Use / instead of \ on windows created cpio files

Otherwise when extracting these files on a unix system one
ends up with files named like "repro\bar\foo.o".

llvm-svn: 274622

lld/ELF/DriverUtils.cpp

@@ -152,6 +152,11 @@ void CpioFile::append(StringRef Path, StringRef Data) {
   // (i.e. in that case we are creating baz.cpio.)
   SmallString<128> Fullpath;
   path::append(Fullpath, Basename, Path);
+
+  // Use unix path separators so the cpio can be extracted on both unix and
+  // windows.
+  std::replace(Fullpath.begin(), Fullpath.end(), '\\', '/');
+
   writeMember(*OS, Fullpath, Data);
 
   // Print the trailer and seek back.

lld/test/ELF/reproduce-windows.s

@@ -6,5 +6,7 @@
 # RUN: llvm-mc %s -o %t.dir/build/foo.o -filetype=obj -triple=x86_64-pc-linux
 # RUN: cd %t.dir
 # RUN: not ld.lld build/foo.o --reproduce repro
-# RUN: cpio -t < repro.cpio | grep -F 'repro\response.txt'
-# RUN: cpio -t < repro.cpio | grep -F 'repro\%:t.dir\build\foo.o'
+# RUN: cpio -t < repro.cpio | FileCheck %s
+
+# CHECK: repro/response.txt
+# CHECK: repro/{{.*}}/build/foo.o