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On Windows, there are multiple variants of the C runtime that must be explicitly specified and consistently used from the runtime to the application. The new `-libc` option allows us to control the linking phase by correctly embedding the requested library to be linked. It is made into a required parameter on Windows and will add in the appropriate flags for the imported C headers as well. This ensures that the C library is not incorrectly linked.
26 lines
1.3 KiB
Swift
26 lines
1.3 KiB
Swift
// -- check that invalid values are flagged
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// RUN: not %swiftc_driver -target x86_64-unknown-windows-msvc -libc MLd -c %s -### 2>&1 | %FileCheck %s -check-prefix CHECK-INVALID
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// CHECK-INVALID: error: invalid value 'MLd' in '-libc'
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// -- check that cross-compilation still succeeds
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// RUN: %swiftc_driver -target x86_64-unknown-linux-gnu -c %s -###
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// -- check flags for /MD
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// RUN: %swiftc_driver -target x86_64-unknown-windows-msvc -libc MD -c %s -### 2>&1 | %FileCheck %s -check-prefix CHECK-MD
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// CHECK-MD: -autolink-library oldnames -autolink-library msvcrt -Xcc -D_MT -Xcc -D_DLL
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// -- check flags for /MDd
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// RUN: %swiftc_driver -target x86_64-unknown-windows-msvc -libc MDd -c %s -### 2>&1 | %FileCheck %s -check-prefix CHECK-MDd
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// CHECK-MDd: -autolink-library oldnames -autolink-library msvcrtd -Xcc -D_MT -Xcc -D_DLL
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// -- check flags for /MT
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// RUN: %swiftc_driver -target x86_64-unknown-windows-msvc -libc MT -c %s -### 2>&1 | %FileCheck %s -check-prefix CHECK-MT
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// CHECK-MT: -autolink-library oldnames -autolink-library libcmt -Xcc -D_MT
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// CHECK-MT-NOT: -D_DLL
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// -- check flags for /MTd
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// RUN: %swiftc_driver -target x86_64-unknown-windows-msvc -libc MTd -c %s -### 2>&1 | %FileCheck %s -check-prefix CHECK-MTd
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// CHECK-MTd: -autolink-library oldnames -autolink-library libcmtd -Xcc -D_MT
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// CHECK-MTd-NOT: -D_DLL
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