[Mesa-dev] [PATCH 7/7] i965/build: Add configure option to build i965_dri.so for a single Gen.

[Matt Turner]

Allows the compiler to cut dead code and simplify when we know the
driver will run on a single platform. Perhaps useful for distributions
wanting to ship new hardware support without the risk involved in
updating Mesa for existing hardware.
---
 configure.ac                          | 11 +++++++++++
 src/mesa/drivers/dri/i965/Makefile.am |  6 ++++++
 2 files changed, 17 insertions(+)

diff --git a/configure.ac b/configure.ac
index d897ac6..4b27455 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1197,6 +1197,17 @@ AM_CONDITIONAL(NEED_LIBMESA, test "x$enable_xlib_glx" = xyes -o \
                                   -n "$DRI_DIRS")
 
 dnl
+dnl i965 Generation configuration
+dnl
+AC_ARG_ENABLE([only-i965-gen],
+    [AS_HELP_STRING([--enable-only-i965-gen={4,5,6,7,8,...}],
+        [Builds i965_dri.so with support for only one generation @<:@default=all supported@:>@])],
+    [enable_only_i965_gen="$enableval"],
+    [enable_only_i965_gen=""])
+AC_SUBST([I965_GEN], "$enable_only_i965_gen")
+AM_CONDITIONAL(I965_SINGLE_GEN, test -n "$enable_only_i965_gen")
+
+dnl
 dnl OSMesa configuration
 dnl
 
diff --git a/src/mesa/drivers/dri/i965/Makefile.am b/src/mesa/drivers/dri/i965/Makefile.am
index 53ca47d..721c9ef 100644
--- a/src/mesa/drivers/dri/i965/Makefile.am
+++ b/src/mesa/drivers/dri/i965/Makefile.am
@@ -23,8 +23,14 @@
 
 include Makefile.sources
 
+if I965_SINGLE_GEN
+AM_CPPFLAGS = \
+	-DSTATIC_GEN=$(I965_GEN) \
+	-DGEN='((void) brw, STATIC_GEN)'
+else
 AM_CPPFLAGS = \
 	-DGEN='brw->gen'
+endif
 
 AM_CFLAGS = \
 	-I$(top_srcdir)/include \
-- 
1.8.3.2