diff --git a/internal/build/build.go b/internal/build/build.go
index 654b3746..44b01134 100644
--- a/internal/build/build.go
+++ b/internal/build/build.go
@@ -953,6 +953,13 @@ func clFiles(ctx *context, files string, pkg *packages.Package, procFile func(li
 
 func clFile(ctx *context, args []string, cFile, expFile string, procFile func(linkFile string), verbose bool) {
 	llFile := expFile + filepath.Base(cFile) + ".ll"
+	ext := filepath.Ext(cFile)
+
+	// default clang++ will use c++ to compile c file,will cause symbol be mangled
+	if ext == ".c" {
+		args = append(args, "-x", "c")
+	}
+
 	args = append(args, "-emit-llvm", "-S", "-o", llFile, "-c", cFile)
 	args = append(args, ctx.crossCompile.CCFLAGS...)
 	args = append(args, ctx.crossCompile.CFLAGS...)
diff --git a/runtime/internal/clite/bitcast/_cast/cast.cpp b/runtime/internal/clite/bitcast/_cast/cast.c
similarity index 95%
rename from runtime/internal/clite/bitcast/_cast/cast.cpp
rename to runtime/internal/clite/bitcast/_cast/cast.c
index 8c5b12a1..ea567ce5 100644
--- a/runtime/internal/clite/bitcast/_cast/cast.cpp
+++ b/runtime/internal/clite/bitcast/_cast/cast.c
@@ -6,8 +6,6 @@ typedef union
     long long ll;
 } castUnion;
 
-extern "C" { 
-
 double llgoToFloat64(long long v)
 {
     castUnion k;
@@ -35,5 +33,3 @@ int llgoFromFloat32(float v)
     k.f = v;
     return k.v;
 }
-
-}
diff --git a/runtime/internal/clite/bitcast/bitcast.go b/runtime/internal/clite/bitcast/bitcast.go
index 07a79515..3fa7f6fa 100644
--- a/runtime/internal/clite/bitcast/bitcast.go
+++ b/runtime/internal/clite/bitcast/bitcast.go
@@ -19,7 +19,7 @@ package bitcast
 import _ "unsafe"
 
 const (
-	LLGoFiles   = "_cast/cast.cpp"
+	LLGoFiles   = "_cast/cast.c"
 	LLGoPackage = "link"
 )
 
diff --git a/runtime/internal/clite/debug/_wrap/debug.cpp b/runtime/internal/clite/debug/_wrap/debug.c
similarity index 98%
rename from runtime/internal/clite/debug/_wrap/debug.cpp
rename to runtime/internal/clite/debug/_wrap/debug.c
index 64d2a846..32d87903 100644
--- a/runtime/internal/clite/debug/_wrap/debug.cpp
+++ b/runtime/internal/clite/debug/_wrap/debug.c
@@ -9,8 +9,6 @@
 #include <dlfcn.h>
 #include <libunwind.h>
 
-extern "C" {
-
 void *llgo_address() {
     return __builtin_return_address(0);
 }
@@ -40,6 +38,4 @@ void llgo_stacktrace(int skip, void *ctx, int (*fn)(void *ctx, void *pc, void *o
             }
         }
     }
-}
-
-}
+}
\ No newline at end of file
diff --git a/runtime/internal/clite/debug/debug.go b/runtime/internal/clite/debug/debug.go
index 5aa793f2..7a1efc4d 100644
--- a/runtime/internal/clite/debug/debug.go
+++ b/runtime/internal/clite/debug/debug.go
@@ -9,7 +9,7 @@ import (
 )
 
 const (
-	LLGoFiles = "$(llvm-config --cflags): _wrap/debug.cpp"
+	LLGoFiles = "$(llvm-config --cflags): _wrap/debug.c"
 )
 
 type Info struct {
diff --git a/runtime/internal/clite/ffi/_wrap/libffi.cpp b/runtime/internal/clite/ffi/_wrap/libffi.c
similarity index 87%
rename from runtime/internal/clite/ffi/_wrap/libffi.cpp
rename to runtime/internal/clite/ffi/_wrap/libffi.c
index 59b4cfd8..53fa1c70 100644
--- a/runtime/internal/clite/ffi/_wrap/libffi.cpp
+++ b/runtime/internal/clite/ffi/_wrap/libffi.c
@@ -1,9 +1,5 @@
 #include <ffi.h>
 
-extern "C" {
-
 void *llog_ffi_closure_alloc(void **code) {
     return ffi_closure_alloc(sizeof(ffi_closure), code);
 }
-
-}
diff --git a/runtime/internal/clite/ffi/ffi_other.go b/runtime/internal/clite/ffi/ffi_other.go
index 06fef2f3..6953dfdc 100644
--- a/runtime/internal/clite/ffi/ffi_other.go
+++ b/runtime/internal/clite/ffi/ffi_other.go
@@ -10,7 +10,7 @@ import (
 
 const (
 	LLGoPackage = "link: $(pkg-config --libs libffi); -lffi"
-	LLGoFiles   = "$(pkg-config --cflags libffi): _wrap/libffi.cpp"
+	LLGoFiles   = "$(pkg-config --cflags libffi): _wrap/libffi.c"
 )
 
 /*
diff --git a/runtime/internal/clite/libuv/_wrap/libuv.cpp b/runtime/internal/clite/libuv/_wrap/libuv.c
similarity index 82%
rename from runtime/internal/clite/libuv/_wrap/libuv.cpp
rename to runtime/internal/clite/libuv/_wrap/libuv.c
index 30114341..d3d51448 100644
--- a/runtime/internal/clite/libuv/_wrap/libuv.cpp
+++ b/runtime/internal/clite/libuv/_wrap/libuv.c
@@ -1,9 +1,5 @@
 #include <uv.h>
 
-extern "C" {
-  
 int uv_tcp_get_io_watcher_fd (uv_tcp_t* handle) {
   return handle->io_watcher.fd;
-}
-
-}
+}
\ No newline at end of file
diff --git a/runtime/internal/clite/libuv/libuv.go b/runtime/internal/clite/libuv/libuv.go
index b9dd6424..b781f1b5 100644
--- a/runtime/internal/clite/libuv/libuv.go
+++ b/runtime/internal/clite/libuv/libuv.go
@@ -9,7 +9,7 @@ import (
 
 const (
 	LLGoPackage = "link: $(pkg-config --libs libuv); -luv"
-	LLGoFiles   = "$(pkg-config --cflags libuv): _wrap/libuv.cpp"
+	LLGoFiles   = "$(pkg-config --cflags libuv): _wrap/libuv.c"
 )
 
 // ----------------------------------------------
diff --git a/runtime/internal/clite/openssl/_wrap/openssl.cpp b/runtime/internal/clite/openssl/_wrap/openssl.c
similarity index 84%
rename from runtime/internal/clite/openssl/_wrap/openssl.cpp
rename to runtime/internal/clite/openssl/_wrap/openssl.c
index 8d7c8680..7cc5bbdb 100644
--- a/runtime/internal/clite/openssl/_wrap/openssl.cpp
+++ b/runtime/internal/clite/openssl/_wrap/openssl.c
@@ -1,9 +1,5 @@
 #include <openssl/crypto.h>
 
-extern "C" {
-
 void opensslFree(void *ptr) {
     OPENSSL_free(ptr);
 }
-
-}
\ No newline at end of file
diff --git a/runtime/internal/clite/openssl/openssl.go b/runtime/internal/clite/openssl/openssl.go
index 8bca7d28..df237c85 100644
--- a/runtime/internal/clite/openssl/openssl.go
+++ b/runtime/internal/clite/openssl/openssl.go
@@ -25,7 +25,7 @@ import (
 // -----------------------------------------------------------------------------
 
 const (
-	LLGoFiles   = "$(pkg-config --cflags openssl): _wrap/openssl.cpp"
+	LLGoFiles   = "$(pkg-config --cflags openssl): _wrap/openssl.c"
 	LLGoPackage = "link: $(pkg-config --libs openssl); -lssl -lcrypto"
 )
 
diff --git a/runtime/internal/clite/os/_os/os.cpp b/runtime/internal/clite/os/_os/os.c
similarity index 91%
rename from runtime/internal/clite/os/_os/os.cpp
rename to runtime/internal/clite/os/_os/os.c
index db43043c..45c2e8e8 100644
--- a/runtime/internal/clite/os/_os/os.cpp
+++ b/runtime/internal/clite/os/_os/os.c
@@ -1,8 +1,6 @@
 #include <stdlib.h>
 #include <errno.h>
 
-extern "C" {
-
 int cliteClearenv()
 {
 	extern char **environ;
@@ -14,5 +12,3 @@ int cliteClearenv()
 }
 
 int cliteErrno() { return errno; }
-
-}
diff --git a/runtime/internal/clite/os/os_darwin.go b/runtime/internal/clite/os/os_darwin.go
index 5dccd605..3de6684e 100644
--- a/runtime/internal/clite/os/os_darwin.go
+++ b/runtime/internal/clite/os/os_darwin.go
@@ -23,7 +23,7 @@ import (
 )
 
 const (
-	LLGoFiles   = "_os/os.cpp"
+	LLGoFiles   = "_os/os.c"
 	LLGoPackage = "link"
 )
 
diff --git a/runtime/internal/clite/os/os_other.go b/runtime/internal/clite/os/os_other.go
index e07e04a6..55bf6132 100644
--- a/runtime/internal/clite/os/os_other.go
+++ b/runtime/internal/clite/os/os_other.go
@@ -25,7 +25,7 @@ import (
 )
 
 const (
-	LLGoFiles   = "_os/os.cpp"
+	LLGoFiles   = "_os/os.c"
 	LLGoPackage = "link"
 )
 
diff --git a/runtime/internal/lib/internal/cpu/_wrap/cpu_x86.cpp b/runtime/internal/lib/internal/cpu/_wrap/cpu_x86.c
similarity index 97%
rename from runtime/internal/lib/internal/cpu/_wrap/cpu_x86.cpp
rename to runtime/internal/lib/internal/cpu/_wrap/cpu_x86.c
index 1305c86c..3756ee17 100644
--- a/runtime/internal/lib/internal/cpu/_wrap/cpu_x86.cpp
+++ b/runtime/internal/lib/internal/cpu/_wrap/cpu_x86.c
@@ -1,6 +1,3 @@
-
-extern "C" {
-
 #if defined(__GNUC__) || defined(__clang__)
 void llgo_getcpuid(unsigned int eax, unsigned int ecx,
                    unsigned int *a, unsigned int *b,
@@ -22,5 +19,3 @@ void llgo_getcpuid(unsigned int eax, unsigned int ecx,
 #else
 #error This code requires GCC or Clang
 #endif
-
-}
\ No newline at end of file
diff --git a/runtime/internal/lib/internal/cpu/cpu_x86.go b/runtime/internal/lib/internal/cpu/cpu_x86.go
index 47374b9e..46022c42 100644
--- a/runtime/internal/lib/internal/cpu/cpu_x86.go
+++ b/runtime/internal/lib/internal/cpu/cpu_x86.go
@@ -10,7 +10,7 @@ import (
 
 const (
 	LLGoPackage = "link"
-	LLGoFiles   = "_wrap/cpu_x86.cpp"
+	LLGoFiles   = "_wrap/cpu_x86.c"
 )
 
 //go:linkname c_getcpuid C.llgo_getcpuid
diff --git a/runtime/internal/lib/internal/syscall/unix/_unix/fcntl_unix.cpp b/runtime/internal/lib/internal/syscall/unix/_unix/fcntl_unix.c
similarity index 96%
rename from runtime/internal/lib/internal/syscall/unix/_unix/fcntl_unix.cpp
rename to runtime/internal/lib/internal/syscall/unix/_unix/fcntl_unix.c
index 1224ab0e..fa1ad6f9 100644
--- a/runtime/internal/lib/internal/syscall/unix/_unix/fcntl_unix.cpp
+++ b/runtime/internal/lib/internal/syscall/unix/_unix/fcntl_unix.c
@@ -9,8 +9,6 @@ struct fcntl_ret
     int32_t err; // Error code
 };
 
-extern "C" {
-
 // llgo_fcntl implements the fcntl system call wrapper for Go
 // fd: file descriptor
 // cmd: fcntl command
@@ -32,6 +30,4 @@ struct fcntl_ret llgo_fcntl2(int32_t fd, int32_t cmd, int32_t arg)
     }
 
     return ret;
-}
-
-}
+}
\ No newline at end of file
diff --git a/runtime/internal/lib/internal/syscall/unix/fcntl_unix.go b/runtime/internal/lib/internal/syscall/unix/fcntl_unix.go
index 140c6c94..93c768d9 100644
--- a/runtime/internal/lib/internal/syscall/unix/fcntl_unix.go
+++ b/runtime/internal/lib/internal/syscall/unix/fcntl_unix.go
@@ -8,7 +8,7 @@ import (
 // llgo:skip fcntl
 const (
 	LLGoPackage = "link"
-	LLGoFiles   = "_unix/fcntl_unix.cpp"
+	LLGoFiles   = "_unix/fcntl_unix.c"
 )
 
 //go:linkname llgo_fcntl2 C.llgo_fcntl2
diff --git a/runtime/internal/lib/runtime/_wrap/runtime.cpp b/runtime/internal/lib/runtime/_wrap/runtime.c
similarity index 89%
rename from runtime/internal/lib/runtime/_wrap/runtime.cpp
rename to runtime/internal/lib/runtime/_wrap/runtime.c
index 269a7b22..4dc23cfd 100644
--- a/runtime/internal/lib/runtime/_wrap/runtime.cpp
+++ b/runtime/internal/lib/runtime/_wrap/runtime.c
@@ -1,7 +1,5 @@
 #include <unistd.h>
 
-extern "C" {
-
 int llgo_maxprocs()
 {
 #ifdef _SC_NPROCESSORS_ONLN
@@ -10,5 +8,3 @@ int llgo_maxprocs()
     return 1;
 #endif
 }
-
-}
diff --git a/runtime/internal/lib/runtime/runtime.go b/runtime/internal/lib/runtime/runtime.go
index 116bcc48..398d248a 100644
--- a/runtime/internal/lib/runtime/runtime.go
+++ b/runtime/internal/lib/runtime/runtime.go
@@ -28,7 +28,7 @@ type _runtime struct{}
 
 const (
 	LLGoPackage = "link"
-	LLGoFiles   = "_wrap/runtime.cpp"
+	LLGoFiles   = "_wrap/runtime.c"
 )
 
 // GOROOT returns the root of the Go tree. It uses the