[SYCL][E2E] Add autodetection for build targets (#17141)

Based on the output of `clang++ --print-targets`

Author: ayylol

sycl/test-e2e/lit.cfg.py

@@ -525,6 +525,17 @@ def open_check_file(file_name):
 if not sycl_ls:
     lit_config.fatal("can't find `sycl-ls`")
 
+if (
+    len(config.sycl_build_targets) == 1
+    and next(iter(config.sycl_build_targets)) == "target-all"
+):
+    config.sycl_build_targets = {"target-spir"}
+    sp = subprocess.getstatusoutput(config.dpcpp_compiler + " --print-targets")
+    if "nvptx64" in sp[1]:
+        config.sycl_build_targets.add("target-nvidia")
+    if "amdgcn" in sp[1]:
+        config.sycl_build_targets.add("target-amd")
+
 if len(config.sycl_devices) == 1 and config.sycl_devices[0] == "all":
     devices = set()
     cmd = (

sycl/test-e2e/lit.site.cfg.py.in

@@ -30,7 +30,8 @@ config.igc_tag_file = os.path.join("/usr/local/lib/igc/", 'IGCTAG.txt')
 
 config.sycl_devices = lit_config.params.get("sycl_devices", "@SYCL_TEST_E2E_TARGETS@").split(';')
 
-config.sycl_build_targets = set("target-" + t for t in lit_config.params.get("sycl_build_targets", "spir").split(';'))
+config.sycl_build_targets = set("target-" + t for t in lit_config.params.get(
+    "sycl_build_targets", "all").split(';'))
 
 config.amd_arch = lit_config.params.get("amd_arch", "@AMD_ARCH@")
 config.sycl_threads_lib = '@SYCL_THREADS_LIB@'