How to use home-brew g++ I try to make and get:

Makefile:81: "*** WARNING g++ minor version &lt;7 ***"
mkdir -p obj_linux/codebase/spoa/src/
g++ -static-libgcc -static-libstdc++ -D__cplusplus=201103L -I"./src/" -I"/usr/include/" -Icodebase/argparser/src -Icodebase/seqlib/src -Icodebase/samscripts/src -Icodebase/spoa/src -O3 -fdata-sections -&gt;ffunction-ections -c -fmessage-length=0 -ffreestanding -fopenmp -m64 -&gt;std=c++11 -error=return-type -pthread -march=native -o obj_linux/codebase/spoa/src/alignment.o codebase/spoa/src/alignment.cpp
clang: error: unsupported option '-fopenmp'
make: *** [obj_linux/codebase/spoa/src/alignment.o] Error 1
lahmersk-iml13:racon lahmersk$ whereis g++
/usr/bin/g++


I have a home-brew install of 7.3 at /usr/local/Cellar/gcc

I tried to export PATH in .bash_profile with:

# gcc location
export PATH=/usr/local/Cellar/gcc:$PATH


My Cellar directory has:

lahmersk-iml13:Cellar lahmersk$ ls
aragorn     gdbm        libmpc      parallel    sqlite
barrnap     gmp     llvm        prodigal    tbl2asn
blast       hmmer       lmdb        prokka      xz
cmake       infernal    minced      python3
eigen       isl     mpfr        qt
gcc     libffi      openssl     readline


and gcc is:

lahmersk-iml13:Cellar lahmersk$ cd gcc
lahmersk-iml13:gcc lahmersk$ ls
7.3.0


My current bash_profile is:

# Homebrew location
export PATH=/usr/local/bin:/usr/local/sbin:$PATH

# Centrifuge location
export PATH=/Users/lahmersk/centrifuge:$PATH

# Spades location
export PATH=/Users/lahmersk/SPAdes-3.11.1-Darwin/bin:$PATH

# Bowtie2 location
export PATH=/Users/lahmersk/bowtie2-2.3.4.1:$PATH

# Pilon location
export PATH=/Users/lahmersk/pilon-1.21:$PATH

# Prokka location
export PATH=/Users/lahmersk/prokka/bin:$PATH

# Barrnap location
export PATH=/Users/lahmersk/barrnap/bin:$PATH

# gcc location
export PATH=/usr/local/Cellar/gcc:$PATH


when I do sudo vi /etc/paths I get:

/usr/local/bin
/usr/bin
/bin
/usr/sbin
/sbin   


I could use some assistance. What other info can I provide?
You shouldn't need to add the Cellar to your path for this. But Homebrew adds a version suffix to the gcc commands to avoid name clashes with the standard gcc:

pse@Mithos:~$ ssh verence@localhost brew install gcc
[...]
==&gt; Downloading https://homebrew.bintray.com/bottles/gcc-7.3.0.high_sierra.bottle.1.tar.gz
==&gt; Downloading from https://akamai.bintray.com/d0/d09669e3679bb54448f00cda4bf520e631f7487f132ebfe6e0d2f6ecdcd5f6e0?__gda__=exp=1519315844~hmac=df4f6f9b82a2ac5fb5465be3f9dc91c0c3eea0c254e894113edf5fcc2b640c57&amp;response-content-disposition=attachment%3Bfilename%3D%22gcc-7.3.0.high_sierra.bottle.1.tar.gz%22&amp;response-content-type=application%2Fgzip&amp;requestInfo=U2FsdGVkX1-mCWpMqQTGrxnTfILcUZz-NvVoQyGOGSnI4iWY_Z2bJghjhAR-xgGu9cDwVXgE9DLumAnLcf1a5kZAz724Fowtbckow4p_nVq39TQR8WNf4jMP4z7Sql3NQ2dFr1pLXQ3paB2FUCf1_A&amp;response-X-Checksum-Sha1=d492b86b3ba112920165af9df80dd793df1d8f46&amp;response-X-Checksum-Sha2=d09669e3679bb54448f00cda4bf520e631f7487f132ebfe6e0d2f6ecdcd5f6e0
==&gt; Pouring gcc-7.3.0.high_sierra.bottle.1.tar.gz
  /usr/local/Cellar/gcc/7.3.0: 1,486 files, 284.9MB

pse@Mithos:~$ ll /usr/local/bin/g*-7
lrwxr-xr-x  1 verence  admin  29 Feb 22 16:59 /usr/local/bin/g++-7@ -&gt; ../Cellar/gcc/7.3.0/bin/g++-7
lrwxr-xr-x  1 verence  admin  29 Feb 22 16:59 /usr/local/bin/gcc-7@ -&gt; ../Cellar/gcc/7.3.0/bin/gcc-7
lrwxr-xr-x  1 verence  admin  32 Feb 22 16:59 /usr/local/bin/gcc-ar-7@ -&gt; ../Cellar/gcc/7.3.0/bin/gcc-ar-7
lrwxr-xr-x  1 verence  admin  32 Feb 22 16:59 /usr/local/bin/gcc-nm-7@ -&gt; ../Cellar/gcc/7.3.0/bin/gcc-nm-7
lrwxr-xr-x  1 verence  admin  36 Feb 22 16:59 /usr/local/bin/gcc-ranlib-7@ -&gt; ../Cellar/gcc/7.3.0/bin/gcc-ranlib-7
lrwxr-xr-x  1 verence  admin  30 Feb 22 16:59 /usr/local/bin/gcov-7@ -&gt; ../Cellar/gcc/7.3.0/bin/gcov-7
lrwxr-xr-x  1 verence  admin  35 Feb 22 16:59 /usr/local/bin/gcov-dump-7@ -&gt; ../Cellar/gcc/7.3.0/bin/gcov-dump-7
lrwxr-xr-x  1 verence  admin  35 Feb 22 16:59 /usr/local/bin/gcov-tool-7@ -&gt; ../Cellar/gcc/7.3.0/bin/gcov-tool-7
lrwxr-xr-x  1 verence  admin  34 Feb 22 16:59 /usr/local/bin/gfortran-7@ -&gt; ../Cellar/gcc/7.3.0/bin/gfortran-7


So the compiler you are looking for can be invoked with g++-7.