Package: picolibc-aarch64-linux-gnu Version: 1.7.2-2 User: ubuntu-de...@lists.ubuntu.com Usertags: origin-ubuntu impish
Hi Keith, Recent versions of picolibc are failing to migrate into the Ubuntu release because the new(ish) aarch64 autopkgtest fails on Ubuntu: [...] autopkgtest [19:05:54]: test command3: [----------------------- /usr/lib/gcc-cross/aarch64-linux-gnu/11/../../../../aarch64-linux-gnu/bin/ld: /usr/lib/picolibc/aarch64-linux-gnu/lib/../lib/libc.a(stack_protector.c.o): in function `__stack_chk_fail_weak': ./aarch64-linux-gnu/../../../newlib/libc/ssp/stack_protector.c:54: undefined reference to `_exit' /usr/lib/gcc-cross/aarch64-linux-gnu/11/../../../../aarch64-linux-gnu/bin/ld: /usr/lib/picolibc/aarch64-linux-gnu/lib/../lib/libc.a(puts.c.o): in function `puts': ./aarch64-linux-gnu/../../../newlib/libc/tinystdio/puts.c:41: undefined reference to `__iob' /usr/lib/gcc-cross/aarch64-linux-gnu/11/../../../../aarch64-linux-gnu/bin/ld: ./aarch64-linux-gnu/../../../newlib/libc/tinystdio/puts.c:41: undefined reference to `__iob' /usr/lib/gcc-cross/aarch64-linux-gnu/11/../../../../aarch64-linux-gnu/bin/ld: /usr/lib/picolibc/aarch64-linux-gnu/lib/../lib/libc.a(signal.c.o): in function `raise': ./aarch64-linux-gnu/../../../newlib/libc/signal/signal.c:131: undefined reference to `getpid' /usr/lib/gcc-cross/aarch64-linux-gnu/11/../../../../aarch64-linux-gnu/bin/ld: ./aarch64-linux-gnu/../../../newlib/libc/signal/signal.c:131: undefined reference to `kill' collect2: error: ld returned 1 exit status [...] (https://autopkgtest.ubuntu.com/packages/p/picolibc/impish/amd64) I believe the issue is that, unlike other architectures, the aarch64 support is using gcc-aarch64-linux-gnu instead of a compiler that uses a libc-less target by default, and makes an incorrect assumption that in its default configuration it will not generate references to glibc. This happens to work for the autopkgtest test case on Debian, but fails on Ubuntu (from the output, probably related at least in part to the additional security hardening features that are turned on in Ubuntu gcc by default). The following compile command succeeds: aarch64-linux-gnu-gcc -ffreestanding --specs=picolibc.specs -o /tmp/touch-aarch64 debian/tests/touch.c -lm So perhaps picolibc.specs just needs to include the equivalent of -ffreestanding in order to be portable. Cheers, -- Steve Langasek Give me a lever long enough and a Free OS Debian Developer to set it on, and I can move the world. Ubuntu Developer https://www.debian.org/ slanga...@ubuntu.com vor...@debian.org
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