--- boost_1_63_0/tools/build/src/tools/clang-linux.jam.back	2019-09-04 15:51:25.052324575 +0900
+++ boost_1_63_0/tools/build/src/tools/clang-linux.jam	2019-09-04 15:52:22.278328007 +0900
@@ -153,7 +153,7 @@
 }
 
 actions compile.c++.pch {
-  rm -f "$(<)" && "$(CONFIG_COMMAND)" -x c++-header $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -Xclang -emit-pth -o "$(<)" "$(>)"
+  rm -f "$(<)" && "$(CONFIG_COMMAND)" -c -x c++-header $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -Xclang -emit-pth -o "$(<)" "$(>)"
 }
 
 rule compile.c.pch ( targets * : sources * : properties * ) {
@@ -164,7 +164,7 @@
 
 actions compile.c.pch
 {
-  rm -f "$(<)" && "$(CONFIG_COMMAND)" -x c-header $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -Xclang -emit-pth -o "$(<)" "$(>)"
+  rm -f "$(<)" && "$(CONFIG_COMMAND)" -c -x c-header $(OPTIONS) $(USER_OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -Xclang -emit-pth -o "$(<)" "$(>)"
 }
 
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