[vala] compiler: Support configurable pkg-config command so can cross compile

[Luca Bruno <lucabru src gnome org>]

commit 7a48bd244dda8beea79e2da72f9c482326e855ff
Author: Robert Ancell <robert ancell canonical com>
Date:   Wed Dec 19 11:04:49 2012 +1300

    compiler: Support configurable pkg-config command so can cross compile
    
    Fixes bug 690456

 codegen/valaccodecompiler.vala |   14 +++++++++-----
 compiler/valacompiler.vala     |    9 +++++++--
 2 files changed, 16 insertions(+), 7 deletions(-)
---
diff --git a/codegen/valaccodecompiler.vala b/codegen/valaccodecompiler.vala
index b192760..1ad3f08 100644
--- a/codegen/valaccodecompiler.vala
+++ b/codegen/valaccodecompiler.vala
@@ -29,8 +29,8 @@ public class Vala.CCodeCompiler {
        public CCodeCompiler () {
        }
 
-       static bool package_exists(string package_name) {
-               string pc = "pkg-config --exists " + package_name;
+       static bool package_exists(string package_name, string? pkg_config_command = "pkg-config") {
+               string pc = pkg_config_command + " --exists " + package_name;
                int exit_status;
 
                try {
@@ -48,10 +48,14 @@ public class Vala.CCodeCompiler {
         *
         * @param context a code context
         */
-       public void compile (CodeContext context, string? cc_command, string[] cc_options) {
+       public void compile (CodeContext context, string? cc_command, string[] cc_options, string? 
pkg_config_command = null) {
                bool use_pkgconfig = false;
 
-               string pc = "pkg-config --cflags";
+               if (pkg_config_command == null) {
+                       pkg_config_command = "pkg-config";
+               }
+
+               string pc = pkg_config_command + " --cflags";
                if (!context.compile_only) {
                        pc += " --libs";
                }
@@ -61,7 +65,7 @@ public class Vala.CCodeCompiler {
                        pc += " gthread-2.0";
                }
                foreach (string pkg in context.get_packages ()) {
-                       if (package_exists (pkg)) {
+                       if (package_exists (pkg, pkg_config_command)) {
                                use_pkgconfig = true;
                                pc += " " + pkg;
                        }
diff --git a/compiler/valacompiler.vala b/compiler/valacompiler.vala
index 0962bac..6ac1e1c 100644
--- a/compiler/valacompiler.vala
+++ b/compiler/valacompiler.vala
@@ -71,6 +71,7 @@ class Vala.Compiler {
        static string cc_command;
        [CCode (array_length = false, array_null_terminated = true)]
        static string[] cc_options;
+       static string pkg_config_command;
        static string dump_tree;
        static bool save_temps;
        [CCode (array_length = false, array_null_terminated = true)]
@@ -131,6 +132,7 @@ class Vala.Compiler {
                { "enable-gobject-tracing", 0, 0, OptionArg.NONE, ref gobject_tracing, "Enable GObject 
creation tracing", null },
                { "cc", 0, 0, OptionArg.STRING, ref cc_command, "Use COMMAND as C compiler command", 
"COMMAND" },
                { "Xcc", 'X', 0, OptionArg.STRING_ARRAY, ref cc_options, "Pass OPTION to the C compiler", 
"OPTION..." },
+               { "pkg-config", 0, 0, OptionArg.STRING, ref pkg_config_command, "Use COMMAND as pkg-config 
command", "COMMAND" },
                { "dump-tree", 0, 0, OptionArg.FILENAME, ref dump_tree, "Write code tree to FILE", "FILE" },
                { "save-temps", 0, 0, OptionArg.NONE, ref save_temps, "Keep temporary files", null },
                { "profile", 0, 0, OptionArg.STRING, ref profile, "Use the given profile instead of the 
default", "PROFILE" },
@@ -442,10 +444,13 @@ class Vala.Compiler {
                        if (cc_command == null && Environment.get_variable ("CC") != null) {
                                cc_command = Environment.get_variable ("CC");
                        }
+                       if (pkg_config_command == null && Environment.get_variable ("PKG_CONFIG") != null) {
+                               pkg_config_command = Environment.get_variable ("PKG_CONFIG");
+                       }
                        if (cc_options == null) {
-                               ccompiler.compile (context, cc_command, new string[] { });
+                               ccompiler.compile (context, cc_command, new string[] { }, pkg_config_command);
                        } else {
-                               ccompiler.compile (context, cc_command, cc_options);
+                               ccompiler.compile (context, cc_command, cc_options, pkg_config_command);
                        }
                }