brp-compile-lto-elf: Avoid a tmpdir

The mkdir -p was unused as far as I can see. The tmpdir was unnecessary,
since we can just pass -x to clang.

brp-llvm-compile-lto-elf

@@ -1,13 +1,12 @@
 #!/usr/bin/bash -eu
 
-CLANG_FLAGS=$@
 
 if [ -z "$RPM_BUILD_ROOT" ] || [ "$RPM_BUILD_ROOT" = "/" ]; then
 	exit 0
 fi
 
+CLANG_FLAGS=$@
 NCPUS=${RPM_BUILD_NCPUS:-1}
-TMPDIR=`mktemp -d`
 
 check_convert_bitcode () {
   local file_name=$(realpath ${1})
@@ -19,11 +18,8 @@ check_convert_bitcode () {
     llvm-bcanalyzer -dump ${file_name} | grep -xP '.*\-flto((?!-fno-lto).)*' 2>&1 > /dev/null
     if [ $? -eq 0 ]; then
       echo "Compiling LLVM bitcode file ${file_name}."
-      # create path to file in temp dir
-      # move file to temp dir with llvm .bc extension for clang
-      mkdir -p ${TMPDIR}/$(dirname ${file_name})
-      mv $file_name ${TMPDIR}/${file_name}.bc
-      clang -c ${CLANG_FLAGS} -fno-lto -Wno-unused-command-line-argument ${TMPDIR}/${file_name}.bc -o ${file_name}
+      clang ${CLANG_FLAGS} -fno-lto -Wno-unused-command-line-argument \
+        -x ir ${file_name} -c -o ${file_name}
     fi
   elif [[ "${file_type}" == *"current ar archive"* ]]; then
     echo "Unpacking ar archive ${file_name} to check for LLVM bitcode components."
@@ -42,7 +38,6 @@ check_convert_bitcode () {
 }
 
 echo "Checking for LLVM bitcode artifacts"
-
 export -f check_convert_bitcode
 find "$RPM_BUILD_ROOT" -type f -name "*.[ao]" -print0 | \
   xargs -0 -n1 -P$NCPUS sh -c "check_convert_bitcode \$@" ARG0