[compiler-rt] c467e60 - Check if LLD is built when checking if lto_supported (#92752)

[via llvm-commits]

Author: Jan Voung
Date: 2024-06-07T09:29:31-07:00
New Revision: c467e6097e7332b65f9390e7088cb7ae0116a8bb

URL: https://github.com/llvm/llvm-project/commit/c467e6097e7332b65f9390e7088cb7ae0116a8bb
DIFF: https://github.com/llvm/llvm-project/commit/c467e6097e7332b65f9390e7088cb7ae0116a8bb.diff

LOG: Check if LLD is built when checking if lto_supported (#92752)

Otherwise, older copies of LLD may not understand the latest bitcode
versions (for example, if we increase
`ModuleSummaryIndex::BitCodeSummaryVersion`)

Related to
https://github.com/llvm/llvm-project/pull/90692#issuecomment-2113250317

Added: 
    

Modified: 
    compiler-rt/test/lit.common.cfg.py

Removed: 
    


################################################################################
diff  --git a/compiler-rt/test/lit.common.cfg.py b/compiler-rt/test/lit.common.cfg.py
index fae1d1686e569..64b9a9d025e7b 100644
--- a/compiler-rt/test/lit.common.cfg.py
+++ b/compiler-rt/test/lit.common.cfg.py
@@ -744,6 +744,13 @@ def is_binutils_lto_supported():
     return True
 
 
+def is_lld_lto_supported():
+    # LLD does support LTO, but we require it to be built with the latest
+    # changes to claim support. Otherwise older copies of LLD may not
+    # understand new bitcode versions.
+    return os.path.exists(os.path.join(config.llvm_tools_dir, "lld"))
+
+
 def is_windows_lto_supported():
     if not target_is_msvc:
         return True
@@ -755,7 +762,7 @@ def is_windows_lto_supported():
     config.lto_flags = ["-Wl,-lto_library," + liblto_path()]
 elif config.host_os in ["Linux", "FreeBSD", "NetBSD"]:
     config.lto_supported = False
-    if config.use_lld:
+    if config.use_lld and is_lld_lto_supported():
         config.lto_supported = True
     if is_binutils_lto_supported():
         config.available_features.add("binutils_lto")