Implicit declaration of fileno in vfprintf_s.c

[mschulz-at-hilscher]

When compiling with an arm-eabi compiler, I get the following error:

In file included from io/vfprintf_s.c:36:0:
io/vfprintf_s.c: In function ‘vfprintf_s’:
io/vfprintf_s.c:82:18: error: implicit declaration of function ‘fileno’; did you mean ‘mblen’? [-Werror=implicit-function-declaration]
     if (unlikely(fileno(stream) < 0)) {
                  ^
./safeclib_private.h:174:48: note: in definition of macro ‘_expect’
 #define _expect(expr, value) __builtin_expect((expr), (value))
                                                ^~~~
io/vfprintf_s.c:82:9: note: in expansion of macro ‘unlikely’
     if (unlikely(fileno(stream) < 0)) {
         ^~~~~~~~
io/vfprintf_s.c:82:18: error: nested extern declaration of ‘fileno’ [-Werror=nested-externs]
     if (unlikely(fileno(stream) < 0)) {
                  ^
./safeclib_private.h:174:48: note: in definition of macro ‘_expect’
 #define _expect(expr, value) __builtin_expect((expr), (value))
                                                ^~~~
io/vfprintf_s.c:82:9: note: in expansion of macro ‘unlikely’
     if (unlikely(fileno(stream) < 0)) {
         ^~~~~~~~

[rurban]

Which compiler exactly? Which header is missing?

[mschulz-at-hilscher]

It seems like our embedded system does not support certain posix functions by default such as fileno and ftruncate. Maybe that is something that could be checked during the configure run.

In the end, we are using the gcc compiler from ecospro (https://www.ecoscentric.com/ecos/ecospro.shtml) and its c library.

[rurban]

Oh, I see. Will add probes then

[jleffler]

You might only need to activate the POSIX symbols with -D_POSIX_SOURCE= <value> or -D_XOPEN_SOURCE=800. Jonathan Leffler ***@***.***> #include <disclaimer.h> Guardian of DBD::Informix - v2018.1031 - http://dbi.perl.org "Blessed are we who can laugh at ourselves, for we shall never cease to be amused."

…

On Wed, Apr 10, 2024 at 11:40 Reini Urban ***@***.***> wrote: Oh, I see. Will add probes then — Reply to this email directly, view it on GitHub <#136 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACCAHBR4K7NMVISAP5FORETY4V2RBAVCNFSM6AAAAABF6QUN3OVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDANBYGEZDGOBRHE> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>