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Updating to autoconf 2.70 broke the build of GHC (Haskell compiler) on Windows using msys2. I've tracked this to commit 35a1c64600894ecc3b06b6c4b273952db7c8fc83 This commit changed the way the auxiliary dirs are managed. They were put in a space separated list and now they are put in a $PATH_SEPARATOR separated list. I.e. it replaced [AC_CONFIG_AUX_DIRS("$srcdir" "$srcdir/.." "$srcdir/../..")] with [${srcdir}${PATH_SEPARATOR}${srcdir}/..${PATH_SEPARATOR}${srcdir}/../..]. The issue is that on Windows we call configure with something like "/usr/bin/sh c:\/msys64/home/Sylvain/ghc/libraries/ghc-bignum/configure ..." and $srcdir becomes equal to c:\/msys64/home/Sylvain/ghc/libraries/ghc-bignum/. But $PATH_SEPARATOR=":" so we get:
configure:2437: looking for aux files: config.guess config.sub configure:2450: trying C/ configure:2450: trying \/msys64/home/Sylvain/ghc/libraries/ghc-bignum/ configure:2450: trying C/ configure:2450: trying \/msys64/home/Sylvain/ghc/libraries/ghc-bignum/../ configure:2450: trying C/ configure:2450: trying \/msys64/home/Sylvain/ghc/libraries/ghc-bignum/../../ configure:2503: error: cannot find required auxiliary files: config.guess config.sub
Shouldn't $ac_aux_dir_candidates be a space-separated list?
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