Fix unnecessary file creation bug (#1)

Cxbuild no longer makes __test_dummy_source__.o

compiler/_gnu_compiler_tool.py

@@ -1,48 +1,43 @@
-import os
-import re
-import cslib
-import subprocess
-import libcsbuild
-from .icompiler_tool import *
-
-
-class _GnuCompilerTool(ICompilerTool):
-    def __init__(self, compiler_path: str, command: list):
-        self.toolchain_name = "GnuCompilerTool"
-        self.command = command
-        self.compiler_path = compiler_path
-
-    def get_include_option_name(self):
-        return "-I"
-
-    def split_command(self):
-        sources = [command for command in self.command if cslib.is_source_file(command)]
-        options = [command for command in self.command if command not in sources]
-        return options, sources
-
-    def get_system_include_list(self):
-        """find system includes from 'gcc -c -v __test_dummy_source__.c'"""
-        dummy_src_path = libcsbuild.get_new_file_path("__test_dummy_source__.c")
-        redirect_path = libcsbuild.get_new_file_path("__redirect__.stdout")
-        with open(dummy_src_path, "w") as f:
-            f.flush()
-            pass
-
-        with open(redirect_path, "w") as f:
-            f.flush()
-            subprocess.call([self.compiler_path, '-v', '-c', dummy_src_path], stdout=f, stderr=f)
-
-        collect = False
-        collected = []
-        with open(redirect_path, "r") as f:
-
-            for line in f.readlines():
-                if line.strip().startswith("#include <...>"):
-                    collect = True
-                elif line.strip().startswith("End of"):
-                    collect = False
-
-                if collect:
-                    collected.append(line.strip())
-        # remove 0 index cuz, collected[0] == "#include <...>"
-        return collected[1:]
+import os
+import re
+import cslib
+import subprocess
+import libcsbuild
+
+from .icompiler_tool import *
+
+
+class _GnuCompilerTool(ICompilerTool):
+    def __init__(self, compiler_path: str, command: list):
+        self.toolchain_name = "GnuCompilerTool"
+        self.command = command
+        self.compiler_path = compiler_path
+
+    def get_include_option_name(self):
+        return "-I"
+
+    def split_command(self):
+        sources = [command for command in self.command if cslib.is_source_file(command)]
+        options = [command for command in self.command if command not in sources]
+        return options, sources
+
+    def get_system_include_list(self):
+        compiler_kind = os.path.basename(self.compiler_path)
+        if compiler_kind == "gcc":
+            command = "gcc -E -Wp,-v -xc /dev/null"
+        elif compiler_kind == "g++" or compiler_kind == "c++":
+            command = "g++ -E -Wp,-v -xc++ /dev/null"
+        else:
+            # TODO: Make no such compiler exception, and Exit gracefully
+            raise Exception("No Such Compiler Exception")
+        output = subprocess.check_output(command, stderr=subprocess.STDOUT, shell=True).decode("utf-8")
+        collect = False
+        collected = []
+        for line in output.splitlines():
+            if line.strip().startswith("#include <...>"):
+                collect = True
+            elif line.strip().startswith("End of"):
+                collect = False
+            if collect:
+                collected.append(line.strip())
+        return collected[1:]