diff --git a/swift/utils/swift_build_support/swift_build_support/products/cmark.py b/swift/utils/swift_build_support/swift_build_support/products/cmark.py
index b11313fab87..fe2e8982300 100644
--- a/swift/utils/swift_build_support/swift_build_support/products/cmark.py
+++ b/swift/utils/swift_build_support/swift_build_support/products/cmark.py
@@ -12,6 +12,9 @@
 
 from . import cmake_product
 from . import earlyswiftdriver
+from ..host_specific_configuration \
+    import HostSpecificConfiguration
+import os
 
 
 class CMark(cmake_product.CMakeProduct):
@@ -68,6 +70,13 @@ class CMark(cmake_product.CMakeProduct):
             toolchain_file = self.generate_linux_toolchain_file(platform, arch)
             self.cmake_options.define('CMAKE_TOOLCHAIN_FILE:PATH', toolchain_file)
 
+        host_config = HostSpecificConfiguration(host_target, self.args)
+        self.cmake_options.extend(host_config.cmake_options)
+
+        if 'ANDROID_DATA' not in os.environ:
+            self.cmake_options.define('CMAKE_C_FLAGS', '%s --target=%s %s' % (os.environ.get('CFLAGS'), os.environ.get('CCTERMUX_HOST_PLATFORM'), os.environ.get('CPPFLAGS')))
+            self.cmake_options.define('CMAKE_CXX_FLAGS', '%s --target=%s %s' % (os.environ.get('CXXFLAGS'), os.environ.get('CCTERMUX_HOST_PLATFORM'), os.environ.get('CPPFLAGS')))
+
         self.build_with_cmake(["all"], self.args.cmark_build_variant, [])
 
     def should_test(self, host_target):
diff --git a/swift/utils/swift_build_support/swift_build_support/products/llvm.py b/swift/utils/swift_build_support/swift_build_support/products/llvm.py
index 744dca10fca..7b5932882f2 100644
--- a/swift/utils/swift_build_support/swift_build_support/products/llvm.py
+++ b/swift/utils/swift_build_support/swift_build_support/products/llvm.py
@@ -340,6 +340,12 @@ class LLVM(cmake_product.CMakeProduct):
             llvm_cmake_options.define('CLANG_TABLEGEN', clang_tblgen)
             llvm = os.path.join(host_build_dir, 'llvm')
             llvm_cmake_options.define('LLVM_NATIVE_BUILD', llvm)
+            llvm_cmake_options.define('CMAKE_CXX_FLAGS', '{} --target={} {}'.format(os.environ['CXXFLAGS'], os.environ['CCTERMUX_HOST_PLATFORM'], os.environ['CPPFLAGS']))
+            llvm_cmake_options.define('CMAKE_EXE_LINKER_FLAGS', '{} --target={}'.format(os.environ['LDFLAGS'], os.environ['CCTERMUX_HOST_PLATFORM']))
+            llvm_cmake_options.define('CMAKE_FIND_ROOT_PATH:PATH', self.args.cross_compile_deps_path)
+            llvm_cmake_options.define('CMAKE_FIND_ROOT_PATH_MODE_PROGRAM', 'NEVER')
+            llvm_cmake_options.define('CMAKE_FIND_ROOT_PATH_MODE_LIBRARY', 'ONLY')
+
 
         host_config = HostSpecificConfiguration(host_target, self.args)