c++ - compiling wxWidgets with c++0x flags -

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while trying compile wxwidgets-2.9.1 source c++0x flags using gcc-4.6. came across error

narrowing conversion of '128' 'int' 'char' inside { } [-fpermissive] in file src/gtk/dcclient.cpp. error comes following files:

  1. src/gtk/bdiag.xbm
  2. src/gtk/cdiag.xbm
  3. src/gtk/fdiag.xbm
  4. src/gtk/horiz.xbm
  5. src/gtk/verti.xbm
  6. src/gtk/cross.xbm

this known bug. http://trac.wxwidgets.org/ticket/12575 did required , program compiling okay.

basically, there 2 kinds of fix diff file has

//in file dcclient.h

  1. hatches[i] = gdk_bitmap_create_from_data(null, bdiag_bits, bdiag_width, bdiag_height); hatches[i] = gdk_bitmap_create_from_data(null, reinterpret_cast< const char* >(bdiag_bits), bdiag_width, bdiag_height);

    //in file bdiag.xbm , similar fixes in *.xbm files

  2. static char bdiag_bits[] = {

    static unsigned char bdiag_bits[] = { 0x80, 0x80, 0x40, 0x40, 0x20, 0x20, 0x10, 0x10, 0x08, 0x08, 0x04, 0x04, 0x02, 0x02, 0x01, 0x01, 0x80, 0x80, 0x40, 0x40, 0x20, 0x20, 0x10, 0x10, 0x08, 0x08, 0x04, 0x04, 0x02, 0x02, 0x01, 0x01};

i understand second fix not understand first one. why need reinterpret_cast< const char* > function gdk_bitmap_create_from_data declared this:

typedef char   gchar;//in other header file

gdkbitmap* gdk_bitmap_create_from_data (gdkdrawable *drawable, const gchar *data, gint width, gint height);

while few lines later in same file dcclient.cpp following call gdk_bitmap_create_from_data doesn't give error.

char* data = new char[data_size]; //... gdkpixmap* pixmap = gdk_bitmap_create_from_data(mask, data, dst_w, dst_h);

now here no typecast required. why need reinterpret_cast on static unsigned char*?

unsigned char, signed char , char (also known 'plain char') 3 different types. there no conversion between unsigned char* , char*.


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