Jonathan Yong is correct - removing --build allows make to complete without error using the unmodified ltmain.sh

There's still the issue of generating a call to cmd.exe with an invalid switch (//c), which will cause it to hang indefinitely if ever invoked.

The risk of breaking anything by fixing this seems like nil.
------------------------------------------------------------------------
On 6/26/2021 3:17 PM, Brian Inglis wrote:
On 2021-06-25 14:46, Dietmar May via Cygwin wrote:
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

Which you don't need to change if you configure properly, as JonY replied on the list to your earlier post:

On 2021-06-25 09:27, Jonathan Yong via Cygwin wrote:
 >
 > Don't set --build, you are building on Cygwin, not MSYS.


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