Index: lld/trunk/COFF/Config.h =================================================================== --- lld/trunk/COFF/Config.h +++ lld/trunk/COFF/Config.h @@ -190,6 +190,9 @@ // Used for /thinlto-object-suffix-replace: std::pair thinLTOObjectSuffixReplace; + // Used for /lto-obj-path: + llvm::StringRef ltoObjPath; + uint64_t align = 4096; uint64_t imageBase = -1; uint64_t fileAlign = 512; Index: lld/trunk/COFF/Driver.cpp =================================================================== --- lld/trunk/COFF/Driver.cpp +++ lld/trunk/COFF/Driver.cpp @@ -1475,6 +1475,7 @@ getOldNewOptions(args, OPT_thinlto_prefix_replace); config->thinLTOObjectSuffixReplace = getOldNewOptions(args, OPT_thinlto_object_suffix_replace); + config->ltoObjPath = args.getLastArgValue(OPT_lto_obj_path); // Handle miscellaneous boolean flags. config->allowBind = args.hasFlag(OPT_allowbind, OPT_allowbind_no, true); config->allowIsolation = Index: lld/trunk/COFF/LTO.cpp =================================================================== --- lld/trunk/COFF/LTO.cpp +++ lld/trunk/COFF/LTO.cpp @@ -177,6 +177,8 @@ // files. After that, we exit from linker and ThinLTO backend runs in a // distributed environment. if (config->thinLTOIndexOnly) { + if (!config->ltoObjPath.empty()) + saveBuffer(buf[0], config->ltoObjPath); if (indexFile) indexFile->close(); return {}; Index: lld/trunk/COFF/Options.td =================================================================== --- lld/trunk/COFF/Options.td +++ lld/trunk/COFF/Options.td @@ -191,6 +191,9 @@ def thinlto_prefix_replace: P< "thinlto-prefix-replace", "'old;new' replace old prefix with new prefix in ThinLTO outputs">; +def lto_obj_path : P< + "lto-obj-path", + "output native object for merged LTO unit to this path">; def dash_dash_version : Flag<["--"], "version">, HelpText<"Print version information">; defm threads: B<"threads", Index: lld/trunk/test/COFF/lto-obj-path.ll =================================================================== --- lld/trunk/test/COFF/lto-obj-path.ll +++ lld/trunk/test/COFF/lto-obj-path.ll @@ -0,0 +1,25 @@ +; REQUIRES: x86 + +; Test to ensure that thinlto-index-only with lto-obj-path creates +; the native object file. +; RUN: opt -module-summary %s -o %t1.obj +; RUN: opt -module-summary %p/Inputs/thinlto.ll -o %t2.obj +; RUN: rm -f %t4.obj +; RUN: lld-link -thinlto-index-only -lto-obj-path:%t4.obj -out:t3.exe \ +; RUN: -entry:main %t1.obj %t2.obj +; RUN: llvm-readobj -h %t4.obj | FileCheck %s +; RUN: llvm-nm %t4.obj 2>&1 | FileCheck %s -check-prefix=SYMBOLS +; RUN: llvm-nm %t4.obj 2>&1 | count 1 + +; CHECK: Format: COFF-x86-64 +; SYMBOLS: @feat.00 + +target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128" +target triple = "x86_64-pc-windows-msvc19.0.24215" + +declare void @g(...) + +define void @main() { + call void (...) @g() + ret void +}