Remove support for Solaris < 10 (PR gdb/22185)

Given that GCC has obsoleted/removed support for Solaris 9 in GCC 4.9/5 in 2013:

    https://gcc.gnu.org/gcc-4.9/changes.html
    https://gcc.gnu.org/ml/gcc-patches/2013-05/msg00728.html

and the last gdb version that can be compiled with gcc 4.9 is 7.12.1 only when
configured with --disable-build-with-cxx, it's time to obsolete/remove support
for Solaris < 10.

This patch does this, simplifying configure.nat along the way (only a single
sol2 configuration with variants for i386 and sparc).

Some configure checks for older Solaris versions can go, too, and the check
for libthread_db.so.1 removed:

* Since Solaris 10, dlopen has moved to libc and libdl.so is just a
  filter on ld.so.1, so no need to check.

* $RDYNAMIC is already handled above (and is a no-op with Solaris ld
  anyway).

Both proc-service.c and sol-thread.c lose support for (Solaris-only)
PROC_SERVICE_IS_OLD.

The attached revised patch has been tested on sparcv9-sun-solaris2.10,
sparcv9-sun-solaris2.11.4, amd64-pc-solaris2.10, amd64-pc-solaris2.11.4,
and x86_64-pc-linux-gnu.

I've also started an i386-pc-solaris2.9 build to check that it really
stops as expected.

	PR gdb/22185
	* configure.host <*-*-solaris2.[01], *-*-solaris2.[2-9]*>: Mark as
	obsolete.
	Use gdb_host sol2 for i[34567]86-*-solaris2*, x86_64-*-solaris2*.
	Remove i386sol2 support.
	* configure.nat <i386sol2>: Remove.
	<sol2-64>: Fold into ...
	<sol2>: ... this.
	Move common settings to default section.
	Add sol-thread.o.
	* configure.tgt <i[34567]86-*-solaris2.1[0-9]*,
	x86_64-*-solaris2.1[0-9]*>: Rename to ...
	<i[34567]86-*-solaris2*, x86_64-*-solaris2*>: ... this.
	<i[34567]86-*-solaris*>: Remove.
	<sparc-*-solaris2.[0-6], sparc-*-solaris2.[0-6].*>: Remove.

	* configure.ac: Remove wctype in libw check.
	(_MSE_INT_H): Don't define on Solaris 7-9.
	<solaris*>: Remove libthread_db.so.1 check.
	* configure: Regenerate.
	* config.in: Regenerate.

	* proc-service.c: Remove PROC_SERVICE_IS_OLD handling.
	(gdb_ps_prochandle_t, gdb_ps_read_buf_t, gdb_ps_write_buf_t)
	(gdb_ps_size_t): Remove.
	Use base types in users.
	* sol-thread.c: Likewise, also for gdb_ps_addr_t.

	* NEWS (Changes since GDB 8.0): Document Solaris 2.0-9 removal.

1 files changed, 0 insertions, 17 deletions

diff --git a/gdb/config.in b/gdb/config.in
index 4a40956ae06..9fa90afcf83 100644
--- a/gdb/config.in
+++ b/gdb/config.in
@@ -231,9 +231,6 @@
 /* Define if you have the babeltrace library. */
 #undef HAVE_LIBBABELTRACE
 
-/* Define to 1 if you have the `dl' library (-ldl). */
-#undef HAVE_LIBDL
-
 /* Define if you have the expat library. */
 #undef HAVE_LIBEXPAT
 
@@ -267,9 +264,6 @@
 /* Define to 1 if you have the <libunwind-ia64.h> header file. */
 #undef HAVE_LIBUNWIND_IA64_H
 
-/* Define to 1 if you have the `w' library (-lw). */
-#undef HAVE_LIBW
-
 /* Define to 1 if you have the <linux/perf_event.h> header file. */
 #undef HAVE_LINUX_PERF_EVENT_H
 
@@ -567,9 +561,6 @@
 /* Define to 1 if you have the <thread_db.h> header file. */
 #undef HAVE_THREAD_DB_H
 
-/* Define if using Solaris thread debugging. */
-#undef HAVE_THREAD_DB_LIB
-
 /* Define to 1 if you have the `ttrace' function. */
 #undef HAVE_TTRACE
 
@@ -667,10 +658,6 @@
 /* Define to 1 if the "%ll" format works to print long longs. */
 #undef PRINTF_HAS_LONG_LONG
 
-/* Define if <proc_service.h> on solaris uses int instead of size_t, and
-   assorted other type changes. */
-#undef PROC_SERVICE_IS_OLD
-
 /* Define to the type of arg 1 for ptrace. */
 #undef PTRACE_TYPE_ARG1
 
@@ -810,10 +797,6 @@
 /* Define to 1 if on MINIX. */
 #undef _MINIX
 
-/* Define to 1 to avoid a clash between <widec.h> and <wchar.h> on Solaris
-   2.[789] when using GCC. */
-#undef _MSE_INT_H
-
 /* Define to 2 if the system does not provide POSIX.1 features except with
    this defined. */
 #undef _POSIX_1_SOURCE