properly replace windows paths in installed meta files

it's bogus in the first place that the meta files contain windows paths,
but straightening that out is a prohibitive effort. so instead generate
additional s/// commands which take care of these paths.

fwiw, the generated s///i command is a gnu extension. but as we are
doing this on windows only where we are using our built-in sed command
anyway, this should be fine.

Task-number: QTBUG-33794
Change-Id: I46fcc598db12816ee56b5371ab184f6277eb3a22
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

mkspecs/features/qt_module.prf

@@ -146,8 +146,10 @@ unix|win32-g++* {
       rplbase = $$MODULE_BASE_OUTDIR
    include_replace.match = $$rplbase/include
    include_replace.replace = $$[QT_INSTALL_HEADERS/raw]
+   include_replace.CONFIG = path
    lib_replace.match = $$rplbase/lib
    lib_replace.replace = $$QMAKE_PKGCONFIG_LIBDIR
+   lib_replace.CONFIG = path
    QMAKE_PKGCONFIG_INSTALL_REPLACE += include_replace lib_replace
    QMAKE_PRL_INSTALL_REPLACE += include_replace lib_replace
 }

qmake/generators/makefile.cpp

@@ -3336,6 +3336,13 @@ MakefileGenerator::writePkgConfigFile()
     t << endl;
 }
 
+static QString windowsifyPath(const QString &str)
+{
+    // The paths are escaped in prl files, so every slash needs to turn into two backslashes.
+    // Then each backslash needs to be escaped for sed. And another level for C quoting here.
+    return QString(str).replace('/', "\\\\\\\\");
+}
+
 QString MakefileGenerator::installMetaFile(const ProKey &replace_rule, const QString &src, const QString &dst)
 {
     QString ret;
@@ -3348,8 +3355,12 @@ QString MakefileGenerator::installMetaFile(const ProKey &replace_rule, const QSt
         for (int r = 0; r < replace_rules.size(); ++r) {
             const ProString match = project->first(ProKey(replace_rules.at(r) + ".match")),
                         replace = project->first(ProKey(replace_rules.at(r) + ".replace"));
-            if (!match.isEmpty() /*&& match != replace*/)
+            if (!match.isEmpty() /*&& match != replace*/) {
                 ret += " -e " + shellQuote("s," + match + "," + replace + ",g");
+                if (isWindowsShell() && project->first(ProKey(replace_rules.at(r) + ".CONFIG")).contains("path"))
+                    ret += " -e " + shellQuote("s," + windowsifyPath(match.toQString())
+                                               + "," + windowsifyPath(replace.toQString()) + ",gi");
+            }
         }
         ret += " \"" + src + "\" >\"" + dst + "\"";
     }

src/winmain/winmain.pro

@@ -34,5 +34,6 @@ wince*:QMAKE_POST_LINK =
 unix|win32-g++* {
     lib_replace.match = $$[QT_INSTALL_LIBS/get]
     lib_replace.replace = $$[QT_INSTALL_LIBS/raw]
+    lib_replace.CONFIG = path
     QMAKE_PRL_INSTALL_REPLACE += lib_replace
 }