What is the correct location of gcc is on my Ubuntu 16.04 computer?

I am trying to build the software package Trilinos, and I think it failed because it couldn't locate the C compiler directory correctly. Can anyone tell what the correct location of gcc is on my Ubuntu 16.04 computer? I actually need the C, C++ and fortran directory locations.

I am using the build script:

cmake \
-DCMAKE_C_COMPILER=<path to C compiler> \
-DCMAKE_CXX_COMPILER=<path to C++ compiler> \
-DCMAKE_Fortran_COMPILER=<path to Fortran compiler> \
-DTrilinos_ENABLE_ALL_PACKAGES=ON \
-DCMAKE_INSTALL_PATH=<path to install Trilinos into> \
<path to Trilinos source>
make -j<n> install

I used directories:

<path to C compiler> = /usr/bin
<path to C++ compiler> = /usr/bin
<path to Fortran compiler> = /usr/bin

I assume C is gcc-5, C++ is g++-5 and fortran is gfortran-5?

Should the directory be /usr/lib/gcc/x86_64-linux-gnu from Linux C Compiler?

The cmake build gave error message (end part of build output):

-- The C compiler identification is unknown
-- Check for working C compiler: /usr/bin
-- Check for working C compiler: /usr/bin -- broken
CMake Error at /usr/share/cmake-3.5/Modules/CMakeTestCCompiler.cmake:61 (message): The C compiler "/usr/bin" is not able to compile a simple test program.

1 Answer

The path requires the full path including filename, using:

which gcc
/usr/bin/gcc
which g++
/usr/bin/g++