[ELF] Determine default search directories from Context.

Target specific LinkingContext's  determine the default search directory.

No change in functionality.

llvm-svn: 227784

lld/include/lld/Driver/Driver.h

@@ -87,10 +87,6 @@ private:
   static bool applyEmulation(llvm::Triple &triple,
                              llvm::opt::InputArgList &args,
                              raw_ostream &diag);
-  static void addPlatformSearchDirs(ELFLinkingContext &ctx,
-                                    llvm::Triple &triple,
-                                    llvm::Triple &baseTriple);
-
   GnuLdDriver() LLVM_DELETED_FUNCTION;
 };
 

lld/include/lld/ReaderWriter/ELFLinkingContext.h

@@ -291,6 +291,11 @@ public:
   bool alignSegments() const { return _alignSegments; }
   void setAlignSegments(bool align) { _alignSegments = align; }
 
+  /// \brief add platform specific search directories.
+  virtual void addDefaultSearchDirs(llvm::Triple & /*triple*/) {
+    addSearchPath("=/usr/lib");
+  }
+
 private:
   ELFLinkingContext() LLVM_DELETED_FUNCTION;
 

lld/lib/Driver/GnuLdDriver.cpp

@@ -311,18 +311,6 @@ bool GnuLdDriver::applyEmulation(llvm::Triple &triple,
   return true;
 }
 
-void GnuLdDriver::addPlatformSearchDirs(ELFLinkingContext &ctx,
-                                       llvm::Triple &triple,
-                                       llvm::Triple &baseTriple) {
-  if (triple.getOS() == llvm::Triple::NetBSD &&
-      triple.getArch() == llvm::Triple::x86 &&
-      baseTriple.getArch() == llvm::Triple::x86_64) {
-    ctx.addSearchPath("=/usr/lib/i386");
-    return;
-  }
-  ctx.addSearchPath("=/usr/lib");
-}
-
 #define LLVM_TARGET(targetName) \
   if ((p = elf::targetName##LinkingContext::create(triple))) return p;
 
@@ -403,8 +391,9 @@ bool GnuLdDriver::parse(int argc, const char *argv[],
   for (auto libDir : parsedArgs->filtered(OPT_L))
     ctx->addSearchPath(libDir->getValue());
 
+  // Add the default search directory specific to the target.
   if (!parsedArgs->hasArg(OPT_nostdlib))
-    addPlatformSearchDirs(*ctx, triple, baseTriple);
+    ctx->addDefaultSearchDirs(baseTriple);
 
   // Handle --demangle option(For compatibility)
   if (parsedArgs->getLastArg(OPT_demangle))

lld/lib/ReaderWriter/ELF/X86/X86LinkingContext.h

@@ -36,6 +36,15 @@ public:
       return false;
     }
   }
+
+  void addDefaultSearchDirs(llvm::Triple &baseTriple) override {
+    if (_triple.getOS() == llvm::Triple::NetBSD &&
+        baseTriple.getArch() == llvm::Triple::x86_64) {
+      addSearchPath("=/usr/lib/i386");
+      return;
+    }
+    ELFLinkingContext::addDefaultSearchDirs(baseTriple);
+  }
 };
 } // end namespace elf
 } // end namespace lld