlib.build/Debug-webassembly-wasm32/ZLibC-t.build/Objects-normal/wasm32/9f65232cb83f8421e3a495a5062eba382369c975104ee97bafc405ab795bfc5e-common-args.resp

    /usr/bin/clang -x c -target wasm32-unknown-wasip1 -fmessage-length\=0 -fdiagnostics-show-note-include-stack -fmacro-backtrace-limit\=0 -fcolor-diagnostics -Wno-trigraphs -Wno-missing-field-initializers -Wno-missing-prototypes -Wno-return-type -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 -Wno-shorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-implicit-fallthrough -fstrict-aliasing -Wdeprecated-declarations -Wno-sign-conversion -Wno-infinite-recursion -Wno-comma -Wno-block-capture-autoreleasing -Wno-strict-prototypes -Wno-semicolon-before-method-body --sysroot /root/.swiftpm/swift-sdks/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm.artifactbundle/swift-6.4.x-DEVELOPMENT-SNAPSHOT-2026-09-04-a_wasm/wasm32-unknown-wasip1/WASI.sdk @/host/spi-builder-workspace/.build/out/Intermediates.noindex/zlib.build/Debug-webassembly-wasm32/ZLibC-t.build/Objects-normal/wasm32/9f65232cb83f8421e3a495a5062eba382369c975104ee97bafc405ab795bfc5e-common-args.resp -MMD -MT dependencies -MF /host/spi-builder-workspace/.build/out/Intermediates.noindex/zlib.build/Debug-webassembly-wasm32/ZLibC-t.build/Objects-normal/wasm32/gzlib.d --serialize-diagnostics /host/spi-builder-workspace/.build/out/Intermediates.noindex/zlib.build/Debug-webassembly-wasm32/ZLibC-t.build/Objects-normal/wasm32/gzlib.dia -c /host/spi-builder-workspace/zlib/gzlib.c -o /host/spi-builder-workspace/.build/out/Intermediates.noindex/zlib.build/Debug-webassembly-wasm32/ZLibC-t.build/Objects-normal/wasm32/gzlib.o
error: Build failed
BUILD FAILURE 6.4 wasm