From 86c53b45c26e68b49b8cc7fc2ba26019f5e00f29 Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Wed, 13 Apr 2022 00:23:49 +0200
Subject: autoconf: Automatically derive version number from latest git tag

with a fallback to get the version string from a .tarball-version file
---
 configure.ac    | 51 ++++++++++++++++++++++++++++++++-------------------
 git-version-gen | 19 +++++++++++++++++++
 2 files changed, 51 insertions(+), 19 deletions(-)
 create mode 100755 git-version-gen

diff --git a/configure.ac b/configure.ac
index ed81dde..85cba48 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,17 +2,17 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ([2.68])
-AC_INIT([idevicerestore],[1.0.1],[https://github.com/libimobiledevice/idevicerestore/issues],[],[https://libimobiledevice.org])
-
-AC_CANONICAL_TARGET
+AC_INIT([idevicerestore], [m4_esyscmd(./git-version-gen $RELEASE_VERSION)], [https://github.com/libimobiledevice/idevicerestore/issues], [], [https://libimobiledevice.org])
 AM_INIT_AUTOMAKE([dist-bzip2 no-dist-gzip])
-
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES])
-
 AC_CONFIG_SRCDIR([src/])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
 
+# Check if we have a version defined
+if test -z $PACKAGE_VERSION; then
+  AC_MSG_ERROR([PACKAGE_VERSION is not defined. Make sure to configure a source tree checked out from git or that .tarball-version is present.])
+fi
 
 # Minimum package versions
 LIBIRECOVERY_VERSION=1.0.1
@@ -48,40 +48,53 @@ PKG_CHECK_MODULES(zlib, zlib)
 # optional
 PKG_CHECK_MODULES(openssl, openssl >= $OPENSSL_VERSION, have_openssl=yes, have_openssl=no)
 
-# Checking endianness
-AC_C_BIGENDIAN([AC_DEFINE([__BIG_ENDIAN__], [1], [big endian])],
-               [AC_DEFINE([__LITTLE_ENDIAN__], [1], [little endian])])
+AC_CHECK_FUNCS([strsep strcspn mkstemp realpath])
+if test x$ac_cv_func_strsep != xyes; then
+  if test x$ac_cv_func_strcspn != xyes; then
+    AC_MSG_ERROR([You need either strsep or strcspn to build $PACKAGE])
+  fi
+fi
+
+
+AC_CHECK_HEADER(endian.h, [ac_cv_have_endian_h="yes"], [ac_cv_have_endian_h="no"])
+if test "x$ac_cv_have_endian_h" = "xno"; then
+  AC_DEFINE(__LITTLE_ENDIAN,1234,[little endian])
+  AC_DEFINE(__BIG_ENDIAN,4321,[big endian])
+  AC_C_BIGENDIAN([ac_cv_c_bigendian="yes"], [ac_cv_c_bigendian="no"], [], [])
+  if test "x$ac_cv_c_bigendian" = "xyes"; then
+    AC_DEFINE(__BYTE_ORDER,4321,[big endian byte order])
+  else
+    AC_DEFINE(__BYTE_ORDER,1234,[little endian byte order])
+  fi
+fi
 
 GLOBAL_CFLAGS="-Wno-multichar -O2"
 AC_LDADD=""
 AC_LDFLAGS=""
-AC_MSG_CHECKING([whether we need platform-specific build settings])
+
+AC_CHECK_DECL([plist_from_json], [], [AC_MSG_ERROR([libplist with JSON format support required to build $PACKAGE_NAME])], [[#include <plist/plist.h>]])
+
+# Check for operating system
+AC_MSG_CHECKING([for platform-specific build settings])
 case ${host_os} in
   *mingw32*|*cygwin*)
-    AC_MSG_RESULT([yes])
+    AC_MSG_RESULT([${host_os}])
     win32=true
     GLOBAL_CFLAGS+=" -DWIN32 -D__LITTLE_ENDIAN__=1"
     AC_LDFLAGS+=" -static-libgcc"
     ;;
   darwin*)
-    AC_MSG_RESULT([yes])
+    AC_MSG_RESULT([${host_os}])
     AC_DEFINE([_DARWIN_BETTER_REALPATH], [1], [Use better method for realpath])
     AX_PTHREAD([], [AC_MSG_ERROR([pthread is required to build $PACKAGE])])
     ;;
   *)
-    AC_MSG_RESULT([yes])
+    AC_MSG_RESULT([${host_os}])
     AX_PTHREAD([], [AC_MSG_ERROR([pthread is required to build $PACKAGE])])
     ;;
 esac
 AM_CONDITIONAL(WIN32, test x$win32 = xtrue)
 
-AC_CHECK_FUNCS([strsep strcspn mkstemp realpath])
-if test x$ac_cv_func_strsep != xyes; then
-  if test x$ac_cv_func_strcspn != xyes; then
-    AC_MSG_ERROR([You need either strsep or strcspn to build $PACKAGE])
-  fi
-fi
-
 CACHED_CFLAGS="$CFLAGS"
 CFLAGS+=" $libimobiledevice_CFLAGS"
 
diff --git a/git-version-gen b/git-version-gen
new file mode 100755
index 0000000..3eb6a42
--- /dev/null
+++ b/git-version-gen
@@ -0,0 +1,19 @@
+#!/bin/sh
+SRCDIR=`dirname $0`
+if test -n "$1"; then
+  VER=$1
+else
+  if test -d "${SRCDIR}/.git" && test -x "`which git`" ; then
+    git update-index -q --refresh
+    if ! VER=`git describe --tags --dirty 2>/dev/null`; then
+      COMMIT=`git rev-parse --short HEAD`
+      DIRTY=`git diff --quiet HEAD || echo "-dirty"`
+      VER=`sed -n '1,/RE/s/Version \(.*\)/\1/p' ${SRCDIR}/NEWS`-git-${COMMIT}${DIRTY}
+    fi
+  else
+    if test -f "${SRCDIR}/.tarball-version"; then
+      VER=`cat "${SRCDIR}/.tarball-version"`
+    fi
+  fi
+fi
+printf %s "$VER"
-- 
cgit v1.1-32-gdbae