Legacy C++ driver treats static libraries as source files with WMO enabled

[stevapple]

Description
swiftc (with legacy driver) unexpectedly treats static libraries as source files with -wmo flag, so it emits error diagnostics.

Steps to reproduce

// Module.swift
public func hello() {}

// main.swift
import Module
hello()

Windows：

1. Run swiftc -emit-module -emit-library Module.swift;
2. Run swiftc -disallow-use-new-driver -wmo -I. main.swift Module.lib.

Unix:

1. Run swiftc -emit-module -emit-library -static Module.swift;
2. Run swiftc -disallow-use-new-driver -wmo -I. main.swift libModule.a.

Expected behavior
This should run successfully with or without -wmo.

Environment
Swift version 5.9-dev (LLVM 230b7b8312a62d8, Swift 5ca8989242af5af)

Additional context
This is found when building swift-corelibs-libdispatch on Windows with CMake 3.26.0, which enables WMO for release build by default.

[compnerd]

@stevapple interesting; would you mind sharing the full output of the error? I wonder what the Windows specific thing is here.

[stevapple]

@stevapple interesting; would you mind sharing the full output of the error? I wonder what the Windows specific thing is here.

Maybe it's not Windows-specific, but at least this blocks me from building a Windows toolchain:(

[stevapple]

The error output is quite boring though, as it's just struggling to parse COFF as Swift.

.\Module.lib:1:1: error: expressions are not allowed at the top level
!<arch>
^
.\Module.lib:2:19: error: consecutive statements on a line must be separated by ';'
/               -1                      0       144       `
                  ^
                  ;
.\Module.lib:2:41: error: expressions are not allowed at the top level
/               -1                      0       144       `
                                        ^
.\Module.lib:2:42: error: consecutive statements on a line must be separated by ';'
/               -1                      0       144       `
                                         ^
                                         ;
.\Module.lib:2:49: error: expressions are not allowed at the top level
/               -1                      0       144       `
                                                ^
.\Module.lib:2:52: error: consecutive statements on a line must be separated by ';'
/               -1                      0       144       `
                                                   ^
                                                   ;
.\Module.lib:2:59: error: expected expression
/               -1                      0       144       `
                                                          ^
.\Module.lib:3:1: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:2: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:3: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:4: error: invalid character in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:5: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:6: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:7: error: invalid character in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:8: error: invalid UTF-8 found in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:9: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:10: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:11: error: invalid character in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:12: error: invalid UTF-8 found in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:13: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:14: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:15: error: invalid character in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:16: error: invalid character in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:17: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:18: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:19: error: invalid character in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:21: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:22: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:23: error: invalid character in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:51: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:76: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:77: error: invalid character in source file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:100: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:119: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:3:144: warning: nul character embedded in middle of file
��?�?���^�^__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTORModule_NULL_THUNK_DATA$s6Module5helloyyF__imp_$s6Module5helloyyF/               -1                      0       154       `
.\Module.lib:4:1: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Modudule__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:2: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:3: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:4: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:5: error: invalid UTF-8 found in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:6: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:7: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:8: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:9: error: invalid UTF-8 found in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:10: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:11: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:12: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:13: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:14: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:15: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:16: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:18: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490                     0       490       `
.\Module.lib:4:19: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:20: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:21: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:22: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:23: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:24: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:25: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:26: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:27: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:28: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:29: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:30: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:31: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:32: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:33: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:34: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:53: warning: nul character embedded in middle ol character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:80: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:105: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:130: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:131: error: invalid character in source file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:4:154: warning: nul character embedded in middle of file
�??��^�������$s6Module5helloyyF__IMPORT_DESCRIPTOR_Module__NULL_IMPORT_DESCRIPTOR__imp_$s6Module5helloyyFModule_NULL_THUNK_DATAModule.dll/     -1                      0       490       `
.\Module.lib:5:2: error: invalid UTF-8 found in source file
d?YW>?
.\Module.lib:5:3: error: invalid character in source file
d?YW>?
.\Module.lib:5:4: warning: nul character embedded in middle of file
d?YW>?
.\Module.lib:5:8: error: invalid UTF-8 found in source file
d?YW>?
.\Module.lib:6:1: error: invalid character in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:2: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:3: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:4: error: invalid character in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:5: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:6: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:7: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:8: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:9: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:10: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:11: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:20: warning: nul character embedded in middle of file
.debug$Se of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:21: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:22: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:23: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:24: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:25: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:26: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:27: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:29: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:30: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:31: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:32: error: invalid UTF-8 found in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:33: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:34: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:35: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:36: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:37: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:38: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:39: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:40: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:41: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:42: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:43: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:44: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:45: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:46: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:47: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:49: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:50: error: invalid character in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:60: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:61: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:62: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:63: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:64: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:65: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:66: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:67: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:68: error: invalid character in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:69: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:70: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:71: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ 0?idata$6
??@ ?�
.\Module.lib:6:72: error: invalid UTF-8 found in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:73: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:74: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:75: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:76: error: invalid UTF-8 found in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:77: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:78: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:79: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:80: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:81: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:82: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:83: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:84: error: invalid character in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:85: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:86: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:87: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:89: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:91: error: invalid UTF-8 found in source file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:100: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:101: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
odule.lib:6:102: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:103: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:104: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:105: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:106: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:107: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:109: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:110: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:111: warning: nul character embedded in middle of file
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:6:112: error: input files must be encoded as UTF-8 instead of UTF-16
.debug$S@?@�B.idata$2�??�@0?idata$6
??@ ?�
.\Module.lib:1:1: error: cannot find operator '!<' in scope
!<arch>
^~
.\Module.lib:1:7: error: '>' is not a postfix unary operator
!<arch>
      ^
.\Module.lib:1:3: error: cannot find 'arch' in scope
!<arch>
  ^~~~
.\Module.lib:2:41: warning: integer literal is unused
/               -1                      0       144       `
                                        ^
.\Module.lib:2:49: warning: integer literal is unused
/               -1                      0       144       `
                                                ^~~
           ^~~

[compnerd]

CC: @etcwilde

[compnerd]

Hmm, which driver is being used there @stevapple? The C++ or Swift one? The distributed toolchain only has the Swift one.

[stevapple]

I'm building a fresh toolchain from scratch, so this is the C++ one. This may not be a driver issue though, I'm not quite sure which part of the compiler is resposible for judging if an input is object file or source file.

[etcwilde]

That would be the driver. Yeah, the Swift driver on macOS seems to be working correctly. We're trying a mini test on Windows now.

CMakeLists.txt:

cmake_minimum_required(VERSION 3.26)

project(test LANGUAGES Swift)

add_library(A STATIC lib.swift)

add_executable(exec exec.swift)
target_link_libraries(exec PRIVATE A)

exec.swift:

import A

print(ident(x: 10))
print(ident(x: "Hello"))

lib.swift:

public func ident<T>(x: T) -> T { x }

@stevapple Can you try building with these files and ensure that they reproduce the failure? Thanks.

[stevapple]

Okay so this seems a long-existing bug, shown by new experiments that disables the new driver on previous snapshots. It happens to boom because CMake 3.26.0 makes -wmo the default and we have to use the legacy driver for core libraries.

[etcwilde]

This could be an issue in the C++ driver since it's in the toolchain and Windows doesn't have the "early-swift-driver" since there is no swift toolchain pre-installed in the build.

[stevapple]

@etcwilde Boomed as expected

[2/2] Linking Swift executable exec.exe
FAILED: exec.exe CMakeFiles/exec.dir/exec.swift.obj
cmd.exe /C "cd . && T:\1\bin\swiftc.exe -j 8 -num-threads 8 -emit-executable -o exec.exe -emit-dependencies  -O -wmo -output-file-map CMakeFiles\exec.dir\Release\output-file-map.json -O -wmo -I C:\Users\stevapple\bugreprod\build C:\Users\stevapple\bugreprod\exec.swift  -L C:\Users\stevapple\bugreprod\build A.lib && cd ."

[etcwilde]

I think that means you're using the swift-swift-driver and still experiencing the failure. Is there more to the error, like above with invalid characters?

[etcwilde]

Just for kicks, from your build directory, can you run:

T:\1\bin\swiftc.exe -j 8 -num-threads 8 -emit-executable -o exec.exe -emit-dependencies  -O -wmo -output-file-map CMakeFiles\exec.dir\Release\output-file-map.json -O -wmo -I C:\Users\stevapple\bugreprod\build C:\Users\stevapple\bugreprod\exec.swift  -L C:\Users\stevapple\bugreprod\build A.lib -###

I'd like to verify what the driver thinks it's doing.