klibc: Pass Optimization with KLIBCOPTFLAGS

Overriding KLIBCOPTFLAGS also meant that -Ox flags
were taken off. Which results in errors like

| usr/dash/shell.h: In function 'max_int_length':
| usr/dash/shell.h:103:25: error: '-mgeneral-regs-only' is incompatible with floating-point code
|   return (bytes * 8 - 1) * 0.30102999566398119521 + 14;
|          ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
| usr/dash/shell.h:103:25: error: '-mgeneral-regs-only' is incompatible with floating-point argument

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-initramfs/recipes-devtools/klibc/klibc-2.0.4/0001-arm-Do-not-set-a-fallback-march-and-mtune.patch

@@ -0,0 +1,33 @@
+From a46a144ac883898d9cedf7a0b13aec6d10116125 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Fri, 29 Sep 2017 23:11:53 -0700
+Subject: [PATCH] arm: Do not set a fallback march and mtune
+
+In OE we pass the options explicitly, there is
+no need to set it inside the makefiles, we will
+need to compute values for CPU_ARCH and CPU_TUNE
+which is a bit harder in OE
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+
+ usr/klibc/arch/arm/MCONFIG | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/usr/klibc/arch/arm/MCONFIG b/usr/klibc/arch/arm/MCONFIG
+index 53bc1dc3..857e2f2d 100644
+--- a/usr/klibc/arch/arm/MCONFIG
++++ b/usr/klibc/arch/arm/MCONFIG
+@@ -10,7 +10,7 @@
+ CPU_ARCH ?= armv4
+ CPU_TUNE ?= strongarm
+ 
+-KLIBCOPTFLAGS += -Os -march=$(CPU_ARCH) -mtune=$(CPU_TUNE)
++KLIBCOPTFLAGS += -Os
+ KLIBCBITSIZE  = 32
+ KLIBCREQFLAGS += -fno-exceptions
+ KLIBCSTRIPFLAGS += -R .ARM.exidx
+-- 
+2.14.2
+

meta-initramfs/recipes-devtools/klibc/klibc.inc

@@ -19,6 +19,7 @@ SRC_URI = "git://git.kernel.org/pub/scm/libs/klibc/klibc.git \
            file://0001-always-use-bfd-linker.patch \
            file://0001-Kbuild.klibc-Use-print-libgcc-file-name-instead-of-p.patch \
            file://0001-Kbuild.klibc-Add-path-to-compiler-headers-via-isyste.patch \
+           file://0001-arm-Do-not-set-a-fallback-march-and-mtune.patch \
 "
 
 ARMPATCHES ?= ""
@@ -40,7 +41,8 @@ EXTRA_OEMAKE = "'KLIBCARCH=${KLIBC_ARCH}' \
                 'INSTALLDIR=${libdir}/klibc' \
                 'SHLIBDIR=${libdir}' \
                 '${KLIBCTHUMB}' \
-                'KLIBCOPTFLAGS=${TUNE_CCARGS}' \
+                'KLIBCOPTFLAGS=${TUNE_CCARGS} -Os' \
+                 V=1 \
                 "
 
 export FIX_ARMV4_EABI_BX = "${FIX_V4BX}"