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// file : build/cxx/module.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <build/cxx/module>
#include <butl/process>
#include <butl/fdstream>
#include <build/scope>
#include <build/diagnostics>
#include <build/config/utility>
#include <build/bin/target>
#include <build/cxx/rule>
#include <build/cxx/target>
using namespace std;
using namespace butl;
namespace build
{
namespace cxx
{
compile compile_;
link link_;
extern "C" void
cxx_init (scope& root,
scope& base,
const location& l,
std::unique_ptr<module>&,
bool first)
{
tracer trace ("cxx::init");
level4 ([&]{trace << "for " << base.path ();});
// Initialize the bin module. Only do this if it hasn't already
// been loaded so that we don't overwrite user's bin.* settings.
//
if (base.find_target_type ("obj") == nullptr)
load_module ("bin", root, base, l);
// Register target types.
//
{
auto& tts (base.target_types);
tts.insert<h> ();
tts.insert<c> ();
tts.insert<cxx> ();
tts.insert<hxx> ();
tts.insert<ixx> ();
tts.insert<txx> ();
}
// Register rules.
//
{
using namespace bin;
auto& rs (base.rules);
rs.insert<obja> (default_id, "cxx.compile", compile_);
rs.insert<obja> (update_id, "cxx.compile", compile_);
rs.insert<obja> (clean_id, "cxx.compile", compile_);
rs.insert<objso> (default_id, "cxx.compile", compile_);
rs.insert<objso> (update_id, "cxx.compile", compile_);
rs.insert<objso> (clean_id, "cxx.compile", compile_);
rs.insert<exe> (default_id, "cxx.link", link_);
rs.insert<exe> (update_id, "cxx.link", link_);
rs.insert<exe> (clean_id, "cxx.link", link_);
rs.insert<liba> (default_id, "cxx.link", link_);
rs.insert<liba> (update_id, "cxx.link", link_);
rs.insert<liba> (clean_id, "cxx.link", link_);
rs.insert<libso> (default_id, "cxx.link", link_);
rs.insert<libso> (update_id, "cxx.link", link_);
rs.insert<libso> (clean_id, "cxx.link", link_);
}
// Configure.
//
// config.cxx
//
if (first)
{
auto r (config::required (root, "config.cxx", "g++"));
// If we actually set a new value, test it by trying to execute.
//
if (r.second)
{
const string& cxx (r.first);
const char* args[] = {cxx.c_str (), "-dumpversion", nullptr};
if (verb)
print_process (args);
else
text << "test " << cxx;
string ver;
try
{
process pr (args, false, false, true);
ifdstream is (pr.in_ofd);
bool r (getline (is, ver));
if (!r)
fail << "unexpected output from " << cxx;
if (!pr.wait ())
throw failed ();
}
catch (const process_error& e)
{
error << "unable to execute " << cxx << ": " << e.what ();
if (e.child ())
exit (1);
throw failed ();
}
if (verb)
text << cxx << " " << ver;
}
}
// config.cxx.{p,c,l}options
// config.cxx.libs
//
// These are optional. We also merge them into the corresponding
// cxx.* variables.
//
// The merging part gets a bit tricky if this module has already
// been loaded in one of the outer scopes. By doing the straight
// append we would just be repeating the same options over and
// over. So what we are going to do is only append to a value if
// it came from this scope. Then the usage for merging becomes:
//
// cxx.coptions = <overridable options> # Note: '='.
// using cxx
// cxx.coptions += <overriding options> # Note: '+='.
//
if (auto* v = config::optional<list_value> (root, "config.cxx.poptions"))
base.assign ("cxx.poptions") += *v;
if (auto* v = config::optional<list_value> (root, "config.cxx.coptions"))
base.assign ("cxx.coptions") += *v;
if (auto* v = config::optional<list_value> (root, "config.cxx.loptions"))
base.assign ("cxx.loptions") += *v;
if (auto* v = config::optional<list_value> (root, "config.cxx.libs"))
base.assign ("cxx.libs") += *v;
}
}
}
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