ENH: Added OUTPUT_STRIP_TRAILING_WHITESPACE and ERROR_STRIP_TRAILING_WHITESPACE options to EXECUTE_PROCESS command. These allow it to behave more like the old EXEC_PROGRAM command that it is supposed to replace.

Source/cmExecuteProcessCommand.cxx

@@ -19,7 +19,15 @@
 
 #include <cmsys/Process.h>
 
-void cmExecuteProcessCommandFixText(std::vector<char>& output);
+#include <ctype.h> /* isspace */
+
+static bool cmExecuteProcessCommandIsWhitespace(char c)
+{
+  return (isspace((int)c) || c == '\n' || c == '\r');
+}
+
+void cmExecuteProcessCommandFixText(std::vector<char>& output,
+                                    bool strip_trailing_whitespace);
 
 // cmExecuteProcessCommand
 bool cmExecuteProcessCommand
@@ -36,6 +44,8 @@ bool cmExecuteProcessCommand
   size_t command_index = 0;
   bool output_quiet = false;
   bool error_quiet = false;
+  bool output_strip_trailing_whitespace = false;
+  bool error_strip_trailing_whitespace = false;
   std::string timeout_string;
   std::string input_file;
   std::string output_file;
@@ -166,10 +176,27 @@ bool cmExecuteProcessCommand
       doing_command = false;
       error_quiet = true;
       }
+    else if(args[i] == "OUTPUT_STRIP_TRAILING_WHITESPACE")
+      {
+      doing_command = false;
+      output_strip_trailing_whitespace = true;
+      }
+    else if(args[i] == "ERROR_STRIP_TRAILING_WHITESPACE")
+      {
+      doing_command = false;
+      error_strip_trailing_whitespace = true;
+      }
     else if(doing_command)
       {
       cmds[command_index].push_back(args[i].c_str());
       }
+    else
+      {
+      cmOStringStream e;
+      e << " given unknown argument \"" << args[i] << "\".";
+      this->SetError(e.str().c_str());
+      return false;
+      }
     }
 
   if ( !this->Makefile->CanIWriteThisFile(output_file.c_str()) )
@@ -294,8 +321,10 @@ bool cmExecuteProcessCommand
   cmsysProcess_WaitForExit(cp, 0);
 
   // Fix the text in the output strings.
-  cmExecuteProcessCommandFixText(tempOutput);
-  cmExecuteProcessCommandFixText(tempError);
+  cmExecuteProcessCommandFixText(tempOutput,
+                                 output_strip_trailing_whitespace);
+  cmExecuteProcessCommandFixText(tempError,
+                                 error_strip_trailing_whitespace);
 
   // Store the output obtained.
   if(!output_variable.empty() && tempOutput.size())
@@ -344,7 +373,8 @@ bool cmExecuteProcessCommand
 }
 
 //----------------------------------------------------------------------------
-void cmExecuteProcessCommandFixText(std::vector<char>& output)
+void cmExecuteProcessCommandFixText(std::vector<char>& output,
+                                    bool strip_trailing_whitespace)
 {
   // Remove \0 characters and the \r part of \r\n pairs.
   unsigned int in_index = 0;
@@ -358,6 +388,18 @@ void cmExecuteProcessCommandFixText(std::vector<char>& output)
       output[out_index++] = c;
       }
     }
+
+  // Remove trailing whitespace if requested.
+  if(strip_trailing_whitespace)
+    {
+    while(out_index > 0 &&
+          cmExecuteProcessCommandIsWhitespace(output[out_index-1]))
+      {
+      --out_index;
+      }
+    }
+
+  // Shrink the vector to the size needed.
   output.resize(out_index);
 
   // Put a terminator on the text string.

Source/cmExecuteProcessCommand.h

@@ -78,7 +78,9 @@ public:
       "                  [OUTPUT_FILE <file>]\n"
       "                  [ERROR_FILE <file>]\n"
       "                  [OUTPUT_QUIET]\n"
-      "                  [ERROR_QUIET])\n"
+      "                  [ERROR_QUIET]\n"
+      "                  [OUTPUT_STRIP_TRAILING_WHITESPACE]\n"
+      "                  [ERROR_STRIP_TRAILING_WHITESPACE])\n"
       "Runs the given sequence of one or more commands with the standard "
       "output of each process piped to the standard input of the next.  "
       "A single standard error pipe is used for all processes.  "