libstdcpp dependency of shared-state-async takes 2 MB

[ilario]

Installing LibreMesh packages using OPKG, I observed this message:

Collected errors:
 * verify_pkg_installable: Only have 480kb available on filesystem /overlay, pkg libstdcpp6 needs 2070
 * opkg_install_cmd: Cannot install package shared-state-bat_hosts.

Unpacking the compiled libstdcpp6, I can confirm that its /usr/lib/libstdc++.so.6.0.32 file is 2.1 MB, which makes it a problem for installation on routers with 8 MB of flash memory.

This dependency is defined here:

lime-packages/packages/shared-state-async/Makefile

Lines 45 to 48 in de9ff02

	# TODO: Statically linking libstdcpp instead of depending on it and then
	# stripping unused symbols might reduce space usage, until this is the
	# only package to use it
	DEPENDS:=+libstdcpp

Is this dependency unavoidable?

[ilario]

Already comparing the compressed size of the packages, it is clear that libstdcpp6 is the main problem for routers with not-huge flash. The list below is taken from a typical LibreMesh installation.

du size	package file
656	targets/ramips/mt76x8/packages/libstdcpp6_13.3.0-r4_mipsel_24kc.ipk
84	packages/mipsel_24kc/libremesh/shared-state-async_2025.06.08~1749408087_mipsel_24kc.ipk
80	targets/ramips/mt76x8/packages/kmod-batman-adv_6.6.86.2024.3-r5_mipsel_24kc.ipk
64	packages/mipsel_24kc/base/liblua5.1.5_5.1.5-r11_mipsel_24kc.ipk
56	packages/mipsel_24kc/routing/babeld_1.13.1-r2_mipsel_24kc.ipk
40	packages/mipsel_24kc/routing/batctl-default_2024.3-r1_mipsel_24kc.ipk
28	packages/mipsel_24kc/libremesh/lime-system_2025.06.08~1749408087_all.ipk
28	packages/mipsel_24kc/luci/luci-lib-nixio_25.119.71430~be769af_mipsel_24kc.ipk
28	packages/mipsel_24kc/packages/iputils-ping_20240905-r1_mipsel_24kc.ipk
12	packages/mipsel_24kc/luci/luci-lib-ip_25.119.71430~be769af_mipsel_24kc.ipk
12	targets/ramips/mt76x8/packages/kmod-macvlan_6.6.86-r1_mipsel_24kc.ipk
8	packages/mipsel_24kc/base/libiwinfo-lua_2024.10.20~b94f066e-r1_mipsel_24kc.ipk
8	packages/mipsel_24kc/base/libubox-lua_2024.03.29~eb9bcb64-r1_mipsel_24kc.ipk
8	packages/mipsel_24kc/base/libubus-lua_2025.01.02~afa57cce-r1_mipsel_24kc.ipk
8	packages/mipsel_24kc/base/libuci-lua_2025.01.20~16ff0bad-r1_mipsel_24kc.ipk
8	packages/mipsel_24kc/base/lua_5.1.5-r11_mipsel_24kc.ipk
8	packages/mipsel_24kc/libremesh/shared-state_25.161.71284~e2bca6c_all.ipk
8	packages/mipsel_24kc/luci/luci-lib-jsonc_25.119.71430~be769af_mipsel_24kc.ipk
8	targets/ramips/mt76x8/packages/kmod-nft-bridge_6.6.86-r1_mipsel_24kc.ipk
4	packages/mipsel_24kc/libremesh/babeld-auto-gw-mode_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/hotplug-initd-services_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/lime-hwd-openwrt-wan_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/lime-proto-anygw_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/lime-proto-babeld_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/lime-proto-batadv_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/lime-proto-wan_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/lime-report_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/shared-state-babeld_hosts_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/shared-state-bat_hosts_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/shared-state-dnsmasq_hosts_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/shared-state-dnsmasq_leases_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/shared-state-nodes_and_links_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/ubus-lime-location_25.161.71284~e2bca6c_all.ipk
4	packages/mipsel_24kc/libremesh/watchping_25.161.71284~e2bca6c_all.ipk
4	targets/ramips/mt76x8/packages/kmod-crypto-md5_6.6.86-r1_mipsel_24kc.ipk
4	targets/ramips/mt76x8/packages/kmod-lib-crc16_6.6.86-r1_mipsel_24kc.ipk
4	targets/ramips/mt76x8/packages/librt_1.2.5-r4_mipsel_24kc.ipk