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, 12 insertions, 26 deletions

diff --git a/gdb/configure.nat b/gdb/configure.nat
index bf851f5..3794663 100644
--- a/gdb/configure.nat
+++ b/gdb/configure.nat
@@ -85,6 +85,12 @@ case ${gdb_host} in
     darwin)
 	NATDEPFILES='fork-child.o fork-inferior.o darwin-nat.o \
 	    darwin-nat-info.o'
+	;;
+    sol2)
+	NATDEPFILES='fork-child.o fork-inferior.o \
+	    procfs.o proc-api.o proc-events.o proc-flags.o proc-why.o \
+	    sol-thread.o'
+	HAVE_NATIVE_GCORE_HOST=1
         ;;
 esac
 
@@ -212,17 +218,6 @@ case ${gdb_host} in
 		;;
 	esac
 	;;
-    i386sol2)
-	case ${gdb_host_cpu} in
-	    i386)
-		# Host: Solaris x86
-		NATDEPFILES='fork-child.o fork-inferior.o \
-		i386-v4-nat.o i386-sol2-nat.o \
-		procfs.o proc-api.o proc-events.o proc-flags.o proc-why.o'
-		HAVE_NATIVE_GCORE_HOST=1
-		;;
-	esac
-	;;
     linux)
 	case ${gdb_host_cpu} in
 	    aarch64)
@@ -461,24 +456,15 @@ case ${gdb_host} in
 	;;
     sol2)
 	case ${gdb_host_cpu} in
+	    i386)
+		# Host: Solaris x86_64
+		NATDEPFILES="${NATDEPFILES} \
+		amd64-nat.o i386-v4-nat.o i386-sol2-nat.o"
+		;;
 	    sparc)
 		# Host: Solaris SPARC & UltraSPARC
 		NAT_FILE='nm-sol2.h'
-		NATDEPFILES='sparc-sol2-nat.o \
-		fork-child.o fork-inferior.o \
-		procfs.o proc-api.o proc-events.o proc-flags.o proc-why.o'
-		HAVE_NATIVE_GCORE_HOST=1
-		;;
-	esac
-	;;
-    sol2-64)
-	case ${gdb_host_cpu} in
-	    i386)
-		# Host: Solaris x86_64
-		NATDEPFILES='fork-child.o fork-inferior.o \
-		amd64-nat.o i386-v4-nat.o i386-sol2-nat.o \
-		procfs.o proc-api.o proc-events.o proc-flags.o proc-why.o'
-		HAVE_NATIVE_GCORE_HOST=1
+		NATDEPFILES="${NATDEPFILES} sparc-sol2-nat.o"
 		;;
 	esac
 	;;