libtool with mingw hangs building openocd in func_convert_core_msys_to_w32

[Dietmar May]

The build completes successfully by replacing the "cmd /c | sed" 
construct with simply:

func_convert_core_msys_to_w32_result=$1

so no path translation takes place.

The function then becomes:

func_convert_core_msys_to_w32 ()
{
   $debug_cmd

func_convert_core_msys_to_w32_result=$1

}


> SUMMARY
>
> func_convert_core_msys_to_w32 in
>
> /usr/share/libtool/build-aux/ltmain.sh
>
> has an extraneous '/' in the call to
>
> ( cmd //c echo "$1" )
>
> causing make to hang indefinitely
>
> when configured with
>
> --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32
>
>
> The project builds successfully on msys2 & mingw-w64-x86_64-gcc 
> installed, as well as on git-for-windows-sdk (which uses msys2). msys2 
> has the same issue ('//c'), but the compiler is in the path, so no 
> cross-compilation configuration is needed (and apparently this 
> function is not invoked).
>
>
> DETAILS
>
> func_convert_core_msys_to_w32() in the generated libtool script, when 
> configured using --build and --host for mingw, expands to:
>
> cmd //c echo ... | sed
>
> //c is not a valid option to cmd.exe, and causes cmd.exe to hang 
> indefinitely. This is reproducible from the command line:
>
> cmd //c echo .libs/ | /usr/bin/sed -e 's/[ ]*$//' -e 
> 's|\\\\*|\\|g;s|/|\\|g;s|\\|\\\\|g'
>
> ps aux shows cmd.exe, with sed at pid cmd.exe + 1. kill is the only 
> way to terminate.
>
> By changing "cmd //c" to "cmd /c", the command completes successfully.
>
>
> /usr/share/libtool/build-aux/ltmain.sh is the template, which contains 
> the code:
>
> # func_convert_core_msys_to_w32 ARG
> # Convert file name or path ARG from MSYS format to w32 format. Return
> # result in func_convert_core_msys_to_w32_result.
> func_convert_core_msys_to_w32 ()
> {
>   $debug_cmd
>
>   # awkward: cmd appends spaces to result
>   func_convert_core_msys_to_w32_result=`( cmd //c echo "$1" ) 
> 2>/dev/null` |
>     $SED -e 's/[ ]*$//' -e "$sed_naive_backslashify"`
> }
> #end: func_convert_core_msys_to_w32
>
> I've been able to get past this problem by editing this file and 
> running configure again.
>
> Unfortunately, make aborts at a later point with a different (but 
> perhaps related?) error:
>
> func_to_tool_file src/.libs/libopenocd.libcmd
>
> func_convert_file_msys_to_w32 src/.libs/libopenocd.libcmd
> func_convert_core_msys_to_w32 src/.libs/libopenocd.libcmd
> func_convert_file_check src/.libs/libopenocd.libcmd 
> src\\.libs\\libopenocd.libcmd
> func_execute_cmds $AR $AR_FLAGS $oldlib$oldobjs~$RANLIB $tool_oldlib 
> exit $?
>  exit $?w_eval x86_64-w64-mingw32-ar cru src/.libs/libopenocd.a 
> @src\\.libs\\libopenocd.libcmd
> func_quote_for_expand x86_64-w64-mingw32-ar cru src/.libs/libopenocd.a 
> @src\\.libs\\libopenocd.libcmd
> func_notquiet x86_64-w64-mingw32-ar cru src/.libs/libopenocd.a 
> @src\\.libs\\libopenocd.libcmd
> func_echo x86_64-w64-mingw32-ar cru src/.libs/libopenocd.a 
> @src\\.libs\\libopenocd.libcmd
>
>
> libtool: link: x86_64-w64-mingw32-ar cru src/.libs/libopenocd.a 
> @src\\.libs\\libopenocd.libcmd
>
> : No such file or directory\.libs\libopenocd.libcmd
> make[2]: *** [Makefile:2811: src/libopenocd.la] Error 1
>
> The file *is* there:
>
> $ ls src/.libs
> libopenocd.lax  libopenocd.libcmd
>
> Running the command directly completes with no errors:
>
> $ x86_64-w64-mingw32-ar cru src/.libs/libopenocd.a 
> @src\\.libs\\libopenocd.libcmd
> $
>
>
> One thing I don't understand is why libtool is converting paths to 
> windows format to run inside of a cygwin shell. The command completes 
> successfully *if no path conversion occurs* - so why bother?
>
> $ x86_64-w64-mingw32-ar cru src/.libs/libopenocd.a 
> @src/.libs/libopenocd.libcmd
>
> $
>
> Is this a holdover from 13 year old mingw behavior? or related somehow 
> to running autotools in a cmd.exe environment (like Microsoft's 
> original NT "posix" subsystem, a port of gnu commands to run 
> "natively" under cmd.exe)?
>
> Can libtool just ditch all of the back and forth path conversions, and 
> simplify all of this?
>
>
> REPRODUCING
>
> Install mingw64-x86_64-gcc-g++, autoconf, autoconf2.1, autoconf2.5, 
> automake and pkg-config in cygwin.
>
> I believe that will pull in all required dependencies.
>
>
> git clone https://git.code.sf.net/p/openocd/code
>
> cd openocd
>
> ./bootstrap
>
> ./configure --disable-werror --disable-doxygen-pdf --enable-ftdi 
> --enable-jlink --build=x86_64-w64-mingw32 --host=x86_64-w64-mingw32
>
> make # or make -j8
>
>