Update FlexDLL to 0.37

Also switch AppVeyor back to only testing the bootstrap on the mingw32
build and some tweaks to the docs.

README.win32.adoc

@@ -73,10 +73,10 @@ https://github.com/alainfrisch/flexdll. A binary distribution is available;
 instructions on how to build FlexDLL from sources, including how to bootstrap
 FlexDLL and OCaml are given <<seflexdll,later in this document>>.  Unless you
 bootstrap FlexDLL, you will need to ensure that the directory to which you
-install FlexDLL is included in your `PATH` environment variable. Note: binary distributions
-of FlexDLL are compatible only with certain versions of Visual Studio; for instance
-version 0.36 of FlexDLL require Visual Studio 2015 or above, while earlier versions
-require older versions of Visual Studio.
+install FlexDLL is included in your `PATH` environment variable. Note: binary
+distributions of FlexDLL are compatible only with Visual Studio 2013 and
+earlier; for Visual Studio 2015 and later, you will need to compile the C
+objects from source, or build ocaml using the flexdll target.
 
 The base bytecode system (ocamlc, ocaml, ocamllex, ocamlyacc, ...) of all three
 ports runs without any additional tools.
@@ -388,7 +388,7 @@ and adapt their existing code bases accordingly.
 Note: in order for ocaml tools to support Unicode pathnames, it is
 necessary to use a version of FlexDLL which has itself been compiled
 with OCaml >= 4.06 in Unicode mode.  This is the case for binary distributions
-of FlexDLL starting from version 0.36 and above.
+of FlexDLL starting from version 0.37 and above.
 
 == Trademarks
 

appveyor.yml

@@ -26,6 +26,7 @@ environment:
     CYG_ROOT: C:/cygwin64
     CYG_MIRROR: http://mirrors.kernel.org/sourceware/cygwin/
     CYG_CACHE: C:/cygwin64/var/cache/setup
+    FLEXDLL_VERSION: 0.37
     OCAMLRUNPARAM: v=0,b
     OCAMLROOT: "%PROGRAMFILES%/OCaml"
     OCAMLROOT2: "%PROGRAMFILES%/OCaml-mingw32"

appveyor_build.cmd

@@ -56,18 +56,14 @@ if %CYGWIN_UPGRADE_REQUIRED% equ 1 (
 goto :EOF
 
 :install
-rem Temporarily initialise the submodule in the main (msvc64) build
-git submodule update --init flexdll
 git worktree add ..\build-mingw32 -b appveyor-build-mingw32
 cd ..\build-mingw32
 git submodule update --init flexdll
 git worktree add ..\build-msvc32 -b appveyor-build-msvc32
-rem Temporarily initialise the submodule in the msvc32 build
-cd ..\build-msvc32
-git submodule update --init flexdll
 
-rem appveyor DownloadFile "http://alain.frisch.fr/flexdll/flexdll-0.35.tar.gz" -FileName "flexdll.tar.gz" || exit /b 1
-appveyor DownloadFile "http://alain.frisch.fr/flexdll/flexdll-bin-0.35.zip" -FileName "flexdll.zip" || exit /b 1
+cd "%APPVEYOR_BUILD_FOLDER%"
+appveyor DownloadFile "https://github.com/alainfrisch/flexdll/archive/0.37.tar.gz" -FileName "flexdll.tar.gz" || exit /b 1
+appveyor DownloadFile "https://github.com/alainfrisch/flexdll/releases/download/0.37/flexdll-bin-0.37.zip" -FileName "flexdll.zip" || exit /b 1
 rem flexdll.zip is processed here, rather than in appveyor_build.sh because the
 rem unzip command comes from MSYS2 (via Git for Windows) and it has to be
 rem invoked via cmd /c in a bash script which is weird(er).

appveyor_build.sh

@@ -52,25 +52,18 @@ case "$1" in
   install)
     mkdir -p "$PREFIX/bin/flexdll"
     cd $APPVEYOR_BUILD_FOLDER/../flexdll
-    for f in flexdll.h flexlink.exe default_amd64.manifest ; do
+    # msvc64 objects need to be compiled with VS2015, so are copied later from
+    # a source build.
+    for f in flexdll.h flexlink.exe flexdll*_msvc.obj default*.manifest ; do
       cp $f "$PREFIX/bin/flexdll/$f"
     done
     echo 'eval $($APPVEYOR_BUILD_FOLDER/tools/msvs-promote-path)' >> ~/.bash_profile
     ;;
   msvc32-only)
-#    cd $APPVEYOR_BUILD_FOLDER/flexdll-0.35
-#    make MSVC_DETECT=0 \
-#         CHAINS=msvc \
-#         MSVC_FLAGS="-nologo -MD -D_CRT_NO_DEPRECATE -GS- -WX" \
-#         support
-#    cp flexdll*_msvc.obj "$PREFIX/bin/flexdll"
-
     cd $APPVEYOR_BUILD_FOLDER/../build-msvc32
 
     set_configuration msvc "C:/Program Files/OCaml-msmvc32" -WX
 
-    # Temporarily bootstrap flexdll
-    run "make flexdll" make flexdll
     run "make world" make world
     run "make runtimeopt" make runtimeopt
     run "make -C otherlibs/systhreads libthreadsnat.lib" \
@@ -87,11 +80,11 @@ case "$1" in
   *)
     cd $APPVEYOR_BUILD_FOLDER
 
-    # tar -xzf flexdll.tar.gz
-    # cd flexdll-0.35
-    # make MSVC_DETECT=0 CHAINS=msvc64 support
-    # cp flexdll*_msvc64.obj "$PREFIX/bin/flexdll"
-    # cd ..
+    tar -xzf $APPVEYOR_BUILD_FOLDER/flexdll.tar.gz
+    cd flexdll-$FLEXDLL_VERSION
+    make MSVC_DETECT=0 CHAINS=msvc64 support
+    cp flexdll*_msvc64.obj "$PREFIX/bin/flexdll"
+    cd ..
 
     set_configuration msvc64 "$PREFIX" -WX
 
@@ -105,8 +98,6 @@ case "$1" in
     script --quiet --return --command "make -C ../build-mingw32 flexdll world.opt" ../build-mingw32/build.log >/dev/null 2>/dev/null &
     BUILD_PID=$!
 
-    # Temporarily bootstrap flexdll
-    run "make flexdll" make flexdll
     run "make world" make world
     run "make bootstrap" make bootstrap
     run "make opt" make opt