fix some tests when running under QEMU

In some cases, ldd can fail on the original binary. In that case it is also observed that running with an explicit interpreter will fail.

https://gitlab.com/qemu-project/qemu/-/issues/1763

tests/replace-add-needed.sh

@@ -11,7 +11,15 @@ cp libbar.so "${SCRATCH}"/
 
 cd "${SCRATCH}"
 
-libcldd=$(ldd ./simple | awk '/ => / { print $3 }' | grep -E "(libc(-[0-9.]*)*.so|ld-musl)")
+# QEMU & ldd are not playing well together in certain cases
+if ldd ./simple >/dev/null 2>&1; then
+    libcldd=$(ldd ./simple | awk '/ => / { print $3 }' | grep -E "(libc(-[0-9.]*)*.so|ld-musl)")
+elif [ -f /lib64/libc.so.6 ]; then
+    libcldd=/lib64/libc.so.6
+else
+    echo "ldd ./simple failed"
+    exit 1
+fi
 
 # We have to set the soname on these libraries
 ${PATCHELF} --set-soname libbar.so ./libbar.so

tests/set-interpreter-long.sh

@@ -6,7 +6,8 @@ SCRATCH=scratch/$(basename "$0" .sh)
 oldInterpreter=$(../src/patchelf --print-interpreter ./simple)
 echo "current interpreter is $oldInterpreter"
 
-if test "$(uname)" = Linux; then
+# QEMU & ldd/ld.so are not playing well together in certain cases
+if test "$(uname)" = Linux && ldd ./simple >/dev/null 2>&1; then
     echo "running with explicit interpreter..."
     "$oldInterpreter" ./simple
 fi
@@ -28,7 +29,7 @@ echo "running with new interpreter..."
 ln -s "$oldInterpreter" "$newInterpreter"
 "${SCRATCH}"/simple
 
-if test "$(uname)" = Linux; then
+if test "$(uname)" = Linux && ldd ./simple >/dev/null 2>&1; then
     echo "running with explicit interpreter..."
     "$oldInterpreter" "${SCRATCH}/simple"
 fi