Index: compiler-rt/lib/tsan/CMakeLists.txt
===================================================================
--- compiler-rt/lib/tsan/CMakeLists.txt
+++ compiler-rt/lib/tsan/CMakeLists.txt
@@ -156,6 +156,7 @@
   set(BUILDGO_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/go/buildgo.sh)
   add_custom_target(GotsanRuntimeCheck
     COMMAND env "CC=${CMAKE_C_COMPILER} ${OSX_SYSROOT_FLAG}"
+            EXTRA_CFLAGS=${CMAKE_C_FLAGS}
             IN_TMPDIR=1 SILENT=1 ${BUILDGO_SCRIPT}
     DEPENDS tsan ${BUILDGO_SCRIPT}
     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/go
@@ -170,6 +171,7 @@
       set(BUILDGO_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/go/buildgo.sh)
       add_custom_target(GotsanRuntimeCheck
         COMMAND env "CC=${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}"
+                EXTRA_CFLAGS=${CMAKE_C_FLAGS}
                 IN_TMPDIR=1 SILENT=1 ${BUILDGO_SCRIPT}
         DEPENDS clang_rt.tsan-${arch} ${BUILDGO_SCRIPT}
         WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/go
@@ -181,6 +183,7 @@
       set(BUILDGO_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/go/buildgo.sh)
       add_custom_target(GotsanRuntimeCheck
 	COMMAND env "CC=${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}"
+                EXTRA_CFLAGS=${CMAKE_C_FLAGS}
 		IN_TMPDIR=1 SILENT=1 ${BUILDGO_SCRIPT}
 	DEPENDS clang_rt.tsan-${arch} ${BUILDGO_SCRIPT}
 	WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/go
@@ -192,6 +195,7 @@
       set(BUILDGO_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/go/buildgo.sh)
       add_custom_target(GotsanRuntimeCheck
 	COMMAND env "CC=${CMAKE_C_COMPILER} ${CMAKE_C_COMPILER_ARG1}"
+                EXTRA_CFLAGS=${CMAKE_C_FLAGS} 
 		IN_TMPDIR=1 SILENT=1 ${BUILDGO_SCRIPT}
 	DEPENDS clang_rt.tsan-${arch} ${BUILDGO_SCRIPT}
 	WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/go
Index: compiler-rt/lib/tsan/go/buildgo.sh
===================================================================
--- compiler-rt/lib/tsan/go/buildgo.sh
+++ compiler-rt/lib/tsan/go/buildgo.sh
@@ -171,7 +171,7 @@
 	cat $F >> $DIR/gotsan.cpp
 done
 
-FLAGS=" -I../rtl -I../.. -I../../sanitizer_common -I../../../include -std=c++14 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO=1 -DSANITIZER_DEADLOCK_DETECTOR_VERSION=2 $OSCFLAGS $ARCHCFLAGS"
+FLAGS="-I../rtl -I../.. -I../../sanitizer_common -I../../../include -std=c++14 -Wall -fno-exceptions -fno-rtti -DSANITIZER_GO=1 -DSANITIZER_DEADLOCK_DETECTOR_VERSION=2 $OSCFLAGS $ARCHCFLAGS $EXTRA_CFLAGS"
 DEBUG_FLAGS="$FLAGS -DSANITIZER_DEBUG=1 -g"
 FLAGS="$FLAGS -DSANITIZER_DEBUG=0 -O3 -fomit-frame-pointer"
 if [ "$SUFFIX" = "linux_ppc64le" ]; then