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-rw-r--r--build/cxx/rule.cxx1300
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diff --git a/build/cxx/rule.cxx b/build/cxx/rule.cxx
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--- a/build/cxx/rule.cxx
+++ /dev/null
@@ -1,1300 +0,0 @@
-// file : build/cxx/rule.cxx -*- C++ -*-
-// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
-// license : MIT; see accompanying LICENSE file
-
-#include <build/cxx/rule>
-
-#include <map>
-#include <string>
-#include <cstddef> // size_t
-#include <cstdlib> // exit
-#include <utility> // move()
-
-#include <butl/process>
-#include <butl/utility> // reverse_iterate
-#include <butl/fdstream>
-#include <butl/optional>
-#include <butl/path-map>
-
-#include <build/types>
-#include <build/scope>
-#include <build/variable>
-#include <build/algorithm>
-#include <build/diagnostics>
-#include <build/context>
-
-#include <build/bin/target>
-#include <build/cxx/target>
-
-#include <build/config/utility>
-
-using namespace std;
-using namespace butl;
-
-namespace build
-{
- namespace cxx
- {
- using namespace bin;
-
- using config::append_options;
-
- static void
- append_std (cstrings& args, target& t, string& opt)
- {
- if (auto val = t["cxx.std"])
- {
- const string& v (val.as<const string&> ());
-
- // Translate 11 to 0x and 14 to 1y for compatibility with
- // older versions of the compiler.
- //
- opt = "-std=c++";
-
- if (v == "11")
- opt += "0x";
- else if (v == "14")
- opt += "1y";
- else
- opt += v;
-
- args.push_back (opt.c_str ());
- }
- }
-
- // Append library options from one of the cxx.export.* variables
- // recursively, prerequisite libraries first.
- //
- static void
- append_lib_options (cstrings& args, target& l, const char* var)
- {
- for (target* t: l.prerequisite_targets)
- {
- if (t->is_a<lib> () || t->is_a<liba> () || t->is_a<libso> ())
- append_lib_options (args, *t, var);
- }
-
- append_options (args, l, var);
- }
-
- // compile
- //
- match_result compile::
- match (action a, target& t, const string&) const
- {
- tracer trace ("cxx::compile::match");
-
- // @@ TODO:
- //
- // - check prerequisites: single source file
- // - check prerequisites: the rest are headers (other ignorable?)
- // - if path already assigned, verify extension?
- //
-
- // See if we have a C++ source file. Iterate in reverse so that
- // a source file specified for an obj*{} member overrides the one
- // specified for the group. Also "see through" groups.
- //
- for (prerequisite_member p: reverse_group_prerequisite_members (a, t))
- {
- if (p.is_a<cxx> ())
- return p;
- }
-
- level3 ([&]{trace << "no c++ source file for target " << t;});
- return nullptr;
- }
-
- static void
- inject_prerequisites (action, target&, cxx&, scope&);
-
- recipe compile::
- apply (action a, target& xt, const match_result& mr) const
- {
- path_target& t (static_cast<path_target&> (xt));
-
- // Derive file name from target name.
- //
- if (t.path ().empty ())
- t.derive_path ("o", nullptr, (t.is_a<objso> () ? "-so" : nullptr));
-
- // Inject dependency on the output directory.
- //
- inject_parent_fsdir (a, t);
-
- // Search and match all the existing prerequisites. The injection
- // code (below) takes care of the ones it is adding.
- //
- // When cleaning, ignore prerequisites that are not in the same
- // or a subdirectory of our strong amalgamation.
- //
- const dir_path* amlg (
- a.operation () != clean_id
- ? nullptr
- : &t.strong_scope ().path ());
-
- for (prerequisite_member p: group_prerequisite_members (a, t))
- {
- target& pt (p.search ());
-
- if (a.operation () == clean_id && !pt.dir.sub (*amlg))
- continue;
-
- // A dependency on a library is there so that we can get its
- // cxx.export.poptions. In particular, making sure it is
- // executed before us will only restrict parallelism. But we
- // do need to match it in order to get its prerequisite_targets
- // populated; see append_lib_options() above.
- //
- if (pt.is_a<lib> () || pt.is_a<liba> () || pt.is_a<libso> ())
- {
- // @@ The fact that we match but never execute messes up
- // the dependents count. This is a workaround, not a
- // solution.
- //
- if (a.operation () == update_id)
- build::match (a, pt);
-
- continue;
- }
-
- build::match (a, pt);
- t.prerequisite_targets.push_back (&pt);
- }
-
- // Inject additional prerequisites. We only do it for update
- // since chances are we will have to update some of our
- // prerequisites in the process (auto-generated source code).
- //
- if (a.operation () == update_id)
- {
- // The cached prerequisite target should be the same as what
- // is in t.prerequisite_targets since we used standard
- // search() and match() above.
- //
- // @@ Ugly.
- //
- cxx& st (
- dynamic_cast<cxx&> (
- mr.target != nullptr ? *mr.target : *mr.prerequisite->target));
- inject_prerequisites (a, t, st, mr.prerequisite->scope);
- }
-
- switch (a)
- {
- case perform_update_id: return &perform_update;
- case perform_clean_id: return &perform_clean;
- default: return default_recipe; // Forward to prerequisites.
- }
- }
-
- // The strings used as the map key should be from the extension_pool.
- // This way we can just compare pointers.
- //
- using ext_map = map<const string*, const target_type*>;
-
- static ext_map
- build_ext_map (scope& r)
- {
- ext_map m;
-
- if (auto val = r["h.ext"])
- m[&extension_pool.find (val.as<const string&> ())] = &h::static_type;
-
- if (auto val = r["c.ext"])
- m[&extension_pool.find (val.as<const string&> ())] = &c::static_type;
-
- if (auto val = r["hxx.ext"])
- m[&extension_pool.find (val.as<const string&> ())] = &hxx::static_type;
-
- if (auto val = r["ixx.ext"])
- m[&extension_pool.find (val.as<const string&> ())] = &ixx::static_type;
-
- if (auto val = r["txx.ext"])
- m[&extension_pool.find (val.as<const string&> ())] = &txx::static_type;
-
- if (auto val = r["cxx.ext"])
- m[&extension_pool.find (val.as<const string&> ())] = &cxx::static_type;
-
- return m;
- }
-
- // Mapping of include prefixes (e.g., foo in <foo/bar>) for auto-
- // generated headers to directories where they will be generated.
- //
- // We are using a prefix map of directories (dir_path_map) instead
- // of just a map in order also cover sub-paths (e.g., <foo/more/bar>
- // if we continue with the example). Specifically, we need to make
- // sure we don't treat foobar as a sub-directory of foo.
- //
- // @@ The keys should be canonicalized.
- //
- using prefix_map = dir_path_map<dir_path>;
-
- static void
- append_prefixes (prefix_map& m, target& t, const char* var)
- {
- tracer trace ("cxx::append_prefixes");
-
- const dir_path& out_base (t.dir);
- const dir_path& out_root (t.root_scope ().path ());
-
- if (auto val = t[var])
- {
- const list_value& l (val.template as<const list_value&> ());
-
- // Assume the names have already been vetted by append_options().
- //
- for (auto i (l.begin ()), e (l.end ()); i != e; ++i)
- {
- // -I can either be in the -Ifoo or -I foo form.
- //
- dir_path d;
- if (i->value == "-I")
- {
- if (++i == e)
- break; // Let the compiler complain.
-
- d = i->simple () ? dir_path (i->value) : i->dir;
- }
- else if (i->value.compare (0, 2, "-I") == 0)
- d = dir_path (i->value, 2, string::npos);
- else
- continue;
-
- level5 ([&]{trace << "-I '" << d << "'";});
-
- // If we are relative or not inside our project root, then
- // ignore.
- //
- if (d.relative () || !d.sub (out_root))
- continue;
-
- // If the target directory is a sub-directory of the include
- // directory, then the prefix is the difference between the
- // two. Otherwise, leave it empty.
- //
- // The idea here is to make this "canonical" setup work auto-
- // magically:
- //
- // 1. We include all files with a prefix, e.g., <foo/bar>.
- // 2. The library target is in the foo/ sub-directory, e.g.,
- // /tmp/foo/.
- // 3. The poptions variable contains -I/tmp.
- //
- dir_path p (out_base.sub (d) ? out_base.leaf (d) : dir_path ());
-
- auto j (m.find (p));
-
- if (j != m.end ())
- {
- if (j->second != d)
- fail << "duplicate generated dependency prefix '" << p << "'" <<
- info << "old mapping to " << j->second <<
- info << "new mapping to " << d;
- }
- else
- {
- level5 ([&]{trace << "'" << p << "' = '" << d << "'";});
- m.emplace (move (p), move (d));
- }
- }
- }
- }
-
- // Append library prefixes based on the cxx.export.poptions variables
- // recursively, prerequisite libraries first.
- //
- static void
- append_lib_prefixes (prefix_map& m, target& l)
- {
- for (target* t: l.prerequisite_targets)
- {
- if (t == nullptr)
- continue;
-
- if (t->is_a<lib> () || t->is_a<liba> () || t->is_a<libso> ())
- append_lib_prefixes (m, *t);
- }
-
- append_prefixes (m, l, "cxx.export.poptions");
- }
-
- static prefix_map
- build_prefix_map (target& t)
- {
- prefix_map m;
-
- // First process the include directories from prerequisite
- // libraries. Note that here we don't need to see group
- // members (see apply()).
- //
- for (prerequisite& p: group_prerequisites (t))
- {
- target& pt (*p.target); // Already searched and matched.
-
- if (pt.is_a<lib> () || pt.is_a<liba> () || pt.is_a<libso> ())
- append_lib_prefixes (m, pt);
- }
-
- // Then process our own.
- //
- append_prefixes (m, t, "cxx.poptions");
-
- return m;
- }
-
- // Return the next make prerequisite starting from the specified
- // position and update position to point to the start of the
- // following prerequisite or l.size() if there are none left.
- //
- static string
- next (const string& l, size_t& p)
- {
- size_t n (l.size ());
-
- // Skip leading spaces.
- //
- for (; p != n && l[p] == ' '; p++) ;
-
- // Lines containing multiple prerequisites are 80 characters max.
- //
- string r;
- r.reserve (n);
-
- // Scan the next prerequisite while watching out for escape sequences.
- //
- for (; p != n && l[p] != ' '; p++)
- {
- char c (l[p]);
-
- if (c == '\\')
- c = l[++p];
-
- r += c;
- }
-
- // Skip trailing spaces.
- //
- for (; p != n && l[p] == ' '; p++) ;
-
- // Skip final '\'.
- //
- if (p == n - 1 && l[p] == '\\')
- p++;
-
- return r;
- }
-
- static void
- inject_prerequisites (action a, target& t, cxx& s, scope& ds)
- {
- tracer trace ("cxx::compile::inject_prerequisites");
-
- scope& rs (t.root_scope ());
- const string& cxx (rs["config.cxx"].as<const string&> ());
-
- cstrings args {cxx.c_str ()};
-
- // Add cxx.export.poptions from prerequisite libraries. Note
- // that here we don't need to see group members (see apply()).
- //
- for (prerequisite& p: group_prerequisites (t))
- {
- target& pt (*p.target); // Already searched and matched.
-
- if (pt.is_a<lib> () || pt.is_a<liba> () || pt.is_a<libso> ())
- append_lib_options (args, pt, "cxx.export.poptions");
- }
-
- append_options (args, t, "cxx.poptions");
-
- // @@ Some C++ options (e.g., -std, -m) affect the preprocessor.
- // Or maybe they are not C++ options? Common options?
- //
- append_options (args, t, "cxx.coptions");
-
- string std; // Storage.
- append_std (args, t, std);
-
- if (t.is_a<objso> ())
- args.push_back ("-fPIC");
-
- args.push_back ("-M"); // Note: -MM -MG skips missing <>-included.
- args.push_back ("-MG"); // Treat missing headers as generated.
- args.push_back ("-MQ"); // Quoted target name.
- args.push_back ("*"); // Old versions can't handle empty target name.
-
- // We are using absolute source file path in order to get absolute
- // paths in the result. Any relative paths in the result are non-
- // existent, potentially auto-generated headers.
- //
- // @@ We will also have to use absolute -I paths to guarantee
- // that. Or just detect relative paths and error out?
- //
- args.push_back (s.path ().string ().c_str ());
- args.push_back (nullptr);
-
- level5 ([&]{trace << "target: " << t;});
-
- // Build the prefix map lazily only if we have non-existent files.
- // Also reuse it over restarts since it doesn't change.
- //
- prefix_map pm;
-
- // If any prerequisites that we have extracted changed, then we
- // have to redo the whole thing. The reason for this is auto-
- // generated headers: the updated header may now include a yet-
- // non-existent header. Unless we discover this and generate it
- // (which, BTW, will trigger another restart since that header,
- // in turn, can also include auto-generated headers), we will
- // end up with an error during compilation proper.
- //
- // One complication with this restart logic is that we will see
- // a "prefix" of prerequisites that we have already processed
- // (i.e., they are already in our prerequisite_targets list) and
- // we don't want to keep redoing this over and over again. One
- // thing to note, however, is that the prefix that we have seen
- // on the previous run must appear exactly the same in the
- // subsequent run. The reason for this is that none of the files
- // that it can possibly be based on have changed and thus it
- // should be exactly the same. To put it another way, the
- // presence or absence of a file in the dependency output can
- // only depend on the previous files (assuming the compiler
- // outputs them as it encounters them and it is hard to think
- // of a reason why would someone do otherwise). And we have
- // already made sure that all those files are up to date. And
- // here is the way we are going to exploit this: we are going
- // to keep track of how many prerequisites we have processed so
- // far and on restart skip right to the next one.
- //
- // Also, before we do all that, make sure the source file itself
- // if up to date.
- //
- execute_direct (a, s);
-
- size_t skip_count (0);
- for (bool restart (true); restart; )
- {
- restart = false;
-
- if (verb >= 2)
- print_process (args);
-
- try
- {
- process pr (args.data (), false, false, true);
- ifdstream is (pr.in_ofd);
-
- size_t skip (skip_count);
- for (bool first (true), second (true); !(restart || is.eof ()); )
- {
- string l;
- getline (is, l);
-
- if (is.fail () && !is.eof ())
- fail << "io error while parsing g++ -M output";
-
- size_t pos (0);
-
- if (first)
- {
- // Empty output should mean the wait() call below will return
- // false.
- //
- if (l.empty ())
- break;
-
- assert (l[0] == '*' && l[1] == ':' && l[2] == ' ');
-
- first = false;
-
- // While normally we would have the source file on the
- // first line, if too long, it will be moved to the next
- // line and all we will have on this line is "*: \".
- //
- if (l.size () == 4 && l[3] == '\\')
- continue;
- else
- pos = 3; // Skip "*: ".
-
- // Fall through to the 'second' block.
- }
-
- if (second)
- {
- second = false;
- next (l, pos); // Skip the source file.
- }
-
- // If things go wrong (and they often do in this area), give
- // the user a bit extra context.
- //
- auto g (
- make_exception_guard (
- [](target& s)
- {
- info << "while extracting dependencies from " << s;
- },
- s));
-
- while (pos != l.size ())
- {
- string fs (next (l, pos));
-
- // Skip until where we left off.
- //
- if (skip != 0)
- {
- skip--;
- continue;
- }
-
- path f (move (fs));
- f.normalize ();
-
- if (!f.absolute ())
- {
- // This is probably as often an error as an auto-generated
- // file, so trace at level 3.
- //
- level3 ([&]{trace << "non-existent header '" << f << "'";});
-
- // If we already did it and build_prefix_map() returned empty,
- // then we would have failed below.
- //
- if (pm.empty ())
- pm = build_prefix_map (t);
-
- // First try the whole file. Then just the directory.
- //
- // @@ Has to be a separate map since the prefix can be
- // the same as the file name.
- //
- // auto i (pm.find (f));
-
- // Find the most qualified prefix of which we are a
- // sub-path.
- //
- auto i (pm.end ());
-
- if (!pm.empty ())
- {
- const dir_path& d (f.directory ());
- i = pm.upper_bound (d);
- --i; // Greatest less than.
-
- if (!d.sub (i->first)) // We might still not be a sub.
- i = pm.end ();
- }
-
- if (i == pm.end ())
- fail << "unable to map presumably auto-generated header '"
- << f << "' to a project";
-
- f = i->second / f;
- }
-
- level5 ([&]{trace << "injecting " << f;});
-
- // Split the name into its directory part, the name part, and
- // extension. Here we can assume the name part is a valid
- // filesystem name.
- //
- // Note that if the file has no extension, we record an empty
- // extension rather than NULL (which would signify that the
- // default extension should be added).
- //
- dir_path d (f.directory ());
- string n (f.leaf ().base ().string ());
- const char* es (f.extension ());
- const string* e (&extension_pool.find (es != nullptr ? es : ""));
-
- // Determine the target type.
- //
- const target_type* tt (nullptr);
-
- // See if this directory is part of any project out_root
- // hierarchy. Note that this will miss all the headers
- // that come from src_root (so they will be treated as
- // generic C headers below). Generally, we don't have
- // the ability to determine that some file belongs to
- // src_root of some project. But that's not a problem
- // for our purposes: it is only important for us to
- // accurately determine target types for headers that
- // could be auto-generated.
- //
- if (scope* r = scopes.find (d).root_scope ())
- {
- // Get cached (or build) a map of the extensions for the
- // C/C++ files this project is using.
- //
- const ext_map& m (build_ext_map (*r));
-
- auto i (m.find (e));
- if (i != m.end ())
- tt = i->second;
- }
-
- // If it is outside any project, or the project doesn't have
- // such an extension, assume it is a plain old C header.
- //
- if (tt == nullptr)
- tt = &h::static_type;
-
- // Find or insert target.
- //
- path_target& pt (
- static_cast<path_target&> (search (*tt, d, n, e, &ds)));
-
- // Assign path.
- //
- if (pt.path ().empty ())
- pt.path (move (f));
-
- // Match to a rule.
- //
- build::match (a, pt);
-
- // Update it.
- //
- // There would normally be a lot of headers for every source
- // file (think all the system headers) and this can get
- // expensive. At the same time, most of these headers are
- // existing files that we will never be updating (again,
- // system headers, for example) and the rule that will match
- // them is fallback file_rule. So we are going to do a little
- // fast-path optimization by detecting this common case.
- //
- recipe_function* const* recipe (
- pt.recipe (a).target<recipe_function*> ());
-
- if (recipe == nullptr || *recipe != &file_rule::perform_update)
- {
- // We only want to restart if our call to execute() actually
- // caused an update. In particular, the target could already
- // have been in target_state::changed because of a dependency
- // extraction run for some other source file.
- //
- target_state os (pt.state ());
- target_state ns (execute_direct (a, pt));
-
- if (ns != os && ns != target_state::unchanged)
- {
- level5 ([&]{trace << "updated " << pt << ", restarting";});
- restart = true;
- }
- }
-
- // Add to our prerequisite target list.
- //
- t.prerequisite_targets.push_back (&pt);
- skip_count++;
- }
- }
-
- // We may not have read all the output (e.g., due to a restart),
- // so close the file descriptor before waiting to avoid blocking
- // the other end.
- //
- is.close ();
-
- // We assume the child process issued some diagnostics.
- //
- if (!pr.wait ())
- throw failed ();
- }
- catch (const process_error& e)
- {
- error << "unable to execute " << args[0] << ": " << e.what ();
-
- // In a multi-threaded program that fork()'ed but did not exec(),
- // it is unwise to try to do any kind of cleanup (like unwinding
- // the stack and running destructors).
- //
- if (e.child ())
- exit (1);
-
- throw failed ();
- }
- }
- }
-
- target_state compile::
- perform_update (action a, target& xt)
- {
- path_target& t (static_cast<path_target&> (xt));
- cxx* s (execute_prerequisites<cxx> (a, t, t.mtime ()));
-
- if (s == nullptr)
- return target_state::unchanged;
-
- // Translate paths to relative (to working directory) ones. This
- // results in easier to read diagnostics.
- //
- path relo (relative (t.path ()));
- path rels (relative (s->path ()));
-
- scope& rs (t.root_scope ());
- const string& cxx (rs["config.cxx"].as<const string&> ());
-
- cstrings args {cxx.c_str ()};
-
- // Add cxx.export.poptions from prerequisite libraries. Note that
- // here we don't need to see group members (see apply()).
- //
- for (prerequisite& p: group_prerequisites (t))
- {
- target& pt (*p.target); // Already searched and matched.
-
- if (pt.is_a<lib> () || pt.is_a<liba> () || pt.is_a<libso> ())
- append_lib_options (args, pt, "cxx.export.poptions");
- }
-
- append_options (args, t, "cxx.poptions");
- append_options (args, t, "cxx.coptions");
-
- string std; // Storage.
- append_std (args, t, std);
-
- if (t.is_a<objso> ())
- args.push_back ("-fPIC");
-
- args.push_back ("-o");
- args.push_back (relo.string ().c_str ());
-
- args.push_back ("-c");
- args.push_back (rels.string ().c_str ());
-
- args.push_back (nullptr);
-
- if (verb)
- print_process (args);
- else
- text << "c++ " << *s;
-
- try
- {
- process pr (args.data ());
-
- if (!pr.wait ())
- throw failed ();
-
- // Should we go to the filesystem and get the new mtime? We
- // know the file has been modified, so instead just use the
- // current clock time. It has the advantage of having the
- // subseconds precision.
- //
- t.mtime (system_clock::now ());
- return target_state::changed;
- }
- catch (const process_error& e)
- {
- error << "unable to execute " << args[0] << ": " << e.what ();
-
- // In a multi-threaded program that fork()'ed but did not exec(),
- // it is unwise to try to do any kind of cleanup (like unwinding
- // the stack and running destructors).
- //
- if (e.child ())
- exit (1);
-
- throw failed ();
- }
- }
-
- // link
- //
- inline link::type link::
- link_type (target& t)
- {
- return t.is_a<exe> () ? type::e : (t.is_a<liba> () ? type::a : type::so);
- }
-
- link::order link::
- link_order (target& t)
- {
- const char* var;
-
- switch (link_type (t))
- {
- case type::e: var = "bin.exe.lib"; break;
- case type::a: var = "bin.liba.lib"; break;
- case type::so: var = "bin.libso.lib"; break;
- }
-
- const list_value& lv (t[var].as<const list_value&> ());
- return lv[0].value == "shared"
- ? lv.size () > 1 && lv[1].value == "static" ? order::so_a : order::so
- : lv.size () > 1 && lv[1].value == "shared" ? order::a_so : order::a;
- }
-
- match_result link::
- match (action a, target& t, const string& hint) const
- {
- tracer trace ("cxx::link::match");
-
- // @@ TODO:
- //
- // - check prerequisites: object files, libraries
- // - if path already assigned, verify extension?
- //
- // @@ Q:
- //
- // - if there is no .o, are we going to check if the one derived
- // from target exist or can be built? A: No.
- // What if there is a library. Probably ok if .a, not if .so.
- // (i.e., a utility library).
- //
-
- bool so (t.is_a<libso> ());
-
- // Scan prerequisites and see if we can work with what we've got.
- //
- bool seen_cxx (false), seen_c (false), seen_obj (false),
- seen_lib (false);
-
- for (prerequisite_member p: group_prerequisite_members (a, t))
- {
- if (p.is_a<cxx> ())
- {
- seen_cxx = seen_cxx || true;
- }
- else if (p.is_a<c> ())
- {
- seen_c = seen_c || true;
- }
- else if (p.is_a<obja> ())
- {
- if (so)
- fail << "shared library " << t << " prerequisite " << p
- << " is static object";
-
- seen_obj = seen_obj || true;
- }
- else if (p.is_a<objso> () ||
- p.is_a<obj> ())
- {
- seen_obj = seen_obj || true;
- }
- else if (p.is_a<liba> () ||
- p.is_a<libso> () ||
- p.is_a<lib> ())
- {
- seen_lib = seen_lib || true;
- }
- else if (p.is_a<h> () ||
- p.is_a<hxx> () ||
- p.is_a<ixx> () ||
- p.is_a<txx> () ||
- p.is_a<fsdir> ())
- ;
- else
- {
- level3 ([&]{trace << "unexpected prerequisite type " << p.type ();});
- return nullptr;
- }
- }
-
- // We will only chain a C source if there is also a C++ source or we
- // were explicitly told to.
- //
- if (seen_c && !seen_cxx && hint < "cxx")
- {
- level3 ([&]{trace << "c prerequisite(s) without c++ or hint";});
- return nullptr;
- }
-
- return seen_cxx || seen_c || seen_obj || seen_lib ? &t : nullptr;
- }
-
- recipe link::
- apply (action a, target& xt, const match_result&) const
- {
- tracer trace ("cxx::link::apply");
-
- path_target& t (static_cast<path_target&> (xt));
-
- type lt (link_type (t));
- bool so (lt == type::so);
- optional<order> lo; // Link-order.
-
- // Derive file name from target name.
- //
- if (t.path ().empty ())
- {
- switch (lt)
- {
- case type::e: t.derive_path ("" ); break;
- case type::a: t.derive_path ("a", "lib"); break;
- case type::so: t.derive_path ("so", "lib"); break;
- }
- }
-
- // Inject dependency on the output directory.
- //
- inject_parent_fsdir (a, t);
-
- // We may need the project roots for rule chaining (see below).
- // We will resolve them lazily only if needed.
- //
- scope* root (nullptr);
- const dir_path* out_root (nullptr);
- const dir_path* src_root (nullptr);
-
- // Process prerequisites: do rule chaining for C and C++ source
- // files as well as search and match.
- //
- // When cleaning, ignore prerequisites that are not in the same
- // or a subdirectory of our strong amalgamation.
- //
- const dir_path* amlg (
- a.operation () != clean_id
- ? nullptr
- : &t.strong_scope ().path ());
-
- for (prerequisite_member p: group_prerequisite_members (a, t))
- {
- bool group (!p.prerequisite.belongs (t)); // Group's prerequisite.
- target* pt (nullptr);
-
- if (!p.is_a<c> () && !p.is_a<cxx> ())
- {
- // The same basic logic as in search_and_match().
- //
- pt = &p.search ();
-
- if (a.operation () == clean_id && !pt->dir.sub (*amlg))
- continue; // Skip.
-
- // If this is the obj{} or lib{} target group, then pick the
- // appropriate member and make sure it is searched and matched.
- //
- if (obj* o = pt->is_a<obj> ())
- {
- pt = so ? static_cast<target*> (o->so) : o->a;
-
- if (pt == nullptr)
- pt = &search (so ? objso::static_type : obja::static_type,
- p.key ());
- }
- else if (lib* l = pt->is_a<lib> ())
- {
- // Determine the library type to link.
- //
- bool lso (true);
- const string& at ((*l)["bin.lib"].as<const string&> ());
-
- if (!lo)
- lo = link_order (t);
-
- switch (*lo)
- {
- case order::a:
- case order::a_so:
- lso = false; // Fall through.
- case order::so:
- case order::so_a:
- {
- if (lso ? at == "static" : at == "shared")
- {
- if (*lo == order::a_so || *lo == order::so_a)
- lso = !lso;
- else
- fail << (lso ? "shared" : "static") << " build of " << *l
- << " is not available";
- }
- }
- }
-
- pt = lso ? static_cast<target*> (l->so) : l->a;
-
- if (pt == nullptr)
- pt = &search (lso ? libso::static_type : liba::static_type,
- p.key ());
- }
-
- build::match (a, *pt);
- t.prerequisite_targets.push_back (pt);
- continue;
- }
-
- if (root == nullptr)
- {
- // Which scope shall we use to resolve the root? Unlikely,
- // but possible, the prerequisite is from a different project
- // altogether. So we are going to use the target's project.
- //
- root = &t.root_scope ();
- out_root = &root->path ();
- src_root = &root->src_path ();
- }
-
- const prerequisite_key& cp (p.key ()); // c(xx){} prerequisite key.
- const target_type& o_type (
- group
- ? obj::static_type
- : (so ? objso::static_type : obja::static_type));
-
- // Come up with the obj*{} target. The c(xx){} prerequisite
- // directory can be relative (to the scope) or absolute. If it is
- // relative, then use it as is. If it is absolute, then translate
- // it to the corresponding directory under out_root. While the
- // c(xx){} directory is most likely under src_root, it is also
- // possible it is under out_root (e.g., generated source).
- //
- dir_path d;
- {
- const dir_path& cpd (*cp.tk.dir);
-
- if (cpd.relative () || cpd.sub (*out_root))
- d = cpd;
- else
- {
- if (!cpd.sub (*src_root))
- fail << "out of project prerequisite " << cp <<
- info << "specify corresponding " << o_type.name << "{} "
- << "target explicitly";
-
- d = *out_root / cpd.leaf (*src_root);
- }
- }
-
- target& ot (search (o_type, d, *cp.tk.name, nullptr, cp.scope));
-
- // If we are cleaning, check that this target is in the same or
- // a subdirectory of our strong amalgamation.
- //
- if (a.operation () == clean_id && !ot.dir.sub (*amlg))
- {
- // If we shouldn't clean obj{}, then it is fair to assume
- // we shouldn't clean cxx{} either (generated source will
- // be in the same directory as obj{} and if not, well, go
- // find yourself another build system ;-)).
- //
- continue; // Skip.
- }
-
- // If we have created the obj{} target group, pick one of its
- // members; the rest would be primarily concerned with it.
- //
- if (group)
- {
- obj& o (static_cast<obj&> (ot));
- pt = so ? static_cast<target*> (o.so) : o.a;
-
- if (pt == nullptr)
- pt = &search (so ? objso::static_type : obja::static_type,
- o.dir, o.name, o.ext, nullptr);
- }
- else
- pt = &ot;
-
- // If this obj*{} target already exists, then it needs to be
- // "compatible" with what we are doing here.
- //
- // This gets a bit tricky. We need to make sure the source files
- // are the same which we can only do by comparing the targets to
- // which they resolve. But we cannot search the ot's prerequisites
- // -- only the rule that matches can. Note, however, that if all
- // this works out, then our next step is to match the obj*{}
- // target. If things don't work out, then we fail, in which case
- // searching and matching speculatively doesn't really hurt.
- //
- bool found (false);
- for (prerequisite_member p1:
- reverse_group_prerequisite_members (a, *pt))
- {
- // Ignore some known target types (fsdir, headers, libraries).
- //
- if (p1.is_a<fsdir> () ||
- p1.is_a<h> () ||
- (p.is_a<cxx> () && (p1.is_a<hxx> () ||
- p1.is_a<ixx> () ||
- p1.is_a<txx> ())) ||
- p1.is_a<lib> () ||
- p1.is_a<liba> () ||
- p1.is_a<libso> ())
- {
- continue;
- }
-
- if (!p1.is_a<cxx> ())
- fail << "synthesized target for prerequisite " << cp
- << " would be incompatible with existing target " << *pt <<
- info << "unexpected existing prerequisite type " << p1 <<
- info << "specify corresponding obj{} target explicitly";
-
- if (!found)
- {
- build::match (a, *pt); // Now p1 should be resolved.
-
- // Searching our own prerequisite is ok.
- //
- if (&p.search () != &p1.search ())
- fail << "synthesized target for prerequisite " << cp << " would "
- << "be incompatible with existing target " << *pt <<
- info << "existing prerequisite " << p1 << " does not match "
- << cp <<
- info << "specify corresponding " << o_type.name << "{} target "
- << "explicitly";
-
- found = true;
- // Check the rest of the prerequisites.
- }
- }
-
- if (!found)
- {
- // Note: add the source to the group, not the member.
- //
- ot.prerequisites.emplace_back (p.as_prerequisite (trace));
-
- // Add our lib*{} prerequisites to the object file (see
- // cxx.export.poptions above for details). Note: no need
- // to go into group members.
- //
- // Initially, we were only adding imported libraries, but
- // there is a problem with this approach: the non-imported
- // library might depend on the imported one(s) which we will
- // never "see" unless we start with this library.
- //
- for (prerequisite& p: group_prerequisites (t))
- {
- if (p.is_a<lib> () || p.is_a<liba> () || p.is_a<libso> ())
- ot.prerequisites.emplace_back (p);
- }
-
- build::match (a, *pt);
- }
-
- t.prerequisite_targets.push_back (pt);
- }
-
- switch (a)
- {
- case perform_update_id: return &perform_update;
- case perform_clean_id: return &perform_clean;
- default: return default_recipe; // Forward to prerequisites.
- }
- }
-
- target_state link::
- perform_update (action a, target& xt)
- {
- path_target& t (static_cast<path_target&> (xt));
-
- type lt (link_type (t));
- bool so (lt == type::so);
-
- if (!execute_prerequisites (a, t, t.mtime ()))
- return target_state::unchanged;
-
- // Translate paths to relative (to working directory) ones. This
- // results in easier to read diagnostics.
- //
- path relt (relative (t.path ()));
-
- scope& rs (t.root_scope ());
- cstrings args;
- string storage1;
-
- if (lt == type::a)
- {
- //@@ ranlib
- //
- args.push_back ("ar");
- args.push_back ("-rc");
- args.push_back (relt.string ().c_str ());
- }
- else
- {
- args.push_back (rs["config.cxx"].as<const string&> ().c_str ());
-
- append_options (args, t, "cxx.coptions");
-
- append_std (args, t, storage1);
-
- if (so)
- args.push_back ("-shared");
-
- args.push_back ("-o");
- args.push_back (relt.string ().c_str ());
-
- append_options (args, t, "cxx.loptions");
- }
-
- // Reserve enough space so that we don't reallocate. Reallocating
- // means pointers to elements may no longer be valid.
- //
- paths relo;
- relo.reserve (t.prerequisite_targets.size ());
-
- for (target* pt: t.prerequisite_targets)
- {
- path_target* ppt;
-
- if ((ppt = pt->is_a<obja> ()))
- ;
- else if ((ppt = pt->is_a<objso> ()))
- ;
- else if ((ppt = pt->is_a<liba> ()))
- ;
- else if ((ppt = pt->is_a<libso> ()))
- {
- // Use absolute path for the shared libraries since that's
- // the path the runtime loader will use to try to find it.
- // This is probably temporary until we get into the whole
- // -soname/-rpath mess.
- //
- args.push_back (ppt->path ().string ().c_str ());
- continue;
- }
- else
- continue;
-
- relo.push_back (relative (ppt->path ()));
- args.push_back (relo.back ().string ().c_str ());
- }
-
- if (lt != type::a)
- append_options (args, t, "cxx.libs");
-
- args.push_back (nullptr);
-
- if (verb)
- print_process (args);
- else
- text << "ld " << t;
-
- try
- {
- process pr (args.data ());
-
- if (!pr.wait ())
- throw failed ();
-
- // Should we go to the filesystem and get the new mtime? We
- // know the file has been modified, so instead just use the
- // current clock time. It has the advantage of having the
- // subseconds precision.
- //
- t.mtime (system_clock::now ());
- return target_state::changed;
- }
- catch (const process_error& e)
- {
- error << "unable to execute " << args[0] << ": " << e.what ();
-
- // In a multi-threaded program that fork()'ed but did not exec(),
- // it is unwise to try to do any kind of cleanup (like unwinding
- // the stack and running destructors).
- //
- if (e.child ())
- exit (1);
-
- throw failed ();
- }
- }
- }
-}