internal/build:compile with c mode,when c file

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...)

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;
 }
-
-}

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"
 )
 

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);
 }
@@ -41,5 +39,3 @@ void llgo_stacktrace(int skip, void *ctx, int (*fn)(void *ctx, void *pc, void *o
         }
     }
 }
-
-}

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 {

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);
 }
-
-}

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"
 )
 
 /*

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;
 }
-
-}

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"
 )
 
 // ----------------------------------------------

runtime/internal/clite/openssl/_wrap/openssl.c

@@ -1,9 +1,5 @@
 #include <openssl/crypto.h>
 
-extern "C" {
-
 void opensslFree(void *ptr) {
     OPENSSL_free(ptr);
 }
-
-}

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"
 )
 

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; }
-
-}

runtime/internal/clite/os/os_darwin.go

@@ -23,7 +23,7 @@ import (
 )
 
 const (
-	LLGoFiles   = "_os/os.cpp"
+	LLGoFiles   = "_os/os.c"
 	LLGoPackage = "link"
 )
 

runtime/internal/clite/os/os_other.go

@@ -25,7 +25,7 @@ import (
 )
 
 const (
-	LLGoFiles   = "_os/os.cpp"
+	LLGoFiles   = "_os/os.c"
 	LLGoPackage = "link"
 )
 

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
-
-}

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

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
@@ -33,5 +31,3 @@ struct fcntl_ret llgo_fcntl2(int32_t fd, int32_t cmd, int32_t arg)
 
     return ret;
 }
-
-}

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

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
 }
-
-}

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