[Bug 2036283] Re: i386 glibc is missing fmod in libm.a

[Ariel Machado]

@schopin sorry to contact you directly, but since you removed the ubuntu-sponsors some time ago and the issue has not had any recent activity since that, I wanted to know if there is any progress in including this fix in the affected Noble version.
Currently this bug is preventing static compilation for i386 in the current LTS version 24.04 (noble) forcing distro downgrades in CI/CD that cross-compile projects for that target.
I would appreciate it if you could give some feedback to let me know that the issue is not staled. Thank you

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Title:
  i386 glibc is missing fmod in libm.a

Status in glibc package in Ubuntu:
  Confirmed
Status in zsh package in Ubuntu:
  Confirmed
Status in glibc source package in Noble:
  Confirmed
Status in zsh source package in Noble:
  Confirmed

Bug description:
  [Description]
  The `libm.a` static library on i386 architecture lacks the math function `fmod`:

  (mantic-i386)$ readelf --syms --wide /usr/lib/i386-linux-gnu/libm.a | grep fmod
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodl_compat.o)
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmod_compat.o)
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodf_compat.o)
  File: /usr/lib/i386-linux-gnu/libm.a(e_fmodl.o)
       2: 00000000    23 FUNC    GLOBAL DEFAULT    1 __ieee754_fmodl
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodl.o)
       4: 00000000   148 FUNC    GLOBAL DEFAULT    2 __fmodl
       7: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodl
       9: 00000000   148 FUNC    WEAK   DEFAULT    2 fmodf64x
      10: 00000000   148 FUNC    WEAK   DEFAULT    2 fmodl
  File: /usr/lib/i386-linux-gnu/libm.a(e_fmod.o)
       2: 00000000    23 FUNC    GLOBAL DEFAULT    1 __ieee754_fmod
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmod.o)
  File: /usr/lib/i386-linux-gnu/libm.a(e_fmodf.o)
       2: 00000000    23 FUNC    GLOBAL DEFAULT    1 __ieee754_fmodf
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodf.o)
  File: /usr/lib/i386-linux-gnu/libm.a(e_fmodf128.o)
       7: 00000000  3227 FUNC    GLOBAL DEFAULT    2 __ieee754_fmodf128
      13: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodf128
      14: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodf128
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodf128.o)
       6: 00000000   578 FUNC    GLOBAL DEFAULT    2 __fmodf128
      10: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodf128
      12: 00000000   578 FUNC    WEAK   DEFAULT    2 fmodf128

  [Test Case]

  On a noble host install libc6-dev:i386 package and

  $ readelf --syms --wide /usr/lib/i386-linux-gnu/libm.a | grep fmod

  Without the fix fmod function is not present (see readelf output of
  Description).

  With the fix fmod fuctions are present:

  readelf --syms --wide /usr/lib/i386-linux-gnu/libm.a | grep fmod
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodl_compat.o)
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmod_compat.o)
       4: 00000000   122 FUNC    GLOBAL DEFAULT    2 __fmod
       7: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmod
       9: 00000000   122 FUNC    WEAK   DEFAULT    2 fmodf32x
      10: 00000000   122 FUNC    WEAK   DEFAULT    2 fmodf64
      11: 00000000   122 FUNC    WEAK   DEFAULT    2 fmod
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodf_compat.o)
       4: 00000000   114 FUNC    GLOBAL DEFAULT    2 __fmodf
       7: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodf
       9: 00000000   114 FUNC    WEAK   DEFAULT    2 fmodf32
      10: 00000000   114 FUNC    WEAK   DEFAULT    2 fmodf
  File: /usr/lib/i386-linux-gnu/libm.a(e_fmodl.o)
       2: 00000000    23 FUNC    GLOBAL DEFAULT    1 __ieee754_fmodl
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodl.o)
       4: 00000000   148 FUNC    GLOBAL DEFAULT    2 __fmodl
       7: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodl
       9: 00000000   148 FUNC    WEAK   DEFAULT    2 fmodf64x
      10: 00000000   148 FUNC    WEAK   DEFAULT    2 fmodl
  File: /usr/lib/i386-linux-gnu/libm.a(e_fmod.o)
       2: 00000000    19 FUNC    GLOBAL DEFAULT    1 __ieee754_fmod
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmod.o)
  File: /usr/lib/i386-linux-gnu/libm.a(e_fmodf.o)
       2: 00000000    19 FUNC    GLOBAL DEFAULT    1 __ieee754_fmodf
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodf.o)
  File: /usr/lib/i386-linux-gnu/libm.a(e_fmodf128.o)
       7: 00000000  3227 FUNC    GLOBAL DEFAULT    2 __ieee754_fmodf128
      13: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodf128
      14: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodf128
  File: /usr/lib/i386-linux-gnu/libm.a(w_fmodf128.o)
       6: 00000000   578 FUNC    GLOBAL DEFAULT    2 __fmodf128
      10: 00000000     0 NOTYPE  GLOBAL DEFAULT  UND __ieee754_fmodf128
      12: 00000000   578 FUNC    WEAK   DEFAULT    2 fmodf128

  
  [Regression Potential]

  The patch adds the symbols fmod/fmodf for static builds for i386 and m68k.
  The changes are arch specific, so any regression would affect i386 and m68k for the static libm.a.

  [Other]

  Fix : https://sourceware.org/git/?p=glibc.git;a=commit;h=0b716305dfb48c2d13ed4f7d06c082b90c1d226f
  Affected Ubuntu releases : Noble

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