[llvm-bugs] [Bug 37575] New: sanitized build of clang does not work with thinlto

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37575

            Bug ID: 37575
           Summary: sanitized build of clang does not work with thinlto
           Product: compiler-rt
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: compiler-rt
          Assignee: unassignedbugs at nondot.org
          Reporter: hiraditya at msn.com
                CC: llvm-bugs at lists.llvm.org

Steps to repro:
1. Build clang with address sanitizer on.

cmake -DCMAKE_BUILD_TYPE:STRING=Debug
-DCMAKE_C_FLAGS_DEBUG:STRING=-g -fsanitize=address
-DCMAKE_CXX_FLAGS_DEBUG:STRING=-g -fsanitize=address


2. clang -flto=thin a.c b.c -Oz
==73085==ERROR: Interceptors are not working. This may be because
AddressSanitizer is loaded too late (e.g. via dlopen). Please launch the
executable with:
DYLD_INSERT_LIBRARIES=/Applications/Xcode_9.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.1.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib


$ cat a.c
void foo() {
}

$ cat b.c
void foo();
int main() {
  foo();
  return 0;
}

Even exporting the dylib before the launch does not work.
export
DYLD_INSERT_LIBRARIES=/Applications/Xcode_9.3.0.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.1.0/lib/darwin/libclang_rt.asan_osx_dynamic.dylib

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