diff --git a/toolchain/apple/toolchain.gni b/toolchain/apple/toolchain.gni
index dd2722015..f6b7a4486 100644
--- a/toolchain/apple/toolchain.gni
+++ b/toolchain/apple/toolchain.gni
@@ -470,7 +470,7 @@ template("single_apple_toolchain") {
     tool("cxx") {
       depfile = "{{output}}.d"
       precompiled_header_type = "gcc"
-      command = "$coverage_wrapper$cxx $md -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} {{module_deps_no_self}} -c {{source}} -o {{output}}"
+      command = "$coverage_wrapper$cxx $md -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "CXX {{output}}"
       outputs = [ "$object_subdir/{{source_name_part}}.o" ]
@@ -482,7 +482,7 @@ template("single_apple_toolchain") {
 
       # Module file doesn't need coverage instrumentation because module files
       # represent interfaces rather than implementations.
-      command = "$cxx -MD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} {{module_deps_no_self}} -fmodule-name={{cc_module_name}} -c -x c++ -Xclang -emit-module {{source}} -o {{output}}"
+      command = "this-should-never-run"
       depsformat = "gcc"
       description = "CXX_MODULE {{output}}"
       outputs = [ "$object_subdir/{{source_name_part}}.pcm" ]
diff --git a/toolchain/gcc_toolchain.gni b/toolchain/gcc_toolchain.gni
index a22678bb1..eb5db24c9 100644
--- a/toolchain/gcc_toolchain.gni
+++ b/toolchain/gcc_toolchain.gni
@@ -332,7 +332,7 @@ template("single_gcc_toolchain") {
     tool("cxx") {
       depfile = "{{output}}.d"
       precompiled_header_type = "gcc"
-      command = "$coverage_wrapper$cxx $md -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}${extra_cppflags}${extra_cxxflags} {{module_deps_no_self}} -c {{source}} -o {{output}}"
+      command = "$coverage_wrapper$cxx $md -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}${extra_cppflags}${extra_cxxflags} -c {{source}} -o {{output}}"
       depsformat = "gcc"
       description = "CXX {{output}}"
       outputs = [ "$object_subdir/{{source_name_part}}.o" ]
@@ -343,7 +343,7 @@ template("single_gcc_toolchain") {
 
       # Module file doesn't need coverage instrumentation because module files
       # represent interfaces rather than implementations.
-      command = "$cxx -MD -MF $depfile {{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}}${extra_cppflags}${extra_cxxflags} {{module_deps_no_self}} -fmodule-name={{cc_module_name}} -x c++ -Xclang -emit-module -c {{source}} -o {{output}}"
+      command = "this-should-never-run"
       depsformat = "gcc"
       description = "CXX_MODULE {{output}}"
       outputs = [ "$object_subdir/{{source_name_part}}.pcm" ]
diff --git a/toolchain/win/toolchain.gni b/toolchain/win/toolchain.gni
index 8d0b87816..dbefdda0b 100644
--- a/toolchain/win/toolchain.gni
+++ b/toolchain/win/toolchain.gni
@@ -239,7 +239,7 @@ template("msvc_toolchain") {
       depsformat = "msvc"
       description = "CXX_MODULE {{output}}"
       outputs = [ "$object_subdir/{{source_name_part}}.pcm" ]
-      command = "$env_wrapper$cl /Fo{{output}} /nologo $show_includes $sys_include_flags{{defines}} {{include_dirs}} {{cflags}} {{cflags_cc}} {{module_deps_no_self}} /Fd\"$pdbname\" -fmodule-name={{cc_module_name}} /c -x c++ -Xclang -emit-module {{source}}"
+      command = "this-should-never-run"
     }
 
     tool("cxx") {
@@ -255,7 +255,7 @@ template("msvc_toolchain") {
 
       # Note that the code coverage wrapper scripts assumes that {{source}}
       # comes immediately after /c.
-      command = "$coverage_wrapper$env_wrapper$cl /c {{source}} /Fo{{output}} /nologo $show_includes $sys_include_flags{{defines}} {{include_dirs}} {{cflags}} /TP {{cflags_cc}} {{module_deps_no_self}} /Fd\"$pdbname\""
+      command = "$coverage_wrapper$env_wrapper$cl /c {{source}} /Fo{{output}} /nologo $show_includes $sys_include_flags{{defines}} {{include_dirs}} {{cflags}} /TP {{cflags_cc}} /Fd\"$pdbname\""
     }
 
     tool("rc") {