Unable to build with -Wall -Werror flags and GCC

[r2d2leboss]

We're using -Wall -Werror and we would like to add Easylogging++ support. However, it looks like Easylogging++ is unable to build with -Wall -Werror flags. I can't even compile the hello world provided in the README. Output is given below. I don't have errors with Clang.

To reproduce:

g++ main.cpp easylogging++.cc -o prog -std=c++11 -Wall -Werror

main.cpp

#include "easylogging++.h"

INITIALIZE_EASYLOGGINGPP

int main(int argc, char* argv[]) {
   LOG(INFO) << "My first info log using default logger";
   return 0;
}

Output:

In file included from main.cpp:1:0:
easylogging++.h:731:34: error: 'el::base::consts::kInfoLevelLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kInfoLevelLogValue = ELPP_LITERAL("INFO");
^
easylogging++.h:732:34: error: 'el::base::consts::kDebugLevelLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kDebugLevelLogValue = ELPP_LITERAL("DEBUG");
^
easylogging++.h:733:34: error: 'el::base::consts::kWarningLevelLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kWarningLevelLogValue = ELPP_LITERAL("WARNING");
^
easylogging++.h:734:34: error: 'el::base::consts::kErrorLevelLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kErrorLevelLogValue = ELPP_LITERAL("ERROR");
^
easylogging++.h:735:34: error: 'el::base::consts::kFatalLevelLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kFatalLevelLogValue = ELPP_LITERAL("FATAL");
^
easylogging++.h:736:34: error: 'el::base::consts::kVerboseLevelLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kVerboseLevelLogValue =
^
easylogging++.h:738:34: error: 'el::base::consts::kTraceLevelLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kTraceLevelLogValue = ELPP_LITERAL("TRACE");
^
easylogging++.h:739:34: error: 'el::base::consts::kInfoLevelShortLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kInfoLevelShortLogValue = ELPP_LITERAL("I");
^
easylogging++.h:740:34: error: 'el::base::consts::kDebugLevelShortLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kDebugLevelShortLogValue = ELPP_LITERAL("D");
^
easylogging++.h:741:34: error: 'el::base::consts::kWarningLevelShortLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kWarningLevelShortLogValue = ELPP_LITERAL("W");
^
easylogging++.h:742:34: error: 'el::base::consts::kErrorLevelShortLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kErrorLevelShortLogValue = ELPP_LITERAL("E");
^
easylogging++.h:743:34: error: 'el::base::consts::kFatalLevelShortLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kFatalLevelShortLogValue = ELPP_LITERAL("F");
^
easylogging++.h:744:34: error: 'el::base::consts::kVerboseLevelShortLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kVerboseLevelShortLogValue = ELPP_LITERAL("V");
^
easylogging++.h:745:34: error: 'el::base::consts::kTraceLevelShortLogValue' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kTraceLevelShortLogValue = ELPP_LITERAL("T");
^
easylogging++.h:747:34: error: 'el::base::consts::kAppNameFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kAppNameFormatSpecifier = ELPP_LITERAL("%app");
^
easylogging++.h:748:34: error: 'el::base::consts::kLoggerIdFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kLoggerIdFormatSpecifier = ELPP_LITERAL("%logger");
^
easylogging++.h:749:34: error: 'el::base::consts::kThreadIdFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kThreadIdFormatSpecifier = ELPP_LITERAL("%thread");
^
easylogging++.h:750:34: error: 'el::base::consts::kSeverityLevelFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kSeverityLevelFormatSpecifier = ELPP_LITERAL("%level");
^
easylogging++.h:751:34: error: 'el::base::consts::kSeverityLevelShortFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kSeverityLevelShortFormatSpecifier = ELPP_LITERAL("%levshort");
^
easylogging++.h:752:34: error: 'el::base::consts::kDateTimeFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kDateTimeFormatSpecifier = ELPP_LITERAL("%datetime");
^
easylogging++.h:753:34: error: 'el::base::consts::kLogFileFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kLogFileFormatSpecifier = ELPP_LITERAL("%file");
^
easylogging++.h:754:34: error: 'el::base::consts::kLogFileBaseFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kLogFileBaseFormatSpecifier = ELPP_LITERAL("%fbase");
^
easylogging++.h:755:34: error: 'el::base::consts::kLogLineFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kLogLineFormatSpecifier = ELPP_LITERAL("%line");
^
easylogging++.h:756:34: error: 'el::base::consts::kLogLocationFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kLogLocationFormatSpecifier = ELPP_LITERAL("%loc");
^
easylogging++.h:757:34: error: 'el::base::consts::kLogFunctionFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kLogFunctionFormatSpecifier = ELPP_LITERAL("%func");
^
easylogging++.h:758:34: error: 'el::base::consts::kCurrentUserFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kCurrentUserFormatSpecifier = ELPP_LITERAL("%user");
^
easylogging++.h:759:34: error: 'el::base::consts::kCurrentHostFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kCurrentHostFormatSpecifier = ELPP_LITERAL("%host");
^
easylogging++.h:760:34: error: 'el::base::consts::kMessageFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kMessageFormatSpecifier = ELPP_LITERAL("%msg");
^
easylogging++.h:761:34: error: 'el::base::consts::kVerboseLevelFormatSpecifier' defined but not used [-Werror=unused-variable]
static const base::type::char_t* kVerboseLevelFormatSpecifier = ELPP_LITERAL("%vlevel");
^
easylogging++.h:762:20: error: 'el::base::consts::kDateTimeFormatSpecifierForFilename' defined but not used [-Werror=unused-variable]
static const char* kDateTimeFormatSpecifierForFilename = "%datetime";
^
easylogging++.h:764:20: error: 'el::base::consts::kDays' defined but not used [-Werror=unused-variable]
static const char* kDays[7] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
^
In file included from main.cpp:1:0:
easylogging++.h:765:20: error: 'el::base::consts::kDaysAbbrev' defined but not used [-Werror=unused-variable]
static const char* kDaysAbbrev[7] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
^
easylogging++.h:766:20: error: 'el::base::consts::kMonths' defined but not used [-Werror=unused-variable]
static const char* kMonths[12] = { "January", "February", "March", "Apri", "May", "June", "July", "August",
^
easylogging++.h:769:20: error: 'el::base::consts::kMonthsAbbrev' defined but not used [-Werror=unused-variable]
static const char* kMonthsAbbrev[12] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
^
easylogging++.h:770:20: error: 'el::base::consts::kDefaultDateTimeFormat' defined but not used [-Werror=unused-variable]
static const char* kDefaultDateTimeFormat = "%Y-%M-%d %H:%m:%s,%g";
^
easylogging++.h:771:20: error: 'el::base::consts::kDefaultDateTimeFormatInFilename' defined but not used [-Werror=unused-variable]
static const char* kDefaultDateTimeFormatInFilename = "%Y-%M-%d_%H-%m";
^
easylogging++.h:773:20: error: 'el::base::consts::kAm' defined but not used [-Werror=unused-variable]
static const char* kAm = "AM";
^
easylogging++.h:774:20: error: 'el::base::consts::kPm' defined but not used [-Werror=unused-variable]
static const char* kPm = "PM";
^
easylogging++.h:784:20: error: 'el::base::consts::kPerformanceLoggerId' defined but not used [-Werror=unused-variable]
static const char* kPerformanceLoggerId = "performance";
^
easylogging++.h:789:20: error: 'el::base::consts::kNullPointer' defined but not used [-Werror=unused-variable]
static const char* kNullPointer = "nullptr";
^
easylogging++.h:798:20: error: 'el::base::consts::kUnknownUser' defined but not used [-Werror=unused-variable]
static const char* kUnknownUser = "user";
^
easylogging++.h:799:20: error: 'el::base::consts::kUnknownHost' defined but not used [-Werror=unused-variable]
static const char* kUnknownHost = "unknown-host";
^
easylogging++.h:807:20: error: 'el::base::consts::kDefaultLogFile' defined but not used [-Werror=unused-variable]
static const char* kDefaultLogFile = "logs/myeasylog.log";
^
easylogging++.h:814:20: error: 'el::base::consts::kDefaultLogFileParam' defined but not used [-Werror=unused-variable]
static const char* kDefaultLogFileParam = "--default-log-file";
^
easylogging++.h:824:20: error: 'el::base::consts::kValidLoggerIdSymbols' defined but not used [-Werror=unused-variable]
static const char* kValidLoggerIdSymbols =
^
easylogging++.h:826:20: error: 'el::base::consts::kConfigurationComment' defined but not used [-Werror=unused-variable]
static const char* kConfigurationComment = "##";
^
easylogging++.h:827:20: error: 'el::base::consts::kConfigurationLevel' defined but not used [-Werror=unused-variable]
static const char* kConfigurationLevel = "";
^
easylogging++.h:828:20: error: 'el::base::consts::kConfigurationLoggerId' defined but not used [-Werror=unused-variable]
static const char kConfigurationLoggerId = "--";
^
cc1plus: all warnings being treated as errors

[abumq]

I will address this in next release

[rkfg]

One issue left:

easylogging++.h:740:20: error: ‘el::base::consts::kPerformanceLoggerId’ defined but not used [-Werror=unused-variable]
 static const char* kPerformanceLoggerId                    =      "performance";
                    ^~~~~~~~~~~~~~~~~~~~

[maywine]

I also got this problem:
easylogging++.h:740:20: error: ‘el::base::consts::kPerformanceLoggerId’ defined but not used [-Werror=unused-variable]
static const char* kPerformanceLoggerId = "performance";

[benrubson]

Also facing this :

‘el::base::consts::kSysLogLoggerId’ defined but not used [-Wunused-variable]
783 static const char* kSysLogLoggerId                         =      "syslog";

Did you manage to get rid of this ?
Thx 👍