[Bug libc/10103] New: Targets defining __NO_LONG_DOUBLE_MATH should still have *l prototypes in headers.

[Bug libc/10103] New: Targets defining __NO_LONG_DOUBLE_MATH should still have *l prototypes in headers.

[carlos at codesourcery dot com]

Many targets in ports, ARM, and HPPA to name two, do not have long double math,
but the compiler treats double and long double as distinct types even though
they have the same size. The GNU C library currently creates aliases to all the
*l functions when long-double-fcts = no, but fails to create *l prototypes in
the headers. To be ISO C99 conforming the headers must have *l prototypes.

Jakub Jelinek proposes a patch here:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39491#c21

Joseph Myers has verified that this patch works for ARM here:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39491#c24

Carlos O'Donell has verified that this path works for HPPA here:

Jakub, could you please attach your patch to this issue with a proper ChangeLog?
I would like this patch to be reviewed and checked into glibc.

Thanks.

-- 
           Summary: Targets defining __NO_LONG_DOUBLE_MATH should still have
                    *l prototypes in headers.
           Product: glibc
           Version: 2.10
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: carlos at codesourcery dot com
                CC: glibc-bugs at sources dot redhat dot com,jakub at redhat
                    dot com,joseph at codesourcery dot com
 GCC build triplet: hppa-linux-gnu
  GCC host triplet: hppa-linux-gnu
GCC target triplet: hppa-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=10103

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[Bug libc/10103] Targets defining __NO_LONG_DOUBLE_MATH should still have *l prototypes in headers.

[carlos at codesourcery dot com]

------- Additional Comments From carlos at codesourcery dot com  2009-04-24 20:32 -------
Carlos O'Donell has verified that this path works for HPPA here:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39491#c25

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[Bug libc/10103] Targets defining __NO_LONG_DOUBLE_MATH should still have *l prototypes in headers.

[jakub at redhat dot com]

------- Additional Comments From jakub at redhat dot com  2009-04-24 20:36 -------
http://sources.redhat.com/ml/libc-hacker/2009-04/msg00004.html

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http://sourceware.org/bugzilla/show_bug.cgi?id=10103

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[Bug libc/10103] Targets defining __NO_LONG_DOUBLE_MATH should still have *l prototypes in headers.

[carlos at codesourcery dot com]

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------- Additional Comments From carlos at codesourcery dot com  2009-04-27 17:01 -------
I tested the following patch on hppa:
http://sources.redhat.com/ml/libc-hacker/2009-04/msg00004.html

No regressions. However, I don't see the long double prototypes.

The port sets __NO_LONG_DOUBLE_MATH set to 1, and I verified this.
The build sets NO_LONG_DOUBLE to 1 because the port sets long-double-fcts = no.

Compiling test-ldouble.c with -Werror fails because of the missing prototypes.
math/libm-test.c:5446: warning: implicit declaration of function ‘scalbl’
math/libm-test.c: In function ‘scalbn_test’:

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[Bug libc/10103] Targets defining __NO_LONG_DOUBLE_MATH should still have *l prototypes in headers.

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=10103

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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[Bug libc/10103] Targets defining __NO_LONG_DOUBLE_MATH should still have *l prototypes in headers.

[schwab@linux-m68k.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=10103

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Andreas Schwab <schwab@linux-m68k.org> 2011-11-04 14:25:09 UTC ---
Fixed in master.

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