From c08b2da1db9c08e128b661be58e81251b7df3d6b Mon Sep 17 00:00:00 2001
From: Axel Naumann <Axel.Naumann@cern.ch>
Date: Tue, 27 Apr 2021 18:48:56 +0200
Subject: [PATCH] [core] Deprecate !(ACLiC.LinkLibs & 1). Remove ancient macOS
 case.

---
 core/base/src/TSystem.cxx | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/core/base/src/TSystem.cxx b/core/base/src/TSystem.cxx
index 817608fd174d35..efcbf6759768ac 100644
--- a/core/base/src/TSystem.cxx
+++ b/core/base/src/TSystem.cxx
@@ -3317,15 +3317,17 @@ int TSystem::CompileMacro(const char *filename, Option_t *opt,
 #endif
    Bool_t linkDepLibraries = !produceRootmap;
    if (gEnv) {
-#if (defined(R__MACOSX) && !defined(MAC_OS_X_VERSION_10_5))
-      Int_t linkLibs = gEnv->GetValue("ACLiC.LinkLibs",2);
-#elif defined(R__WIN32)
+#if defined(R__WIN32)
       Int_t linkLibs = gEnv->GetValue("ACLiC.LinkLibs",3);
 #else
       Int_t linkLibs = gEnv->GetValue("ACLiC.LinkLibs",1);
 #endif
       produceRootmap = linkLibs & 0x2;
       linkDepLibraries = linkLibs & 0x1;
+      if (!linkDepLibraries) {
+         static int onetime = (Warning("ACLiC", "Unsetting `ACLiC.LinkLibs & 1` is deprecated!"), 1);
+         (void)onetime;
+      }
    }
 
    // FIXME: Triggers clang false positive warning -Wunused-lambda-capture.