DAOS-17259 build: Support gcov builds

vars/sconsBuild.groovy

@@ -69,6 +69,7 @@ Map call(Map config = [:]) {
    *   <target-compiler[-build_type]-test>.  Additional stashes
    *   will be created for "install" and "build_vars" with similar
    *   prefixes.
+   * config['code_coverage'] Boolean, build with code coverage. Default false.
    */
 
     Date startDate = new Date()
@@ -192,6 +193,9 @@ Map call(Map config = [:]) {
     if (config['WARNING_LEVEL']) {
         scons_args += " WARNING_LEVEL=${config['WARNING_LEVEL']}"
     }
+    if (config['code_coverage']) {
+        scons_args += ' --code-coverage'
+    }
     //scons -c is not perfect so get out the big hammer
     String clean_cmd = ""
     if (config['skip_clean']) {
@@ -315,6 +319,9 @@ Map call(Map config = [:]) {
         if (stage_info['compiler'] == 'covc') {
             vars_includes += ', test.cov'
         }
+        if (config['code_coverage']) {
+            vars_includes += ', build/**/*.gcno'
+        }
         stash name: target_stash + '-build-vars',
               includes: vars_includes
         String test_files = readFile "${env.WORKSPACE}/${config['stash_files']}"

vars/unitTest.groovy

@@ -223,5 +223,11 @@ Map call(Map config = [:]) {
     stash name: results_map,
           includes: results_map
 
+    // Stash any optional test coverage rreports for the stage
+    String code_coverage = 'code_coverage_' + sanitizedStageName()
+    stash name: code_coverage,
+          includes: '**/code_coverage.json',
+          allowEmpty: true
+
     return runData
 }