[PATCH i-g-t 4/4] build: Add an option to not use the git hash in version

[Damien Lespiau <damien.lespiau@intel.com>]

When developing, it's quite annoying that the version changes every
commit, causing the library to be rebuild and everything single binary
re-linked.

Add a config option to skip that.

I remember Ville asking for this "feature" as well.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
---
 configure.ac         | 7 +++++++
 lib/Makefile.sources | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/configure.ac b/configure.ac
index 4208f00..caa3f50 100644
--- a/configure.ac
+++ b/configure.ac
@@ -212,6 +212,13 @@ if test "x$enable_debug" = xyes; then
 	AC_SUBST([DEBUG_CFLAGS])
 fi
 
+# prevent relinking the world on every commit for developpers
+AC_ARG_ENABLE(skip-version,
+	      AS_HELP_STRING([--enable-skip-version],
+			     [Do not use git hash in version]),
+	      [skip_version=$enableval], [skip_version=no])
+AM_CONDITIONAL(SKIP_VERSION, [test "x$skip_version" = xyes])
+
 # -----------------------------------------------------------------------------
 
 # To build multithread code, gcc uses -pthread, Solaris Studio cc uses -mt
diff --git a/lib/Makefile.sources b/lib/Makefile.sources
index f8a1b92..2148684 100644
--- a/lib/Makefile.sources
+++ b/lib/Makefile.sources
@@ -60,6 +60,10 @@ libintel_tools_la_SOURCES = 	\
 
 .PHONY: version.h.tmp
 
+if SKIP_VERSION
+$(IGT_LIB_PATH)/version.h.tmp:
+	@echo '#define IGT_GIT_SHA1 "SKIP"' >> $@
+else
 $(IGT_LIB_PATH)/version.h.tmp:
 	@touch $@
 	@if test -d $(GPU_TOOLS_PATH)/.git; then \
@@ -73,6 +77,7 @@ $(IGT_LIB_PATH)/version.h.tmp:
 	else \
 		echo '#define IGT_GIT_SHA1 "NOT-GIT"' ; \
 	fi >> $@
+endif # SKIP_VERSION
 
 
 $(IGT_LIB_PATH)/version.h: $(IGT_LIB_PATH)/version.h.tmp
-- 
2.1.0

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