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* Modularize autoconf platform detectionJohn Ericson2021-10-311-1/+1
| | | | | | | This will allow better reuse of it, such as in the upcoming RTS configure script. Progress towards #17191
* hadrian: Don't depend upon bash from PATHBen Gamari2021-05-061-0/+15
Previously Hadrian depended implicitly upon whatever `bash` it found in `PATH`, offerring no way for the user to override. Fix this by detecting `sh` in `configure` and passing the result to Hadrian. Fixes #19797.