[Bug libc/11882] New: Should headers default to strict ISO C99?

[Bug libc/11882] New: Should headers default to strict ISO C99?

[carlos at codesourcery dot com]

The following commit:
http://sourceware.org/git/?p=glibc.git;a=commit;h=3e6b0a28ebc2319262b318790019558f78249c8b
updates the include/features.h headers to default _POSIX_C_SOURCE to 200809L,
this in turn defines __USE_ISOC99 to 1, and this causes the headers to trigger
strict ISO C99 mode which redirects sscanf to __isoc99_sscanf.

Applications that were previously using the sscanf format specifier '%a' (a GNU
extension) stop working. Using -std=gnu89, -std=gnu99 does not allow you to get
back the previous behaviour. Using -std=c89 or -D_GNU_SOURCE restores the
previous behaviour of supporting '%a' (now '%m' in POSIX).

The compiler is still defaulting to -std=gnu89.

Is it glibc's intent to default to strict ISO C99 mode?

-- 
           Summary: Should headers default to strict ISO C99?
           Product: glibc
           Version: 2.12
            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
 GCC build triplet: arm-none-linux-gnueabi
  GCC host triplet: arm-none-linux-gnueabi
GCC target triplet: arm-none-linux-gnueabi


http://sourceware.org/bugzilla/show_bug.cgi?id=11882

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[Bug libc/11882] Should headers default to strict ISO C99?

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2010-08-04 18:17 -------
(In reply to comment #0)
> Is it glibc's intent to default to strict ISO C99 mode?

It always has been.  If you use GNU extension you have to use _GNU_SOURCE.

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


http://sourceware.org/bugzilla/show_bug.cgi?id=11882

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[Bug libc/11882] Should headers default to strict ISO C99?

[carlos at codesourcery dot com]

------- Additional Comments From carlos at codesourcery dot com  2010-08-04 18:26 -------
Thanks Ulrich.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=11882

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[Bug libc/11882] Should headers default to strict ISO C99?

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=11882

Florian Weimer <fweimer at redhat dot com> changed:

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

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