HP-UX sed limited to 100 commands problematic for modules/wchar

[Albert Chin]

The HP-UX sed command is limited to 100 commands. From sed(1) on HP-UX
11.31:
 DESCRIPTION
      sed copies the named text files (standard input default) to the
      standard output, edited according to a script containing up to 100
      commands.  Only complete input lines are processed.  Any input text at
      the end of a file that is not terminated by a new-line character is
      ignored.

This has consequences for Makefile.in's with lots of substitutions, like
that for modules/wchar:
  # We need the following in order to create <wchar.h> when the system
  # version does not work standalone.
  wchar.h: wchar.in.h $(CXXDEFS_H) $(ARG_NONNULL_H) $(WARN_ON_USE_H)
        $(AM_V_GEN)rm -f address@hidden $@ && \
        { echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
27:       sed -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
              -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
              -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
              ...
              -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
              -e '/definition of _GL_ARG_NONNULL/r $(ARG_NONNULL_H)' \
              -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
128:        < $(srcdir)/wchar.in.h; \

So, 101 lines which causes sed to fail.

I suppose we need to require AC_PROG_SED and use $SED instead of sed
accordingly?

-- 
albert chin (address@hidden)