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// file : build2/cc/link-rule.hxx -*- C++ -*-
// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD2_CC_LINK_RULE_HXX
#define BUILD2_CC_LINK_RULE_HXX
#include <set>
#include <libbuild2/types.hxx>
#include <libbuild2/utility.hxx>
#include <libbuild2/rule.hxx>
#include <build2/cc/types.hxx>
#include <build2/cc/common.hxx>
namespace build2
{
namespace cc
{
class link_rule: public rule, virtual common
{
public:
link_rule (data&&);
struct match_result
{
bool seen_x = false;
bool seen_c = false;
bool seen_cc = false;
bool seen_obj = false;
bool seen_lib = false;
};
match_result
match (action, const target&, const target*, otype, bool) const;
virtual bool
match (action, target&, const string&) const override;
virtual recipe
apply (action, target&) const override;
target_state
perform_update (action, const target&) const;
target_state
perform_clean (action, const target&) const;
private:
friend class install_rule;
friend class libux_install_rule;
// Shared library paths.
//
struct libs_paths
{
// If any (except real) is empty, then it is the same as the next
// one. Except for load and intermediate, for which empty indicates
// that it is not used.
//
// Note that the paths must form a "hierarchy" with subsequent paths
// adding extra information as suffixes. This is relied upon by the
// clean pattern (see below).
//
// The libs{} path is always the real path. On Windows what we link
// to is the import library and the link path is empty.
//
path link; // What we link: libfoo.so
path load; // What we load (with dlopen() or similar)
path soname; // SONAME: libfoo-1.so, libfoo.so.1
path interm; // Intermediate: libfoo.so.1.2
const path* real; // Real: libfoo.so.1.2.3
inline const path&
effect_link () const {return link.empty () ? effect_soname () : link;}
inline const path&
effect_soname () const {return soname.empty () ? *real : soname;}
// Cleanup pattern used to remove previous versions. If empty, no
// cleanup is performed. The above (current) names are automatically
// filtered out.
//
path clean;
};
libs_paths
derive_libs_paths (file&, const char*, const char*) const;
struct match_data
{
// The "for install" condition is signalled to us by install_rule when
// it is matched for the update operation. It also verifies that if we
// have already been executed, then it was for install.
//
// This has an interesting implication: it means that this rule cannot
// be used to update targets during match. Specifically, we cannot be
// executed for group resolution purposes (not a problem) nor as part
// of the generated source update. The latter case can be a problem:
// imagine a code generator that itself may need to be updated before
// it can be used to re-generate some out-of-date source code. As an
// aside, note that even if we were somehow able to communicate the
// "for install" in this case, the result of such an update may not
// actually be "usable" (e.g., not runnable because of the missing
// rpaths). There is another prominent case where the result may not
// be usable: cross-compilation.
//
// So the current (admittedly fuzzy) thinking is that a project shall
// not try to use its own build for update since it may not be usable
// (because of cross-compilations, being "for install", etc). Instead,
// it should rely on another, "usable" build of itself (this, BTW, is
// related to bpkg's build-time vs run-time dependencies).
//
optional<bool> for_install;
bool binless; // Binary-less library.
size_t start; // Parallel prerequisites/prerequisite_targets start.
link_rule::libs_paths libs_paths;
};
// Library handling.
//
void
append_libraries (strings&,
const file&, bool, lflags,
const scope&, action, linfo) const;
void
hash_libraries (sha256&,
bool&, timestamp,
const file&, bool, lflags,
const scope&, action, linfo) const;
void
rpath_libraries (strings&,
const target&,
const scope&, action, linfo,
bool) const;
// Windows rpath emulation (windows-rpath.cxx).
//
struct windows_dll
{
const string& dll;
const string* pdb; // NULL if none.
string pdb_storage;
bool operator< (const windows_dll& y) const {return dll < y.dll;}
};
using windows_dlls = std::set<windows_dll>;
timestamp
windows_rpath_timestamp (const file&,
const scope&,
action, linfo) const;
windows_dlls
windows_rpath_dlls (const file&, const scope&, action, linfo) const;
void
windows_rpath_assembly (const file&, const scope&, action, linfo,
const string&,
timestamp,
bool) const;
// Windows-specific (windows-manifest.cxx).
//
pair<path, timestamp>
windows_manifest (const file&, bool rpath_assembly) const;
// pkg-config's .pc file generation (pkgconfig.cxx).
//
void
pkgconfig_save (action, const file&, bool, bool) const;
private:
const string rule_id;
};
}
}
#endif // BUILD2_CC_LINK_RULE_HXX
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