Remove obsolete Solaris 11.3 support

Support for Solaris 11.3 had already been obsoleted in GCC 13.  However,
since the only Solaris system in the cfarm was running 11.3, I've kept
it in tree until now when both Solaris 11.4/SPARC and x86 systems have
been added.

This patch actually removes the Solaris 11.3 support.  Apart from
several minor simplifications, there are two more widespread changes:

* In Solaris 11.4, libsocket and libnsl were folded into libc, so
  there's no longer a need to link them explictly.

* Since Solaris 11.4, Solaris includes all crts needed by gcc (like
  crt1.o and gcrt1.o) with the base system.  All workarounds to provide
  fallbacks can thus go.

Bootstrapped without regressions on i386-pc-solaris2.11 and
sparc-sun-solaris2.11 (as/ld, gas/ld, and gas/gld) as well as Solaris
11.3/x86 to ascertain that version is actually rejected.

2024-04-30  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	c++tools:
	* configure.ac (ax_lib_socket_nsl.m4): Don't sinclude.
	(AX_LIB_SOCKET_NSL): Don't call.
	(NETLIBS): Remove.
	* configure: Regenerate.
	* Makefile.in (NETLIBS): Remove.
	(g++-mapper-server$(exeext)): Remove $(NETLIBS).

	gcc:
	* config.gcc: Move *-*-solaris2.11.[0-3]* to unsupported list.
	<*-*-solaris2*> (default_use_cxa_atexit): Set unconditionally.
	* configure.ac (AX_LIB_SOCKET_NSL): Don't call.
	(NETLIBS): Remove.
	(gcc_cv_ld_aligned_shf_merge): Remove.
	(hidden_linkonce) <i?86-*-solaris2* | x86_64-*-solaris2*>: Remove.
	(gcc_cv_target_dl_iterate_phdr) <*-*-solaris2*>: Always set to yes.
	* Makefile.in (NETLIBS): Remove.
	* configure, config.in, aclocal.m4: Regenerate.
	* config/sol2.h: Don't check HAVE_SOLARIS_CRTS.
	(STARTFILE_SPEC): Remove !HAVE_SOLARIS_CRTS case.
	[USE_GLD] (LINK_EH_SPEC): Remove TARGET_DL_ITERATE_PHDR guard.
	* config/i386/i386.cc (USE_HIDDEN_LINKONCE): Remove guard.
	* varasm.cc (mergeable_string_section): Remove
	HAVE_LD_ALIGNED_SHF_MERGE handling.
	(mergeable_constant_section): Likewise.

	* doc/install.texi (Specific,i?86-*-solaris2*): Reference Solaris
	11.4 only.
	(Specific, *-*-solaris2*): Document Solaris 11.3 removal.  Remove
	11.3 references and caveats.  Update for 11.4.

	gcc/cp:
	* Make-lang.in (cc1plus$(exeext)): Remove $(NETLIBS).

	gcc/objcp:
	* Make-lang.in (cc1objplus$(exeext)): Remove $(NETLIBS).

	gcc/testsuite:
	* lib/target-supports.exp (check_effective_target_pie): Always
	enable on *-*-solaris2*.

	libgcc:
	* configure.ac <*-*-solaris2*> (libgcc_cv_solaris_crts): Remove.
	* config.host <*-*-solaris2*>: Remove !libgcc_cv_solaris_crts
	support.
	* configure, config.in: Regenerate.
	* config/sol2/gmon.c (internal_mcount) [!HAVE_SOLARIS_CRTS]: Remove.
	* config/i386/sol2-c1.S, config/sparc/sol2-c1.S: Remove.
	* config/sol2/t-sol2 (crt1.o, gcrt1.o): Remove.

	libstdc++-v3:
	* testsuite/lib/dg-options.exp (add_options_for_net_ts)
	<*-*-solaris2*>: Don't link with -lsocket -lnsl.

1 files changed, 12 insertions, 27 deletions

diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 9f2e427..42b462a 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -4293,7 +4293,7 @@ found on @uref{https://www.bitwizard.nl/sig11/,,www.bitwizard.nl}.
 @end html
 @anchor{ix86-x-solaris2}
 @heading i?86-*-solaris2*
-Use this for Solaris 11.3 or later on x86 and x86-64 systems.  Starting
+Use this for Solaris 11.4 on x86 and x86-64 systems.  Starting
 with GCC 4.7, there is also a 64-bit @samp{amd64-*-solaris2*} or
 @samp{x86_64-*-solaris2*} configuration that corresponds to
 @samp{sparcv9-sun-solaris2*}.
@@ -4895,15 +4895,12 @@ supported as cross-compilation target only.
 @end html
 @anchor{x-x-solaris2}
 @heading *-*-solaris2*
-Support for Solaris 11.3 and earlier has been obsoleted in GCC 13, but
-can still be enabled by configuring with @option{--enable-obsolete}.
+Support for Solaris 11.3 and earlier has been removed in GCC 15.
 Support for Solaris 10 has been removed in GCC 10.  Support for Solaris
 9 has been removed in GCC 5.  Support for Solaris 8 has been removed in
 GCC 4.8.  Support for Solaris 7 has been removed in GCC 4.6.
 
-Solaris 11.3 provides GCC 4.5.2, 4.7.3, and 4.8.2 as
-@command{/usr/gcc/4.5/bin/gcc} or similar.  Solaris 11.4
-provides one or more of GCC 5, 7, 9, 10, 11, and 12.
+Solaris 11.4 provides one or more of GCC 5, 7, 9, 10, 11, 12, and 13.
 
 You need to install the @code{system/header}, @code{system/linker}, and
 @code{developer/assembler} packages.
@@ -4922,18 +4919,18 @@ of the build.
 We recommend the use of the Solaris assembler or the GNU assembler, in
 conjunction with the Solaris linker.
 
-The GNU @command{as} versions included in Solaris 11.3, from GNU
-binutils 2.23.1 or newer (in @file{/usr/bin/gas} and
+The GNU @command{as} versions included in Solaris 11.4, from GNU
+binutils 2.30.1 or newer (in @file{/usr/bin/gas} and
 @file{/usr/gnu/bin/as}), are known to work.  The version from GNU
-binutils 2.40 is known to work as well.  Recent versions of the Solaris
+binutils 2.42 is known to work as well.  Recent versions of the Solaris
 assembler in @file{/usr/bin/as} work almost as well, though.  To use GNU
 @command{as}, configure with the options @option{--with-gnu-as
 --with-as=@//usr/@/gnu/@/bin/@/as}.
 
 For linking, the Solaris linker is preferred.  If you want to use the
-GNU linker instead, the version in Solaris 11.3, from GNU binutils
-2.23.1 or newer (in @file{/usr/gnu/bin/ld} and @file{/usr/bin/gld}),
-works, as does the version from GNU binutils 2.40.  However, it
+GNU linker instead, the version in Solaris 11.4, from GNU binutils
+2.30.1 or newer (in @file{/usr/gnu/bin/ld} and @file{/usr/bin/gld}),
+works, as does the version from GNU binutils 2.42.  However, it
 generally lacks platform specific features, so better stay with Solaris
 @command{ld}.  To use the LTO linker plugin
 (@option{-fuse-linker-plugin}) with GNU @command{ld}, GNU binutils
@@ -4957,7 +4954,7 @@ will be disabled if no appropriate version is found.  Solaris
 work.
 
 In order to build the GNU Ada compiler, GNAT, a working GNAT is needed.
-Since Solaris 11.4 SRU 39, GNAT 11 or 12 is bundled in the
+Since Solaris 11.4 SRU 39, GNAT 11, 12 or 13 is bundled in the
 @code{developer/gcc/gcc-gnat} package.
 
 In order to build the GNU D compiler, GDC, a working @samp{libphobos} is
@@ -4967,20 +4964,8 @@ 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
-caveats:
-
-@itemize @bullet
-@item
-While the version of the GMP library in Solaris 11.3 works with GCC, you
-need to configure with @option{--with-gmp-include=/usr/include/gmp}.
-
-@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
+library and the MPC library bundled with Solaris 11.4 are
+recent enough to match GCC's requirements.
 
 @html
 <hr />