--- a/src/c-parser.c
+++ b/src/c-parser.c
@@ -1667,14 +1667,25 @@
 ScmObj Scm_ParseMacroCode(ScmObj in, ScmObj macro_list)
 {
     static ScmObj trigger_line = SCM_FALSE;
+    static ScmObj is_gcc = SCM_TRUE;
     ScmObj line_str;
     ScmObj rx;
+    int n = 0;
+    int i;
 
     /* skip the first line '# 1 "<stdin>"' */
     Scm_ReadLineUnsafe(SCM_PORT(in));
 
     if (SCM_FALSEP(trigger_line)) {
-        trigger_line = SCM_MAKE_STR_IMMUTABLE("# 1 \"<stdin>\"");
+        ScmObj gcc = Scm_GlobalVariableRef(SCM_FIND_MODULE(CPARSER_MODULE_NAME, TRUE), SCM_SYMBOL(SCM_INTERN("GCC")), 0);
+        if (SCM_INTP(Scm_StringScanRight(SCM_STRING(gcc), SCM_STRING(SCM_MAKE_STR_IMMUTABLE("gcc")), SCM_STRING_SCAN_INDEX))) {
+            trigger_line = SCM_MAKE_STR_IMMUTABLE("# 1 \"<stdin>\"");
+        } else if (SCM_INTP(Scm_StringScanRight(SCM_STRING(gcc), SCM_STRING(SCM_MAKE_STR_IMMUTABLE("clang")), SCM_STRING_SCAN_INDEX))) {
+            trigger_line = SCM_MAKE_STR_IMMUTABLE("# 1 \"<stdin>\" 2");
+            is_gcc = SCM_FALSE;
+        } else {
+            Scm_Error("unknown compiler");
+        }
     }
     
     while (!SCM_EOFP(line_str = Scm_ReadLineUnsafe(SCM_PORT(in)))) {
@@ -1683,22 +1694,33 @@
         }
     }
 
-    rx = Scm_RegComp(SCM_STRING(SCM_MAKE_STR_IMMUTABLE("^#\\s+\\d+\\s+\"<stdin>\"")), 0);
+    rx = Scm_RegComp(SCM_STRING(SCM_MAKE_STR_IMMUTABLE("^#\\s+(\\d+)\\s+\"<stdin>\"")), 0);
     line_str = Scm_ReadLineUnsafe(SCM_PORT(in));
-    while (!SCM_EOFP(line_str)) {
-        ScmObj body_str = line_str;
+    for (i = 1; !SCM_EOFP(line_str); i++) {
+        ScmObj body_str;
+        ScmObj rm;
+        if (i < n) {
+            body_str = SCM_MAKE_STR_IMMUTABLE("");
+            goto parse;
+        }
+        body_str = line_str;
         while (!SCM_EOFP(line_str = Scm_ReadLineUnsafe(SCM_PORT(in)))
                && SCM_STRING_LENGTH(line_str) >= 13
 #ifdef SCM_REGEXP_MULTI_LINE
-               && SCM_REGMATCHP(Scm_RegExec(SCM_REGEXP(rx), SCM_STRING(line_str), SCM_UNDEFINED, SCM_UNDEFINED))) {
+               && SCM_REGMATCHP(rm = Scm_RegExec(SCM_REGEXP(rx), SCM_STRING(line_str), SCM_UNDEFINED, SCM_UNDEFINED))) {
 #else
-               && SCM_REGMATCHP(Scm_RegExec(SCM_REGEXP(rx), SCM_STRING(line_str)))) {
+               && SCM_REGMATCHP(rm = Scm_RegExec(SCM_REGEXP(rx), SCM_STRING(line_str)))) {
 #endif
-            if (SCM_EOFP(line_str = Scm_ReadLineUnsafe(SCM_PORT(in)))) {
-                Scm_Error("[bug] unexpected EOF while parsing macro body");
+            if (SCM_TRUEP(is_gcc)) {
+                if (SCM_EOFP(line_str = Scm_ReadLineUnsafe(SCM_PORT(in)))) {
+                    Scm_Error("[bug] unexpected EOF while parsing macro body");
+                }
+                body_str = Scm_StringAppend2(SCM_STRING(body_str), SCM_STRING(line_str));
+            } else {
+                n = SCM_INT_VALUE(Scm_StringToNumber(SCM_STRING(Scm_RegMatchSubstr(SCM_REGMATCH(rm), SCM_MAKE_INT(1))), 10, 0));
             }
-            body_str = Scm_StringAppend2(SCM_STRING(body_str), SCM_STRING(line_str));
         }
+parse:
         if (SCM_NULLP(macro_list)) {
             Scm_Error("[bug] lost macro body");
         } else {