Bug#1126482: libc6: Conflicting sections .note.GNU-stack in x86_64-linux-gnu/crt1.o

Package: libc6
Version: 2.42-10+b1
Severity: important

Dear Maintainer,

with the latest version 2.42-10+b1 of libc6* package on Debian/testing amd64,
there is an issue to compile some C code with tcc compiler using
/usr/lib/x86_64-linux-gnu/crt1.o file.

In this file, there is 2 conflicting sections for ".note.GNU-stack": one with
NOTE(7) type and one with PROGBITS(10) type.

$ readelf -S /usr/lib/x86_64-linux-gnu/crt1.o
There are 15 section headers, starting at offset 0x370:

Section Headers:
  [Nr] Name              Type             Address           Offset
       Size              EntSize          Flags  Link  Info  Align
  [ 0]                   NULL             0000000000000000  00000000
       0000000000000000  0000000000000000           0     0     0
  [ 1] .text             PROGBITS         0000000000000000  00000040
       0000000000000031  0000000000000000  AX       0     0     16
  [ 2] .rela.text        RELA             0000000000000000  00000290
       0000000000000030  0000000000000018   I      12     1     8
  [ 3] .eh_frame         PROGBITS         0000000000000000  00000078
       000000000000005c  0000000000000000   A       0     0     8
  [ 4] .rela.eh_frame    RELA             0000000000000000  000002c0
       0000000000000030  0000000000000018   I      12     3     8
  [ 5] .data             PROGBITS         0000000000000000  000000d4
       0000000000000004  0000000000000000  WA       0     0     1
  [ 6] .bss              NOBITS           0000000000000000  000000d8
       0000000000000000  0000000000000000  WA       0     0     1
  [ 7] .note.GNU-stack   NOTE             0000000000000000  000000d8
       0000000000000000  0000000000000000           0     0     1
  [ 8] .note.gnu.pr[...] NOTE             0000000000000000  000000d8
       0000000000000020  0000000000000000   A       0     0     8
  [ 9] .note.ABI-tag     NOTE             0000000000000000  000000f8
       0000000000000020  0000000000000000   A       0     0     4
  [10] .note.GNU-stack   PROGBITS         0000000000000000  00000118
       0000000000000000  0000000000000000           0     0     1
  [11] .rodata.cst4      PROGBITS         0000000000000000  00000118
       0000000000000004  0000000000000004  AM       0     0     4
  [12] .symtab           SYMTAB           0000000000000000  00000120
       0000000000000108  0000000000000018          13     3     8
  [13] .strtab           STRTAB           0000000000000000  00000228
       0000000000000067  0000000000000000           0     0     1
  [14] .shstrtab         STRTAB           0000000000000000  000002f0
       000000000000007e  0000000000000000           0     0     1
Key to Flags:
  W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
  L (link order), O (extra OS processing required), G (group), T (TLS),
  C (compressed), x (unknown), o (OS specific), E (exclude),
  D (mbind), l (large), p (processor specific)


See this thread on tinycc-devel ML for reproduction and further analysis
https://lists.nongnu.org/archive/html/tinycc-devel/2026-01/msg00029.html

On my Debian/testing (amd64), binutils installed version =  2.45.50.20251209-1+b1


regards, Laurent

-- System Information:
Debian Release: forky/sid
  APT prefers testing
  APT policy: (990, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.38+deb13-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libc6 depends on:
ii  libc-gconv-modules-extra  2.42-10+b1
ii  libgcc-s1                 15.2.0-12

Versions of packages libc6 recommends:
ii  libidn2-0  2.3.8-4+b1

Versions of packages libc6 suggests:
ii  debconf [debconf-2.0]  1.5.91
pn  glibc-doc              <none>
ii  libc-l10n              2.42-10
ii  libnss-nis             3.1-5+b2
ii  libnss-nisplus         1.3-5+b3
ii  locales                2.42-10

-- debconf information excluded