diff --git a/buildlib/azure-pipelines-pr.yml b/buildlib/azure-pipelines-pr.yml
index e27d2ad1698..b261931c5e9 100644
--- a/buildlib/azure-pipelines-pr.yml
+++ b/buildlib/azure-pipelines-pr.yml
@@ -131,7 +131,7 @@ stages:
 
       # Test RPM build
       - job: build_rpm
-        displayName: build tarball and source rpm
+        displayName: Build tarball and source rpm
         container: fedora
         steps:
           - checkout: self
@@ -144,8 +144,15 @@ stages:
               set -eE
               gcc --version
               ./contrib/configure-release
-              ./contrib/buildrpm.sh -s -t -b
-            displayName: Build tarball
+              stdbuf -e0 -o0 ./contrib/buildrpm.sh -s -t -b |& tee rpmbuild.log
+              pattern='^warning: '
+              if grep -q "$pattern" rpmbuild.log; then
+                echo "rpm build generated warnings:"
+                grep "$pattern" rpmbuild.log
+                echo "##vso[task.logissue type=error]rpm build generated warnings"
+                echo "##vso[task.complete result=Failed;]"
+              fi
+            displayName: Configure source and build RPM
 
   - stage: Tests
     dependsOn: [Codestyle]