Allow linking against system quazip library

When 'system_quazip' is added to CONFIG, chessx will now (dynamically)
link against the quazip library installed on the system, rather than
using the bundled version. Default behavior remains unchanged.

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>

Author: Ondrej Mosnacek

chessx.pro

@@ -36,7 +36,6 @@ sound {
   QT += multimedia
 }
 
-DEFINES += QUAZIP_STATIC
 DEFINES += QT_NO_CAST_TO_ASCII
 DEFINES *= QT_USE_QSTRINGBUILDER
 
@@ -79,6 +78,50 @@ unix|!macx {
     binfiles.path = $$BINDIR
 }
 
+system_quazip {
+  unix {
+    CONFIG += link_pkgconfig
+    PKGCONFIG += quazip1-qt5
+  }
+  else: error("Cannot use system_quazip on this platform!")
+}
+else {
+  HEADERS += \
+      src/quazip/JlCompress.h \
+      src/quazip/crypt.h \
+      src/quazip/ioapi.h \
+      src/quazip/quaadler32.h \
+      src/quazip/quachecksum32.h \
+      src/quazip/quacrc32.h \
+      src/quazip/quagzipfile.h \
+      src/quazip/quaziodevice.h \
+      src/quazip/quazip.h \
+      src/quazip/quazip_global.h \
+      src/quazip/quazipdir.h \
+      src/quazip/quazipfile.h \
+      src/quazip/quazipfileinfo.h \
+      src/quazip/quazipnewinfo.h \
+      src/quazip/unzip.h \
+      src/quazip/zip.h
+
+  SOURCES += \
+      src/quazip/JlCompress.cpp \
+      src/quazip/qioapi.cpp \
+      src/quazip/quaadler32.cpp \
+      src/quazip/quacrc32.cpp \
+      src/quazip/quagzipfile.cpp \
+      src/quazip/quaziodevice.cpp \
+      src/quazip/quazip.cpp \
+      src/quazip/quazipdir.cpp \
+      src/quazip/quazipfile.cpp \
+      src/quazip/quazipnewinfo.cpp \
+      src/quazip/unzip.cpp \
+      src/quazip/zip.cpp
+
+  INCLUDEPATH += src/quazip
+  DEFINES += QUAZIP_STATIC
+}
+
 scid {
   # Scid sources
   HEADERS += \
@@ -325,23 +368,7 @@ HEADERS += src/database/board.h \
   src/gui/textbrowserex.h \
   src/gui/textedit.h \
   src/gui/toolmainwindow.h \
-  src/gui/translatingslider.h \
-  src/quazip/JlCompress.h \
-  src/quazip/crypt.h \
-  src/quazip/ioapi.h \
-  src/quazip/quaadler32.h \
-  src/quazip/quachecksum32.h \
-  src/quazip/quacrc32.h \
-  src/quazip/quagzipfile.h \
-  src/quazip/quaziodevice.h \
-  src/quazip/quazip.h \
-  src/quazip/quazip_global.h \
-  src/quazip/quazipdir.h \
-  src/quazip/quazipfile.h \
-  src/quazip/quazipfileinfo.h \
-  src/quazip/quazipnewinfo.h \
-  src/quazip/unzip.h \
-  src/quazip/zip.h
+  src/gui/translatingslider.h
 
 SOURCES += \
   src/database/analysis.cpp \
@@ -490,26 +517,13 @@ SOURCES += \
   src/gui/testadapter.cpp \
   src/gui/textedit.cpp \
   src/gui/toolmainwindow.cpp \
-  src/gui/translatingslider.cpp \
-  src/quazip/JlCompress.cpp \
-  src/quazip/qioapi.cpp \
-  src/quazip/quaadler32.cpp \
-  src/quazip/quacrc32.cpp \
-  src/quazip/quagzipfile.cpp \
-  src/quazip/quaziodevice.cpp \
-  src/quazip/quazip.cpp \
-  src/quazip/quazipdir.cpp \
-  src/quazip/quazipfile.cpp \
-  src/quazip/quazipnewinfo.cpp \
-  src/quazip/unzip.cpp \
-  src/quazip/zip.cpp
+  src/gui/translatingslider.cpp
 
 TEMPLATE = app
 INCLUDEPATH += src/database
 INCLUDEPATH += src/guess
 INCLUDEPATH += src/gui
 INCLUDEPATH += src/dialogs
-INCLUDEPATH += src/quazip
 INCLUDEPATH += $$[QT_INSTALL_PREFIX]/src/3rdparty/zlib
 
 win32 {

src/gui/mainwindow.cpp

@@ -48,8 +48,6 @@
 #include "output.h"
 #include "pgndatabase.h"
 #include "playerlistwidget.h"
-#include "quazip.h"
-#include "quazipfile.h"
 #include "savedialog.h"
 #include "settings.h"
 #include "style.h"
@@ -60,6 +58,14 @@
 #include "translatingslider.h"
 #include "version.h"
 
+#ifdef QUAZIP_STATIC
+#include "quazip.h"
+#include "quazipfile.h"
+#else
+#include <quazip/quazip.h>
+#include <quazip/quazipfile.h>
+#endif
+
 #include <time.h>
 
 #include <QApplication>