Rewrite PowerShell CI build script in Bash

.circleci/config.yml

@@ -1640,8 +1640,7 @@ jobs:
             - .\deps
       - run:
           name: "Building solidity"
-          command: .circleci/build_win.ps1
-          shell: powershell.exe
+          command: scripts/ci/build_win.sh
       - run:
           name: "Run solc.exe to make sure build was successful."
           command: .\build\solc\Release\solc.exe --version

scripts/ci/build_win.sh

@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+(( $# <= 1 )) || { >&2 echo "Usage: $0 [PRERELEASE_SOURCE]"; exit 1; }
+prerelease_source="${1:-ci}"
+ROOTDIR="$(realpath "$(dirname "$0")/../../")"
+FORCE_RELEASE="${FORCE_RELEASE:-}"
+CIRCLE_TAG="${CIRCLE_TAG:-}"
+
+cd "$ROOTDIR"
+if [[ $FORCE_RELEASE != "" || $CIRCLE_TAG != "" ]]; then
+    echo -n > prerelease.txt
+else
+    # Use last commit date rather than build date to avoid ending up with builds for
+    # different platforms having different version strings (and therefore producing different bytecode)
+    # if the CI is triggered just before midnight.
+    # NOTE: The -local suffix makes git not use the timezone from the commit but instead convert to
+    # local one, which we explicitly set to UTC.
+    # NOTE: git --date is supposed to support the %-m/%-d format too, but it does not seem to
+    # work on Windows. Without it we get leading zeros for month and day.
+    last_commit_date=$(TZ=UTC git show --quiet --date="format-local:%Y-%m-%d" --format="%cd")
+    last_commit_date_stripped=$(date --date="$last_commit_date" "+%Y.%-m.%-d")
+    echo -n "${prerelease_source}.${last_commit_date_stripped}" > prerelease.txt
+fi
+
+mkdir -p build/
+cd build/
+
+# NOTE: Using an array to force Bash to do wildcard expansion
+boost_dir=("${ROOTDIR}/deps/boost/lib/cmake/Boost-"*)
+
+"${ROOTDIR}/deps/cmake/bin/cmake" \
+    -G "Visual Studio 16 2019" \
+    -DBoost_DIR="${boost_dir[*]}" \
+    -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded \
+    -DCMAKE_INSTALL_PREFIX="${ROOTDIR}/uploads/" \
+    ..
+MSBuild.exe solidity.sln \
+    -property:Configuration=Release \
+    -maxCpuCount:10 \
+    -verbosity:minimal
+"${ROOTDIR}/deps/cmake/bin/cmake" \
+    --build . \
+    -j 10 \
+    --target install \
+    --config Release