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[ClangImporter] Swift needs to pass -Xclang -fbuiltin-headers-in-system-modules for its module maps that group cstd headers

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Swift has some module maps it overlays on Linux and Windows that groups all of the C standard library headers into a single module. This doesn’t allow clang and C++ headers to layer properly with the OS/SDK modules. clang will set -fbuiltin-headers-in-system-modules as necessary for Apple SDKs, but Swift will need to pass that flag itself when required by its module maps.
This commit is contained in:
Ian Anderson
2023-12-07 22:24:13 -08:00
parent a076d54769
commit 94e860e795
13 changed files with 98 additions and 17 deletions
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5
stdlib/public/Backtracing/SymbolicatedBacktrace.swift
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@@ -23,6 +23,11 @@ import Swift
@_implementationOnly import OS.Libc
@_implementationOnly import Runtime
// Because we've turned off the OS/SDK modules, and we don't have a module for
// stddef.h, and we sometimes build with -fbuiltin-headers-in-system-modules for
// vfs reasons, stddef.h can be absorbed into a random module. Sometimes it's
// SwiftOverlayShims.
@_implementationOnly import SwiftOverlayShims
/// A symbolicated backtrace
public struct SymbolicatedBacktrace: CustomStringConvertible {