CODEWITHSUNDEEP
c++clinkergoogletest
Kami Kaze
Kami Kaze

Reputation: 2080

googletest can't link to DUT

When I try to link the code that shall be tested to my tests I get undefined refrence. When I use the same function in the same sourcefile there is no problem. Here the linker error

g++  -o "VW_Test"  ./tests/scaleSignalTests.o  ./src/gtest-death-test.o ./src/gtest-filepath.o ./src/gtest-matchers.o ./src/gtest-port.o ./src/gtest-printers.o ./src/gtest-test-part.o ./src/gtest-typed-test.o ./src/gtest.o ./src/gtest_main.o  ./VirtualWall/PointCalc.o ./VirtualWall/checks.o ./VirtualWall/mathHelper.o   
./tests/scaleSignalTests.o: In function `TestBody':
C:\projects\VIRTUAL_WALL_TEST\Default/../tests/scaleSignalTests.cc:16: undefined reference to `multiplyInteger(int, int, int*)'
collect2.exe: error: ld returned 1 exit status
make: *** [VW_Test] Error 1
"make -j4 all" terminated with exit code 2. Build might be incomplete.

this is the test file

#include "PointCalc.h"
#include "gtest/gtest.h"
#include <math.h>


namespace {
class scaledIntTest : public ::testing::Test {
};
TEST_F(scaledIntTest, Multiplication)
{
  EXPECT_EQ(INT_FACTOR_TO_METER, 1000);
  int result = 0;

  // EXPECT_EQ(referencePoint, resultPoint);

  EXPECT_EQ(RTN_NO_ERR,
            multiplyInteger(INT_FACTOR_TO_METER * 1,
                            INT_FACTOR_TO_METER * 1,
                            &result));
  EXPECT_EQ(INT_FACTOR_TO_METER, result);
}


int foo(void)
{
  int result = 0;
  multiplyInteger(INT_FACTOR_TO_METER * 1, INT_FACTOR_TO_METER * 1, &result);
  return 1;
}
}

PointCalc.h

#ifndef POINT_CALC_H
#define POINT_CALC_H

#include "checks.h"
#define INT_FACTOR_TO_METER 1000

enum Return_codes {
  RTN_NO_ERR = 0,
  RTN_UNKNOWN,
  RTN_OUTPUT_ERR,
  RTN_MEMORY_ERR,
  RTN_INPUT_ERR,
  RTN_RANGE_ERR,
  RTN_VALIDATION_ERR
};

typedef struct sPoint {
  int x;
  int y;
  int z;
} sPoint;

int multiplyInteger(int a, int b, int *result);
int addPoints(sPoint const *a, sPoint const *b, sPoint *sum);
int subPoints(sPoint *minuend, sPoint *subtrahend, sPoint *diff);
int mulPoints(int factor, sPoint *Point, sPoint *product);

#endif

PointCalc.c

#include "PointCalc.h"
#include "checks.h"
#include "mathHelper.h"
#include <stdlib.h>

int multiplyInteger(int a, int b, int *result)
{

  if (!result) return RTN_OUTPUT_ERR;

  const long product = (long)a * b / INT_FACTOR_TO_METER;
  if (abs(product) < 32000) {
    *result = (int)product;
    return RTN_NO_ERR;
  }
  else {
    *result = sign(product) * 32000;
  }
  return RTN_RANGE_ERR;
}

I am at a loss what is going wrong here. Any suggestions on how to fix this?

Upvotes: 0

Views: 52

Answers (1)

3CxEZiVlQ
3CxEZiVlQ

Reputation: 38425

You define the function in a C file, that has default extern "C" naming convention. The function in .h must be

extern "C" int multiplyInteger(int, int, int*);

Or the entire header file declarations must be enclosed in

#ifdef __cpluplus
extern "C" {
#endif
...

#ifdef __cpluplus
}
#endif

Upvotes: 1

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