[TAU package] Perfetto tracing variant (spack#2172)

* [TAU package] Perfetto tracing variant

* [@spackbot] updating style on behalf of jordialcaraz

---------

Co-authored-by: jordialcaraz <[email protected]>

Author: jordialcaraz

repos/spack_repo/builtin/packages/tau/package.py

@@ -147,6 +147,9 @@ class Tau(Package):
         description="Do not add -no-pie while linking with Ubuntu.",
     )
     variant("openacc", default=False, description="Activates OpenACC support")
+    variant(
+        "perfetto", default=True, description="Activates Perfetto tracing support", when="@2.35:"
+    )
     depends_on("c", type="build")  # generated
     depends_on("cxx", type="build")  # generated
     depends_on("fortran", type="build")  # generated
@@ -466,6 +469,9 @@ def install(self, spec, prefix):
             if "+elf" not in spec:
                 options.append("-elf=%s" % spec["elfutils"].prefix)
 
+        if "+perfetto" in spec:
+            options.append("-perfetto")
+
         compiler_specific_options = self.set_compiler_options(spec)
         options.extend(compiler_specific_options)
         configure(*options)