add $$shadowed() function

return the build directory corresponding to a given source directory.
this is the identity function if not shadow-building. if input lies
outside the source directory, return empty value.

Change-Id: I2d2a6b1112bd19989fe29cfe19a12d39a0d208c1
Reviewed-by: Marius Storm-Olsen <marius.storm-olsen@nokia.com>

6 files changed, 43 insertions, 2 deletions

diff --git a/qmake/main.cpp b/qmake/main.cpp
index 38e09f60fd..45672c67ee 100644
--- a/qmake/main.cpp
+++ b/qmake/main.cpp
@@ -163,6 +163,8 @@ int runQMake(int argc, char **argv)
                 fn = fn.right(fn.length() - di - 1);
             }
 
+            Option::prepareProject(fn);
+
             // read project..
             if(!project.read(fn)) {
                 fprintf(stderr, "Error processing project file: %s\n",
diff --git a/qmake/option.cpp b/qmake/option.cpp
index 836cc3f492..a22d184456 100644
--- a/qmake/option.cpp
+++ b/qmake/option.cpp
@@ -115,6 +115,8 @@ bool Option::mkfile::do_dep_heuristics = true;
 bool Option::mkfile::do_preprocess = false;
 bool Option::mkfile::do_stub_makefile = false;
 bool Option::mkfile::do_cache = true;
+QString Option::mkfile::source_root;
+QString Option::mkfile::build_root;
 QString Option::mkfile::cachefile;
 QStringList Option::mkfile::project_files;
 QString Option::mkfile::qmakespec_commandline;
@@ -594,6 +596,29 @@ void Option::applyHostMode()
    }
 }
 
+void Option::prepareProject(const QString &pfile)
+{
+    QString srcpath = (pfile != "-")
+            ? QDir::cleanPath(QFileInfo(pfile).absolutePath()) : qmake_getpwd();
+    if (srcpath != output_dir) {
+        if (!srcpath.endsWith(QLatin1Char('/')))
+            srcpath += QLatin1Char('/');
+        QString dstpath = output_dir;
+        if (!dstpath.endsWith(QLatin1Char('/')))
+            dstpath += QLatin1Char('/');
+        int srcLen = srcpath.length();
+        int dstLen = dstpath.length();
+        int lastSl = 0;
+        while (++lastSl, srcpath.at(--srcLen) == dstpath.at(--dstLen))
+            if (srcpath.at(srcLen) == QLatin1Char('/'))
+                lastSl = 1;
+        mkfile::source_root = srcpath.left(srcLen + lastSl);
+        mkfile::build_root = dstpath.left(dstLen + lastSl);
+    } else {
+        mkfile::source_root.clear();
+    }
+}
+
 bool Option::postProcessProject(QMakeProject *project)
 {
     Option::cpp_ext = project->variables()["QMAKE_EXT_CPP"];
diff --git a/qmake/option.h b/qmake/option.h
index f6f5dbbb9d..c58ef4aed0 100644
--- a/qmake/option.h
+++ b/qmake/option.h
@@ -109,6 +109,7 @@ struct Option
     //both of these must be called..
     static int init(int argc=0, char **argv=0); //parse cmdline
     static void applyHostMode();
+    static void prepareProject(const QString &pfile);
     static bool postProcessProject(QMakeProject *);
 
     enum StringFixFlags {
@@ -203,6 +204,8 @@ struct Option
         static bool do_dep_heuristics;
         static bool do_preprocess;
         static bool do_stub_makefile;
+        static QString source_root;
+        static QString build_root;
         static QString cachefile;
         static int cachefile_depth;
         static QStringList project_files;
diff --git a/qmake/project.cpp b/qmake/project.cpp
index 1df4bf0200..de010faeb8 100644
--- a/qmake/project.cpp
+++ b/qmake/project.cpp
@@ -81,7 +81,8 @@ enum ExpandFunc { E_MEMBER=1, E_FIRST, E_LAST, E_CAT, E_FROMFILE, E_EVAL, E_LIST
                   E_SPRINTF, E_JOIN, E_SPLIT, E_BASENAME, E_DIRNAME, E_SECTION,
                   E_FIND, E_SYSTEM, E_UNIQUE, E_QUOTE, E_ESCAPE_EXPAND,
                   E_UPPER, E_LOWER, E_FILES, E_PROMPT, E_RE_ESCAPE, E_VAL_ESCAPE, E_REPLACE,
-                  E_SIZE, E_SORT_DEPENDS, E_RESOLVE_DEPENDS, E_ENUMERATE_VARS };
+                  E_SIZE, E_SORT_DEPENDS, E_RESOLVE_DEPENDS, E_ENUMERATE_VARS,
+                  E_SHADOWED };
 QHash<QString, ExpandFunc> qmake_expandFunctions()
 {
     static QHash<QString, ExpandFunc> *qmake_expand_functions = 0;
@@ -117,6 +118,7 @@ QHash<QString, ExpandFunc> qmake_expandFunctions()
         qmake_expand_functions->insert("sort_depends", E_SORT_DEPENDS);
         qmake_expand_functions->insert("resolve_depends", E_RESOLVE_DEPENDS);
         qmake_expand_functions->insert("enumerate_vars", E_ENUMERATE_VARS);
+        qmake_expand_functions->insert("shadowed", E_SHADOWED);
     }
     return *qmake_expand_functions;
 }
@@ -2493,6 +2495,13 @@ QMakeProject::doProjectExpand(QString func, QList<QStringList> args_list,
     case E_ENUMERATE_VARS:
         ret += place.keys();
         break;
+    case E_SHADOWED: {
+        QString val = QDir::cleanPath(QFileInfo(args.at(0)).absoluteFilePath());
+        if (Option::mkfile::source_root.isEmpty())
+            ret += val;
+        else if (val.startsWith(Option::mkfile::source_root))
+            ret += Option::mkfile::build_root + val.mid(Option::mkfile::source_root.length());
+        break; }
     default: {
         fprintf(stderr, "%s:%d: Unknown replace function: %s\n",
                 parser.file.toLatin1().constData(), parser.line_no,
diff --git a/tests/auto/tools/qmake/testdata/functions/functions.pro b/tests/auto/tools/qmake/testdata/functions/functions.pro
index 7792859327..0b70b24158 100644
--- a/tests/auto/tools/qmake/testdata/functions/functions.pro
+++ b/tests/auto/tools/qmake/testdata/functions/functions.pro
@@ -112,3 +112,4 @@ in = easy "less easy" sca$${LITERAL_HASH}ry crazy$$escape_expand(\\t\\r\\n) $$es
 out = "easy \"less easy\" sca\$\${LITERAL_HASH}ry crazy\$\$escape_expand(\\\\t\\\\r\\\\n) \$\$escape_expand(\\\\t)shit \\\'no\\\"way\\\\here"
 testReplace($$val_escape(in), $$out, "val_escape")
 
+testReplace($$shadowed($$PWD/something), $$OUT_PWD/something, "shadowed")
diff --git a/tests/auto/tools/qmake/tst_qmake.cpp b/tests/auto/tools/qmake/tst_qmake.cpp
index 88ff10a764..1cdf0d7c7e 100644
--- a/tests/auto/tools/qmake/tst_qmake.cpp
+++ b/tests/auto/tools/qmake/tst_qmake.cpp
@@ -250,7 +250,8 @@ void tst_qmake::subdir_via_pro_file_extra_target()
 void tst_qmake::functions()
 {
     QString workDir = base_path + "/testdata/functions";
-    QVERIFY( test_compiler.qmake( workDir, "functions" ));
+    QString buildDir = base_path + "/testdata/functions_build";
+    QVERIFY( test_compiler.qmake( workDir, "functions", buildDir ));
 }
 
 void tst_qmake::operators()