command-databasse has not pass the true filename to prop_db->write_file(filename, ...

[CyanCloverFern]

when i use --command-databasse
i find the error report :
"...writing to command database 'compile_commands.jsonE:\hello\compile_commands.json' FAILED...\n"
i think the problem is the filename string has pass twice. so i modifiy the file "engine\mod_command_db.cpp", i insert a line in function exit_main(int status)

old

void exit_main(int status)
	{
		if (status == EXIT_FAIL) return;
		std::string filename = output_filename;
		if (!b2::paths::is_rooted(output_filename))
		{
			if (!b2::paths::is_rooted(output_directory))
				filename = b2::cwd_str() + "/";
			filename += output_directory + "/" + output_filename;
			filename = b2::paths::normalize(filename);
		}
		if (prop_db->write_file(filename, output_format))
			out_printf("...wrote command database '%s'...\n", filename.c_str());
		else
			err_printf("...writing to command database '%s' FAILED...\n",
				filename.c_str());
	}

new

void exit_main(int status)
	{
		if (status == EXIT_FAIL) return;
		std::string filename = output_filename;
		if (!b2::paths::is_rooted(output_filename))
		{
			filename = {}
			if (!b2::paths::is_rooted(output_directory))
				filename = b2::cwd_str() + "/";
			filename += output_directory + "/" + output_filename;
			filename = b2::paths::normalize(filename);
		}
		if (prop_db->write_file(filename, output_format))
			out_printf("...wrote command database '%s'...\n", filename.c_str());
		else
			err_printf("...writing to command database '%s' FAILED...\n",
				filename.c_str());
	}

then i generate compile_command ok.

os: windows

[CyanCloverFern]

i think my modifiy is not a true change. when i use b2 --command-database=json in b2-main project, it report :
...writing to command database 'E:/b2-5.2.1/.build/compile_commands.json' FAILED...