configure: support target dependent linking

This patch is the first attempt to make configure more intelligent with
regard to how it links to libraries. It divides the softmmu libraries into
two lists, a general one and a list which depends on the target
architecture.
Signed-off-by: NMichael Walle <michael@walle.cc>
Reviewed-by: NAurelien Jarno <aurelien@aurel32.net>
Acked-by: NEdgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

configure

@@ -1946,11 +1946,11 @@ int main(void) { return 0; }
 EOF
   if compile_prog "" "$fdt_libs" ; then
     fdt=yes
-    libs_softmmu="$fdt_libs $libs_softmmu"
   else
     if test "$fdt" = "yes" ; then
       feature_not_found "fdt"
     fi
+    fdt_libs=
     fdt=no
   fi
 fi
@@ -1967,11 +1967,11 @@ int main(void) { GL_VERSION; return 0; }
 EOF
   if compile_prog "" "-lGL" ; then
     opengl=yes
-       libs_softmmu="$opengl_libs $libs_softmmu"
   else
     if test "$opengl" = "yes" ; then
       feature_not_found "opengl"
     fi
+    opengl_libs=
     opengl=no
   fi
 fi
@@ -3079,6 +3079,7 @@ target_short_alignment=2
 target_int_alignment=4
 target_long_alignment=4
 target_llong_alignment=8
+target_libs_softmmu=
 
 TARGET_ARCH="$target_arch2"
 TARGET_BASE_ARCH=""
@@ -3112,6 +3113,7 @@ case "$target_arch2" in
   ;;
   lm32)
     target_phys_bits=32
+    target_libs_softmmu="$opengl_libs"
   ;;
   m68k)
     bflt="yes"
@@ -3126,6 +3128,7 @@ case "$target_arch2" in
     bflt="yes"
     target_nptl="yes"
     target_phys_bits=32
+    target_libs_softmmu="$fdt_libs"
   ;;
   mips|mipsel)
     TARGET_ARCH=mips
@@ -3150,6 +3153,7 @@ case "$target_arch2" in
     gdb_xml_files="power-core.xml power-fpu.xml power-altivec.xml power-spe.xml"
     target_phys_bits=32
     target_nptl="yes"
+    target_libs_softmmu="$fdt_libs"
   ;;
   ppcemb)
     TARGET_BASE_ARCH=ppc
@@ -3157,6 +3161,7 @@ case "$target_arch2" in
     gdb_xml_files="power-core.xml power-fpu.xml power-altivec.xml power-spe.xml"
     target_phys_bits=64
     target_nptl="yes"
+    target_libs_softmmu="$fdt_libs"
   ;;
   ppc64)
     TARGET_BASE_ARCH=ppc
@@ -3164,6 +3169,7 @@ case "$target_arch2" in
     gdb_xml_files="power64-core.xml power-fpu.xml power-altivec.xml power-spe.xml"
     target_phys_bits=64
     target_long_alignment=8
+    target_libs_softmmu="$fdt_libs"
   ;;
   ppc64abi32)
     TARGET_ARCH=ppc64
@@ -3172,6 +3178,7 @@ case "$target_arch2" in
     echo "TARGET_ABI32=y" >> $config_target_mak
     gdb_xml_files="power64-core.xml power-fpu.xml power-altivec.xml power-spe.xml"
     target_phys_bits=64
+    target_libs_softmmu="$fdt_libs"
   ;;
   sh4|sh4eb)
     TARGET_ARCH=sh4
@@ -3257,7 +3264,7 @@ fi
 if test "$target_softmmu" = "yes" ; then
   echo "TARGET_PHYS_ADDR_BITS=$target_phys_bits" >> $config_target_mak
   echo "CONFIG_SOFTMMU=y" >> $config_target_mak
-  echo "LIBS+=$libs_softmmu" >> $config_target_mak
+  echo "LIBS+=$libs_softmmu $target_libs_softmmu" >> $config_target_mak
   echo "HWDIR=../libhw$target_phys_bits" >> $config_target_mak
   echo "subdir-$target: subdir-libhw$target_phys_bits" >> $config_host_mak
 fi