[PATCH] doc: Document Solaris D bootstrap requirements [PR 103528]

[Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>]

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This patch documents the Solaris-specific D bootstrap requirements.

Tested by building and inspecting gccinstall.{pdf,info}.

Ok for trunk?

I've omitted the Darwin-specific stuff so far documented in PRs d/103577
and d/103578:

* needs --enable-libphobos
* top of gcc-11 branch only
* backport of -static-libphobos patch
* Darwin/i386 doesn't work at all

	Rainer

-- 
-----------------------------------------------------------------------------
Rainer Orth, Center for Biotechnology, Bielefeld University


2022-03-16  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc:
	PR d/103528
	* doc/install.texi (Tools/packages necessary for building GCC)
	(GDC): Document libphobos requirement.
	(Host/target specific installation notes for GCC, *-*-solaris2*):
	Document libphobos and GDC specifics.


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# HG changeset patch
# Parent  33de4c9d886299fd8cc97e20c0f761c2f28a3eef
doc: Document Solaris D bootstrap requirements [PR 103528]

diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -287,7 +287,8 @@ 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.
+compiler (GCC version 9.1 or later) and D runtime library,
+@samp{libphobos}, 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.
@@ -303,6 +304,10 @@ front end does not make use of any GDC-s
 of the D language, if too old a GDC version is installed and
 @option{--enable-languages=d} is used, the build will fail.
 
+On some targets, @samp{libphobos} isn't enabled by default, but compiles
+and works if @option{--enable-libphobos} is used.  Specifics are
+documented for affected targets.
+
 @item A ``working'' POSIX compatible shell, or GNU bash
 
 Necessary when running @command{configure} because some
@@ -4851,6 +4856,12 @@ GNU binutils.  @samp{libstdc++} symbol v
 appropriate version is found.  Solaris @command{c++filt} from the Solaris
 Studio compilers does @emph{not} work.
 
+In order to build the GNU D compiler, GDC, a working @samp{libphobos} is
+needed.  That library wasn't built by default in GCC 9--11 on SPARC, or
+on x86 when the Solaris assembler is used, but can be enabled by
+configuring with @option{--enable-libphobos}.  Also, GDC 9.4.0 is
+required on x86, while GDC 9.3.0 is known to work on SPARC.
+
 The versions of the GNU Multiple Precision Library (GMP), the MPFR
 library and the MPC library bundled with Solaris 11.3 and later are
 usually recent enough to match GCC's requirements.  There are two
@@ -4864,6 +4875,7 @@ need to configure with @option{--with-gm
 @item
 The version of the MPFR libary included in Solaris 11.3 is too old; you
 need to provide a more recent one.
+
 @end itemize
 
 @html