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