--- boost_1_55_0/tools/build/v2/tools/clang-linux.jam.back	2019-09-04 16:43:57.542806983 +0900
+++ boost_1_55_0/tools/build/v2/tools/clang-linux.jam	2019-09-04 16:45:23.451800016 +0900
@@ -152,7 +152,7 @@
 }
 
 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 * ) {
@@ -163,7 +163,7 @@
 
 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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