GoogleTest 1.6 with Cygwin 1.7 compile error: 'fileno' was not declared in this scope

Question

GoogleTest 1.6 with Cygwin 1.7: 'fileno' was not declared in this scope

Error message when building a simple test on Factorial() function in Eclipse CDT:

Invoking: Cygwin C++ Compiler
g++ -std=c++0x -DGTEST_OS_CYGWIN=1 -I"E:\source\gtest-1.6.0\include" -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/challenge.d" -MT"src/challenge.d" -o "src/challenge.o" "../src/challenge.cpp"
In file included from E:\source\gtest-1.6.0\include/gtest/internal/gtest-internal.h:40:0,
                 from E:\source\gtest-1.6.0\include/gtest/gtest.h:57,
                 from ../src/challenge.cpp:11:
E:\source\gtest-1.6.0\include/gtest/internal/gtest-port.h: In function 'int testing::internal::posix::FileNo(FILE*)':
E:\source\gtest-1.6.0\include/gtest/internal/gtest-port.h:1589:51: error: 'fileno' was not declared in this scope
E:\source\gtest-1.6.0\include/gtest/internal/gtest-port.h:1595:57: error: 'strdup' was not declared in this scope
E:\source\gtest-1.6.0\include/gtest/internal/gtest-port.h:1627:71: error: 'fdopen' was not declared in this scope

Eclipse CDT 8.1 running gcc 4.7.3 on Cygwin 1.7.22

gTest 1.6 succesfully built including demo tests, with cmake 2.8.9 on Cygwin 1.7.22

I've linked the built lib with full path, E:\lib\gtest-1.6.0\Cygwin\libgtest.a

The following command option was added manually, got same error without it.

-DGTEST_OS_CYGWIN=1

Seems the errors have nothing to do with my code. Anyone using gTest with Eclipse and Cygwin?

Thank you,

unsigned long Factorial(unsigned n) {
    return n==0? 0 : n*Factorial(n-1);
}

// Tests factorial of 0.
TEST(FactorialTest, HandlesZeroInput) {
  EXPECT_EQ(1, Factorial(0));
}

// Tests factorial of positive numbers.
TEST(FactorialTest, HandlesPositiveInput) {
  EXPECT_EQ(1, Factorial(1));
  EXPECT_EQ(2, Factorial(2));
  EXPECT_EQ(6, Factorial(3));
  EXPECT_EQ(40320, Factorial(8));
}

Answer 1

Setting the C++ standard to -std=gnu++0x rather than -std=c++0x, worked for me. You can try the statement:

g++ -std=gnu++0x -DGTEST_OS_CYGWIN=1 -I"E:\source\gtest-1.6.0\include" -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/challenge.d" -MT"src/challenge.d" -o "src/challenge.o" "../src/challenge.cpp"

Setting symbol (-DGTEST_OS_CYGWIN=1) has got nothing to do with this error.