[RFC PATCH 1/3] configure: don't override the selected host test compiler if defined

["Alex Bennée" <alex.bennee@linaro.org>]

There are not many cases you would want to do this but one is if you
want to use a test friendly compiler like gcc instead of a system
compiler like clang. Either way we should honour the users choice if
they have made it.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Warner Losh <imp@bsdimp.com>
---
 configure | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 9a79a004d7..eadc434144 100755
--- a/configure
+++ b/configure
@@ -1691,8 +1691,11 @@ case "$cpu" in
     # No special flags required for other host CPUs
 esac
 
-eval "cross_cc_${cpu}=\$cc"
-cross_cc_vars="$cross_cc_vars cross_cc_${cpu}"
+if eval test -z "\${cross_cc_$cpu}"; then
+    eval "cross_cc_${cpu}=\$cc"
+    cross_cc_vars="$cross_cc_vars cross_cc_${cpu}"
+fi
+
 QEMU_CFLAGS="$CPU_CFLAGS $QEMU_CFLAGS"
 
 # For user-mode emulation the host arch has to be one we explicitly
-- 
2.30.2