Allow building with the free VS 2017 build tools.

.gitattributes

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+build_tesseract_vs2017.sh eol=lf
+build_tesseract_vs2017.bat eol=crlf
+

build_tesseract_vs2017.bat

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+@ECHO ON
+IF [%1]==[--fortify] (
+    (set fortify=sourceanalyzer -b tesseract)
+    shift
+) else (
+    (set fortify=)
+)
+if [%1]==[--coverity] (
+    (set coverity=c:\cygwin64\bin\python2.7.exe /usr/bin/coverity check --)
+    shift
+) else (
+    (set coverity=)
+)
+IF [%1]==[] (
+    (set vcvarsallq="%programfiles% (x86)\Microsoft Visual Studio\2017\BuildTools\VC\Auxiliary\Build\vcvarsall.bat")
+) ELSE (
+    (set vcvarsallq="%~1")
+)
+(SET projdir=%CD%)
+CALL %vcvarsallq% x86 || GOTO ERROR
+@ECHO ON
+CD "%projdir%"
+
+rmdir /S /Q Release > nul 2>&1
+rmdir /S /Q Debug > nul 2>&1
+
+IF NOT [%fortify%]==[] (
+    %fortify% -clean || GOTO ERROR
+)
+
+%fortify% %coverity% msbuild tesseract.sln /t:Rebuild /p:Configuration=Debug /p:Platform=x86 || GOTO ERROR
+
+IF NOT [%fortify%]==[] (
+    %fortify% -scan -format fpr -f tesseract.fpr || GOTO ERROR
+)
+
+@GOTO END
+:ERROR
+@ECHO Program failed, please check this log file for errors ...
+@ECHO Errorlevel: %errorlevel%
+@EXIT /B %errorlevel%
+:END

build_tesseract_vs2017.sh

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+#! /bin/bash
+set -ex
+
+orig_path=${ORIGINAL_PATH-"${PATH}"}
+export PATH="/bin:/usr/bin"
+export PATH="${PATH}:$(cygpath -u "${WINDIR}")/System32"
+
+vcvarsall_native="${PROGRAMFILES} (x86)\\Microsoft Visual Studio\\2017\\BuildTools\\VC\\Auxiliary\\Build\\vcvarsall.bat"
+vcvarsall="$(cygpath -ua "${vcvarsall_native}")"
+setupopts=(--quiet --norestart --wait --includeRecommended)
+buildopts=()
+buildcmd=(cmd /c build_tesseract_vs2017.bat)
+run_installer=1
+toolsversion="15.0"
+platformtoolset="v141"
+windowstargetplatformversion="10.0.15063.0"
+while (( $# )) ; do
+    case "$1" in
+        --installPath)
+            run_installer=1
+            instdir="$(cygpath -ua "$2")"
+            instdir_native="$(cygpath -wa "$2")"
+            shift
+            setupopts=(--installPath "${instdir_native}" "${setupopts[@]}")
+            vcvarsall_native="${instdir_native}\\VC\\Auxiliary\\Build\\vcvarsall.bat"
+            vcvarsall="$(cygpath -ua "${vcvarsall_native}")"
+            buildopts+=("${vcvarsall_native}")
+            ;;
+        --reinstall)
+            run_installer=2
+            ;;
+        --vcvarsall)
+            run_installer=0
+            shift
+            vcvarsall="$(cygpath -ua "$1")"
+            vcvarsall_native="$(cygpath -wa "$1")"
+            buildopts+=("${vcvarsall_native}")
+            ;;
+        --tools)
+            shift
+            toolsversion="$1"
+            ;;
+        --platform)
+            shift
+            platformtoolset="$1"
+            ;;
+        --target)
+            shift
+            windowstargetplatformversion="$1"
+            ;;
+        --fortify)
+            buildopts+=(--fortify)
+            ;;
+        --coverity)
+            buildopts+=(--coverity)
+            ;;
+    esac
+    shift
+done
+
+# TODO: terminate only children of this script to avoid interference with concurrent builds
+trap '
+    err=$?
+    taskkill /f /t /im msbuild.exe 2>&1 | sed -e "s#^ERROR: #taskkill: #" || :
+    taskkill /f /t /im mspdbsrv.exe 2>&1 | sed -e "s#^ERROR: #taskkill: #" || :
+    taskkill /f /t /im vs_buildtools.exe 2>&1 | sed -e "s#^ERROR: #taskkill: #" || :
+    taskkill /f /t /im vctip.exe 2>&1 | sed -e "s#^ERROR: #taskkill: #" || :
+    exit ${err}
+    ' EXIT ERR SIGHUP SIGINT SIGTERM
+
+if (( run_installer )) ; then
+    if [[ -s "${vcvarsall}" ]] ; then
+        echo "VS2017 build tools appear installed as this file exists: ${vcvarsall}"
+    fi
+    if [[ ! -s "${vcvarsall}" ]] || (( run_installer == 2 )) ; then
+        vscomponents=(
+            "Microsoft.VisualStudio.Component.VC.Tools.x86.x64"
+            "Microsoft.VisualStudio.Component.VC.CLI.Support"
+            "Microsoft.VisualStudio.Component.Windows10SDK"
+            "Microsoft.VisualStudio.Component.Windows10SDK.15063.Desktop"
+            "Microsoft.VisualStudio.Component.VC.CoreBuildTools"
+        )
+        # vsopts=("${vscomponents[@]/%/\;includeRecommended}")
+        vsopts=("${vscomponents[@]}")
+        vsopts=(${vsopts[@]/#/--add })
+
+        test -s vs_BuildTools.exe \
+            || curl -Lo "vs_BuildTools.exe" \
+                "https://aka.ms/vs/15/release/vs_buildtools.exe"
+                # "https://download.microsoft.com/download/7/8/5/78560ECB-5371-4CB6-AA6C-6D0978AC2332/vs_BuildTools.exe"
+        chmod 0755 "vs_BuildTools.exe"
+        ( 
+            export PATH="${orig_path}"
+            cmd /c vs_BuildTools.exe "${setupopts[@]}" "${vsopts[@]}"
+        )
+    fi
+fi
+
+# git submodule update --init --recursive
+
+find -name "*.vcxproj" -exec bash -ec "
+        echo \"{}\"
+        sed -e \"s/\\\\(ToolsVersion=\\\\)\\\"14\\.0\\\"/\\1\\\"${toolsversion}\\\"/\" \
+            -e \"s/\\\\(<PlatformToolset>\\\\)v140\\\\(<\\/PlatformToolset>\\\\)/\\1${platformtoolset}\\2/\" \
+            -e \"s/\\\\(<WindowsTargetPlatformVersion>\\\\)8\\\\.1\\\\(<\\/WindowsTargetPlatformVersion>\\\\)/\\1${windowstargetplatformversion}\\2/\" \
+            < \"{}\" > \"{}\".tmp
+        if cmp -s \"{}\" \"{}\".tmp ; then rm -f \"{}\".tmp ; else { mv \"{}\".tmp \"{}\"; echo changed; } fi
+    " \;
+
+(
+    export PATH="${orig_path}"
+    "${buildcmd[@]}" "${buildopts[@]}"
+)
+