Hi, As asked for, this adds the documentation note in install.texi about the upcoming bootstrap requirements.
Obviously this will be applied alongside the patch posted previously: https://gcc.gnu.org/pipermail/gcc-patches/2021-October/582917.html Final batch of testing before proceeding has taking a bit longer than I expected. Currently bootstrapping on sparcv9-sun-solaris2.11, and will push forward once have confirmed that it works as well as the current C++ implementation of the D front end. OK for mainline? Any improvements on wording? Thanks, Iain. --- gcc/ChangeLog: * doc/install.texi (Prerequisites): Add note that D front end now requires GDC installed in order to bootstrap. (Building): Add D compiler section, referencing prerequisites. --- gcc/doc/install.texi | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index 094469b9a4e..6f999a2fd5a 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -289,6 +289,25 @@ Ada runtime libraries. You can check that your build environment is clean by verifying that @samp{gnatls -v} lists only one explicit path in each section. +@item @anchor{GDC-prerequisite}GDC + +In order to build GDC, the D compiler, you need a working GDC +compiler (GCC version 9.1 or later), as the D front end is written in D. + +Versions of GDC prior to 12 can be built with an ISO C++11 compiler, which can +then be installed and used to bootstrap newer versions of the D front end. + +It is strongly recommended to use an older version of GDC to build GDC. More +recent versions of GDC than the version built are not guaranteed to work and +will often fail during the build with compilation errors relating to +deprecations or removed features. + +Note that @command{configure} does not test whether the GDC installation works +and has a sufficiently recent version. Though the implementation of the D +front end does not make use of any GDC-specific extensions, or novel features +of the D language, if too old a GDC version is installed and +@option{--enable-languages=d} is used, the build will fail. + @item A ``working'' POSIX compatible shell, or GNU bash Necessary when running @command{configure} because some @@ -2977,6 +2996,15 @@ and network filesystems. @uref{prerequisites.html#GNAT-prerequisite,,GNAT prerequisites}. @end ifhtml +@section Building the D compiler + +@ifnothtml +@ref{GDC-prerequisite}. +@end ifnothtml +@ifhtml +@uref{prerequisites.html#GDC-prerequisite,,GDC prerequisites}. +@end ifhtml + @section Building with profile feedback It is possible to use profile feedback to optimize the compiler itself. This -- 2.30.2
