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75 lines
2.4 KiB
75 lines
2.4 KiB
3 years ago
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#!/usr/bin/env bash
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# Usage: env [ CC=... ] [ CXX=... ] [ AR=... ] [ RANLIB=... ] [ STRIP=... ] \
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# [ DEBUG=... ] ./build-id [ID_SALT]...
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#
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# Prints to stdout a SHA256 hash representing the current toolset, used by
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# depends/Makefile as a build id for caching purposes (detecting when the
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# toolset has changed and the cache needs to be invalidated).
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#
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# If the DEBUG environment variable is non-empty and the system has `tee`
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# available in its $PATH, the pre-image to the SHA256 hash will be printed to
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# stderr. This is to help developers debug caching issues in depends.
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# This script explicitly does not `set -e` because id determination is mostly
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# opportunistic: it is fine that things fail, as long as they fail consistently.
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# Command variables (CC/CXX/AR) which can be blank are invoked with `bash -c`,
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# because the "command not found" error message printed by shells often include
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# the line number, like so:
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#
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# ./depends/gen_id: line 43: --version: command not found
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#
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# By invoking with `bash -c`, we ensure that the line number is always 1
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(
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# Redirect stderr to stdout
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exec 2>&1
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echo "BEGIN ALL"
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# Include any ID salts supplied via command line
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echo "BEGIN ID SALT"
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echo "$@"
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echo "END ID SALT"
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# GCC only prints COLLECT_LTO_WRAPPER when invoked with just "-v", but we want
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# the information from "-v -E -" as well, so just include both.
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echo "BEGIN CC"
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bash -c "${CC} -v"
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bash -c "${CC} -v -E -xc -o /dev/null - < /dev/null"
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bash -c "${CC} -v -E -xobjective-c -o /dev/null - < /dev/null"
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echo "END CC"
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echo "BEGIN CXX"
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bash -c "${CXX} -v"
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bash -c "${CXX} -v -E -xc++ -o /dev/null - < /dev/null"
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bash -c "${CXX} -v -E -xobjective-c++ -o /dev/null - < /dev/null"
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echo "END CXX"
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echo "BEGIN AR"
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bash -c "${AR} --version"
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env | grep '^AR_'
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echo "ZERO_AR_DATE=${ZERO_AR_DATE}"
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echo "END AR"
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echo "BEGIN RANLIB"
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bash -c "${RANLIB} --version"
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env | grep '^RANLIB_'
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echo "END RANLIB"
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echo "BEGIN STRIP"
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bash -c "${STRIP} --version"
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env | grep '^STRIP_'
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echo "END STRIP"
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echo "END ALL"
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) | if [ -n "$DEBUG" ] && command -v tee > /dev/null 2>&1; then
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# When debugging and `tee` is available, output the preimage to stderr
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# in addition to passing through stdin to stdout
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tee >(cat 1>&2)
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else
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# Otherwise, passthrough stdin to stdout
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cat
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fi | ${SHA256SUM} - | cut -d' ' -f1
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