Revert r371729: lld-link: Make /linkrepro: take a filename, not a directory.

[ruiu]

Summary

This reverts commit r371729 because /linkrepro option also exists
in Microsoft link.exe and their linker takes not a filename but a
directory name as an argument for /linkrepro.

[ruiu]

• fix lld/test/COFF/linkrepro-pdb.test

[mstorsjo]

Sounds sensible to me.

lld/COFF/Driver.cpp

 #include "llvm/ToolDrivers/llvm-lib/LibDriver.h"
 #include <algorithm>
 #include <future>
 #include <memory>
 
 using namespace llvm;
 using namespace llvm::object;
 using namespace llvm::COFF;
-using namespace llvm::sys;
+using llvm::sys::Process;
 
 namespace lld {
 namespace coff {
 
 static Timer inputFileTimer("Input File Reading", Timer::root());
 
 Configuration *config;
 LinkerDriver *driver;
if (args.hasArg(OPT_dash_dash_version)) {
     return;
   }
 
   // Handle /lldmingw early, since it can potentially affect how other
   // options are handled.
   config->mingw = args.hasArg(OPT_lldmingw);
 
   if (auto *arg = args.getLastArg(OPT_linkrepro)) {
-    const char *path = arg->getValue();
+    SmallString<64> path = StringRef(arg->getValue());
+    sys::path::append(path, "repro.tar");
 
     Expected<std::unique_ptr<TarWriter>> errOrWriter =
-        TarWriter::create(path, path::stem(path));
+        TarWriter::create(path, "repro");
+
     if (errOrWriter) {
       tar = std::move(*errOrWriter);
-      tar->append("version.txt", getLLDVersion() + "\n");
     } else {
-      error("/linkrepro: " + toString(errOrWriter.takeError()));
+      error("/linkrepro: failed to open " + path + ": " +
+            toString(errOrWriter.takeError()));
     }
   }
 
   if (!args.hasArg(OPT_INPUT)) {
     if (args.hasArg(OPT_deffile))
       config->noEntry = true;
     else
       fatal("no input files");

lld/docs/ReleaseNotes.rst

 ELF Improvements
 ----------------
 
 * ...
 
 COFF Improvements
 -----------------
 
-* /linkrepro: now takes the filename of the tar archive it writes, instead
-  of the name of a directory that a file called "repro.tar" is created in,
-  matching the behavior of ELF lld.
-* The new `/lldignoreenv` flag makes lld-link ignore environment variables
-  like `%LIB%`.
 * ...
 
 MinGW Improvements
 ------------------
 
 * ...
 
 MachO Improvements

lld/test/COFF/linkrepro-res.test

 # REQUIRES: x86, shell
 
 # RUN: rm -rf %t.dir
 # RUN: mkdir -p %t.dir/build
 # RUN: cd %t.dir/build
 # RUN: lld-link %p/Inputs/resource.res /subsystem:console /machine:x64 \
-# RUN:   /entry:__ImageBase /linkrepro:repro.tar /out:%t.exe
+# RUN:   /entry:__ImageBase /linkrepro:. /out:%t.exe
 # RUN: tar xf repro.tar
 # RUN: diff %p/Inputs/resource.res repro/%:p/Inputs/resource.res
 # RUN: FileCheck %s --check-prefix=RSP < repro/response.txt
 
 # RSP: resource.res

lld/test/COFF/linkrepro.test

 # REQUIRES: x86, shell
 
 # RUN: rm -rf %t.dir
 # RUN: mkdir -p %t.dir/build1 %t.dir/build2 %t.dir/build3
 # RUN: yaml2obj < %p/Inputs/hello32.yaml > %t.obj
 
 # RUN: cd %t.dir/build1
 # RUN: lld-link %t.obj %p/Inputs/std32.lib /subsystem:console \
-# RUN:   /entry:main@0 /linkrepro:repro.tar /out:%t.exe
+# RUN:   /entry:main@0 /linkrepro:. /out:%t.exe
 # RUN: tar xf repro.tar
 # RUN: diff %t.obj repro/%:t.obj
 # RUN: diff %p/Inputs/std32.lib repro/%:p/Inputs/std32.lib
 # RUN: FileCheck %s --check-prefix=RSP < repro/response.txt
 
 # RUN: cd %t.dir/build2
 # RUN: lld-link %t.obj /libpath:%p/Inputs /defaultlib:std32 /subsystem:console \
-# RUN:   /entry:main@0 /linkrepro:repro.tar /out:%t.exe
+# RUN:   /entry:main@0 /linkrepro:. /out:%t.exe
 # RUN: tar xf repro.tar
 # RUN: diff %t.obj repro/%:t.obj
 # RUN: diff %p/Inputs/std32.lib repro/%:p/Inputs/std32.lib
 # RUN: FileCheck %s --check-prefix=RSP < repro/response.txt
 
 # RUN: cd %t.dir/build3
 # RUN: env LIB=%p/Inputs lld-link %t.obj /defaultlib:std32 /subsystem:console \
-# RUN:   /entry:main@0 /linkrepro:repro.tar /out:%t.exe
+# RUN:   /entry:main@0 /linkrepro:. /out:%t.exe
 # RUN: tar xf repro.tar
 # RUN: diff %t.obj repro/%:t.obj
 # RUN: diff %p/Inputs/std32.lib repro/%:p/Inputs/std32.lib
 # RUN: FileCheck %s --check-prefix=RSP < repro/response.txt
 
 # RSP: /subsystem:console
 # RSP: /entry:main@0
 # RSP-NOT: /linkrepro:
 # RSP: /out:
 # RSP: linkrepro.test.tmp.obj
 # RSP-NOT: defaultlib
 # RSP: std32.lib