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rc/sh/pre

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#!/usr/bin/env sh
# YES_ZSH
# YES_BASH
# YES_DASH
# YES_ASH
pre() { ### @-
### dump all the `#define`s that `$CC $CPPFLAGS $CFLAGS $LDFLAGS` would result in.
###
### ```
### $ pre | shuf | head -n10
### #define __GNUC_MINOR__ 3
### #define __SIZEOF_LONG__ 4
### #define __UINT_LEAST16_TYPE__ short unsigned int
### #define __ORDER_BIG_ENDIAN__ 4321
### #define __SIZEOF_FLOAT__ 4
### #define __INTMAX_MAX__ 0x7fffffffffffffffLL
### #define __INT64_C(c) c ## LL
### #define __UINT16_MAX__ 0xffff
### #define __DEC64_MANT_DIG__ 16
### #define __DBL_HAS_INFINITY__ 1
### ```
if [ -n "${ZSH_VERSION:-}" ]; then
${CC:-gcc} -dM -E - $=CPPFLAGS $=CFLAGS $=LDFLAGS < /dev/null
else
${CC:-gcc} -dM -E - $CPPFLAGS $CFLAGS $LDFLAGS < /dev/null
fi
}
[ -n "${preload+-}" ] || pre "$@"