Use ‘echo’ safely with ‘\’ or leading ‘-’

POSIX says that ‘echo FOO’ produces implementation-defined output
if FOO contains leading ‘-’, or ‘\’ anywhere, so don’t assume GNU
behavior in that case.
* Makefile.in (removenullpaths): Remove.
(epaths-force): Rewrite to avoid the need for ‘echo’.
(install-etc): Be clearer about escaping the shell metacharacters
‘\’ and ‘$’.
* Makefile.in (install-arch-indep, install-etcdoc):
* admin/charsets/mapconv, admin/merge-gnulib, admin/merge-pkg-config:
* admin/quick-install-emacs, build-aux/gitlog-to-emacslog:
* configure.ac, lib-src/rcs2log, make-dist:
* src/Makefile.in (lisp.mk):
Don’t assume ‘echo’ outputs ‘\’ and leading ‘-’ unscathed.
For example, use ‘printf '%s\n' "$foo"’ rather than ‘echo "$foo"’
if $foo can contain arbitrary characters.
* lisp/Makefile.in (TAGS): Use ‘ls’, not ‘echo’, to avoid ‘\’ issues.
* doc/lispref/two-volume.make (vol1.pdf):
* test/etags/make-src/Makefile (web ftp publish):
Use ‘printf’ rather than ‘echo -e’.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/Makefile.in b/src/Makefile.in
index 1fb770d6657..f73575938d3 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -443,7 +443,7 @@ all: emacs$(EXEEXT) $(OTHER_FILES)
 shortlisp =
 lisp.mk: $(lispsource)/loadup.el
         @rm -f $@
-        ${AM_V_GEN}( echo "shortlisp = \\"; \
+        ${AM_V_GEN}( printf 'shortlisp = \\\n'; \
         sed -n 's/^[ \t]*(load "\([^"]*\)".*/\1/p' $< | \
           sed -e 's/$$/.elc \\/' -e 's/\.el\.elc/.el/'; \
         echo "" ) > $@