configure: Put temporary directory in build tree, and delete it

We were putting the temporary directory we use for configure tests
under /tmp/, but never deleting it, so if you ran configure a lot
you'd build up a big stock of useless directories.

Switch to using a scheme like GNU autotools and QEMU, where we
put the configure tempdir in the build tree, and delete it
just when configure exits successfully.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 16 insertions, 1 deletions

diff --git a/configure b/configure
index 1fbc27c..055e6d6 100755
--- a/configure
+++ b/configure
@@ -13,7 +13,20 @@
 # Locate the directory where this configure script is
 SRCDIR="$(cd "$(dirname "$0")"; pwd)"
 
-tmp_dir=`mktemp -d -t risu_configure_check_XXXXXX`
+# Temporary directory used for files created by this script.
+# Like autoconf (and like QEMU) we put this directory in the
+# build directory, which means we can just give it a fixed name and
+# blow it away when configure is run, and we don't need to jump
+# through complicated hoops to delete it when configure exits
+# abnormally (it may be useful for debug purposes on an
+# abnormal exit).
+tmp_dir="config-temp"
+rm -rf "$tmp_dir"
+mkdir -p "$tmp_dir"
+if [ $? -ne 0 ]; then
+    echo "ERROR: could not create temporary directory"
+    exit 1
+fi
 
 compile() {
     $CC $CFLAGS -c -o ${1}.o ${1}.c 2>/dev/null
@@ -125,6 +138,8 @@ if test ! -e Makefile; then
     ln -s "${SRCDIR}/Makefile" .
 fi
 
+rm -r "$tmp_dir"
+
 echo "type 'make' to start the build"
 exit 0