From: Petr Hosek <phosek@chromium.org>
Date: Wed, 12 Sep 2018 03:26:10 +0000 (+0000)
Subject: [Driver] Search LibraryPaths when handling -print-file-name
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=6208c64db7c27006797384d9550f2b0f9deb97ea;p=clang

[Driver] Search LibraryPaths when handling -print-file-name

This is necessary to handle the multiarch runtime directories.

Differential Revision: https://reviews.llvm.org/D51573

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@342021 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Driver/Driver.cpp b/lib/Driver/Driver.cpp
index 4764d4e38d..e84c7558e7 100644
--- a/lib/Driver/Driver.cpp
+++ b/lib/Driver/Driver.cpp
@@ -4152,16 +4152,24 @@ const char *Driver::GetNamedOutputPath(Compilation &C, const JobAction &JA,
 }
 
 std::string Driver::GetFilePath(StringRef Name, const ToolChain &TC) const {
-  // Respect a limited subset of the '-Bprefix' functionality in GCC by
-  // attempting to use this prefix when looking for file paths.
-  for (const std::string &Dir : PrefixDirs) {
-    if (Dir.empty())
-      continue;
-    SmallString<128> P(Dir[0] == '=' ? SysRoot + Dir.substr(1) : Dir);
-    llvm::sys::path::append(P, Name);
-    if (llvm::sys::fs::exists(Twine(P)))
-      return P.str();
-  }
+  // Seach for Name in a list of paths.
+  auto SearchPaths = [&](const llvm::SmallVectorImpl<std::string> &P)
+      -> llvm::Optional<std::string> {
+    // Respect a limited subset of the '-Bprefix' functionality in GCC by
+    // attempting to use this prefix when looking for file paths.
+    for (const auto &Dir : P) {
+      if (Dir.empty())
+        continue;
+      SmallString<128> P(Dir[0] == '=' ? SysRoot + Dir.substr(1) : Dir);
+      llvm::sys::path::append(P, Name);
+      if (llvm::sys::fs::exists(Twine(P)))
+        return {P.str()};
+    }
+    return None;
+  };
+
+  if (auto P = SearchPaths(PrefixDirs))
+    return *P;
 
   SmallString<128> R(ResourceDir);
   llvm::sys::path::append(R, Name);
@@ -4173,14 +4181,11 @@ std::string Driver::GetFilePath(StringRef Name, const ToolChain &TC) const {
   if (llvm::sys::fs::exists(Twine(P)))
     return P.str();
 
-  for (const std::string &Dir : TC.getFilePaths()) {
-    if (Dir.empty())
-      continue;
-    SmallString<128> P(Dir[0] == '=' ? SysRoot + Dir.substr(1) : Dir);
-    llvm::sys::path::append(P, Name);
-    if (llvm::sys::fs::exists(Twine(P)))
-      return P.str();
-  }
+  if (auto P = SearchPaths(TC.getLibraryPaths()))
+    return *P;
+
+  if (auto P = SearchPaths(TC.getFilePaths()))
+    return *P;
 
   return Name;
 }
diff --git a/test/Driver/linux-per-target-runtime-dir.c b/test/Driver/linux-per-target-runtime-dir.c
index aa9c1017f6..bbd11570f5 100644
--- a/test/Driver/linux-per-target-runtime-dir.c
+++ b/test/Driver/linux-per-target-runtime-dir.c
@@ -19,3 +19,9 @@
 // RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
 // RUN:   | FileCheck --check-prefix=CHECK-CLANGRT-X8664 %s
 // CHECK-CLANGRT-X8664: x86_64-linux-gnu{{/|\\}}lib{{/|\\}}libclang_rt.builtins.a
+
+// RUN: %clang -rtlib=compiler-rt -print-file-name=libclang_rt.builtins.a 2>&1 \
+// RUN:     --target=x86_64-linux-gnu \
+// RUN:     -resource-dir=%S/Inputs/resource_dir_with_per_target_subdir \
+// RUN:   | FileCheck --check-prefix=CHECK-FILE-NAME-X8664 %s
+// CHECK-FILE-NAME-X8664: x86_64-linux-gnu{{/|\\}}lib{{/|\\}}libclang_rt.builtins.a