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// file : libbuild2/cc/windows-manifest.cxx -*- C++ -*-
// 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 == "x86_64" ? "amd64" :
tcpu == "i386" || tcpu == "i686" ? "x86" :
tcpu == "aarch64" ? "arm64" :
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);
}
}
}
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