From f701aca96a0492b5d7fdea4425bff5ff12d343f3 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 4 Jul 2022 11:58:03 +0200
Subject: Factor libpkgconf-based pkgconfig implementation to separate source
 file

---
 libbuild2/cc/pkgconfig.hxx | 123 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 libbuild2/cc/pkgconfig.hxx

(limited to 'libbuild2/cc/pkgconfig.hxx')

diff --git a/libbuild2/cc/pkgconfig.hxx b/libbuild2/cc/pkgconfig.hxx
new file mode 100644
index 0000000..3ea9e2e
--- /dev/null
+++ b/libbuild2/cc/pkgconfig.hxx
@@ -0,0 +1,123 @@
+// file      : libbuild2/cc/pkgconfig.hxx -*- C++ -*-
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_CC_PKGCONFIG_HXX
+#define LIBBUILD2_CC_PKGCONFIG_HXX
+
+// In order not to complicate the bootstrap procedure with libpkg-config
+// building, exclude functionality that involves reading of .pc files.
+//
+#ifndef BUILD2_BOOTSTRAP
+
+#include <libpkgconf/libpkgconf.h>
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+namespace build2
+{
+  namespace cc
+  {
+    // Load package information from a .pc file. Filter out the -I/-L options
+    // that refer to system directories. This makes sure all the system search
+    // directories are "pushed" to the back which minimizes the chances of
+    // picking up wrong (e.g., old installed version) header/library.
+    //
+    // Note that the prerequisite package .pc files search order is as
+    // follows:
+    //
+    // - in the directory of the specified file
+    // - in pc_dirs directories (in the specified order)
+    //
+    // Issue diagnostics and throw failed on any errors.
+    //
+    class pkgconfig
+    {
+    public:
+      using path_type = build2::path;
+
+      path_type path;
+
+    public:
+      pkgconfig (path_type,
+                 const dir_paths& pc_dirs,
+                 const dir_paths& sys_hdr_dirs,
+                 const dir_paths& sys_lib_dirs);
+
+      // Create an unloaded/empty object. Querying package information on such
+      // an object is illegal.
+      //
+      pkgconfig () = default;
+      ~pkgconfig ();
+
+      // Movable-only type.
+      //
+      pkgconfig (pkgconfig&&);
+      pkgconfig& operator= (pkgconfig&&);
+
+      pkgconfig (const pkgconfig&) = delete;
+      pkgconfig& operator= (const pkgconfig&) = delete;
+
+      strings
+      cflags (bool static_) const;
+
+      strings
+      libs (bool static_) const;
+
+      optional<string>
+      variable (const char*) const;
+
+      optional<string>
+      variable (const string& s) const {return variable (s.c_str ());}
+
+    private:
+      void
+      free ();
+
+      // Keep them as raw pointers not to deal with API thread-unsafety in
+      // deleters and introducing additional mutex locks.
+      //
+      pkgconf_client_t* client_ = nullptr;
+      pkgconf_pkg_t* pkg_ = nullptr;
+    };
+
+    inline pkgconfig::
+    ~pkgconfig ()
+    {
+      if (client_ != nullptr) // Not empty.
+        free ();
+    }
+
+    inline pkgconfig::
+    pkgconfig (pkgconfig&& p)
+        : path (move (p.path)),
+          client_ (p.client_),
+          pkg_ (p.pkg_)
+    {
+      p.client_ = nullptr;
+      p.pkg_ = nullptr;
+    }
+
+    inline pkgconfig& pkgconfig::
+    operator= (pkgconfig&& p)
+    {
+      if (this != &p)
+      {
+        if (client_ != nullptr) // Not empty.
+          free ();
+
+        path = move (p.path);
+        client_ = p.client_;
+        pkg_ = p.pkg_;
+
+        p.client_ = nullptr;
+        p.pkg_ = nullptr;
+      }
+      return *this;
+    }
+  }
+}
+
+#endif // BUILD2_BOOTSTRAP
+
+#endif // LIBBUILD2_CC_PKGCONFIG_HXX
-- 
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