gcc-4.7: Add knowledge about arm hf dynamic loader

(From OE-Core rev: a0d9e602a778feab2201a0643fb7d555b71017b9)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 49 insertions, 0 deletions

diff --git a/meta/recipes-devtools/gcc/gcc-4.7.inc b/meta/recipes-devtools/gcc/gcc-4.7.inc
index efd166c561..0321776ad1 100644
--- a/meta/recipes-devtools/gcc/gcc-4.7.inc
+++ b/meta/recipes-devtools/gcc/gcc-4.7.inc
@@ -65,6 +65,7 @@ SRC_URI = "svn://gcc.gnu.org/svn/gcc/branches;module=${BRANCH};proto=http \
            file://libgcc-sjlj-check.patch \
            file://cpp-honor-sysroot.patch \
            file://mips64-default-n64.patch \
+           file://arm-hard-float-loader.patch \
           "
 
 S = "${TMPDIR}/work-shared/gcc-${PV}-${PR}/${BRANCH}"
diff --git a/meta/recipes-devtools/gcc/gcc-4.7/arm-hard-float-loader.patch b/meta/recipes-devtools/gcc/gcc-4.7/arm-hard-float-loader.patch
new file mode 100644
index 0000000000..dfa0d191f3
--- /dev/null
+++ b/meta/recipes-devtools/gcc/gcc-4.7/arm-hard-float-loader.patch
@@ -0,0 +1,48 @@
+This patch is still being discussed by probably is almost
+final version. We add the OE notion of multilib on top
+
+Upstream-Status: Backport [ adapted ]
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+Index: gcc-4_7-branch/gcc/config/arm/linux-eabi.h
+===================================================================
+--- gcc-4_7-branch.orig/gcc/config/arm/linux-eabi.h     2012-04-30 15:28:31.891863845 -0700
++++ gcc-4_7-branch/gcc/config/arm/linux-eabi.h  2012-04-30 15:37:11.531888994 -0700
+@@ -32,7 +32,8 @@
+   while (false)
+ 
+ /* We default to a soft-float ABI so that binaries can run on all
+-   target hardware.  */
++   target hardware.  If you override this to use the hard-float ABI then
++   change the setting of GLIBC_DYNAMIC_LINKER_DEFAULT as well.  */
+ #undef  TARGET_DEFAULT_FLOAT_ABI
+ #define TARGET_DEFAULT_FLOAT_ABI ARM_FLOAT_ABI_SOFT
+ 
+@@ -59,10 +60,23 @@
+ #undef  SUBTARGET_EXTRA_LINK_SPEC
+ #define SUBTARGET_EXTRA_LINK_SPEC " -m " TARGET_LINKER_EMULATION
+ 
+-/* Use ld-linux.so.3 so that it will be possible to run "classic"
+-   GNU/Linux binaries on an EABI system.  */
++/* GNU/Linux on ARM currently supports three dynamic linkers:
++   - ld-linux.so.2 - for the legacy ABI
++   - ld-linux.so.3 - for the EABI-derived soft-float ABI
++   - ld-linux-armhf.so.3 - for the EABI-derived hard-float ABI.
++   All the dynamic linkers live in /lib.
++   We default to soft-float, but this can be overridden by changing both
++   GLIBC_DYNAMIC_LINKER_DEFAULT and TARGET_DEFAULT_FLOAT_ABI.  */
++
+ #undef  GLIBC_DYNAMIC_LINKER
+-#define GLIBC_DYNAMIC_LINKER SYSTEMLIBS_DIR "ld-linux.so.3"
++#define GLIBC_DYNAMIC_LINKER_SOFT_FLOAT SYSTEMLIBS_DIR "ld-linux.so.3"
++#define GLIBC_DYNAMIC_LINKER_HARD_FLOAT SYSTEMLIBS_DIR "ld-linux-armhf.so.3"
++#define GLIBC_DYNAMIC_LINKER_DEFAULT GLIBC_DYNAMIC_LINKER_SOFT_FLOAT
++
++ #define GLIBC_DYNAMIC_LINKER \
++    "%{mfloat-abi=hard:" GLIBC_DYNAMIC_LINKER_HARD_FLOAT "} \
++     %{mfloat-abi=soft*:" GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "} \
++     %{!mfloat-abi=*:" GLIBC_DYNAMIC_LINKER_DEFAULT "}"
+ 
+ /* At this point, bpabi.h will have clobbered LINK_SPEC.  We want to
+    use the GNU/Linux version, not the generic BPABI version.  */