Add Lua-style long brackets and long comments to CMake language

Teach the CMake language parser to recognize Lua-style "long bracket"
arguments.  These start with two '[' separated by zero or more '='
characters e.g. "[[" or "[=[" or "[==[".  They end with two ']'
separated by the same number of '=' as the opening bracket.  There is no
nesting of brackets of the same level (number of '=').  No escapes,
variable expansion, or other processing is performed on the content
between such brackets so they always represent exactly one argument.

Also teach CMake to parse and ignore "long comment" syntax.  A long
comment starts with "#" immediately followed by an opening long bracket.
It ends at the matching close long bracket.

Teach the RunCMake.Syntax test to cover long bracket and long comment
cases.

1 files changed, 6 insertions, 0 deletions

diff --git a/Source/cmMakefile.cxx b/Source/cmMakefile.cxx
index a390e06..13c43fa 100644
--- a/Source/cmMakefile.cxx
+++ b/Source/cmMakefile.cxx
@@ -2867,6 +2867,12 @@ bool cmMakefile::ExpandArguments(
   outArgs.reserve(inArgs.size());
   for(i = inArgs.begin(); i != inArgs.end(); ++i)
     {
+    // No expansion in a bracket argument.
+    if(i->Delim == cmListFileArgument::Bracket)
+      {
+      outArgs.push_back(i->Value);
+      continue;
+      }
     // Expand the variables in the argument.
     value = i->Value;
     this->ExpandVariablesInString(value, false, false, false,