Index: COFF/Driver.cpp =================================================================== --- COFF/Driver.cpp +++ COFF/Driver.cpp @@ -414,7 +414,24 @@ } // Windows specific -- find default entry point name. +// +// There are four different entry point functions for Windows executables, +// each of which corresponds to a user-defined "main" function. This function +// infers an entry point from a user-defined "main" function. StringRef LinkerDriver::findDefaultEntry() { + // As a special case, if /nodefaultlib is given, we directly look for an + // entry point. This is because, if no default library is linked, users + // need to define an entry point instead of a "main". + if (Config->NoDefaultLibAll) { + for (StringRef S : {"mainCRTStartup", "wmainCRTStartup", + "WinMainCRTStartup", "wWinMainCRTStartup"}) { + StringRef Entry = Symtab->findMangle(S); + if (!Entry.empty() && !isa(Symtab->find(Entry))) + return mangle(S); + } + return ""; + } + // User-defined main functions and their corresponding entry points. static const char *Entries[][2] = { {"main", "mainCRTStartup"}, Index: test/COFF/entry-inference3.test =================================================================== --- test/COFF/entry-inference3.test +++ test/COFF/entry-inference3.test @@ -0,0 +1,35 @@ +# RUN: yaml2obj < %s > %t.obj +# RUN: not lld-link /out:%t.exe %t.obj /verbose /nodefaultlib > %t.log 2>&1 +# RUN: FileCheck %s < %t.log + +# CHECK: Entry name inferred: mainCRTStartup + +--- !COFF +header: + Machine: IMAGE_FILE_MACHINE_AMD64 + Characteristics: [] +sections: + - Name: .text + Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ] + Alignment: 4 + SectionData: B82A000000C3 +symbols: + - Name: .text + Value: 0 + SectionNumber: 1 + SimpleType: IMAGE_SYM_TYPE_NULL + ComplexType: IMAGE_SYM_DTYPE_NULL + StorageClass: IMAGE_SYM_CLASS_STATIC + SectionDefinition: + Length: 6 + NumberOfRelocations: 0 + NumberOfLinenumbers: 0 + CheckSum: 0 + Number: 0 + - Name: mainCRTStartup + Value: 0 + SectionNumber: 1 + SimpleType: IMAGE_SYM_TYPE_NULL + ComplexType: IMAGE_SYM_DTYPE_NULL + StorageClass: IMAGE_SYM_CLASS_EXTERNAL +...