[PATCH v2] poky-tiny: enable section removal

[PATCH v2] 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/poky-tiny.conf | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/meta-poky/conf/distro/poky-tiny.conf b/meta-poky/conf/distro/poky-tiny.conf
index c6d4b88f83d..19e48851519 100644
--- a/meta-poky/conf/distro/poky-tiny.conf
+++ b/meta-poky/conf/distro/poky-tiny.conf
@@ -122,3 +122,25 @@ PNBLACKLIST[core-image-weston] = "not buildable with poky-tiny"
 
 # Disable python usage in opkg-utils since it won't build with tiny config
 PACKAGECONFIG_remove_pn-opkg-utils = "python"
+
+# set default for all targets
+CFLAGS_append += "-ffunction-sections -fdata-sections"
+LDFLAGS_append += "-Wl,--gc-sections"
+
+# gc-sections requires either an entry or an undefined symbol
+CFLAGS_remove_pn-glibc += "-ffunction-sections -fdata-sections"
+LDFLAGS_remove_pn-glibc += "-Wl,--gc-sections"
+
+# perl won't cross compile with sections
+CFLAGS_remove_pn-perl += "-ffunction-sections -fdata-sections"
+LDFLAGS_remove_pn-perl += "-Wl,--gc-sections"
+
+# libdevmapper won't compile with sections
+# CFLAGS_remove_pn-libdevmapper += "-ffunction-sections -fdata-sections"
+# LDFLAGS_remove_pn-libdevmapper += "-Wl,--gc-sections"
+
+# Unknown float word ordering. You need to manually preset
+CFLAGS_remove_pn-cairo += "-ffunction-sections -fdata-sections"
+LDFLAGS_remove_pn-cairo += "-Wl,--gc-sections"
+
+
-- 
2.17.1

Re: [poky] [PATCH v2] poky-tiny: enable section removal

[Khem Raj]

On 11/9/20 2:25 PM, Sinan Kaya wrote:
> 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/poky-tiny.conf | 22 ++++++++++++++++++++++
>   1 file changed, 22 insertions(+)
> 
> diff --git a/meta-poky/conf/distro/poky-tiny.conf b/meta-poky/conf/distro/poky-tiny.conf
> index c6d4b88f83d..19e48851519 100644
> --- a/meta-poky/conf/distro/poky-tiny.conf
> +++ b/meta-poky/conf/distro/poky-tiny.conf
> @@ -122,3 +122,25 @@ PNBLACKLIST[core-image-weston] = "not buildable with poky-tiny"
>   
>   # Disable python usage in opkg-utils since it won't build with tiny config
>   PACKAGECONFIG_remove_pn-opkg-utils = "python"
> +
> +# set default for all targets
> +CFLAGS_append += "-ffunction-sections -fdata-sections"
> +LDFLAGS_append += "-Wl,--gc-sections"

lets not use += here with _append, and add a leading whitespace after 
first quote

> +
> +# gc-sections requires either an entry or an undefined symbol
> +CFLAGS_remove_pn-glibc += "-ffunction-sections -fdata-sections"
> +LDFLAGS_remove_pn-glibc += "-Wl,--gc-sections"

remove += here just = is enough with _remove

> +
> +# perl won't cross compile with sections
> +CFLAGS_remove_pn-perl += "-ffunction-sections -fdata-sections"
> +LDFLAGS_remove_pn-perl += "-Wl,--gc-sections"
> +

same above

> +# libdevmapper won't compile with sections
> +# CFLAGS_remove_pn-libdevmapper += "-ffunction-sections -fdata-sections"
> +# LDFLAGS_remove_pn-libdevmapper += "-Wl,--gc-sections"

same here

> +
> +# Unknown float word ordering. You need to manually preset
> +CFLAGS_remove_pn-cairo += "-ffunction-sections -fdata-sections"
> +LDFLAGS_remove_pn-cairo += "-Wl,--gc-sections"

same here

> +
> +
> 
> 
> 
> 
>