URL: <https://savannah.gnu.org/support/?110286>
Summary: Make it possible to request a specific (non-latest) version of a language standard Project: Autoconf Submitted by: zackw Submitted on: Mon 27 Jul 2020 06:31:37 PM UTC Category: None Priority: 5 - Normal Severity: 1 - Wish Status: None Privacy: Public Assigned to: None Originator Email: Open/Closed: Open Discussion Lock: Any Operating System: None _______________________________________________________ Details: Feedback on the 2.69b beta indicates that users find the new behavior of AC_PROG_CC and AC_PROG_CXX, automatically selecting the latest supported language standard, problematic. Quoting https://lists.gnu.org/archive/html/autoconf/2020-07/msg00010.html : > One issue we [PostgreSQL] would like to point out is that > the new scheme of automatically checking for the latest > version of the C and C++ standards (deprecating AC_PROG_CC_C99 > etc.) is problematic... > > [W]e have set C99 as the project standard. So checking for > C11 is (a) useless, and (b) bad because we don't want > developers to accidentally make use of C11 features and have > the compiler accept them silently. > > It looks like it's not easy to disable these tests even > with low-level hackery. It would be better if there were > still a way to set the preferred level of C and C++ in > an official way. and https://lists.gnu.org/archive/html/autoconf/2020-07/msg00012.html : > Particularly as applies to C++, it is useful to be able > to set an upper bar (and lower bar) for the C++ version > requested because C++11 is in many ways not similar to > older C++. I am already aware that some of my own software > will not compile with C++11 because of removed deprecated > features which I have not attended to yet in the code. > Furthermore, the ABI often changes between C++ versions > and it is useful to be able to specify the C++ version > for purposes of the ABI. _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/support/?110286> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/