Merge pull request #25 from simonmar/embedded_double_conversion

Optionally use an external double-conversion library

Author: Haskell-mouse

cbits/hs-double-conversion.cc

@@ -1,4 +1,8 @@
+#ifdef EMBEDDED_DOUBLE_CONVERSION
 #include "double-conversion.h"
+#else
+#include "double-conversion/double-conversion.h"
+#endif
 #include "hs-double-conversion.h"
 #include <stdio.h>
 

double-conversion.cabal

@@ -65,17 +65,13 @@ flag developer
   default: False
   manual: True
 
+flag embedded_double_conversion
+  description: embed the C++ double_conversion library
+  default: True
+
 library
   c-sources:
     cbits/hs-double-conversion.cc
-    double-conversion/src/bignum.cc
-    double-conversion/src/bignum-dtoa.cc
-    double-conversion/src/cached-powers.cc
-    double-conversion/src/diy-fp.cc
-    double-conversion/src/double-conversion.cc
-    double-conversion/src/fast-dtoa.cc
-    double-conversion/src/fixed-dtoa.cc
-    double-conversion/src/strtod.cc
 
   if os(windows)
     if arch(x86_64)
@@ -88,8 +84,22 @@ library
     else
       extra-libraries: stdc++
 
+  if flag(embedded_double_conversion)
+    c-sources:
+      double-conversion/src/bignum.cc
+      double-conversion/src/bignum-dtoa.cc
+      double-conversion/src/cached-powers.cc
+      double-conversion/src/diy-fp.cc
+      double-conversion/src/double-conversion.cc
+      double-conversion/src/fast-dtoa.cc
+      double-conversion/src/fixed-dtoa.cc
+      double-conversion/src/strtod.cc
+    cc-options: -DEMBEDDED_DOUBLE_CONVERSION
+    include-dirs: double-conversion/src
+  else
+    extra-libraries: double-conversion
+
   include-dirs:
-    double-conversion/src
     include
 
   exposed-modules: