[PATCH] D107682: [AVR][clang] Improve search for avr-libc installation path

[Ben Shi via Phabricator via cfe-commits]

benshi001 updated this revision to Diff 365347.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D107682/new/

https://reviews.llvm.org/D107682

Files:
  clang/lib/Driver/ToolChains/AVR.cpp
  clang/test/Driver/avr-toolchain.c


Index: clang/test/Driver/avr-toolchain.c
===================================================================
--- clang/test/Driver/avr-toolchain.c
+++ clang/test/Driver/avr-toolchain.c
@@ -6,7 +6,7 @@
 // CHECK1-SAME: "-resource-dir" "[[RESOURCE:[^"]+]]"
 // CHECK1-SAME: "-isysroot" "[[SYSROOT:[^"]+/basic_avr_tree]]"
 // CHECK1-SAME: "-internal-isystem"
-// CHECK1-SAME: {{^}} "[[SYSROOT]]/usr/lib/avr/include"
+// CHECK1-SAME: {{^}} "[[SYSROOT]]/usr/lib/gcc/avr/5.4.0/../../../avr/include"
 // CHECK1-NOT:  "-L
 // CHECK1:      avr-ld"
 // CHECK1-SAME: "-o" "a.out"
Index: clang/lib/Driver/ToolChains/AVR.cpp
===================================================================
--- clang/lib/Driver/ToolChains/AVR.cpp
+++ clang/lib/Driver/ToolChains/AVR.cpp
@@ -453,11 +453,21 @@
 }
 
 llvm::Optional<std::string> AVRToolChain::findAVRLibcInstallation() const {
+  // Search avr-libc installation according to avr-gcc installation.
+  std::string GCCParent(GCCInstallation.getParentLibPath());
+  std::string Path(GCCParent + "/avr");
+  if (llvm::sys::fs::is_directory(Path))
+    return Path;
+  Path = GCCParent + "/../avr";
+  if (llvm::sys::fs::is_directory(Path))
+    return Path;
+
+  // Search avr-libc installation from possible locations, and return the first
+  // one that exists, if there is no avr-gcc installed.
   for (StringRef PossiblePath : PossibleAVRLibcLocations) {
     std::string Path = getDriver().SysRoot + PossiblePath.str();
-    // Return the first avr-libc installation that exists.
     if (llvm::sys::fs::is_directory(Path))
-      return Optional<std::string>(Path);
+      return Path;
   }
 
   return llvm::None;


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