package/uclibc: disable LTO unconditionally

Recent commit b7a00b39bca0 (package/glibc: force -fno-lto) only catered
for glibc, but all C libraries, like uClibc-NG, are impacted, for very
similar reasons.

Disable LTO unconditionally for uClibc-NG too.

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Norbert Lange <nolange79@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/uclibc/uclibc.mk

@@ -362,10 +362,18 @@ endif
 # Commands
 #
 
+UCLIBC_EXTRA_CFLAGS = $(TARGET_ABI)
+
+# uClibc-ng does not build with LTO, so explicitly disable it
+# when using a compiler that may have support for LTO
+ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_4_7),y)
+UCLIBC_EXTRA_CFLAGS += -fno-lto
+endif
+
 UCLIBC_MAKE_FLAGS = \
 	ARCH="$(UCLIBC_TARGET_ARCH)" \
 	CROSS_COMPILE="$(TARGET_CROSS)" \
-	UCLIBC_EXTRA_CFLAGS="$(TARGET_ABI)" \
+	UCLIBC_EXTRA_CFLAGS="$(UCLIBC_EXTRA_CFLAGS)" \
 	HOSTCC="$(HOSTCC)"
 
 define UCLIBC_KCONFIG_FIXUP_CMDS