Hi,

2018/8/7 Tue 21:55:46 UTC+9 Bram Moolenaar wrote:
> Ken Takata wrote:
> 
> > 2018/8/7 Tue 10:48:19 UTC+9 Michael Soyka wrote:
> > > On 8/6/2018 8:45 PM, Ken Takata wrote:
> [...]
> > > >> It appears src/Make_cyg_ming.mak also does this:
> > > >>
> > > >>        ifneq (sh.exe, $(SHELL))
> > > >>        DEL = rm
> > > >>        MKDIR = mkdir -p
> > > >>        DIRSLASH = /
> > > >>        else
> > > >>        DEL = del
> > > >>        MKDIR = mkdir
> > > >>        DIRSLASH = \\
> > > >>        endif
> > > >>
> > > >> And src/GvimExt/Make_ming.mak
> > > >>
> > > >>        ifneq (sh.exe, $(SHELL))
> > > >>        DEL = rm
> > > >>        else
> > > >>        DEL = del
> > > >>        endif
> > > >>
> > > >> Is this really wrong?
> > > > No. This is really confusing, but this is correct.
> > > >
> > > > If the makefile is executed by the "mingw32-make" command from cmd.exe,
> > > > $SHELL is set to "sh.exe" (without any path). In this case, unix-like 
> > > > commands
> > > > might not work and dos-style path is needed.
> > > I run mingw32-make from a command window and, as I've stated, the value 
> > > of SHELL includes a path specification.
> > 
> > Ah, running from cmd.exe or bash was not the cause of the difference.
> > The difference is caused by the $PATH.
> > 
> > If sh.exe is found in the $PATH, $SHELL is set to the full path of the 
> > sh.exe.
> > If it isn't found, $SHELL is set to "sh.exe" without the path specification.
> > 
> > So the conclusion is still not changed. The makefiles are correct. If $SHELL
> > is exactly same as "sh.exe", unix-like commands are not available and paths
> > must be dos-style, otherwise unix-like commands and unix-style paths can be
> > used.
> 
> Since this is confusing, it would be good to add an explanation.  How
> about this:
> 
>       # About the "sh.exe" condition, as explained by Ken Takata:

Well, my name is not important here. ;-)
I didn't know how to detect if unix-like commands can be used from a makefile
before seeing these makefiles.


>       #
>       # If the makefile is executed and sh.exe is not found in $PATH, then 
> $SHELL is

Isn't it better to mention the "mingw32-make" command?


>       # set to "sh.exe" (without any path). In this case, unix-like commands 
> might
>       # not work and a dos-style path is needed.
>       # 
>       # If the makefile is executed and sh.exe IS found in $PATH, then $SHELL 
> is set

This is the same.


>       # with the actual path of sh.exe (e.g.  "C:/msys64/usr/bin/sh.exe").  
> In this
>       # case, unix-like commands can be used.
>       # 
>       # If it is executed by the "make" command from cmd.exe, $SHELL is set to
>       # "/bin/sh". If the "make" command is in the $PATH, other unix-like 
> commands
>       # might also work.
>       # 
>       # If it is executed by the "make" command from a unix-like shell,
>       # $SHELL is set with the unix-style path (e.g. "/bin/bash").
>       # In this case, unix-like commands can be used.
>       #
>       ifneq (sh.exe, $(SHELL))


Regards,
Ken Takata

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