Index: lib/Analysis/TargetLibraryInfo.cpp =================================================================== --- lib/Analysis/TargetLibraryInfo.cpp +++ lib/Analysis/TargetLibraryInfo.cpp @@ -482,7 +482,7 @@ TLI.setUnavailable(LibFunc_sinhl_finite); } - if (T.isGNUEnvironment() || (T.isAndroid() && !T.isAndroidVersionLT(28))) { + if (T.isOSLinux() || (T.isAndroid() && !T.isAndroidVersionLT(28))) { // available IO unlocked variants on GNU/Linux and Android P or later TLI.setAvailable(LibFunc_getc_unlocked); TLI.setAvailable(LibFunc_getchar_unlocked); Index: test/Transforms/InstCombine/unlocked-stdio-mingw.ll =================================================================== --- /dev/null +++ test/Transforms/InstCombine/unlocked-stdio-mingw.ll @@ -0,0 +1,23 @@ +; NOTE: Assertions have been autogenerated by utils/update_test_checks.py +; RUN: opt < %s -instcombine -S -mtriple=x86_64-w64-mingw32 | FileCheck %s + +%struct._iobuf = type { i8*, i32, i8*, i32, i32, i32, i32, i8* } + +@.str = private unnamed_addr constant [5 x i8] c"file\00", align 1 +@.str.1 = private unnamed_addr constant [2 x i8] c"w\00", align 1 + +; Check that this still uses the plain fputc instead of fputc_unlocked +; for MinGW targets. +define void @external_fputc_test() { +; CHECK-LABEL: @external_fputc_test( +; CHECK-NEXT: [[CALL:%.*]] = call %struct._iobuf* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0)) +; CHECK-NEXT: [[CALL1:%.*]] = call i32 @fputc(i32 99, %struct._iobuf* [[CALL]]) +; CHECK-NEXT: ret void +; + %call = call %struct._iobuf* @fopen(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @.str, i64 0, i64 0), i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str.1, i64 0, i64 0)) + %call1 = call i32 @fputc(i32 99, %struct._iobuf* %call) + ret void +} + +declare %struct._iobuf* @fopen(i8*, i8*) +declare i32 @fputc(i32, %struct._iobuf* nocapture)