diff --git a/compiler-rt/lib/profile/CMakeLists.txt b/compiler-rt/lib/profile/CMakeLists.txt
--- a/compiler-rt/lib/profile/CMakeLists.txt
+++ b/compiler-rt/lib/profile/CMakeLists.txt
@@ -114,9 +114,6 @@
 append_list_if(COMPILER_RT_HAS_NOSTDINCXX_FLAG -nostdinc++ EXTRA_FLAGS)
 # XRay uses C++ standard library headers.
 string(REGEX REPLACE "-stdlib=[a-zA-Z+]*" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
-# The Windows specific code uses a #pragma comment(linker, ...) which requires
-# -fms-extensions on MinGW targets.
-append_list_if(MINGW -fms-extensions EXTRA_FLAGS)
 
 # This appears to be a C-only warning banning the use of locals in aggregate
 # initializers. All other compilers accept this, though.
diff --git a/compiler-rt/lib/profile/InstrProfilingFile.c b/compiler-rt/lib/profile/InstrProfilingFile.c
--- a/compiler-rt/lib/profile/InstrProfilingFile.c
+++ b/compiler-rt/lib/profile/InstrProfilingFile.c
@@ -109,7 +109,7 @@
 
 /* This variable is a weak external reference which could be used to detect
  * whether or not the compiler defined this symbol. */
-#if defined(_WIN32)
+#if defined(_MSC_VER)
 COMPILER_RT_VISIBILITY extern intptr_t INSTR_PROF_PROFILE_COUNTER_BIAS_VAR;
 #if defined(_M_IX86) || defined(__i386__)
 #define WIN_SYM_PREFIX "_"