Gcc

Tips

Enable more warnings

From [1]:

• -Wduplicated-cond
• -Wduplicated-branches
• -Wlogical-op
• -Wrestrict
• -Wnull-dereference
• -Wold-style-cast
• -Wuseless-cast
• -Wjump-misses-init
• -Wdouble-promotion
• -Wshadow
• -Wformat=2

Get list of standard compiler defines

gcc -dM -E -x c /dev/null
# #define __DBL_MIN_EXP__ (-1021)
# #define __FLT32X_MAX_EXP__ 1024
# #define __UINT_LEAST16_MAX__ 0xffff
# #define __ATOMIC_ACQUIRE 2
# #define __FLT128_MAX_10_EXP__ 4932
# ...