valgrind: fix link failure with gold

(From OE-Core rev: 4c38908169a11635138d357fa4be39a80d6285e8)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/valgrind/valgrind/link-gz-tests.patch

@@ -0,0 +1,27 @@
+When checking if the compiler supports compressed debug sections we need to
+actually link instead of just compile.  Otherwise the compiler thinks that
+they are supported, but gold does not support -gz=zlib.
+
+Upstream-Status: Backport (r16459)
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+--- a/configure.ac~	2017-07-11 11:53:16.000000000 +0100
++++ b/configure.ac	2017-07-11 18:16:13.674130483 +0100
+@@ -2119,7 +2119,7 @@
+ safe_CFLAGS=$CFLAGS
+ CFLAGS="-g -gz=zlib"
+ 
+-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[
++AC_LINK_IFELSE([AC_LANG_PROGRAM([[ ]], [[
+   return 0;
+ ]])], [
+ ac_have_gz_zlib=yes
+@@ -2139,7 +2139,7 @@
+ safe_CFLAGS=$CFLAGS
+ CFLAGS="-g -gz=zlib-gnu"
+ 
+-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]], [[
++AC_LINK_IFELSE([AC_LANG_PROGRAM([[ ]], [[
+   return 0;
+ ]])], [
+ ac_have_gz_zlib_gnu=yes

meta/recipes-devtools/valgrind/valgrind_3.12.0.bb

@@ -35,6 +35,7 @@ SRC_URI = "http://www.valgrind.org/downloads/valgrind-${PV}.tar.bz2 \
            file://0001-memcheck-arm64-Define-__THROW-if-not-already-defined.patch \
            file://0002-memcheck-x86-Define-__THROW-if-not-defined.patch \
            file://0003-tests-seg_override-Replace-__modify_ldt-with-syscall.patch \
+           file://link-gz-tests.patch \
            "
 SRC_URI_append_libc-musl = "\
            file://0001-fix-build-for-musl-targets.patch \