Configuration framework and boost.math long long configuration.

[SVN r59867]

build/Jamfile.v2

@@ -63,11 +63,54 @@ sph_legendre
 sph_neumann
 ;
 
-if --disable-long-double in [ modules.peek : ARGV ] 
-{ 
-   long-double-opts = <build>no ; 
-} 
+# Configure checks.
+
+import project ;
+import configure ;
+import property ;
+import property-set ;
+
+exe long_double_check : ../src/long_double_check.cpp ;
+explicit long_double_check ;
+
+local .long-double-reported ;
+project = [ project.current ] ;
+
+rule long-double-configure ( properties * )
+{
+    local disabled ;
+    if [ option.get disable-long-double : : yes ]
+    {
+        disabled = true ;
+    }
+    else
+    {                
+        # The presence of long double depends only on toolset. 
+        local toolset = [ property.select <toolset> : $(properties) ] ;
+        local ps = [ property-set.create $(toolset) ] ;
+        local ap = [ $(ps).as-path ] ;
+    
+        if ! [ configure.builds long_double_check : $(project) : $(ps) 
+          : "long double support" ]
+         {       
+              if ! $(.long-double-reported)
+              {
+                  configure.log-component-configuration math :
+                    "long long not available, skipping boost_math_tr1l/boost_math_c99l" ;
+                  .long-double-reported = true ;
+              }        
+              disabled = true ;
+         }
+    }
+    if $(disabled)
+    {        
+        return <build>no ;
+    }    
+}
+
+long-double-opts = <conditional>@long-double-configure ;
  	
+# Library targets
 lib boost_math_tr1 : ../src/tr1/$(TR1_SOURCES).cpp pch
     :         
  	     <link>shared:<define>BOOST_MATH_TR1_DYN_LINK=1

src/long_double_check.cpp

@@ -0,0 +1,6 @@
+
+int main()
+{
+    long double x;
+    return 0;
+}