[PATCH 2/2] powerpc new toolchains fix (crt.S)

[Maxim Uvarov <muvarov@gmail.com>]

This patch is required in case if you are using new toolchains.

Best regards,
Maxim Uvarov.

From: Maxim Uvarov <muvarov@gmail.com>

Linker does not provide some vital functions when building freestanding
applications with a new toolchain, so we have to provide our own CRT.

p.s.
Without the CRT we won't see any build errors (since the purgatory is
linked with --no-undefined), but the purgatory code won't work,
'kexec -e' will just hang the board.


I added option to configure to keep code buildable for old toolchais.
But there should be way to do this automatically.

Author: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Maxim Uvarov <muvarov@gmail.com>
---

 configure.ac                |    9 +++++++++
 purgatory/arch/ppc/Makefile |    3 +++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index fcf50e4..63606bc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -159,6 +159,15 @@ if test "$with_xen" = yes ; then
 		AC_MSG_NOTICE([Xen support disabled])))
 fi
 
+dnl new toolchains
+if test "$ARCH" = ppc; then
+AC_ARG_WITH([oldtoolchain],
+		AC_HELP_STRING([--with-oldtoolchain],[compile without crt.S
+			required for new toolchains]),
+		AC_DEFINE(PPC_OLDTOOLCHAIN, 1,
+			[Define to compile with old toolchains]))
+fi
+
 dnl ---Sanity checks
 if test "$CC"      = "no"; then AC_MSG_ERROR([cc not found]); fi
 if test "$CPP"     = "no"; then AC_MSG_ERROR([cpp not found]); fi
diff --git a/purgatory/arch/ppc/Makefile b/purgatory/arch/ppc/Makefile
index 72289a0..d11ec3e 100644
--- a/purgatory/arch/ppc/Makefile
+++ b/purgatory/arch/ppc/Makefile
@@ -6,6 +6,9 @@ ppc_PURGATORY_SRCS += purgatory/arch/ppc/v2wrap_32.S
 ppc_PURGATORY_SRCS += purgatory/arch/ppc/misc.S
 ppc_PURGATORY_SRCS += purgatory/arch/ppc/purgatory-ppc.c
 ppc_PURGATORY_SRCS += purgatory/arch/ppc/console-ppc.c
+ifndef PPC_OLDTOOLCHAIN
+	ppc_PURGATORY_SRCS += purgatory/arch/ppc/crt.S
+endif
 
 dist += purgatory/arch/ppc/Makefile $(ppc_PURGATORY_SRCS)		\
 	purgatory/arch/ppc/purgatory-ppc.h purgatory/arch/ppc/ppc_asm.h