glibc: Enable static PIE support when security_flags are enabled

(From OE-Core rev: 8e4ece7bf0b09275a34ce8e7cc3e1e54a366c361)

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

meta/conf/distro/include/security_flags.inc

@@ -6,6 +6,7 @@
 # in the DISTRO="poky-lsb" configuration.
 
 GCCPIE ?= "--enable-default-pie"
+GLIBCPIE ?= "--enable-static-pie"
 
 # _FORTIFY_SOURCE requires -O1 or higher, so disable in debug builds as they use
 # -O0 which then results in a compiler warning.
@@ -30,6 +31,7 @@ SECURITY_X_LDFLAGS ?= "-fstack-protector-strong -Wl,-z,relro"
 SECURITY_CFLAGS_powerpc = "-fstack-protector-strong ${lcl_maybe_fortify} ${SECURITY_NOPIE_CFLAGS}"
 SECURITY_CFLAGS_pn-libgcc_powerpc = ""
 GCCPIE_powerpc = ""
+GLIBCPIE_powerpc = ""
 
 # arm specific security flag issues
 SECURITY_CFLAGS_pn-glibc = ""

meta/recipes-core/glibc/glibc_2.27.bb

@@ -69,6 +69,8 @@ GLIBC_BROKEN_LOCALES = ""
 #
 COMPATIBLE_HOST_libc-musl_class-target = "null"
 
+GLIBCPIE ??= ""
+
 EXTRA_OECONF = "--enable-kernel=${OLDEST_KERNEL} \
                 --without-cvs --disable-profile \
                 --disable-debug --without-gd \
@@ -82,6 +84,7 @@ EXTRA_OECONF = "--enable-kernel=${OLDEST_KERNEL} \
                 --enable-bind-now \
                 --enable-stack-protector=strong \
                 --enable-stackguard-randomization \
+                ${GLIBCPIE} \
                 ${GLIBC_EXTRA_OECONF}"
 
 EXTRA_OECONF += "${@get_libc_fpu_setting(bb, d)}"