Does not compile, relocation truncated to fit error.

[YibaiMeng]

Does not compile on Ubuntu 18.04, with gcc 7.3.0. Error message is:

g++ -o pyramid main.cpp -Wall -O3 -std=c++11 -lm -w
/tmp/ccqffTD2.o: In function `_GLOBAL__sub_I_big_prime':
main.cpp:(.text.startup+0x2f13): relocation truncated to fit: R_X86_64_PC32 against `.bss'
main.cpp:(.text.startup+0x2f31): relocation truncated to fit: R_X86_64_PC32 against `.bss'
collect2: error: ld returned 1 exit status
Makefile:8: recipe for target 'main' failed
make: *** [main] Error 1

I've found a workaround by modifying the makefile, adding -mcmodel=medium to CPPFLAGS. The project compiles right after this modification.