Backport of upstream commit 555b572e3f407ac48b5f30fc06760cc4d0549977
From: Fangrui Song <i@maskray.me>
Date: Wed, 8 Mar 2023 10:18:40 -0800
Subject: [PATCH] Revert D118493 "Set rpath on openmp executables"

This reverts commit 9b9d08111b618d74574ba03e5cc3d752ecc56f55.
(Accepted by Jon https://reviews.llvm.org/D118493#4178250)

libc++, libc++abi, libunwind, and compiler-rt don't add the extra DT_RUNPATH,
it's strange for OpenMP to diverge.
Some build systems want to handle DT_RUNPATH themselves (e.g.
CMAKE_INSTALL_RPATH). Some distributions (e.g. Fedora) have policies against
DT_RUNPATH and the default DT_RUNPATH for OpenMP is causing trouble.

For users who don't want to specify rpath by themselves,
https://clang.llvm.org/docs/UsersManual.html#configuration-files
can be used to specify the default rpath, e.g.
specify -frtlib-add-rpath or -Wl,-rpath in bin/clang.cfg
---
 clang/include/clang/Driver/Options.td      |  6 ------
 clang/lib/Driver/ToolChains/CommonArgs.cpp | 19 -------------------
 clang/lib/Driver/ToolChains/CommonArgs.h   |  3 ---
 clang/test/OpenMP/Inputs/libomp.a          |  1 -
 4 files changed, 29 deletions(-)
 delete mode 100644 clang/test/OpenMP/Inputs/libomp.a

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 3cab37b..b8bc969 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4112,11 +4112,6 @@ def frtlib_add_rpath: Flag<["-"], "frtlib-add-rpath">, Flags<[NoArgumentUnused]>
   HelpText<"Add -rpath with architecture-specific resource directory to the linker flags">;
 def fno_rtlib_add_rpath: Flag<["-"], "fno-rtlib-add-rpath">, Flags<[NoArgumentUnused]>,
   HelpText<"Do not add -rpath with architecture-specific resource directory to the linker flags">;
-defm openmp_implicit_rpath: BoolFOption<"openmp-implicit-rpath",
-  LangOpts<"OpenMP">,
-  DefaultTrue,
-  PosFlag<SetTrue, [], "Set rpath on OpenMP executables">,
-  NegFlag<SetFalse>>;
 def r : Flag<["-"], "r">, Flags<[LinkerInput,NoArgumentUnused]>,
         Group<Link_Group>;
 def save_temps_EQ : Joined<["-", "--"], "save-temps=">, Flags<[CC1Option, FlangOption, NoXarchOption]>,
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.cpp b/clang/lib/Driver/ToolChains/CommonArgs.cpp
index 443725f..19ac699 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.cpp
+++ b/clang/lib/Driver/ToolChains/CommonArgs.cpp
@@ -646,22 +646,6 @@ void tools::addLTOOptions(const ToolChain &ToolChain, const ArgList &Args,
                          /*IsLTO=*/true);
 }
 
-void tools::addOpenMPRuntimeSpecificRPath(const ToolChain &TC,
-                                          const ArgList &Args,
-                                          ArgStringList &CmdArgs) {
-
-  if (Args.hasFlag(options::OPT_fopenmp_implicit_rpath,
-                   options::OPT_fno_openmp_implicit_rpath, true)) {
-    // Default to clang lib / lib64 folder, i.e. the same location as device
-    // runtime
-    SmallString<256> DefaultLibPath =
-        llvm::sys::path::parent_path(TC.getDriver().Dir);
-    llvm::sys::path::append(DefaultLibPath, Twine("lib") + CLANG_LIBDIR_SUFFIX);
-    CmdArgs.push_back("-rpath");
-    CmdArgs.push_back(Args.MakeArgString(DefaultLibPath));
-  }
-}
-
 void tools::addOpenMPRuntimeLibraryPath(const ToolChain &TC,
                                         const ArgList &Args,
                                         ArgStringList &CmdArgs) {
@@ -733,9 +717,6 @@ bool tools::addOpenMPRuntime(ArgStringList &CmdArgs, const ToolChain &TC,
     CmdArgs.push_back("-lomptarget.devicertl");
 
   addArchSpecificRPath(TC, Args, CmdArgs);
-
-  if (RTKind == Driver::OMPRT_OMP)
-    addOpenMPRuntimeSpecificRPath(TC, Args, CmdArgs);
   addOpenMPRuntimeLibraryPath(TC, Args, CmdArgs);
 
   return true;
diff --git a/clang/lib/Driver/ToolChains/CommonArgs.h b/clang/lib/Driver/ToolChains/CommonArgs.h
index d44d9214c08b..e64e9524601d 100644
--- a/clang/lib/Driver/ToolChains/CommonArgs.h
+++ b/clang/lib/Driver/ToolChains/CommonArgs.h
@@ -117,9 +117,6 @@ void AddAssemblerKPIC(const ToolChain &ToolChain,
                       const llvm::opt::ArgList &Args,
                       llvm::opt::ArgStringList &CmdArgs);
 
-void addOpenMPRuntimeSpecificRPath(const ToolChain &TC,
-                                   const llvm::opt::ArgList &Args,
-                                   llvm::opt::ArgStringList &CmdArgs);
 void addArchSpecificRPath(const ToolChain &TC, const llvm::opt::ArgList &Args,
                           llvm::opt::ArgStringList &CmdArgs);
 void addOpenMPRuntimeLibraryPath(const ToolChain &TC,
diff --git a/clang/test/OpenMP/Inputs/libomp.a b/clang/test/OpenMP/Inputs/libomp.a
deleted file mode 100644
index 8b277f0dd5dc..000000000000
--- a/clang/test/OpenMP/Inputs/libomp.a
+++ /dev/null
@@ -1 +0,0 @@
-!<arch>