simplify GC_BUILD_DATE and GC_VERSION

Use gcc macros for __TIME__ and __DATE__ to compute build date.  This has the
advantage that we don't have to shell out to find the date, though it has the
disadvantage that it doesn't give us any control over format, nor does it
report the time zone.

By default, set GC_VERSION to "(developer build)".  For release versions,
specify GC_VERSION explicitly in gcconfig.pri like this:

  QMAKE_CXXFLAGS += -DGC_VERSION="'\"1.2.0\"'"

It would be nice to specify the git commit id in developer builds.  On the
other hand, the developer could always have uncommitted changes, so the git
commit id doesn't really make for a completely reproducible build.  It's also
a pain to get ahold of in Windows.

src/MainWindow.cpp

@@ -51,20 +51,8 @@
 #include "MetricAggregator.h"
 #include "SplitRideDialog.h"
 
-#ifdef WIN32
-    #include "temp_version.h"
-    #define GC_SVN_VERSION g_svnversion
-    #define GC_BUILD_DATE g_builddate
-
-#else
-    /* temp for the qmake/QMAKE_CXXFLAGS bug with xcode */
-    #ifndef GC_SVN_VERSION
-    #define GC_SVN_VERSION "0"
-    #endif
-    #ifndef GC_BUILD_DATE
-    #define GC_BUILD_DATE GC_SVN_VERSION
-#endif
-
+#ifndef GC_VERSION
+#define GC_VERSION "(developer build)"
 #endif
 
 #define FOLDER_TYPE 0
@@ -2024,9 +2012,8 @@ MainWindow::aboutDialog()
             "<h2>GoldenCheetah</h2>"
             "<i>Cycling Power Analysis Software for Linux, Mac, and Windows</i>"
             "<p><i>Build date: "
-            "") + QString(GC_BUILD_DATE).replace("_", " ") + ("</i>"
-            "<p><i>Version: "
-            "")+QString::number(GC_MAJOR_VER)+(".") +QString::number(GC_MINOR_VER)+(".")+QString::number(GC_BUILD_VER) + ("</i>"
+            "") + QString(__DATE__) + " " + QString(__TIME__) + "</i>"
+            "<p><i>Version: " + QString(GC_VERSION) + ("</i>"
             "<p>GoldenCheetah is licensed under the "
             "<a href=\"http://www.gnu.org/copyleft/gpl.html\">GNU General "
             "Public License</a>."

src/src.pro

@@ -11,11 +11,6 @@ QT += xml sql
 LIBS += $${QWT_LIB}
 LIBS += -lm
 
-!win32 {
-    QMAKE_CXXFLAGS += -DGC_BUILD_DATE="`date +'\"%a_%b_%d,_%Y\"'`"
-    QMAKE_CXXFLAGS += -DGC_SVN_VERSION=\\\"`svnversion . | cut -f '2' -d ':'`\\\"
-}
-
 !isEmpty( D2XX_INCLUDE ) {
   INCLUDEPATH += $${D2XX_INCLUDE}
   HEADERS += D2XX.h
@@ -29,10 +24,6 @@ LIBS += -lm
     SOURCES += SrmDevice.cpp
 }
 
-QMAKE_CXXFLAGS += -DGC_MAJOR_VER=1
-QMAKE_CXXFLAGS += -DGC_MINOR_VER=2
-QMAKE_CXXFLAGS += -DGC_BUILD_VER=0
-
 macx {
     LIBS += -framework Carbon
 }
@@ -42,6 +33,14 @@ macx {
     HEADERS += Serial.h
     SOURCES += Serial.cpp
 }
+win32 {
+    INCLUDEPATH += ./win32
+    LIBS += -lws2_32
+    QMAKE_LFLAGS = -Wl,--enable-runtime-pseudo-reloc \
+        -Wl,--script,win32/i386pe.x-no-rdata
+    //QMAKE_CXXFLAGS += -fdata-sections
+    RC_FILE = windowsico.rc
+}
 
 HEADERS += \
         AllPlot.h \
@@ -136,26 +135,5 @@ SOURCES += \
         ManualRideDialog.cpp \
         RideCalendar.cpp
 
-win32 {
-    INCLUDEPATH += ./win32
-
-    LIBS += -lws2_32
-
-    QMAKE_LFLAGS = -Wl,--enable-runtime-pseudo-reloc \
-        -Wl,--script,win32/i386pe.x-no-rdata
-    //QMAKE_CXXFLAGS += -fdata-sections
-    RC_FILE = windowsico.rc
-
-    QMAKE_EXTRA_TARGETS += revtarget
-    PRE_TARGETDEPS      += temp_version.h
-    revtarget.target     = temp_version.h
-    revtarget.commands   = @echo "const char * const g_builddate = \"$(shell date /t)\";" \
-                                 "const char * const g_svnversion = \"$(shell svnversion .)\";" > $$revtarget.target
-
-    # this line has to be after SOURCES and HEADERS is declared or it doesn't work
-    revtarget.depends = $$SOURCES $$HEADERS $$FORMS
-}
-
-
 RESOURCES = application.qrc