configure: Distinguish ppc64 and ppc64le hosts

We cannot use the ppc64le host compiler to build ppc64(be) guest code.
Clean up confusion between cross_cc_powerpc and cross_cc_ppc; make use
of the cflags variable as well.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20190501223819.8584-2-richard.henderson@linaro.org>
[dwg: Dropped hunk relating to ppc64abi32, it doesn't test properly]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

configure

@@ -198,7 +198,7 @@ supported_kvm_target() {
         i386:i386 | i386:x86_64 | i386:x32 | \
         x86_64:i386 | x86_64:x86_64 | x86_64:x32 | \
         mips:mips | mipsel:mips | \
-        ppc:ppc | ppc64:ppc | ppc:ppc64 | ppc64:ppc64 | \
+        ppc:ppc | ppc64:ppc | ppc:ppc64 | ppc64:ppc64 | ppc64:ppc64le | \
         s390x:s390x)
             return 0
         ;;
@@ -502,8 +502,11 @@ cross_cc_arm="arm-linux-gnueabihf-gcc"
 cross_cc_cflags_armeb="-mbig-endian"
 cross_cc_i386="i386-pc-linux-gnu-gcc"
 cross_cc_cflags_i386=""
-cross_cc_powerpc="powerpc-linux-gnu-gcc"
-cross_cc_powerpc="powerpc-linux-gnu-gcc"
+cross_cc_ppc="powerpc-linux-gnu-gcc"
+cross_cc_cflags_ppc="-m32"
+cross_cc_ppc64="powerpc-linux-gnu-gcc"
+cross_cc_cflags_ppc64="-m64"
+cross_cc_ppc64le="powerpc64le-linux-gnu-gcc"
 
 enabled_cross_compilers=""
 
@@ -700,7 +703,11 @@ elif check_define __sparc__ ; then
   fi
 elif check_define _ARCH_PPC ; then
   if check_define _ARCH_PPC64 ; then
-    cpu="ppc64"
+    if check_define _LITTLE_ENDIAN ; then
+      cpu="ppc64le"
+    else
+      cpu="ppc64"
+    fi
   else
     cpu="ppc"
   fi
@@ -731,10 +738,14 @@ ARCH=
 # Note that this case should only have supported host CPUs, not guests.
 case "$cpu" in
   ppc|ppc64|s390|s390x|sparc64|x32|riscv32|riscv64)
-    cpu="$cpu"
     supported_cpu="yes"
     eval "cross_cc_${cpu}=\$host_cc"
   ;;
+  ppc64le)
+    ARCH="ppc64"
+    supported_cpu="yes"
+    cross_cc_ppc64le=$host_cc
+  ;;
   i386|i486|i586|i686|i86pc|BePC)
     cpu="i386"
     supported_cpu="yes"
@@ -1538,8 +1549,8 @@ case "$cpu" in
     ppc)
            CPU_CFLAGS="-m32"
            LDFLAGS="-m32 $LDFLAGS"
-           cross_cc_powerpc=$cc
-           cross_cc_cflags_powerpc=$CPU_CFLAGS
+           cross_cc_ppc=$cc
+           cross_cc_cflags_ppc="$CPU_CFLAGS"
            ;;
     ppc64)
            CPU_CFLAGS="-m64"
@@ -6191,7 +6202,7 @@ if { test "$cpu" = "i386" || test "$cpu" = "x86_64"; } && \
         fi
     done
 fi
-if test "$cpu" = "ppc64" && test "$targetos" != "Darwin" ; then
+if test "$ARCH" = "ppc64" && test "$targetos" != "Darwin" ; then
   roms="$roms spapr-rtas"
 fi
 
@@ -7378,7 +7389,7 @@ if test "$linux" = "yes" ; then
   i386|x86_64|x32)
     linux_arch=x86
     ;;
-  ppc|ppc64)
+  ppc|ppc64|ppc64le)
     linux_arch=powerpc
     ;;
   s390x)
@@ -7539,7 +7550,8 @@ case "$target_name" in
   ;;
   ppc)
     gdb_xml_files="power-core.xml power-fpu.xml power-altivec.xml power-spe.xml"
-    target_compiler=$cross_cc_powerpc
+    target_compiler=$cross_cc_ppc
+    target_compiler_cflags="$cross_cc_cflags_ppc"
   ;;
   ppc64)
     TARGET_BASE_ARCH=ppc
@@ -7547,6 +7559,7 @@ case "$target_name" in
     mttcg=yes
     gdb_xml_files="power64-core.xml power-fpu.xml power-altivec.xml power-spe.xml power-vsx.xml"
     target_compiler=$cross_cc_ppc64
+    target_compiler_cflags="$cross_cc_cflags_ppc64"
   ;;
   ppc64le)
     TARGET_ARCH=ppc64