lantiq: keep build paths out of the TAPI and VMMC modules

configure.in of drv_tapi and drv_vmmc compiles the whole configure command
line into the module. drv_tapi_linux.c prints it through a proc file. The
command line holds the absolute paths of the build machine, among them
--enable-kernelbuild, --with-ifxos-incl, --enable-tapiincl, CPPFLAGS and
LDFLAGS, so the module depends on the directory it was built in.

Measured in the published snapshot modules of lantiq/xway: drv_tapi.ko and
drv_vmmc.ko both hold
--enable-kernelbuild=/builder/shared-workdir/build/build_dir/...
The existing 020-not-leak-cflags.patch covers the Kbuild CFLAGS, not this
string.

Drop every argument that holds a path and keep the feature flags. The loop
repeats the idiom the file already uses for CONFIGURE_OPTIONS.

Signed-off-by: John Crispin <john@phrozen.org>

package/kernel/lantiq/ltq-tapi/Makefile

@@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=drv_tapi
 PKG_VERSION:=3.13.0
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_SOURCE:=drv_tapi-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=@OPENWRT

package/kernel/lantiq/ltq-tapi/patches/021-keep-build-paths-out-of-the-configure-string.patch

@@ -0,0 +1,46 @@
+From: John Crispin <john@phrozen.org>
+Subject: [PATCH] keep build paths out of the configure string
+
+configure.in compiles the whole configure command line into the module as
+DRV_TAPI_CONFIGURE_STR, and drv_tapi_linux.c prints it through a proc
+file. The command line holds the absolute paths of the build machine,
+among them --enable-kernelbuild, --with-ifxos-incl, CPPFLAGS and LDFLAGS.
+The module therefore depends on the directory it was built in, and two
+builds in different directories produce different modules.
+
+The published snapshot module of lantiq/xway holds, for example,
+--enable-kernelbuild=/builder/shared-workdir/build/build_dir/...
+
+Drop every argument that holds a path. The feature flags, which are the
+part a reader of the proc file wants, stay. The loop repeats the idiom
+that the file already uses for CONFIGURE_OPTIONS.
+
+Signed-off-by: John Crispin <john@phrozen.org>
+---
+ configure.in | 15 ++++++++++++++-
+ 1 file changed, 14 insertions(+), 1 deletion(-)
+
+--- a/configure.in
++++ b/configure.in
+@@ -86,7 +86,20 @@ AH_BOTTOM([
+ #endif /* _DRV_CONFIG_H_ */
+ ])
+
+-AC_DEFINE_UNQUOTED([DRV_TAPI_CONFIGURE_STR], ["$ac_configure_args"], [configure options string])
++# The string below is printed through a proc file. An absolute path of the
++# build machine has no meaning on the target, and it makes the module depend
++# on the directory it was built in. Keep the arguments that hold no path.
++CONFIGURE_STR=''
++for c_arg in $ac_configure_args; do
++   case $c_arg in
++      *"/"*)
++         ;;
++      *)
++         CONFIGURE_STR="$CONFIGURE_STR $c_arg"
++         ;;
++   esac
++done
++AC_DEFINE_UNQUOTED([DRV_TAPI_CONFIGURE_STR], ["$CONFIGURE_STR"], [configure options string])
+
+ dnl enable linux kernel 2.6.x support (Make sure AC_PROG_CC is defined before to set $CC!)
+ AM_CONDITIONAL(KERNEL_2_6, false)

package/kernel/lantiq/ltq-vmmc/Makefile

@@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=drv_vmmc
 PKG_VERSION:=1.9.0
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_HASH:=707f515eb727c032418c4da67d7e86884bb56cdc2a606e8f6ded6057d8767e57

package/kernel/lantiq/ltq-vmmc/patches/022-keep-build-paths-out-of-the-configure-string.patch

@@ -0,0 +1,46 @@
+From: John Crispin <john@phrozen.org>
+Subject: [PATCH] keep build paths out of the configure string
+
+configure.in compiles the whole configure command line into the module as
+VMMC_CONFIGURE_STR, and drv_vmmc_init.c keeps it in DRV_VMMC_WHICHCONFIG.
+The command line holds the absolute paths of the build machine, among them
+--enable-kernelbuild, --enable-tapiincl, CPPFLAGS and LDFLAGS. The module
+therefore depends on the directory it was built in, and two builds in
+different directories produce different modules.
+
+The published snapshot module of lantiq/xway holds, for example,
+--enable-kernelbuild=/builder/shared-workdir/build/build_dir/...
+
+Drop every argument that holds a path. The feature flags, which are the
+part a reader wants, stay. The loop repeats the idiom that the file
+already uses for CONFIGURE_OPTIONS.
+
+Signed-off-by: John Crispin <john@phrozen.org>
+---
+ configure.in | 15 ++++++++++++++-
+ 1 file changed, 14 insertions(+), 1 deletion(-)
+
+--- a/configure.in
++++ b/configure.in
+@@ -66,7 +66,20 @@ AH_BOTTOM([
+ #endif /* _DRV_CONFIG_H_ */
+ ])
+
+-AC_DEFINE_UNQUOTED([VMMC_CONFIGURE_STR], ["$ac_configure_args"], [configure options string])
++# The string below ends up in the module. An absolute path of the build
++# machine has no meaning on the target, and it makes the module depend on
++# the directory it was built in. Keep the arguments that hold no path.
++CONFIGURE_STR=''
++for c_arg in $ac_configure_args; do
++   case $c_arg in
++      *"/"*)
++         ;;
++      *)
++         CONFIGURE_STR="$CONFIGURE_STR $c_arg"
++         ;;
++   esac
++done
++AC_DEFINE_UNQUOTED([VMMC_CONFIGURE_STR], ["$CONFIGURE_STR"], [configure options string])
+
+ dnl enable linux kernel 2.6.x support (Make sure AC_PROG_CC is defined before to set $CC!)
+ AM_CONDITIONAL(KERNEL_2_6, false)