toolchain: update gcc snapshot version

* Make mpc mandatory since we are probably building bleeding-edge
* Change snapshot naming convention to match the source

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/gcc/Config.in

@@ -45,11 +45,17 @@ config BR2_GCC_SUPPORTS_FINEGRAINEDMTUNE
 
 config BR2_GCC_SNAP_DATE
 	string "GCC snapshot date"
-	default "20070921"
+	default "4.7-20110430"
 	depends on BR2_GCC_VERSION_SNAP
 	help
-	  Enter snapshot date to use for gcc.  Format is:
-	  YYYYMMDD
+	  Enter snapshot date to use for gcc.
+	  Format is: A.B-YYYYMMDD
+
+	  A is GCC major version, for example 4.
+	  B is GCC minor version, for example 7.
+	  YYYYMMDD is snapshot date, for example 20110430.
+
+	  This way we'd get version 4.7-20110430
 
 config BR2_GCC_VERSION
 	string

toolchain/gcc/Config.in.2

@@ -3,7 +3,7 @@ config BR2_PACKAGE_GCC_TARGET
 	depends on BR2_HAVE_DEVFILES && BR2_TOOLCHAIN_BUILDROOT
 	select BR2_PACKAGE_BINUTILS
 	select BR2_PACKAGE_BINUTILS_TARGET
-	select BR2_PACKAGE_MPC if (BR2_GCC_VERSION_4_5_X || BR2_GCC_VERSION_4_6_X)
+	select BR2_PACKAGE_MPC if (BR2_GCC_VERSION_4_5_X || BR2_GCC_VERSION_4_6_X || BR2_GCC_VERSION_SNAP)
 	select BR2_PACKAGE_MPFR
 	select BR2_PACKAGE_GMP
 	help

toolchain/gcc/gcc-uclibc-4.x.mk

@@ -141,6 +141,17 @@ endif
 GCC_HOST_PREREQ += host-mpc
 endif
 
+# GCC snapshot prerequisites
+# Since we don't know and it can be quite new just ask for everything known
+ifneq ($(GCC_SNAP_DATE),)
+GCC_WITH_HOST_MPC = --with-mpc=$(HOST_DIR)/usr
+GCC_TARGET_PREREQ += mpc
+ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
+HOST_SOURCE += host-mpc-source
+endif
+GCC_HOST_PREREQ += host-mpc
+endif
+
 ifeq ($(BR2_GCC_SHARED_LIBGCC),y)
 GCC_SHARED_LIBGCC:=--enable-shared
 else