[Tinycc-devel] Add new _ISOCxx macros?

[Christian Jullien]

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  Although the use of this macro is obsolete,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.