I am new to Xcode, Makefiles, and to programming generally.
I have been given an existing C++ code to work with that is built using a Makefile. Using the Makefile I can build and run the executable on my Mac (MacOS 10.14.6) with no problem.
The start of the Makefile is
CC = g++-mp-9 -Wall -O2 -std=c++14 -fopenmp
DEBUG =
CFLAGS = -c $(DEBUG) -I/opt/local/include
LFLAGS = $(DEBUG) -L/opt/local/lib -framework Accelerate -march=native -lfftw3 -lfftw3_threads -lopenblas -lm -lpthread -larmadillo
schrodinger_newton_2d: $(OBJS)
$(CC) -o schrodinger_newton_2d $(OBJS) $(LFLAGS)
main.o: main.cpp const.h functions.h
$(CC) $(CFLAGS) main.cpp
...
where schrodinger_newton_2d is the executable produced.
I want to use the debug features of Xcode 11 (or any modern IDE - see ALTERNATIVELY below) to explore and learn the code I want to use. Following these instructions I have created a command-line Xcode project and set up an external build target.
However when I try to build it in Xcode, I get the following error
g++-mp-9 -Wall -O2 -std=c++14 -fopenmp -c -I/opt/local/include main.cpp
make: g++-mp-9: No such file or directory
make: *** [main.o] Error 1
This is strange because my Makefile works just fine, and on the command line my system can find the compiler:
>$ whereis gcc
/usr/bin/gcc
Could someone please explain why Xcode can't find the compiler, and how I might fix it? (Also any tips/warnings about using Xcode to grok a code that is designed to be built using a Makefile would be appreciated!)
ALTERNATIVELY
I'm not wedded to the idea of using Xcode, I just thought it would be natural as I'm working on a mac. If there is another IDE with a good debugger that would be more suited to building a command-line executable using a Makefile then please let me know!