Changes between Initial Version and Version 1 of MapGuideRfc172

Timestamp:

May 23, 2019, 3:59:09 AM (5 years ago)

Author:

jng

Comment:

--

MapGuideRfc172

@@ +1 @@
+= !MapGuide RFC 172 - Adopt C++11 as the minimum compiler language version =
+
+This page contains a change request (RFC) for the !MapGuide Open Source project.
+More !MapGuide RFCs can be found on the [wiki:MapGuideRfcs RFCs] page.
+
+== Status ==
+
+||RFC Template Version||(1.0)||
+||Submission Date||23 May 2019||
+||Last Modified||23 May 2019||
+||Author||Jackie Ng||
+||RFC Status||draft||
+||Implementation Status||||
+||Proposed Milestone||3.0||
+||Assigned PSC guide(s)||(when determined)||
+||'''Voting History'''||(vote date)||
+||+1||||
+||+0||||
+||-0||||
+||-1||||
+||no vote|| ||
+
+== Overview ==
+
+This RFC proposes to switch to
+[http://en.wikipedia.org/wiki/C%2B%2B11 C++11] compilation mode as
+default throughout the whole C++ source code of MapGuide.
+
+The goal of this RFC is to request and achieve agreement on using
+C++11 as the minimum required version of the C++ programming language
+standard.
+
+== Motivation ==
+
+C++11 is the first major update of the C++ standard since 1998. (?C++03 was a bug fix release.)
+
+Having fewer versions of C++ to support will reduce the load on developers and testing systems.
+
+C++11 features aim to promote writing clean, compact, type-safe and fast code. It also delivers better feature-wise compatibility with the C language (C99).
+
+The Wikipedia article at ?http://en.wikipedia.org/wiki/C++11 does a great job describing all changes in C++11 extensively.
+
+The std::auto_ptr smart pointer, together with a bunch of other features, were deprecated and will be removed from C++17. Features like std::unique_ptr provide much stronger replacements.
+
+Enabling C++11 compilation mode will improve the programming environment making it much friendlier than C++98.
+
+A social factor: since (many) C++ programmers no longer enjoy C++98, allowing C++11 mode may increase potential for new contributions.
+
+From a purely-MapGuide perspective:
+
+ * Establishing C++11 as the baseline puts us in a place to finally take advantage of some libraries which we couldn't in the past (hindering development of some new features as a result) as those libraries themselves require a C++11 compliant compiler to build.
+ * Also FDO implicitly now requires a C++11 compliant compiler on Linux anyways due to the removal of boost and replacing them with C++11 standard library features (eg. `std::mutex`), so it make some sense to be on the same page regarding the expected C++ standards compilation mode.
+
+== Compilers Landscape ==
+
+Summary of compilers supported by GDAL with their minimal versions
+required to compile source code based on
+
+http://en.cppreference.com/w/cpp/compiler_support C++11 features.
+
+=== C++11 ===
+ 
+||GCC  ||4.8.1+      ||[https://gcc.gnu.org/projects/cxx-status.html#cxx11 C++11 status]    ||Debian 8 (stable), Ubuntu 15.04+, Ubuntu 14.04 `ppa:ubuntu-toolchain-r/test`, Fedora 19+, RHEL7 ||
+||Clang||3.3+        ||[https://clang.llvm.org/cxx_status.html#cxx11 C++11 status]          ||Debian 8 (stable), Ubuntu 14.04+, Fedora 19+, CentOS 6(?)||
+||MSVC ||14.0+ (2015)||[https://msdn.microsoft.com/en-us/library/hh567368.aspx C++11 status]||n/a||
+
+=== C++14 ===
+
+The C++14 compilers are listed for comparison only:
+
+||GCC  ||4.9+ ||
+||Clang||3.4+ ||
+||MSVC ||14.0+ (2015)||
+
+== Proposed Solution ==
+
+Windows: No changes required.
+
+Linux/CMake: The CMake build will set default compiler flags to build in C++11 standards mode.
+
+Actual porting of the MapGuide codebase to take advantage of C++11 language features and constructs is not in the scope of this RFC. This RFC is merely seeking consensus that we should now require a C++11 compliant compiler as a minimum requirement to build MapGuide.
+
+The porting of the codebase will be an on-going activity done after adoption of this RFC.
+
+== Implications ==
+
+Windows is not impacted, we will not make any compiler settings changes.
+
+When compiling on Linux, a C++11-compliant compiler is now required.
+
+== Test Plan ==
+
+Verify existing test suites still pass on Linux after activating C++11 compilation mode.
+
+== Funding / Resources ==
+
+Community