[PATCH v7] poky-tiny: enable section removal

[PATCH v7] poky-tiny: enable section removal

[Sinan Kaya]

Use GCC sections flags so that unused sections can be garbage
collected at link time.

Signed-off-by: Sinan Kaya <okaya@kernel.org>
---
 meta-poky/conf/distro/include/gcsections.inc | 22 ++++++++++++++++++++
 meta-poky/conf/distro/poky-tiny.conf         |  2 ++
 2 files changed, 24 insertions(+)
 create mode 100644 meta-poky/conf/distro/include/gcsections.inc

diff --git a/meta-poky/conf/distro/include/gcsections.inc b/meta-poky/conf/distro/include/gcsections.inc
new file mode 100644
index 00000000000..dd98943acb3
--- /dev/null
+++ b/meta-poky/conf/distro/include/gcsections.inc
@@ -0,0 +1,22 @@
+CFLAGS_SECTION_REMOVAL = "-ffunction-sections -fdata-sections"
+LDFLAGS_SECTION_REMOVAL = "-Wl,--gc-sections"
+
+# packages with build problems using sections
+CFLAGS_SECTION_REMOVAL_pn-glibc = ""
+LDFLAGS_SECTION_REMOVAL_pn-glibc = ""
+CFLAGS_SECTION_REMOVAL_pn-cairo = ""
+LDFLAGS_SECTION_REMOVAL_pn-cairo = ""
+CFLAGS_SECTION_REMOVAL_pn-perl = ""
+LDFLAGS_SECTION_REMOVAL_pn-perl = ""
+CFLAGS_SECTION_REMOVAL_pn-grub-efi = ""
+LDFLAGS_SECTION_REMOVAL_pn-grub-efi = ""
+CFLAGS_SECTION_REMOVAL_pn-grub = ""
+LDFLAGS_SECTION_REMOVAL_pn-grub = ""
+
+# set default for target
+CFLAGS_append_class-target = " ${CFLAGS_SECTION_REMOVAL}"
+LDFLAGS_append_class-target = " ${LDFLAGS_SECTION_REMOVAL}"
+
+# set default for nativesdk
+CFLAGS_append_class-nativesdk = " ${CFLAGS_SECTION_REMOVAL}"
+LDFLAGS_append_class-nativesdk = " ${LDFLAGS_SECTION_REMOVAL}"
diff --git a/meta-poky/conf/distro/poky-tiny.conf b/meta-poky/conf/distro/poky-tiny.conf
index c6d4b88f83d..fcee513f14a 100644
--- a/meta-poky/conf/distro/poky-tiny.conf
+++ b/meta-poky/conf/distro/poky-tiny.conf
@@ -29,6 +29,8 @@
 # [ ] Modify busybox to allow for DISTRO_FEATURES-like confiruration
 
 require conf/distro/poky.conf
+require conf/distro/include/gcsections.inc
+
 DISTRO = "poky-tiny"
 DISTROOVERRIDES = "poky:poky-tiny"
 TCLIBC = "musl"
-- 
2.17.1