From a4796d5b851dac4a546f89c282f65e320076eb10 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Sat, 27 Aug 2016 09:53:30 +0200
Subject: Clean up library export, make c and cxx modules project root only

So now c and cxx modules can only be loaded in project root scope (normally
root.build). Also, the c.std and cxx.std must now be set *before* loading the
module to take effect. This means we won't be able to handle old buildfiles
anymore but old versions of build2 should be able to handle new *.std
placement.
---
 build2/cc/gcc.cxx | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 build2/cc/gcc.cxx

(limited to 'build2/cc/gcc.cxx')

diff --git a/build2/cc/gcc.cxx b/build2/cc/gcc.cxx
new file mode 100644
index 0000000..a6c7448
--- /dev/null
+++ b/build2/cc/gcc.cxx
@@ -0,0 +1,128 @@
+// file      : build2/cc/gcc.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2016 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <build2/scope>
+#include <build2/target>
+#include <build2/context>
+#include <build2/variable>
+#include <build2/filesystem>
+#include <build2/diagnostics>
+
+#include <build2/bin/target>
+
+#include <build2/cc/types>
+
+#include <build2/cc/module>
+
+using namespace std;
+using namespace butl;
+
+namespace build2
+{
+  namespace cc
+  {
+    using namespace bin;
+
+    // Extract system library search paths from GCC (gcc/g++) or compatible
+    // (Clang, Intel) using the -print-search-dirs option.
+    //
+    dir_paths config_module::
+    gcc_library_search_paths (process_path& xc, scope& rs) const
+    {
+      dir_paths r;
+
+      cstrings args;
+      string std; // Storage.
+
+      args.push_back (xc.recall_string ());
+      append_options (args, rs, c_coptions);
+      append_options (args, rs, x_coptions);
+      if (!tstd.empty ()) args.push_back (tstd.c_str ());
+      append_options (args, rs, c_loptions);
+      append_options (args, rs, x_loptions);
+      args.push_back ("-print-search-dirs");
+      args.push_back (nullptr);
+
+      if (verb >= 3)
+        print_process (args);
+
+      string l;
+      try
+      {
+        process pr (xc, args.data (), 0, -1); // Open pipe to stdout.
+
+        try
+        {
+          ifdstream is (pr.in_ofd, fdstream_mode::skip, ifdstream::badbit);
+
+          string s;
+          while (getline (is, s))
+          {
+            if (s.compare (0, 12, "libraries: =") == 0)
+            {
+              l.assign (s, 12, string::npos);
+              break;
+            }
+          }
+
+          is.close (); // Don't block.
+
+          if (!pr.wait ())
+            throw failed ();
+        }
+        catch (const ifdstream::failure&)
+        {
+          pr.wait ();
+          fail << "error reading " << x_lang << " compiler -print-search-dirs "
+               << "output";
+        }
+      }
+      catch (const process_error& e)
+      {
+        error << "unable to execute " << args[0] << ": " << e.what ();
+
+        if (e.child ())
+          exit (1);
+
+        throw failed ();
+      }
+
+      if (l.empty ())
+        fail << "unable to extract " << x_lang << " compiler system library "
+             << "search paths";
+
+      // Now the fun part: figuring out which delimiter is used. Normally it
+      // is ':' but on Windows it is ';' (or can be; who knows for sure). Also
+      // note that these paths are absolute (or should be). So here is what we
+      // are going to do: first look for ';'. If found, then that's the
+      // delimiter. If not found, then there are two cases: it is either a
+      // single Windows path or the delimiter is ':'. To distinguish these two
+      // cases we check if the path starts with a Windows drive.
+      //
+      char d (';');
+      string::size_type e (l.find (d));
+
+      if (e == string::npos &&
+          (l.size () < 2 || l[0] == '/' || l[1] != ':'))
+      {
+        d = ':';
+        e = l.find (d);
+      }
+
+      // Now chop it up. We already have the position of the first delimiter
+      // (if any).
+      //
+      for (string::size_type b (0);; e = l.find (d, (b = e + 1)))
+      {
+        r.emplace_back (l, b, (e != string::npos ? e - b : e));
+        r.back ().normalize ();
+
+        if (e == string::npos)
+          break;
+      }
+
+      return r;
+    }
+  }
+}
-- 
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