package/icu/0001-dont-build-static-dynamic-twice.patch

   1 Don't build object files twice
   2
   3 When passed --enable-static and --enable-shared, icu will generate
   4 both a shared and a static version of its libraries.
   5
   6 However, in order to do so, it builds each and every object file
   7 twice: once with -fPIC (for the shared library), and once without
   8 -fPIC (for the static library). While admittedly building -fPIC for a
   9 static library generates a slightly suboptimal code, this is what all
  10 the autotools-based project are doing. They build each object file
  11 once, and they use it for both the static and shared libraries.
  12
  13 icu builds the object files for the shared library as .o files, and
  14 the object files for static library as .ao files. By simply changing
  15 the suffix of object files used for static libraries to ".o", we tell
  16 icu to use the ones built for the shared library (i.e, with -fPIC),
  17 and avoid the double build of icu.
  18
  19 On a fast build server, this brings the target icu build from
  20 3m41.302s down to 1m43.926s (approximate numbers: some other builds
  21 are running on the system at the same time).
  22
  23 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  24
  25 Index: b/source/config/mh-linux
  26 ===================================================================
  27 --- a/source/config/mh-linux
  28 +++ b/source/config/mh-linux
  29 @@ -35,7 +35,7 @@
  30  ## Shared object suffix
  31  SO = so
  32  ## Non-shared intermediate object suffix
  33 -STATIC_O = ao
  34 +STATIC_O = o
  35
  36  ## Compilation rules
  37  %.$(STATIC_O): $(srcdir)/%.c