Remove support for PowerPC SPE extension (powerpc*-*-*gnuspe*).

GCC 9 dropped support for the SPE extensions to PowerPC, which means
powerpc*-*-*gnuspe* configurations are no longer buildable with that
compiler.  This ISA extension was peculiar to the “e500” line of
embedded PowerPC chips, which, as far as I can tell, are no longer
being manufactured, so I think we should follow suit.

This patch was developed by grepping for “e500”, “__SPE__”, and
“__NO_FPRS__”, and may not eliminate every vestige of SPE support.
Most uses of __NO_FPRS__ are left alone, as they are relevant to
normal embedded PowerPC with soft-float.

        * sysdeps/powerpc/preconfigure: Error out on powerpc-*-*gnuspe*
        host type.
        * scripts/build-many-glibcs.py: Remove powerpc-*-linux-gnuspe
        and powerpc-*-linux-gnuspe-e500v1 from list of build configurations.

        * sysdeps/powerpc/powerpc32/e500: Recursively delete.
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/e500: Recursively delete.
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/context-e500.h:
        Delete.

        * sysdeps/powerpc/fpu_control.h: Remove SPE variant.
        Issue an #error if used with a compiler in SPE-float mode.
        * sysdeps/powerpc/powerpc32/__longjmp_common.S
        * sysdeps/powerpc/powerpc32/setjmp_common.S
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/getcontext-common.S
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/getcontext.S
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/setcontext.S
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/swapcontext.S
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/setcontext-common.S
        * sysdeps/unix/sysv/linux/powerpc/powerpc32/swapcontext-common.S:
        Remove code to preserve SPE register state.

        * sysdeps/unix/sysv/linux/powerpc/elision-lock.c
        * sysdeps/unix/sysv/linux/powerpc/elision-trylock.c
        * sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
        Remove __SPE__ ifndefs.

1 files changed, 12 insertions, 8 deletions

diff --git a/sysdeps/powerpc/preconfigure b/sysdeps/powerpc/preconfigure
index e3ad6ec57f..a0ea745bb4 100644
--- a/sysdeps/powerpc/preconfigure
+++ b/sysdeps/powerpc/preconfigure
@@ -8,14 +8,18 @@ powerpc64*)
   base_machine=powerpc machine=powerpc/powerpc64/be
   ;;
 powerpc*)
-  # Check for e500.
-  $CC $CFLAGS $CPPFLAGS -E -dM -xc /dev/null > conftest.i
-  if grep -q __NO_FPRS__ conftest.i && ! grep -q _SOFT_FLOAT conftest.i; then
-    base_machine=powerpc machine=powerpc/powerpc32/e500
-  else
-    base_machine=powerpc machine=powerpc/powerpc32
-  fi
-  rm -f conftest.i
+  base_machine=powerpc machine=powerpc/powerpc32
   with_fp_cond="!defined __NO_FPRS__"
+  case "$host_os" in
+    *gnuspe*)
+      # SPE support was dropped in glibc 2.30.
+      # We can't use AC_MSG_ERROR here.
+      # The parent script is in the middle of printing the
+      # "checking for sysdeps preconfigure fragments" line.
+      echo >&2
+      echo "Host system type $host is no longer supported." >&2
+      exit 1
+    ;;
+  esac
   ;;
 esac