Gcc

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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
# ...