[ELF] Move some operations from link to setConfigs. NFC

Author: MaskRay

lld/ELF/Driver.cpp

@@ -1800,6 +1800,37 @@ static void setConfigs(opt::InputArgList &args) {
       args.hasFlag(OPT_toc_optimize, OPT_no_toc_optimize, m == EM_PPC64);
   config->pcRelOptimize =
       args.hasFlag(OPT_pcrel_optimize, OPT_no_pcrel_optimize, m == EM_PPC64);
+
+  if (!args.hasArg(OPT_hash_style)) {
+    if (config->emachine == EM_MIPS)
+      config->sysvHash = true;
+    else
+      config->sysvHash = config->gnuHash = true;
+  }
+
+  // Set default entry point and output file if not specified by command line or
+  // linker scripts.
+  config->warnMissingEntry =
+      (!config->entry.empty() || (!config->shared && !config->relocatable));
+  if (config->entry.empty() && !config->relocatable)
+    config->entry = config->emachine == EM_MIPS ? "__start" : "_start";
+  if (config->outputFile.empty())
+    config->outputFile = "a.out";
+
+  // Fail early if the output file or map file is not writable. If a user has a
+  // long link, e.g. due to a large LTO link, they do not wish to run it and
+  // find that it failed because there was a mistake in their command-line.
+  {
+    llvm::TimeTraceScope timeScope("Create output files");
+    if (auto e = tryCreateFile(config->outputFile))
+      error("cannot open output file " + config->outputFile + ": " +
+            e.message());
+    if (auto e = tryCreateFile(config->mapFile))
+      error("cannot open map file " + config->mapFile + ": " + e.message());
+    if (auto e = tryCreateFile(config->whyExtract))
+      error("cannot open --why-extract= file " + config->whyExtract + ": " +
+            e.message());
+  }
 }
 
 static bool isFormatBinary(StringRef s) {
@@ -2682,43 +2713,6 @@ static void postParseObjectFile(ELFFileBase *file) {
 // all linker scripts have already been parsed.
 void LinkerDriver::link(opt::InputArgList &args) {
   llvm::TimeTraceScope timeScope("Link", StringRef("LinkerDriver::Link"));
-  // If a --hash-style option was not given, set to a default value,
-  // which varies depending on the target.
-  if (!args.hasArg(OPT_hash_style)) {
-    if (config->emachine == EM_MIPS)
-      config->sysvHash = true;
-    else
-      config->sysvHash = config->gnuHash = true;
-  }
-
-  // Default output filename is "a.out" by the Unix tradition.
-  if (config->outputFile.empty())
-    config->outputFile = "a.out";
-
-  // Fail early if the output file or map file is not writable. If a user has a
-  // long link, e.g. due to a large LTO link, they do not wish to run it and
-  // find that it failed because there was a mistake in their command-line.
-  {
-    llvm::TimeTraceScope timeScope("Create output files");
-    if (auto e = tryCreateFile(config->outputFile))
-      error("cannot open output file " + config->outputFile + ": " +
-            e.message());
-    if (auto e = tryCreateFile(config->mapFile))
-      error("cannot open map file " + config->mapFile + ": " + e.message());
-    if (auto e = tryCreateFile(config->whyExtract))
-      error("cannot open --why-extract= file " + config->whyExtract + ": " +
-            e.message());
-  }
-  if (errorCount())
-    return;
-
-  // Use default entry point name if no name was given via the command
-  // line nor linker scripts. For some reason, MIPS entry point name is
-  // different from others.
-  config->warnMissingEntry =
-      (!config->entry.empty() || (!config->shared && !config->relocatable));
-  if (config->entry.empty() && !config->relocatable)
-    config->entry = (config->emachine == EM_MIPS) ? "__start" : "_start";
 
   // Handle --trace-symbol.
   for (auto *arg : args.filtered(OPT_trace_symbol))