gcc/libc: Change bootstrap to use an intermediate sysroot and hence no longer overwrite files

Based upon patches from Dexuan Cui <dexuan.cui@intel.com>

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 22 insertions, 0 deletions

diff --git a/meta/recipes-core/eglibc/eglibc-initial.inc b/meta/recipes-core/eglibc/eglibc-initial.inc
index cb50e89226..ce85d99096 100644
--- a/meta/recipes-core/eglibc/eglibc-initial.inc
+++ b/meta/recipes-core/eglibc/eglibc-initial.inc
@@ -45,8 +45,15 @@ do_install () {
        install -m 644 csu/crt[1in].o ${D}${libdir}
        ${CC} -nostdlib -nostartfiles -shared -x c /dev/null \
                -o ${D}${libdir}/libc.so
+
+	# add links to linux-libc-headers: gcc-{cross,crossdk}-intermediate need this.
+	for t in linux asm asm-generic; do
+		ln -s ${STAGING_DIR_TARGET}${includedir}/$t ${D}${includedir}/
+	done
 }
 
 do_siteconfig () {
 	:
 }
+
+do_populate_sysroot[sstate-outputdirs] = "${STAGING_DIR_TCBOOTSTRAP}"
diff --git a/meta/recipes-core/eglibc/eglibc.inc b/meta/recipes-core/eglibc/eglibc.inc
index 63c313ca48..8314cb1548 100644
--- a/meta/recipes-core/eglibc/eglibc.inc
+++ b/meta/recipes-core/eglibc/eglibc.inc
@@ -4,6 +4,21 @@ STAGINGCC = "gcc-cross-intermediate"
 STAGINGCC_virtclass-nativesdk = "gcc-crosssdk-intermediate"
 PATH_prepend = "${STAGING_BINDIR_TOOLCHAIN}.${STAGINGCC}:"
 
+TOOLCHAIN_OPTIONS = " --sysroot=${STAGING_DIR_TCBOOTSTRAP}"
+
+# siteconfig.bbclass runs configure which needs a working compiler
+# For the compiler to work we need a working libc yet libc isn't 
+# in the sysroots directory at this point. This means the libc.so
+# linker script won't work as the --sysroot setting isn't correct.
+# Here we create a hacked up libc linker script and pass in the right
+# flags to let configure work. Ugly.
+EXTRASITECONFIG = "CFLAGS='${CFLAGS} -Wl,-L${WORKDIR}/site_config_libc -L${WORKDIR}/site_config_libc -L${SYSROOT_DESTDIR}${libdir} -L${SYSROOT_DESTDIR}${base_libdir} -Wl,-L${SYSROOT_DESTDIR}${libdir} -Wl,-L${SYSROOT_DESTDIR}${base_libdir}'"
+siteconfig_do_siteconfig_gencache_prepend = " \
+	mkdir -p ${WORKDIR}/site_config_libc; \
+	cp ${SYSROOT_DESTDIR}${libdir}/libc.so ${WORKDIR}/site_config_libc; \
+	sed -i -e 's# ${base_libdir}# ${SYSROOT_DESTDIR}${base_libdir}#g' -e 's# ${libdir}# ${SYSROOT_DESTDIR}${libdir}#g' ${WORKDIR}/site_config_libc/libc.so; \
+"
+
 # nptl needs unwind support in gcc, which can't be built without glibc.
 DEPENDS = "virtual/${TARGET_PREFIX}gcc-intermediate linux-libc-headers"
 #this leads to circular deps, so lets not add it yet