Re: newlib header breaks restricted pointers in C++
Sebastian Huber <[email protected]>
| Newsgroups | gmane.comp.lib.newlib |
|---|---|
| Message-ID | <[email protected]> |
On 25.07.23 19:35, Corinna Vinschen wrote: > Hi Bruno, > > On Jul 24 22:23, Bruno De Fraine wrote: >> Hello, >> >> As an extension, GCC and clang offer C99-style restricted pointers in C++ mode: >> https://gcc.gnu.org/onlinedocs/gcc/Restricted-Pointers.html >> >> We notice that this extension is broken when including newlib headers: restricted pointers are treated as ordinary pointers. >> >> We traced this to the following section of newlib/libc/include/sys/cdefs.h: >> >> /* >> * GCC 2.95 provides `__restrict' as an extension to C90 to support the >> * C99-specific `restrict' type qualifier. We happen to use `__restrict' as >> * a way to define the `restrict' type qualifier without disturbing older >> * software that is unaware of C99 keywords. >> */ >> #if !(__GNUC__ == 2 && __GNUC_MINOR__ == 95) >> #if !defined(__STDC_VERSION__) || __STDC_VERSION__ < 199901 >> #define __restrict >> #else >> #define __restrict restrict >> #endif >> #endif >> >> While the GCC __restrict extension was indeed introduced in GCC 2.95, it is not limited to this version; the extension is also not limited to C90: >> https://gcc.gnu.org/gcc-2.95/c++features.html > Either way, the above has been taken from FreeBSD, and it is still, > as of today, the same expression as used in FreeBSDs sys/cdefs.h > file. > > Seb, any input on this? I added a FreeBSD bug report: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272723 -- embedded brains GmbH Herr Sebastian HUBER Dornierstr. 4 82178 Puchheim Germany email: [email protected] phone: +49-89-18 94 741 - 16 fax: +49-89-18 94 741 - 08 Registergericht: Amtsgericht München Registernummer: HRB 157899 Vertretungsberechtigte Geschäftsführer: Peter Rasmussen, Thomas Dörfler Unsere Datenschutzerklärung finden Sie hier: https://embedded-brains.de/datenschutzerklaerung/