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authorBoris Kolpackov <boris@codesynthesis.com>2022-06-28 10:51:17 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2022-06-28 11:11:55 +0200
commitba8ddd80a4323eb85ee5a569295eb4e80986003f (patch)
tree09722bdb653de49dd2d732c4034f5ec1f5b93047 /libbuild2/cc
parent17af650e17fafd4d3fa2bf0e06253e15f4e5b9c3 (diff)
Complete support for saving/loading library metadata to/from pkg-config files
Diffstat (limited to 'libbuild2/cc')
-rw-r--r--libbuild2/cc/common.cxx236
-rw-r--r--libbuild2/cc/common.hxx10
-rw-r--r--libbuild2/cc/link-rule.cxx26
-rw-r--r--libbuild2/cc/link-rule.hxx5
-rw-r--r--libbuild2/cc/pkgconfig.cxx198
5 files changed, 308 insertions, 167 deletions
diff --git a/libbuild2/cc/common.cxx b/libbuild2/cc/common.cxx
index a320626..3b49d58 100644
--- a/libbuild2/cc/common.cxx
+++ b/libbuild2/cc/common.cxx
@@ -877,12 +877,13 @@ namespace build2
return pair<const mtime_target&, const target*> {t, g};
}
- // Note that pk's scope should not be NULL (even if dir is absolute).
+ // Action should be absent if called during the load phase. Note that pk's
+ // scope should not be NULL (even if dir is absolute).
//
// Note: see similar logic in find_system_library().
//
target* common::
- search_library (action act,
+ search_library (optional<action> act,
const dir_paths& sysd,
optional<dir_paths>& usrd,
const prerequisite_key& p,
@@ -890,7 +891,7 @@ namespace build2
{
tracer trace (x, "search_library");
- assert (p.scope != nullptr);
+ assert (p.scope != nullptr && (!exist || act));
context& ctx (p.scope->ctx);
const scope& rs (*p.scope->root_scope ());
@@ -1232,20 +1233,87 @@ namespace build2
if (exist)
return r;
- // If we cannot acquire the lock then this mean the target has already
- // been matched and we assume all of this has already been done.
+ // Try to extract library information from pkg-config. We only add the
+ // default macro if we could not extract more precise information. The
+ // idea is that in .pc files that we generate, we copy those macros (or
+ // custom ones) from *.export.poptions.
//
- auto lock = [act] (const target* t) -> target_lock
+ // @@ Should we add .pc files as ad hoc members so pkconfig_save() can
+ // use their names when deriving -l-names (this would be especially
+ // helpful for binless libraries to get hold of prefix/suffix, etc).
+ //
+ auto load_pc = [this, &trace,
+ act, &p, &name,
+ &sysd, &usrd,
+ pd, &pc, lt, a, s] (pair<bool, bool> metaonly)
{
- auto l (t != nullptr ? build2::lock (act, *t, true) : target_lock ());
+ l5 ([&]{trace << "loading pkg-config information during "
+ << (act ? "match" : "load") << " for "
+ << (a != nullptr ? "static " : "")
+ << (s != nullptr ? "shared " : "")
+ << "member(s) of " << *lt << "; metadata only: "
+ << metaonly.first << " " << metaonly.second;});
+
+ // Add the "using static/shared library" macro (used, for example, to
+ // handle DLL export). The absence of either of these macros would
+ // mean some other build system that cannot distinguish between the
+ // two (and no pkg-config information).
+ //
+ auto add_macro = [this] (target& t, const char* suffix)
+ {
+ // If there is already a value (either in cc.export or x.export),
+ // don't add anything: we don't want to be accumulating defines nor
+ // messing with custom values. And if we are adding, then use the
+ // generic cc.export.
+ //
+ // The only way we could already have this value is if this same
+ // library was also imported as a project (as opposed to installed).
+ // Unlikely but possible. In this case the values were set by the
+ // export stub and we shouldn't touch them.
+ //
+ if (!t.vars[x_export_poptions])
+ {
+ auto p (t.vars.insert (c_export_poptions));
- if (l && l.offset == target::offset_matched)
+ if (p.second)
+ {
+ // The "standard" macro name will be LIB<NAME>_{STATIC,SHARED},
+ // where <name> is the target name. Here we want to strike a
+ // balance between being unique and not too noisy.
+ //
+ string d ("-DLIB");
+
+ d += sanitize_identifier (
+ ucase (const_cast<const string&> (t.name)));
+
+ d += '_';
+ d += suffix;
+
+ strings o;
+ o.push_back (move (d));
+ p.first = move (o);
+ }
+ }
+ };
+
+ if (pc.first.empty () && pc.second.empty ())
{
- assert ((*t)[act].rule == &file_rule::rule_match);
- l.unlock ();
+ if (!pkgconfig_load (act, *p.scope,
+ *lt, a, s,
+ p.proj, name,
+ *pd, sysd, *usrd,
+ metaonly))
+ {
+ if (a != nullptr && !metaonly.first) add_macro (*a, "STATIC");
+ if (s != nullptr && !metaonly.second) add_macro (*s, "SHARED");
+ }
}
-
- return l;
+ else
+ pkgconfig_load (act, *p.scope,
+ *lt, a, s,
+ pc,
+ *pd, sysd, *usrd,
+ metaonly);
};
// Mark as a "cc" library (unless already marked) and set the system
@@ -1266,6 +1334,75 @@ namespace build2
return p.second;
};
+ // Deal with the load phase case. The rest is already hairy enough so
+ // let's not try to weave this logic into that.
+ //
+ if (!act)
+ {
+ assert (ctx.phase == run_phase::load);
+
+ // The overall idea here is to set everything up so that the default
+ // file_rule matches the returned targets, the same way as it would if
+ // multiple operations were executed for the normal case (see below).
+ //
+ timestamp mt (timestamp_nonexistent);
+ if (a != nullptr) {lt->a = a; a->group = lt; mt = a->mtime ();}
+ if (s != nullptr) {lt->s = s; s->group = lt; mt = s->mtime ();}
+
+ // @@ TODO: we currently always reload pkgconfig for lt (and below).
+ //
+ mark_cc (*lt);
+ lt->mtime (mt);
+
+ // We can only load metadata from here since we can only do this
+ // during the load phase. But it's also possible that a racing match
+ // phase already found and loaded this library without metadata. So
+ // looks like the only way is to load the metadata incrementally. We
+ // can base this decision on the presense/absense of cc.type and
+ // export.metadata.
+ //
+ pair<bool, bool> metaonly {false, false};
+
+ if (a != nullptr && !mark_cc (*a))
+ {
+ if (a->vars[ctx.var_export_metadata])
+ a = nullptr;
+ else
+ metaonly.first = true;
+ }
+
+ if (s != nullptr && !mark_cc (*s))
+ {
+ if (s->vars[ctx.var_export_metadata])
+ s = nullptr;
+ else
+ metaonly.second = true;
+ }
+
+ // Try to extract library information from pkg-config.
+ //
+ if (a != nullptr || s != nullptr)
+ load_pc (metaonly);
+
+ return r;
+ }
+
+ // If we cannot acquire the lock then this mean the target has already
+ // been matched and we assume all of this has already been done.
+ //
+ auto lock = [a = *act] (const target* t) -> target_lock
+ {
+ auto l (t != nullptr ? build2::lock (a, *t, true) : target_lock ());
+
+ if (l && l.offset == target::offset_matched)
+ {
+ assert ((*t)[a].rule == &file_rule::rule_match);
+ l.unlock ();
+ }
+
+ return l;
+ };
+
target_lock ll (lock (lt));
// Set lib{} group members to indicate what's available. Note that we
@@ -1275,12 +1412,15 @@ namespace build2
timestamp mt (timestamp_nonexistent);
if (ll)
{
- if (s != nullptr) {lt->s = s; mt = s->mtime ();}
if (a != nullptr) {lt->a = a; mt = a->mtime ();}
+ if (s != nullptr) {lt->s = s; mt = s->mtime ();}
// Mark the group since sometimes we use it itself instead of one of
// the liba/libs{} members (see process_libraries_impl() for details).
//
+ // @@ TODO: we currently always reload pkgconfig for lt (and above).
+ // Maybe pass NULL lt to pkgconfig_load() in this case?
+ //
mark_cc (*lt);
}
@@ -1299,77 +1439,11 @@ namespace build2
if (a != nullptr && !mark_cc (*a)) a = nullptr;
if (s != nullptr && !mark_cc (*s)) s = nullptr;
- // Add the "using static/shared library" macro (used, for example, to
- // handle DLL export). The absence of either of these macros would
- // mean some other build system that cannot distinguish between the
- // two (and no pkg-config information).
- //
- auto add_macro = [this] (target& t, const char* suffix)
- {
- // If there is already a value (either in cc.export or x.export),
- // don't add anything: we don't want to be accumulating defines nor
- // messing with custom values. And if we are adding, then use the
- // generic cc.export.
- //
- // The only way we could already have this value is if this same
- // library was also imported as a project (as opposed to installed).
- // Unlikely but possible. In this case the values were set by the
- // export stub and we shouldn't touch them.
- //
- if (!t.vars[x_export_poptions])
- {
- auto p (t.vars.insert (c_export_poptions));
-
- if (p.second)
- {
- // The "standard" macro name will be LIB<NAME>_{STATIC,SHARED},
- // where <name> is the target name. Here we want to strike a
- // balance between being unique and not too noisy.
- //
- string d ("-DLIB");
-
- d += sanitize_identifier (
- ucase (const_cast<const string&> (t.name)));
-
- d += '_';
- d += suffix;
-
- strings o;
- o.push_back (move (d));
- p.first = move (o);
- }
- }
- };
-
if (ll && (a != nullptr || s != nullptr))
{
- // Try to extract library information from pkg-config. We only add the
- // default macro if we could not extract more precise information. The
- // idea is that in .pc files that we generate, we copy those macros
- // (or custom ones) from *.export.poptions.
+ // Try to extract library information from pkg-config.
//
- // @@ Should we add .pc files as ad hoc members so pkconfig_save() can
- // use their names when deriving -l-names (this would be especially
- // helpful for binless libraries to get hold of prefix/suffix, etc).
- //
- if (pc.first.empty () && pc.second.empty ())
- {
- if (!pkgconfig_load (act, *p.scope,
- *lt, a, s,
- p.proj, name,
- *pd, sysd, *usrd,
- false /* metadata */))
- {
- if (a != nullptr) add_macro (*a, "STATIC");
- if (s != nullptr) add_macro (*s, "SHARED");
- }
- }
- else
- pkgconfig_load (act, *p.scope,
- *lt, a, s,
- pc,
- *pd, sysd, *usrd,
- false /* metadata */);
+ load_pc ({false, false} /* metaonly */);
}
// If we have the lock (meaning this is the first time), set the matched
diff --git a/libbuild2/cc/common.hxx b/libbuild2/cc/common.hxx
index 2aaa0d0..9c276f7 100644
--- a/libbuild2/cc/common.hxx
+++ b/libbuild2/cc/common.hxx
@@ -396,7 +396,7 @@ namespace build2
tracer&);
target*
- search_library (action,
+ search_library (optional<action>,
const dir_paths&,
optional<dir_paths>&,
const prerequisite_key&,
@@ -442,23 +442,23 @@ namespace build2
bool) const;
void
- pkgconfig_load (action, const scope&,
+ pkgconfig_load (optional<action>, const scope&,
bin::lib&, bin::liba*, bin::libs*,
const pair<path, path>&,
const dir_path&,
const dir_paths&,
const dir_paths&,
- bool) const;
+ pair<bool, bool>) const;
bool
- pkgconfig_load (action, const scope&,
+ pkgconfig_load (optional<action>, const scope&,
bin::lib&, bin::liba*, bin::libs*,
const optional<project_name>&,
const string&,
const dir_path&,
const dir_paths&,
const dir_paths&,
- bool) const;
+ pair<bool, bool>) const;
};
}
}
diff --git a/libbuild2/cc/link-rule.cxx b/libbuild2/cc/link-rule.cxx
index d0a1f4a..71d2055 100644
--- a/libbuild2/cc/link-rule.cxx
+++ b/libbuild2/cc/link-rule.cxx
@@ -1122,12 +1122,8 @@ namespace build2
{
// Handle imported libraries.
//
- // Note that since the search is rule-specific, we don't cache the
- // target in the prerequisite.
- //
if (p.proj ())
- pt = search_library (
- a, sys_lib_dirs, usr_lib_dirs, p.prerequisite);
+ pt = search_library (a, sys_lib_dirs, usr_lib_dirs, p.prerequisite);
// The rest is the same basic logic as in search_and_match().
//
@@ -4254,5 +4250,25 @@ namespace build2
return perform_clean_extra (a, t, extras, adhoc_extras);
}
+
+ const target* link_rule::
+ import (const prerequisite_key& pk,
+ const optional<string>&,
+ const location&) const
+ {
+ tracer trace (x, "link_rule::import");
+
+ // @@ TODO: do we want to make metadata loading optional?
+ //
+ optional<dir_paths> usr_lib_dirs;
+ const target* r (search_library (nullopt /* action */,
+ sys_lib_dirs, usr_lib_dirs,
+ pk));
+
+ if (r == nullptr)
+ l4 ([&]{trace << "unable to find installed library " << pk;});
+
+ return r;
+ }
}
}
diff --git a/libbuild2/cc/link-rule.hxx b/libbuild2/cc/link-rule.hxx
index 14a70d2..9b491c2 100644
--- a/libbuild2/cc/link-rule.hxx
+++ b/libbuild2/cc/link-rule.hxx
@@ -59,6 +59,11 @@ namespace build2
target_state
perform_clean (action, const target&, match_data&) const;
+ virtual const target*
+ import (const prerequisite_key&,
+ const optional<string>&,
+ const location&) const override;
+
public:
// Library handling.
//
diff --git a/libbuild2/cc/pkgconfig.cxx b/libbuild2/cc/pkgconfig.cxx
index 1fd96da..0ae4341 100644
--- a/libbuild2/cc/pkgconfig.cxx
+++ b/libbuild2/cc/pkgconfig.cxx
@@ -670,7 +670,7 @@ namespace build2
};
bool common::
- pkgconfig_load (action a,
+ pkgconfig_load (optional<action> act,
const scope& s,
lib& lt,
liba* at,
@@ -680,7 +680,7 @@ namespace build2
const dir_path& libd,
const dir_paths& top_sysd,
const dir_paths& top_usrd,
- bool meta) const
+ pair<bool, bool> metaonly) const
{
assert (at != nullptr || st != nullptr);
@@ -690,12 +690,16 @@ namespace build2
if (p.first.empty () && p.second.empty ())
return false;
- pkgconfig_load (a, s, lt, at, st, p, libd, top_sysd, top_usrd, meta);
+ pkgconfig_load (
+ act, s, lt, at, st, p, libd, top_sysd, top_usrd, metaonly);
return true;
}
+ // Action should be absent if called during the load phase. If metaonly is
+ // true then only load the metadata.
+ //
void common::
- pkgconfig_load (action a,
+ pkgconfig_load (optional<action> act,
const scope& s,
lib& lt,
liba* at,
@@ -704,7 +708,7 @@ namespace build2
const dir_path& libd,
const dir_paths& top_sysd,
const dir_paths& top_usrd,
- bool meta) const
+ pair<bool /* a */, bool /* s */> metaonly) const
{
tracer trace (x, "pkgconfig_load");
@@ -773,11 +777,11 @@ namespace build2
// Parse --libs into loptions/libs (interface and implementation). If
// ps is not NULL, add each resolved library target as a prerequisite.
//
- auto parse_libs = [a, &s, top_sysd, this] (target& t,
- bool binless,
- const pkgconf& pc,
- bool la,
- prerequisites* ps)
+ auto parse_libs = [this, act, &s, top_sysd] (target& t,
+ bool binless,
+ const pkgconf& pc,
+ bool la,
+ prerequisites* ps)
{
strings lops;
vector<name> libs;
@@ -1072,7 +1076,7 @@ namespace build2
dr << info (f) << "while resolving pkg-config dependency " << l;
});
- lt = search_library (a, top_sysd, usrd, pk);
+ lt = search_library (act, top_sysd, usrd, pk);
}
if (lt != nullptr)
@@ -1204,13 +1208,17 @@ namespace build2
// Parse user metadata and set extracted variables on the specified
// target.
//
- auto parse_metadata = [&next] (const target&,
+ auto parse_metadata = [&next] (target& t,
pkgconf& pc,
const string& md)
{
const location loc (pc.path);
+ context& ctx (t.ctx);
+ auto& vp (ctx.var_pool.rw ()); // Load phase.
+
optional<uint64_t> ver;
+ optional<string> pfx;
string s;
for (size_t b (0), e (0); !(s = next (md, b, e)).empty (); )
@@ -1223,7 +1231,8 @@ namespace build2
}
catch (const invalid_argument& e)
{
- fail (loc) << "invalid version in metadata variable; " << e;
+ fail (loc) << "invalid version in build2.metadata variable: "
+ << e;
}
if (*ver != 1)
@@ -1232,6 +1241,15 @@ namespace build2
continue;
}
+ if (!pfx)
+ {
+ if (s.empty ())
+ fail (loc) << "empty variable prefix in build2.metadata varible";
+
+ pfx = s;
+ continue;
+ }
+
// The rest is variable name/type pairs.
//
size_t p (s.find ('/'));
@@ -1239,17 +1257,13 @@ namespace build2
if (p == string::npos)
fail (loc) << "expected name/type pair instead of '" << s << "'";
- //@@ We cannot insert a variable since we are not in the load phase
- // (but if we were to somehow support immediate importation of
- // libraries, we would be in the load phase).
- //
- string var (s, 0, p);
+ string vn (s, 0, p);
string tn (s, p + 1);
- optional<string> val (pc.variable (var));
+ optional<string> val (pc.variable (vn));
if (!val)
- fail (loc) << "metadata variable " << var << " not set";
+ fail (loc) << "metadata variable " << vn << " not set";
pair<const value_type*, bool> vt (metadata_type (tn));
if (vt.first == nullptr)
@@ -1263,17 +1277,23 @@ namespace build2
: name (move (s)));
}
- value v (vt.first);
- v.assign (move (ns), nullptr /* @@ TODO: var */);
+ const variable& var (vp.insert (move (vn)));
- //names storage;
- //text << var << " = " << reverse (v, storage);
+ value& v (t.assign (var));
+ v.assign (move (ns), &var);
+ typify (v, *vt.first, &var);
}
if (!ver)
- fail (loc) << "version expected in metadata variable";
+ fail (loc) << "version expected in build2.metadata variable";
+
+ if (!pfx)
+ fail (loc) << "variable prefix expected in build2.metadata variable";
- // @@ TODO: we should probably also set export.metadata?
+ // Set export.metadata to indicate the presence of user metadata.
+ //
+ t.assign (ctx.var_export_metadata) = names {
+ name (std::to_string (*ver)), name (move (*pfx))};
};
// Parse modules, enter them as targets, and add them to the
@@ -1433,17 +1453,8 @@ namespace build2
}
};
- // For now we only populate prerequisites for lib{}. To do it for
- // liba{} would require weeding out duplicates that are already in
- // lib{}.
- //
- // Currently, this information is only used by the modules machinery to
- // resolve module names to module files (but we cannot only do this if
- // modules are enabled since the same installed library can be used by
- // multiple builds).
+ // Load the information from the pkg-config files.
//
- prerequisites prs;
-
pkgconf apc;
pkgconf spc;
@@ -1471,6 +1482,58 @@ namespace build2
if (ps || ap.empty ())
spc = pkgconf (sp, pc_dirs, sys_lib_dirs, sys_hdr_dirs);
+ // Load user metadata if we are in the load phase.
+ //
+ // Note also that we are not failing here if the metadata was requested
+ // but not present (potentially only partially) letting the caller
+ // (i.e., the import machinery) verify that the export.metadata was set
+ // on the target being imported. This would also allow supporting
+ // optional metadata.
+ //
+ if (!act)
+ {
+ // We can only do it during the load phase.
+ //
+ assert (lt.ctx.phase == run_phase::load);
+
+ pkgconf& ipc (ps ? spc : apc); // As below.
+
+ // Since it's not easy to say if things are the same, we load a copy
+ // into the group and each member, if any.
+ //
+ // @@ TODO: check if already loaded? Don't we have the same problem
+ // below with reloading the rest for lt? What if we passed NULL
+ // in this case (and I suppose another bool in metaonly)?
+ //
+ if (optional<string> md = ipc.variable ("build2.metadata"))
+ parse_metadata (lt, ipc, *md);
+
+ if (pa)
+ if (optional<string> md = apc.variable ("build2.metadata"))
+ parse_metadata (*at, apc, *md);
+
+ if (ps)
+ if (optional<string> md = spc.variable ("build2.metadata"))
+ parse_metadata (*st, spc, *md);
+
+ // If we only need metadata, then we are done.
+ //
+ if (at != nullptr && metaonly.first)
+ {
+ pa = false;
+ at = nullptr;
+ }
+
+ if (st != nullptr && metaonly.second)
+ {
+ ps = false;
+ st = nullptr;
+ }
+
+ if (at == nullptr && st == nullptr)
+ return;
+ }
+
// Sort out the interface dependencies (which we are setting on lib{}).
// If we have the shared .pc variant, then we use that. Otherwise --
// static but extract without the --static option (see also the saving
@@ -1478,6 +1541,17 @@ namespace build2
//
pkgconf& ipc (ps ? spc : apc); // Interface package info.
+ // For now we only populate prerequisites for lib{}. To do it for
+ // liba{} would require weeding out duplicates that are already in
+ // lib{}.
+ //
+ // Currently, this information is only used by the modules machinery to
+ // resolve module names to module files (but we cannot only do this if
+ // modules are enabled since the same installed library can be used by
+ // multiple builds).
+ //
+ prerequisites prs;
+
parse_libs (
lt,
(ps ? st->mtime () : at->mtime ()) == timestamp_unreal /* binless */,
@@ -1508,39 +1582,6 @@ namespace build2
}
}
- // Load user metadata, if requested.
- //
- // Note that we cannot just load if there is the metadata variable since
- // this could be some third-party .pc file which happens to set the same
- // variable.
- //
- // Note also that we are not failing here if the metadata was requested
- // but not present (potentially only partially) letting the caller
- // (i.e., the import machinery) verify that the export.metadata was set
- // on the target being imported. This would also allow supporting
- // optional metadata.
- //
- if (meta)
- {
- // We can only do it during the load phase.
- //
- assert (lt.ctx.phase == run_phase::load);
-
- // Since it's not easy to say if things are the same, we load a copy
- // into the group and each member, if any.
- //
- if (optional<string> md = ipc.variable ("metadata"))
- parse_metadata (lt, ipc, *md);
-
- if (pa)
- if (optional<string> md = apc.variable ("metadata"))
- parse_metadata (*at, apc, *md);
-
- if (ps)
- if (optional<string> md = spc.variable ("metadata"))
- parse_metadata (*st, spc, *md);
- }
-
// For now we assume static and shared variants export the same set of
// modules/importable headers. While technically possible, having
// different sets will most likely lead to all sorts of complications
@@ -1574,7 +1615,7 @@ namespace build2
}
bool common::
- pkgconfig_load (action,
+ pkgconfig_load (optional<action>,
const scope&,
lib&,
liba*,
@@ -1584,13 +1625,13 @@ namespace build2
const dir_path&,
const dir_paths&,
const dir_paths&,
- bool) const
+ pair<bool, bool>) const
{
return false;
}
void common::
- pkgconfig_load (action,
+ pkgconfig_load (optional<action>,
const scope&,
lib&,
liba*,
@@ -1599,7 +1640,7 @@ namespace build2
const dir_path&,
const dir_paths&,
const dir_paths&,
- bool) const
+ pair<bool, bool>) const
{
assert (false); // Should never be called.
}
@@ -2017,6 +2058,10 @@ namespace build2
// Save user metadata.
//
+ // @@ Maybe we should use build2.metadata as a general indication
+ // of the metadata being present. Having only version would
+ // indicate absense of user metadata.
+ //
{
// The export.metadata value should start with the version followed
// by the metadata variable prefix.
@@ -2100,11 +2145,12 @@ namespace build2
append (*l.group, true);
}
- // First write the `metadata` variable with the version and all
- // the variable names/types (which don't require any escaping).
+ // First write the build2.metadata variable with the version,
+ // prefix, and all the variable names/types (which should not
+ // require any escaping).
//
os << endl
- << "metadata = " << ver;
+ << "build2.metadata = " << ver << ' ' << pfx;
for (const binding& b: vars)
{