Derive target class from target triplet for some targets

2 files changed, 28 insertions, 3 deletions

diff --git a/butl/triplet b/butl/triplet
index f61493d..44b5195 100644
--- a/butl/triplet
+++ b/butl/triplet
@@ -56,8 +56,8 @@ namespace butl
   // strategy for (presumably less common) cases were we don't split things
   // correctly.
   //
-  // Note also that the version splitting is only done for certain,
-  // commonly-used targets.
+  // Note also that the version splitting is only done for certain commonly-
+  // used targets.
   //
   // Some examples of canonicalization and splitting:
   //
@@ -75,6 +75,17 @@ namespace butl
   // x86_64-linux-gnux32              x86_64             linux-gnux32
   // x86_64-microsoft-win32-msvc14.0  x86_64  microsoft  win32-msvc     14.0
   //
+  // Similar to version splitting, for certain commonly-used targets we also
+  // derive the "target class" which can be used as a shorthand, more
+  // convenient way to identify a targets. If the target is not recognized,
+  // then the special 'other' value is used. Currently the following classes
+  // are recognized:
+  //
+  // linux     *-*-linux-*
+  // macosx    *-apple-darwin*
+  // freebsd   *-*-freebsd*
+  // windows   *-*-win32-* | *-*-mingw32
+  //
   // References:
   //
   // 1. The libtool repository contains the PLATFORM file that lists many known
@@ -88,6 +99,7 @@ namespace butl
     std::string vendor;
     std::string system;
     std::string version;
+    std::string class_;
 
     // Parse the triplet optionally returning the canonicalized string. Throw
     // std::invalid_argument if the triplet is not recognizable.
diff --git a/butl/triplet.cxx b/butl/triplet.cxx
index 8369539..39057a3 100644
--- a/butl/triplet.cxx
+++ b/butl/triplet.cxx
@@ -103,7 +103,7 @@ namespace butl
       *c += system;
     }
 
-    // Finally, extract VERSION for some recognized systems.
+    // Extract VERSION for some recognized systems.
     //
     string::size_type v (0);
     if (system.compare (0, (v = 6),  "darwin") == 0  ||
@@ -118,5 +118,18 @@ namespace butl
       version.assign (system, v, string::npos);
       system.resize (system.size () - version.size ());
     }
+
+    // Determine class for some recognized systems.
+    //
+    if (system.compare (0, 5, "linux") == 0)
+      class_ = "linux";
+    else if (vendor == "apple" && system == "darwin")
+      class_ = "macosx";
+    else if (system == "freebsd")
+      class_ = "freebsd";
+    else if (system.compare (0, 5, "win32") == 0 || system == "mingw32")
+      class_ = "windows";
+    else
+      class_ = "other";
   }
 }