[clang][Driver] Pass /INFERASANLIBS:NO to link.exe under -fsanitize=address

With recent MSVC releases, STL headers will add /INFERASANLIBS to the drectve section of object files that are compiled with clang. With this flag, link.exe will automatically attempt to look for asan libs.

When using clang as the driver to invoke the linker, we want to disable this feature because we explicitly pass the proper asan libraries, otherwise we get symbols defined multiple times.

Reviewed By: hans

Differential Revision: https://reviews.llvm.org/D144684

diff --git a/clang/lib/Driver/ToolChains/MSVC.cpp b/clang/lib/Driver/ToolChains/MSVC.cpp
index 13a7a2f..6f7db52 100644 (file)
--- a/clang/lib/Driver/ToolChains/MSVC.cpp
+++ b/clang/lib/Driver/ToolChains/MSVC.cpp
@@ -336,6 +336,11 @@ void visualstudio::Linker::ConstructJob(Compilation &C, const JobAction &JA,
       }
     }
 
+    // Clang handles passing the proper asan libs to the linker, which goes
+    // against link.exe's /INFERASANLIBS which automatically finds asan libs.
+    if (TC.getSanitizerArgs(Args).needsAsanRt())
+      CmdArgs.push_back("/INFERASANLIBS:NO");
+
 #ifdef _WIN32
     // When cross-compiling with VS2017 or newer, link.exe expects to have
     // its containing bin directory at the top of PATH, followed by the

diff --git a/clang/test/Driver/cl-link.c b/clang/test/Driver/cl-link.c
index dcb7801..21d8208 100644 (file)
--- a/clang/test/Driver/cl-link.c
+++ b/clang/test/Driver/cl-link.c
@@ -65,3 +65,11 @@
 
 // RUN: %clang_cl /Tc%s -fuse-ld=lld -### 2>&1 | FileCheck --check-prefix=USE_LLD %s
 // USE_LLD: lld-link
+
+// RUN: %clang_cl -m32 -arch:IA32 --target=i386-pc-win32 /Tc%s -fuse-ld=link -### -fsanitize=address 2>&1 | FileCheck --check-prefix=INFER-LINK %s
+// INFER-LINK: link.exe
+// INFER-LINK: /INFERASANLIBS:NO
+
+// RUN: %clang_cl -m32 -arch:IA32 --target=i386-pc-win32 /Tc%s -fuse-ld=lld -### -fsanitize=address 2>&1 | FileCheck --check-prefix=INFER-LLD %s
+// INFER-LLD: lld-link
+// INFER-LLD-NOT: INFERASANLIBS