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configure - add warning when enabling xcb

This commit is contained in:
Carsten Haitzler 2013-12-30 09:14:50 +09:00
parent b25df71d57
commit 641b914c0a
1 changed files with 24 additions and 0 deletions
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24
configure.ac
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@ -4042,3 +4042,27 @@ if test "x${have_systemd_pkg}" = "xyes" -a "x${want_systemd}" = "xno"; then
echo " ||----w |"
echo " || ||"
fi
if test "x${with_x11}" = "xxcb"; then
echo "_____________________________________________________________________"
echo "!!-- WARNING --!!"
echo "_____________________________________________________________________"
echo "You have chosen to use XCB instead of Xlib. It is a myth that XCB"
echo "is amazingly faster than Xlib (when used sensibly). It can be"
echo "faster in a few corner cases on startup of an app, but it comes"
echo "with many downsides. One of those is more complex code inside"
echo "ecore_x, which is far less tested in XCB mode than Xlib. Also"
echo "the big catch is that OpenGL suppot basically requires Xlib anyway"
echo "so if you want OpenGL in X11, you need Xlib regardless and so you"
echo "gain nothing really in terms of speed and no savings in memory"
echo "because Xlib is still linked, loaded and used, BUT instead you"
echo "have OpenGL drivers working with an hybrid XCB/Xlib (mostly XCB)"
echo "toolkit and this is basically never tested by anyone working on"
echo "the OpenGL drivers, so you will have bugs. Do not enable XCB"
echo "and use OpenGL. XCB is only useful if you wish to shave a few Kb"
echo "off the memory footprint of a whole system and live with less"
echo "tested code, and possibly unimplemented features in ecore_x. To"
echo "remove the XCB setup, remove the --with-x11=xcb optiomn to"
echo "configure."
echo "_____________________________________________________________________"
fi