driver: Add a `--rsp-quoting` flag to pick response file quoting.

Currently, clang-cl always uses Windows style for unquoting, and clang always
uses POSIX style for unquoting.

With this flag, it's possible to change these defaults.

In general, response file quoting should match the shell the response file is
used in.  On Windows, it's possible to run clang-cl in a bash shell, or clang in
cmd.exe, so a flag for overriding the default behavior is natural there.

On non-Windows, Windows quoting probably never makes sense (except maybe in
Wine), but having clang-cl behave differently based on the host OS seems
strange too.  So require that people who want to use posix-style response
files with clang-cl on non-Windows pass --rsp-quoting=posix.

http://reviews.llvm.org/D19425

llvm-svn: 267474

clang/include/clang/Driver/Options.td

@@ -152,6 +152,9 @@ class InternalDriverOpt : Group<internal_driver_Group>,
 def driver_mode : Joined<["--"], "driver-mode=">, Group<internal_driver_Group>,
   Flags<[CoreOption, DriverOption, HelpHidden]>,
   HelpText<"Set the driver mode to either 'gcc', 'g++', 'cpp', or 'cl'">;
+def rsp_quoting : Joined<["--"], "rsp-quoting=">, Group<internal_driver_Group>,
+  Flags<[CoreOption, DriverOption, HelpHidden]>,
+  HelpText<"Set the rsp quoting to either 'posix', or 'windows'">;
 def ccc_gcc_name : Separate<["-"], "ccc-gcc-name">, InternalDriverOpt,
   HelpText<"Name for native GCC compiler">,
   MetaVarName<"<gcc-path>">;

clang/lib/Driver/Driver.cpp

@@ -1813,8 +1813,9 @@ void Driver::BuildJobs(Compilation &C) const {
   // Claim -### here.
   (void)C.getArgs().hasArg(options::OPT__HASH_HASH_HASH);
 
-  // Claim --driver-mode, it was handled earlier.
+  // Claim --driver-mode, --rsp-quoting, it was handled earlier.
   (void)C.getArgs().hasArg(options::OPT_driver_mode);
+  (void)C.getArgs().hasArg(options::OPT_rsp_quoting);
 
   for (Arg *A : C.getArgs()) {
     // FIXME: It would be nice to be able to send the argument to the

clang/test/Driver/at_file_win.c

@@ -0,0 +1,34 @@
+// RUN: %clang --rsp-quoting=windows -E %s @%s.args -o %t.log
+// RUN: FileCheck --input-file=%t.log %s
+
+// CHECK: bar1
+// CHECK-NEXT: bar2 zed2
+// CHECK-NEXT: bar3 zed3
+// CHECK-NEXT: bar4 zed4
+// CHECK-NEXT: bar5 zed5
+// CHECK-NEXT: 'bar6 zed6'
+// CHECK-NEXT: 'bar7 zed7'
+// CHECK-NEXT: foo8bar8zed8
+// CHECK-NEXT: foo9\'bar9\'zed9
+// CHECK-NEXT: foo10"bar10"zed10
+// CHECK: bar
+// CHECK: zed12
+// CHECK: one\two
+// CHECK: c:\foo\bar.c
+
+foo1
+foo2
+foo3
+foo4
+foo5
+foo6
+foo7
+foo8
+foo9
+foo10
+#ifdef foo11
+bar
+#endif
+foo12
+foo13
+foo14

clang/test/Driver/at_file_win.c.args

@@ -0,0 +1,13 @@
+-Dfoo1=bar1 -Dfoo2="bar2 zed2"
+-Dfoo3="bar3 zed3"
+"-Dfoo4=bar4 zed4"
+"-Dfoo5=bar5 zed5"
+-Dfoo6="'bar6 zed6'"
+-Dfoo7='"bar7 zed7"'
+-Dfoo8=foo8"bar8"zed8
+-Dfoo9=foo9\'bar9\'zed9
+-Dfoo10=foo10\"bar10\"zed10
+-D foo11
+-Dfoo12=zed12
+-Dfoo13=one\two
+-Dfoo14=c:\foo\bar.c

clang/tools/driver/driver.cpp

@@ -345,17 +345,24 @@ int main(int argc_, const char **argv_) {
       }) != argv.end()) {
     ClangCLMode = true;
   }
+  enum { Default, POSIX, Windows } RSPQuoting = Default;
+  for (const char *F : argv) {
+    if (strcmp(F, "--rsp-quoting=posix") == 0)
+      RSPQuoting = POSIX;
+    else if (strcmp(F, "--rsp-quoting=windows") == 0)
+      RSPQuoting = Windows;
+  }
 
   // Determines whether we want nullptr markers in argv to indicate response
   // files end-of-lines. We only use this for the /LINK driver argument with
   // clang-cl.exe on Windows.
-  bool MarkEOLs = false;
+  bool MarkEOLs = ClangCLMode;
 
-  llvm::cl::TokenizerCallback Tokenizer = &llvm::cl::TokenizeGNUCommandLine;
-  if (ClangCLMode) {
+  llvm::cl::TokenizerCallback Tokenizer;
+  if (RSPQuoting == Windows || (RSPQuoting == Default && ClangCLMode))
     Tokenizer = &llvm::cl::TokenizeWindowsCommandLine;
-    MarkEOLs = true;
-  }
+  else
+    Tokenizer = &llvm::cl::TokenizeGNUCommandLine;
 
   if (MarkEOLs && argv.size() > 1 && StringRef(argv[1]).startswith("-cc1"))
     MarkEOLs = false;