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74 lines
2.4 KiB
74 lines
2.4 KiB
#!/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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