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Pass --always to git describe.

This generates a useful version string even for --depth=1 checkouts.
The option was added in git v1.6.6.

--- a/update_version

+++ b/update_version

@@ -34,7 +34,8 @@

 # -dirty from files that have been touched but are not actually altered in the

 # working dir.

 GIT_VERSION=$(cd "$SRCDIR" && git status > /dev/null 2>&1 \

-                           && git describe --tags --match 'v*' --dirty 2> /dev/null)

+                           && git describe --tags --match 'v*' \

+                                           --always --dirty 2> /dev/null)

 GIT_VERSION=${GIT_VERSION#v}

 if [ -n "$GIT_VERSION" ]; then

--- a/win32/genversion.bat

+++ b/win32/genversion.bat

@@ -2,7 +2,7 @@

 setlocal enableextensions enabledelayedexpansion

-for /f %%v in ('git --git-dir="%~dp0..\.git" describe --tags --match "v*"') do set version=%%v

+for /f %%v in ('git --git-dir="%~dp0..\.git" describe --tags --match "v*" --always --dirty') do set version=%%v

 if not "%version%"=="" goto :gotversion

@@ -43,4 +43,4 @@

 :exit

-del "%1_temp"

\ No newline at end of file

+del "%1_temp"