Patch 8.1.2253
Problem:    Using "which" to check for an executable is not reliable.
Solution:   Use "command -v" instead.  Also exit with error code when
            generating tags has an error. (closes #5174)
Files:      runtime/doc/Makefile


*** ../vim-8.1.2252/runtime/doc/Makefile        2019-11-03 21:46:16.425213135 
+0100
--- runtime/doc/Makefile        2019-11-04 21:22:35.145308509 +0100
***************
*** 323,331 ****
  # Use Vim to generate the tags file.  Can only be used when Vim has been
  # compiled and installed.  Supports multiple languages.
  vimtags: $(DOCS)
!       @if which $(VIMEXE) >/dev/null; then \
!         $(VIMEXE) --clean -eX -u doctags.vim >/dev/null; \
!         echo "help tags updated"; \
          else echo "vim executable $(VIMEXE) not found; help tags not 
updated"; fi
  
  # Use "doctags" to generate the tags file.  Only works for English!
--- 323,331 ----
  # Use Vim to generate the tags file.  Can only be used when Vim has been
  # compiled and installed.  Supports multiple languages.
  vimtags: $(DOCS)
!       @if command -v $(VIMEXE); then \
!           $(VIMEXE) --clean -eX -u doctags.vim >/dev/null && \
!             echo "help tags updated"; \
          else echo "vim executable $(VIMEXE) not found; help tags not 
updated"; fi
  
  # Use "doctags" to generate the tags file.  Only works for English!
*** ../vim-8.1.2252/src/version.c       2019-11-04 20:36:46.128633933 +0100
--- src/version.c       2019-11-04 21:24:30.808840203 +0100
***************
*** 743,744 ****
--- 743,746 ----
  {   /* Add new patch number below this line */
+ /**/
+     2253,
  /**/

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