configure: Default to 'cc', not 'gcc'

Default to 'cc' as our compiler, rather than 'gcc'. We used to have
to insist on gcc when we still kept the CPU env in a fixed global
register, but this is no longer necessary and we will now compile OK
on clang as well as gcc.  Using 'cc' should generally result in us
using the most standard and maintained system compiler for the
platform.  (For instance on newer MacOS X 'gcc' exists but is an
elderly compiler provided mostly for legacy reasons, and 'cc'
(which is clang) is definitely the better choice.) On Linux there
will generally be no user-visible change since cc will be gcc.

This changeover necessitates a slight reworking of how we set the
'cc' variable, because GNU cross toolchains generally provide a
'${cross_prefix}gcc' but not a '${cross_prefix}cc'.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

diff --git a/configure b/configure
index 44034d66b90f96f0cd00c0ca763e165e0ac0b2b0..e5aedef78800c9cb09a6dc65a6ce40dc9e26681a 100755 (executable)
--- a/configure
+++ b/configure
@@ -116,7 +116,7 @@ audio_drv_list=""
 audio_card_list="ac97 es1370 sb16 hda"
 audio_possible_cards="ac97 es1370 sb16 cs4231a adlib gus hda"
 block_drv_whitelist=""
-host_cc="gcc"
+host_cc="cc"
 libs_softmmu=""
 libs_tools=""
 audio_pt_int=""
@@ -250,7 +250,16 @@ done
 # Using uname is really, really broken.  Once we have the right set of checks
 # we can eliminate its usage altogether.
 
-cc="${CC-${cross_prefix}gcc}"
+# Preferred compiler:
+#  ${CC} (if set)
+#  ${cross_prefix}gcc (if cross-prefix specified)
+#  system compiler
+if test -z "${CC}${cross_prefix}"; then
+  cc="$host_cc"
+else
+  cc="${CC-${cross_prefix}gcc}"
+fi
+
 ar="${AR-${cross_prefix}ar}"
 objcopy="${OBJCOPY-${cross_prefix}objcopy}"
 ld="${LD-${cross_prefix}ld}"