pass user/maintainer provided CXXFLAGS to the Scintilla build process

 * Usually, Scintilla will now be built with -O2
 * this can improve performance significantly over the standard Scintilla -Os
   (up to 10%).
 * this also allows link-time-optimizing both Scintilla and SciTECO
   (which are linked statically) by adding -flto to CFLAGS, CXXFLAGS and LDFLAGS.
   Link-time-optimization will both reduce the total binary size
   and improve performance slightly since scintilla_send_message() can be
   inlined.
   An -O3 optimized Scintilla when linked with LTO results in an only 300kb
   larger SciTECO binary.
 * the highest possible optimization thus requires the following maintainer
   flags on the ./configure command line:
   CFLAGS="-O3 -mtune=native -march=native -flto"
   CXXFLAGS="-O3 -mtune=native -march=native -flto"
   LDFLAGS="-flto"
 * Windows and Debian builds use link-time-optimization now.
   On Windows - where we link in everything statically - building
   the dependant libraries with -flto could improve performance
   even more.
 * Debian builds respect the default hardening flags of the build
   server now. This should ensure that SciTECO is built for the
   correct architecture at the recommended optimization level etc.

1 files changed, 0 insertions, 3 deletions

diff --git a/TODO b/TODO
index 1349d4d..94ef048 100644
--- a/TODO
+++ b/TODO
@@ -184,9 +184,6 @@ Features:
    Use Autotest for instance.
 
 Optimizations:
- * Support link-time-optimization for Scintilla and SciTECO.
-   This could significantly improve performance esp. when linking
-   in everything statically as is done on Windows.
  * Instead of using RTTI to implement the immediate editing command
    behaviours in Cmdline::process_edit_cmd() depending on the current
    state, this could be modelled via virtual methods in State.