[PATCH] D19170: [safestack] Link SafeStack runtime only when not using separate stack segment

[Michael LeMay via cfe-commits]

mlemay-intel updated this revision to Diff 76636.
mlemay-intel added a comment.

Disabled linking of the compiler-rt SafeStack runtime library for musl
environments rather than for targets that use the separate stack segment
feature.  This reflects changes in my proposed musl libc patches to add
architecture-independent support for storing USP in the TCB.


https://reviews.llvm.org/D19170

Files:
  lib/Driver/Tools.cpp
  test/Driver/sanitizer-ld.c


Index: test/Driver/sanitizer-ld.c
===================================================================
--- test/Driver/sanitizer-ld.c
+++ test/Driver/sanitizer-ld.c
@@ -406,6 +406,22 @@
 // CHECK-SAFESTACK-LINUX: "-lpthread"
 // CHECK-SAFESTACK-LINUX: "-ldl"
 
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     -target i386-unknown-linux-musl -fsanitize=safe-stack \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-SAFESTACK-MUSL32 %s
+//
+// CHECK-SAFESTACK-MUSL32: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
+// CHECK-SAFESTACK-MUSL32-NOT: libclang_rt.safestack-i386.a"
+
+// RUN: %clang -no-canonical-prefixes %s -### -o %t.o 2>&1 \
+// RUN:     -target x86_64-unknown-linux-musl -fsanitize=safe-stack \
+// RUN:     --sysroot=%S/Inputs/basic_linux_tree \
+// RUN:   | FileCheck --check-prefix=CHECK-SAFESTACK-MUSL64 %s
+//
+// CHECK-SAFESTACK-MUSL64: "{{(.*[^-.0-9A-Z_a-z])?}}ld{{(.exe)?}}"
+// CHECK-SAFESTACK-MUSL64-NOT: libclang_rt.safestack-x86_64.a"
+
 // RUN: %clang -fsanitize=cfi -fsanitize-stats %s -### -o %t.o 2>&1 \
 // RUN:     -target x86_64-unknown-linux \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp
+++ lib/Driver/Tools.cpp
@@ -3254,7 +3254,7 @@
     if (SanArgs.linkCXXRuntimes())
       StaticRuntimes.push_back("ubsan_standalone_cxx");
   }
-  if (SanArgs.needsSafeStackRt())
+  if (SanArgs.needsSafeStackRt() && !TC.getTriple().isMusl())
     StaticRuntimes.push_back("safestack");
   if (SanArgs.needsCfiRt())
     StaticRuntimes.push_back("cfi");


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