diff options
Diffstat (limited to 'libbuild2/cc/common.cxx')
| -rw-r--r-- | libbuild2/cc/common.cxx | 236 |
1 files changed, 155 insertions, 81 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 |