[Bug math/31760] New: Missing math functions

[Bug math/31760] New: Missing math functions

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31760

            Bug ID: 31760
           Summary: Missing math functions
           Product: glibc
           Version: 2.40
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

The following math functions are only exported from libm.a, not libm.so:

scalbf32
scalbf32x
scalbf64
scalbf64x
significandf32
significandf32x
significandf64

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[Bug math/31760] Missing math functions

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31760

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jsm28 at gcc dot gnu.org

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[Bug math/31760] Missing math functions

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31760

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
There are

libm-test-isfinite.inc:#if !TEST_FLOATN
libm-test-lgamma.inc:#if !TEST_FLOATN
libm-test-nexttoward.inc:#if !TEST_FLOATN
libm-test-nexttoward.inc:#if !TEST_FLOATN
libm-test-remainder.inc:#if !TEST_FLOATN
libm-test-scalb.inc:#if !TEST_FLOATN
libm-test-scalb.inc:#if !TEST_FLOATN
libm-test-significand.inc:#if !TEST_FLOATN
libm-test-significand.inc:#if !TEST_FLOATN
test-double.h:#define TEST_FLOATN 0
test-float.h:#define TEST_FLOATN 0
test-ldouble.h:#define TEST_FLOATN 0
test-math-floatn.h:#define TEST_FLOATN 1

It looks like that

scalbf32
scalbf32x
scalbf64
scalbf64x
significandf32
significandf32x
significandf64

are excluded on purpose.

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[Bug math/31760] Missing math functions

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31760

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |murphyp at linux dot vnet.ibm.com

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
#if !TEST_FLOATN

was added by

commit 3c023dbf5780f5afe8a5ea8e17667719307d955f
Author: Paul E. Murphy <murphyp@linux.vnet.ibm.com>
Date:   Fri Jul 15 14:29:51 2016 -0500

    float128: Add test-{float128,ifloat128,float128-finite}

    This adds test support for float128, and lays some groundwork for future
    _FloatN types.

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[Bug math/31760] Missing math functions

[adhemerval.zanella at linaro dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31760

Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |adhemerval.zanella at linaro dot o
                   |                            |rg

--- Comment #3 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
For scalb, my understanding is since this is a deprecated interface (it was
obsolescent in POSIX.1-2001; Removed in POSIX.1-2008, never made to C
standard), when the newer interface for ISO/IEC TS 18661-3:2015 was added
(glibc 2.27) it did not make sense to add this support to the symbol.

The significant is a similar symbol, where it seems to come originally from BSD
and never made in any standard.

So I think we should remove the fXX alias for static build as well.

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[Bug math/31760] Missing math functions

[jsm28 at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31760

--- Comment #4 from Joseph Myers <jsm28 at gcc dot gnu.org> ---
Indeed, these aliases should be removed.

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[Bug math/31760] Missing math functions

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=31760

--- Comment #5 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <hjl@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=a34f76edbda8a0b143111e670ca33c97623bfe56

commit a34f76edbda8a0b143111e670ca33c97623bfe56
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon May 20 09:56:36 2024 -0700

    Don't provide scalb/significand _FloatN aliases [BZ #31760]

    scalb is a deprecated interface which was obsolescent in POSIX.1-2001,
    removed in POSIX.1-2008, never made to C standard.  significant was
    originally from BSD and never made in any standard.  Fix BZ #31760 by
    not providing _FloatN aliases for them.

    Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

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[Bug math/31760] Missing math functions

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31760

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |2.40

--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed in 2.40.

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