BUG: Do not escape shell operators when generating command lines.

- See bug#6868.
  - Update CustomCommand test to check.

Source/cmLocalGenerator.cxx

@@ -2544,10 +2544,33 @@ std::string cmLocalGenerator::EscapeForShellOldStyle(const char* str)
   return result;
 }
 
+//----------------------------------------------------------------------------
+static bool cmLocalGeneratorIsShellOperator(const char* str)
+{
+  if(strcmp(str, "<") == 0 ||
+     strcmp(str, ">") == 0 ||
+     strcmp(str, "<<") == 0 ||
+     strcmp(str, ">>") == 0 ||
+     strcmp(str, "|") == 0 ||
+     strcmp(str, "&>") == 0 ||
+     strcmp(str, "2>&1") == 0 ||
+     strcmp(str, "1>&2") == 0)
+    {
+    return true;
+    }
+  return false;
+}
+
 //----------------------------------------------------------------------------
 std::string cmLocalGenerator::EscapeForShell(const char* str, bool makeVars,
                                              bool forEcho)
 {
+  // Do not escape shell operators.
+  if(cmLocalGeneratorIsShellOperator(str))
+    {
+    return str;
+    }
+
   // Compute the flags for the target shell environment.
   int flags = 0;
   if(this->WindowsVSIDE)

Tests/CustomCommand/CMakeLists.txt

@@ -150,6 +150,7 @@ ADD_EXECUTABLE(CustomCommand
   ${PROJECT_BINARY_DIR}/wrapped_help.c
   ${PROJECT_BINARY_DIR}/generated.c
   ${PROJECT_BINARY_DIR}/not_included.h
+  gen_redirect.c # default location for custom commands is in build tree
   )
 
 # Add the rule to create generated.c at build time.  This is placed
@@ -191,6 +192,17 @@ ADD_CUSTOM_COMMAND(TARGET CustomCommandUsingTargetTest POST_BUILD
 
 ADD_SUBDIRECTORY(GeneratorInExtraDir)
 
+##############################################################################
+# Test shell operators in custom commands.
+
+ADD_EXECUTABLE(tcat tcat.cxx)
+
+ADD_CUSTOM_COMMAND(OUTPUT gen_redirect.c
+  DEPENDS tcat gen_redirect_in.c
+  COMMAND tcat < ${CMAKE_CURRENT_SOURCE_DIR}/gen_redirect_in.c > gen_redirect.c
+  COMMAND ${CMAKE_COMMAND} -E echo "#endif" >> gen_redirect.c
+  VERBATIM
+  )
 
 ##############################################################################
 # Test non-trivial command line arguments in custom commands.
@@ -303,8 +315,8 @@ SET(CHECK_ARGS
   "one|pipe w s"
   "#two-pounds# w s"
   "one#pound w s"
-  ~ ` ! @ \# $ % ^ & _ - + = | : "\;" \" ' , . ? "(" ")" { } []
-#  < > << >> &> 2>&1 1>&2
+  ~ ` ! @ \# $ % ^ & _ - + = : "\;" \" ' , . ? "(" ")" { } []
+# | < > << >> &> 2>&1 1>&2
 # \\ # Need to test last to avoid ; escape in list.
 #    # Make tools need help when this is the last argument.
   )

Tests/CustomCommand/GeneratorInExtraDir/CMakeLists.txt

@@ -1,3 +1,5 @@
+ADD_DEFINITIONS(-DGENERATOR_EXTERN)
+
 # add the executable which will be used for generating files
 ADD_EXECUTABLE(generator_extern ../generator.cxx)
 SET_TARGET_PROPERTIES(generator_extern PROPERTIES OUTPUT_NAME the_external_generator)

Tests/CustomCommand/gen_redirect_in.c

@@ -0,0 +1,5 @@
+#if 1
+
+int gen_redirect() { return 3; }
+
+/* endif should be concatenated to generated file */

Tests/CustomCommand/generator.cxx

@@ -8,8 +8,12 @@ int main(int argc, char *argv[])
     return 1;
     }
   FILE *fp = fopen(argv[1],"w");
-  
+#ifdef GENERATOR_EXTERN
   fprintf(fp,"int generated() { return 3; }\n");
+#else
+  fprintf(fp,"extern int gen_redirect(void);\n");
+  fprintf(fp,"int generated() { return gen_redirect(); }\n");
+#endif
   fclose(fp);
   return 0;
 }

Tests/CustomCommand/tcat.cxx

@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main()
+{
+  int c;
+  while((c = getc(stdin), c != EOF))
+    {
+    putc(c, stdout);
+    }
+  return 0;
+}