[build] Use dynamic versioning same way as PulseAudio.

Makefile.am

@@ -1,3 +1,10 @@
 SUBDIRS = src
 
 ACLOCAL_AMFLAGS = -I m4
+
+$(top_srcdir)/.version:
+	echo $(VERSION) > $@-t && mv $@-t $@
+
+dist-hook:
+	echo $(VERSION) > $(distdir)/.tarball-version
+	echo $(VERSION) > $(distdir)/.version

configure.ac

@@ -1,15 +1,15 @@
 AC_PREREQ(2.60)
 
-m4_define(PA_MAJOR, [5])
+AC_INIT([pulseaudio-modules-droid], [m4_esyscmd(./git-version-gen .tarball-version)], [mer-general@lists.merproject.org])
-m4_define(PA_MINOR, [0])
-m4_define(NEMO_MICRO, [33])
-
-AC_INIT([pulseaudio-modules-droid], [PA_MAJOR.PA_MINOR.NEMO_MICRO], [mer-general@lists.merproject.org])
 AC_CONFIG_HEADER([config.h])
 AM_INIT_AUTOMAKE([foreign -Wall silent-rules])
 AC_CONFIG_MACRO_DIR(m4)
 AM_SILENT_RULES([yes])
 
+AS_IF([! test -n "$VERSION"], [
+   AC_MSG_ERROR([git-version-gen failed])
+])
+
 if type -p stow > /dev/null && test -d /usr/local/stow ; then
    AC_MSG_NOTICE([*** Found /usr/local/stow: default install prefix set to /usr/local/stow/${PACKAGE_NAME}-${PACKAGE_VERSION} ***])
    ac_default_prefix="/usr/local/stow/${PACKAGE_NAME}-${PACKAGE_VERSION}"
@@ -20,7 +20,11 @@ AC_PROG_CC_C99
 AM_PROG_CC_C_O
 AC_PROG_GCC_TRADITIONAL
 
-AC_SUBST(PA_MAJORMINOR, PA_MAJOR.PA_MINOR)
+m4_define(pa_major, `echo $VERSION | cut -d. -f1 | cut -d- -f1`)
+m4_define(pa_minor, `echo $VERSION | cut -d. -f2 | cut -d- -f1`)
+
+AC_SUBST(PA_MAJOR, pa_major)
+AC_SUBST(PA_MAJORMINOR, pa_major.pa_minor)
 
 DESIRED_FLAGS="-Wall -W -Wextra -pedantic -pipe -Wno-long-long -Winline -Wvla -Wno-overlength-strings -Wunsafe-loop-optimizations -Wundef -Wformat=2 -Wlogical-op -Wsign-compare -Wpacked -Wformat-security -Wmissing-include-dirs -Wformat-nonliteral -Wold-style-definition -Wpointer-arith -Winit-self -Wfloat-equal -Wmissing-prototypes -Wstrict-prototypes -Wredundant-decls -Wmissing-declarations -Wmissing-noreturn -Wshadow -Wendif-labels -Wstrict-aliasing=2 -Wwrite-strings -Wno-unused-parameter -ffast-math -Wp,-D_FORTIFY_SOURCE=2 -fno-common -fdiagnostics-show-option" # PulseAudio 0.9.15 usess same + -Wcast-align -Wdeclaration-after-statement
 
@@ -164,7 +168,7 @@ AS_IF([test "$pulseaudio_cv__Bool" = "yes"], [
 #LT_INIT([dlopen win32-dll disable-static])
 AC_PROG_LIBTOOL
 
-PKG_CHECK_MODULES([PULSEAUDIO], [libpulse >= 2.1 pulsecore >= 2.1 ])
+PKG_CHECK_MODULES([PULSEAUDIO], [libpulse >= 5.0 pulsecore >= 5.0])
 AC_SUBST(PULSEAUDIO_CFLAGS)
 AC_SUBST(PULSEAUDIO_LIBS)
 

git-version-gen

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+if test $# -lt 1
+then
+    echo 1>&2 "Usage: $0 \$srcdir/.tarball-version"
+    exit 1
+fi
+
+VF=$1
+
+# First see if there is a version file,
+# then try git-describe, otherwise fail.
+if test -f $VF
+then
+    VN=$(cat $VF)
+elif test -d ${GIT_DIR:-.git} -o -f .git &&
+    V=$(git describe --match "[0-9]*" --abbrev=7 --tags 2>/dev/null)
+then
+    VN=$V
+else
+    echo 1>&2 "$0: Failed to determine revision"
+    exit 1
+fi
+
+# Omit the trailing newline, so that m4_esyscmd can use the result directly.
+echo "$VN" | tr -d '\012'

src/droid/Makefile.am

@@ -6,6 +6,7 @@ AM_CFLAGS = \
 	$(PULSEAUDIO_CFLAGS) \
 	$(DROIDHEADERS_CFLAGS) \
 	$(HYBRIS_CFLAGS) \
+	-DPULSEAUDIO_VERSION=@PA_MAJOR@ \
 	-I$(top_srcdir)/src/droid