Move cc build system module to separate library

1 files changed, 143 insertions, 0 deletions

diff --git a/libbuild2/cc/windows-manifest.cxx b/libbuild2/cc/windows-manifest.cxx
new file mode 100644
index 0000000..8d67f0c
--- /dev/null
+++ b/libbuild2/cc/windows-manifest.cxx
@@ -0,0 +1,143 @@
+// file      : libbuild2/cc/windows-manifest.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#include <libbuild2/scope.hxx>
+#include <libbuild2/target.hxx>
+#include <libbuild2/context.hxx>
+#include <libbuild2/variable.hxx>
+#include <libbuild2/filesystem.hxx>
+#include <libbuild2/diagnostics.hxx>
+
+#include <libbuild2/cc/link-rule.hxx>
+
+using namespace std;
+using namespace butl;
+
+namespace build2
+{
+  namespace cc
+  {
+    // Translate the compiler target CPU value to the processorArchitecture
+    // attribute value.
+    //
+    const char*
+    windows_manifest_arch (const string& tcpu)
+    {
+      const char* pa (tcpu == "i386" || tcpu == "i686"  ? "x86"   :
+                      tcpu == "x86_64"                  ? "amd64" :
+                      nullptr);
+
+      if (pa == nullptr)
+        fail << "unable to translate CPU " << tcpu << " to manifest "
+             << "processor architecture";
+
+      return pa;
+    }
+
+    // Generate a Windows manifest and if necessary create/update the manifest
+    // file corresponding to the exe{} target. Return the manifest file path
+    // and its timestamp if unchanged or timestamp_nonexistent otherwise.
+    //
+    pair<path, timestamp> link_rule::
+    windows_manifest (const file& t, bool rpath_assembly) const
+    {
+      tracer trace (x, "link_rule::windows_manifest");
+
+      const scope& rs (t.root_scope ());
+
+      const char* pa (windows_manifest_arch (cast<string> (rs[x_target_cpu])));
+
+      string m;
+
+      m += "<?xml version='1.0' encoding='UTF-8' standalone='yes'?>\n";
+      m += "<assembly xmlns='urn:schemas-microsoft-com:asm.v1'\n";
+      m += "          manifestVersion='1.0'>\n";
+
+      // Program name, version, etc.
+      //
+      string name (t.path ().leaf ().string ());
+
+      m += "  <assemblyIdentity name='"; m += name; m += "'\n";
+      m += "                    type='win32'\n";
+      m += "                    processorArchitecture='"; m += pa; m += "'\n";
+      m += "                    version='0.0.0.0'/>\n";
+
+      // Our rpath-emulating assembly.
+      //
+      if (rpath_assembly)
+      {
+        m += "  <dependency>\n";
+        m += "    <dependentAssembly>\n";
+        m += "      <assemblyIdentity name='"; m += name; m += ".dlls'\n";
+        m += "                        type='win32'\n";
+        m += "                        processorArchitecture='"; m += pa; m += "'\n";
+        m += "                        language='*'\n";
+        m += "                        version='0.0.0.0'/>\n";
+        m += "    </dependentAssembly>\n";
+        m += "  </dependency>\n";
+      }
+
+      // UAC information. Without it Windows will try to guess, which, as you
+      // can imagine, doesn't end well.
+      //
+      m += "  <trustInfo xmlns='urn:schemas-microsoft-com:asm.v3'>\n";
+      m += "    <security>\n";
+      m += "      <requestedPrivileges>\n";
+      m += "        <requestedExecutionLevel level='asInvoker' uiAccess='false'/>\n";
+      m += "      </requestedPrivileges>\n";
+      m += "    </security>\n";
+      m += "  </trustInfo>\n";
+
+      m += "</assembly>\n";
+
+      // If the manifest file exists, compare to its content. If nothing
+      // changed (common case), then we can avoid any further updates.
+      //
+      // The potentially faster alternative would be to hash it and store an
+      // entry in depdb. This, however, gets a bit complicated since we will
+      // need to avoid a race between the depdb and .manifest updates.
+      //
+      path mf (t.path () + ".manifest");
+
+      timestamp mt (mtime (mf));
+
+      if (mt != timestamp_nonexistent)
+      {
+        try
+        {
+          ifdstream is (mf);
+          if (is.read_text () == m)
+            return make_pair (move (mf), mt);
+        }
+        catch (const io_error&)
+        {
+          // Whatever the reason we failed for, let's rewrite the file.
+        }
+      }
+
+      if (verb >= 3)
+        text << "cat >" << mf;
+
+      if (!t.ctx.dry_run)
+      {
+        auto_rmfile rm (mf);
+
+        try
+        {
+          ofdstream os (mf);
+          os << m;
+          os.close ();
+          rm.cancel ();
+
+        }
+        catch (const io_error& e)
+        {
+          fail << "unable to write to " << mf << ": " << e;
+        }
+      }
+
+      return make_pair (move (mf), timestamp_nonexistent);
+    }
+  }
+}