tools: bring back genext2fs for apm821xx

This reverts commit 8c68c10.
It is used for apm821xx, which needs ext2 (not ext4) images for some
devices.

Signed-off-by: Felix Fietkau <[email protected]>

target/linux/apm821xx/sata/target.mk

@@ -7,7 +7,3 @@ define Target/Description
 	Build firmware images for APM82181 boards that boot from SATA.
 	For NAS like the MyBook Live Series.
 endef
-
-$(eval $(call $(if $(CONFIG_TARGET_ROOTFS_EXT4FS),RequireCommand,Ignore),genext2fs, \
-        Please install genext2fs. \
-))

tools/Makefile

@@ -44,6 +44,7 @@ tools-$(BUILD_B43_TOOLS) += b43-tools
 tools-$(BUILD_PPL_CLOOG) += ppl cloog
 tools-$(BUILD_ISL) += isl
 tools-$(CONFIG_USE_SPARSE) += sparse
+tools-$(CONFIG_TARGET_apm821xx) += genext2fs
 
 # builddir dependencies
 $(curdir)/bison/compile := $(curdir)/flex/install

tools/genext2fs/Makefile

@@ -0,0 +1,51 @@
+# 
+# Copyright (C) 2006 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=genext2fs
+PKG_VERSION:=1.4.1
+
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
+PKG_SOURCE_URL:=@SF/genext2fs
+PKG_MD5SUM:=b7b6361bcce2cedff1ae437fadafe53b
+
+include $(INCLUDE_DIR)/host-build.mk
+
+HOST_CONFIGURE_ARGS = \
+	--target=$(GNU_HOST_NAME) \
+	--host=$(GNU_HOST_NAME) \
+	--build=$(GNU_HOST_NAME) \
+	--program-prefix="" \
+	--program-suffix="" \
+	--prefix=/usr \
+	--exec-prefix=/usr \
+	--bindir=/usr/bin \
+	--sbindir=/usr/sbin \
+	--libexecdir=/usr/lib \
+	--sysconfdir=/etc \
+	--datadir=/usr/share \
+	--localstatedir=/var \
+	--mandir=/usr/man \
+	--infodir=/usr/info \
+
+define Host/Compile
+	$(MAKE) -C $(HOST_BUILD_DIR) \
+		CFLAGS="$(HOST_CFLAGS)" \
+		LDFLAGS="$(HOST_LDFLAGS)" \
+		all
+endef
+
+define Host/Install
+	install -m0755 $(HOST_BUILD_DIR)/genext2fs $(STAGING_DIR_HOST)/bin/
+endef
+
+define Host/Clean
+	rm -f $(STAGING_DIR_HOST)/bin/genext2fs
+endef
+
+$(eval $(call HostBuild))

tools/genext2fs/patches/100-c99_scanf.patch

@@ -0,0 +1,21 @@
+commit 3b8ca0ce9a0b58287a780747c90c449bdebfe464
+Author: Xavier Bestel <[email protected]>
+Date:   Mon Jan 14 08:52:44 2008 +0000
+
+    removed use of %as is scanf (GNU conflicts with C99) by Giacomo Catenazzi <[email protected]>
+
+diff --git a/genext2fs.c b/genext2fs.c
+index 070b270..f0d797d 100644
+--- a/genext2fs.c
++++ b/genext2fs.c
+@@ -286,7 +286,9 @@ typedef unsigned int uint32;
+ // older solaris. Note that this is still not very portable, in that
+ // the return value cannot be trusted.
+
+-#if SCANF_CAN_MALLOC
++#if 0 // SCANF_CAN_MALLOC
++// C99 define "a" for floating point, so you can have runtime surprise
++// according the library versions
+ # define SCANF_PREFIX "a"
+ # define SCANF_STRING(s) (&s)
+ #else

tools/genext2fs/patches/200-autoconf.patch

@@ -0,0 +1,13 @@
+Index: genext2fs/m4/ac_func_scanf_can_malloc.m4
+===================================================================
+--- genext2fs.orig/m4/ac_func_scanf_can_malloc.m4	2011-09-03 21:28:49.000000000 +0200
++++ genext2fs/m4/ac_func_scanf_can_malloc.m4	2011-09-03 21:29:41.000000000 +0200
+@@ -9,7 +9,7 @@
+ # --------------------------------------
+ AC_DEFUN([AC_FUNC_SCANF_CAN_MALLOC],
+   [ AC_CHECK_HEADERS([stdlib.h])
+-    AC_CACHE_CHECK([whether scanf can malloc], [ac_scanf_can_malloc],
++    AC_CACHE_CHECK([whether scanf can malloc], [ac_cv_func_scanf_can_malloc],
+     [ AC_RUN_IFELSE(
+       [ AC_LANG_PROGRAM(
+         [