[libclang][reproducers] Escape command-line arguments in a generated script. (#11498)

Author: vsapsai

clang/test/Modules/reproducer-with-module-dependencies.c

@@ -16,7 +16,8 @@
 // Test the content of a reproducer script.
 // RUN: c-index-test core -gen-deps-reproducer -working-dir %t -o %t/repro-content \
 // RUN:   -- clang-executable -c %t/reproducer.c -o %t/reproducer.o \
-// RUN:      -fmodules -fmodules-cache-path=%t
+// RUN:      -fmodules -fmodules-cache-path=%t \
+// RUN:      -DMACRO="\$foo"
 // RUN: FileCheck %t/script-expectations.txt --input-file %t/repro-content/reproducer.sh
 
 //--- modular-header.h
@@ -40,3 +41,4 @@ void test(void) {
 //--- script-expectations.txt
 CHECK: CLANG:-clang-executable
 CHECK: -fmodule-file=Test=reproducer.cache/explicitly-built-modules/Test-{{.*}}.pcm
+CHECK: MACRO=\$foo

clang/tools/libclang/CDependencies.cpp

@@ -845,8 +845,10 @@ enum CXErrorCode clang_experimental_DependencyScanner_generateReproducer(
                          &FileCacheName](llvm::raw_fd_ostream &OS,
                                          ArrayRef<std::string> Arguments) {
     OS << ReproExecutable;
-    for (int I = 0, E = Arguments.size(); I < E; ++I)
-      OS << ' ' << Arguments[I];
+    for (int I = 0, E = Arguments.size(); I < E; ++I) {
+      OS << ' ';
+      llvm::sys::printArg(OS, Arguments[I], /*Quote=*/true);
+    }
     OS << " -ivfsoverlay \"" << FileCacheName << "/vfs/vfs.yaml\"";
     OS << '\n';
   };