With tcc they are unconditionally defined except on Windows (which does not
use glibc at all).
C.
From: Tinycc-devel [mailto:tinycc-devel-bounces+eligis=address@hidden]
On Behalf Of ian
Sent: Thursday, January 16, 2020 07:03
To: address@hidden
Subject: *** SPAM *** Re: [Tinycc-devel] Add new _ISOCxx macros?
Hi Christian,
It seems consistent to me.
Regards.
Le 16/01/2020 à 06:55, Christian Jullien a écrit :
Hi all,
When we use tcc on Linux, we also use /usr/include/*.h.
Some definitions are only visible for C11 and controlled by use
of _ISOC11_SOURCE as used by glibc (see for example
http://man7.org/linux/man-pages/man7/feature_test_macros.7.html).
As tcc is C99 by default, I propose to also automatically set
_ISOC99_SOURCE by default but _ISOC11_SOURCE when -std=c11 is
used.
Wdyt?
Reference:
_ISOC99_SOURCE (since glibc 2.1.3)
Exposes declarations consistent with the ISO C99
standard.
Earlier glibc 2.1.x versions recognized an
equivalent macro
named _ISOC9X_SOURCE (because the C99 standard
had not then
been finalized). Although the use of this macro
is obsolete,
glibc continues to recognize it for backward
compatibility.
Defining _ISOC99_SOURCE also exposes ISO C (1990)
Amendment 1
("C95") definitions. (The primary change in C95
was support
for international character sets.)
Invoking the C compiler with the option -std=c99
produces the
same effects as defining this macro.
_ISOC11_SOURCE (since glibc 2.16)
Exposes declarations consistent with the ISO C11
standard.
Defining this macro also enables C99 and C95
features (like
_ISOC99_SOURCE).
Invoking the C compiler with the option -std=c11
produces the
same effects as defining this macro.
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