Package: libnewlib-arm-none-eabi
Version: 3.3.0-1
Severity: normal
Dear Maintainer,
newlib is supposed to be built with `-f{data,function}-sections`, and
newlib-nano is supposed to be built with also `-Os -fshort-wchar`:
=== cut debian/rules ===
CFLAGS := CFLAGS="-g -O2 -ffunction-sections -fdata-sections"
CFLAGS_NANO := CFLAGS="-g -Os -ffunction-sections -fdata-sections -fshort-wchar"
=== cut ===
Unfortunately, this is cross-compilation, and those flags are used to compile
only
*build host* objects, and not for *target* objects. So, all target libraries
are built
with wrong cflags.
This is especially bad for newlib-nano, as `-fshort-wchar` is alters ABI
(and lack of `-f*-sections` prevents removing unused data/functions on link
time, which is important for ram/flash limited targets).
(actually, I'm not sure if `-fshort-wchar` was that much good idea: you either
don't
use `wchar_t` at all, or you want "proper" 32-bit one; and given that
`-fshort-wchar`
is not automatically passed by `-specs=nano.specs`, this requires non-trivial
and flaky
auto-configuration from library users, e.g.
https://github.com/RIOT-OS/RIOT/pull/5627 ).
Fix:
CFLAGS += CFLAGS_FOR_TARGET="-g -O2 -ffunction-sections -fdata-sections"
CFLAGS_NANO += CFLAGS_FOR_TARGET="-g -Os -ffunction-sections -fdata-sections
-fshort-wchar"
Disclaimer: noticed while building local backport; verified with buildd's logs
https://buildd.debian.org/status/fetch.php?pkg=newlib&arch=all&ver=3.3.0-1&stamp=1583408649&raw=1
and inspecting lib*.a from "official" packages from sid/bullseye, buster,
stretch
(confirmed all was built without -f{funciton,data}-section). Bugreport metadata
altered to match sid version.
-- System Information:
Debian Release: 9.13
APT prefers oldstable-updates
APT policy: (500, 'oldstable-updates'), (500, 'oldstable-debug'), (500,
'oldstable')
Architecture: i386 (x86_64)
Foreign Architectures: amd64
Kernel: Linux 4.9.0-14-amd64 (SMP w/2 CPU cores)
Locale: LANG=ru_RU.KOI8-R, LC_CTYPE=ru_RU.KOI8-R (charmap=KOI8-R),
LANGUAGE=ru_RU.KOI8-R (charmap=KOI8-R)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages libnewlib-arm-none-eabi depends on:
ii libnewlib-dev 3.3.0-1
Versions of packages libnewlib-arm-none-eabi recommends:
ii gcc-arm-none-eabi 15:8-2019-q3-1
ii libstdc++-arm-none-eabi-ne 15:8-2019-q3-1
Versions of packages libnewlib-arm-none-eabi suggests:
pn libnewlib-doc <none>
-- no debconf information
