1 files changed, 11 insertions, 5 deletions

diff --git a/lisp/Makefile.in b/lisp/Makefile.in
index 78a251b3f7c..efb95b37057 100644
--- a/lisp/Makefile.in
+++ b/lisp/Makefile.in
@@ -35,6 +35,12 @@ EMACS = ../src/emacs
 
 EMACSOPT = -batch --no-site-file --multibyte
 
+# Extra flags to pass to the byte compiler
+BYTE_COMPILE_EXTRA_FLAGS = 
+# For example to not display the undefined function warnings you can use this:
+# BYTE_COMPILE_EXTRA_FLAGS = --eval '(setq byte-compile-warnings (quote (not unresolved)))'
+# The example above is just for developers, it should not be used by default.
+
 SOURCES = *.el COPYING Makefile
 lisptagsfiles1 = $(lisp)/[a-zA-Z]*.el
 lisptagsfiles2 = $(lisp)/[a-zA-Z]*/[a-zA-Z]*.el
@@ -141,7 +147,7 @@ TAGS-LISP: $(lisptagsfiles1) $(lisptagsfiles2)
 .SUFFIXES: .elc .el
 
 .el.elc: $(lisp)/subdirs.el
-        -$(emacs) -f batch-byte-compile $<
+        -$(emacs)  $(BYTE_COMPILE_EXTRA_FLAGS) -f batch-byte-compile $<
 
 # Compile all Lisp files, but don't recompile those that are up to
 # date.  Some files don't actually get compiled because they set the
@@ -166,7 +172,7 @@ compile: $(lisp)/subdirs.el mh-autoloads doit
           if test -f $$el; \
           then \
             echo Compiling $$el; \
-            $(emacs) -f batch-byte-compile-if-not-done $$el || exit 1; \
+            $(emacs)  $(BYTE_COMPILE_EXTRA_FLAGS) -f batch-byte-compile-if-not-done $$el || exit 1; \
           fi \
         done
 
@@ -185,14 +191,14 @@ compile-always: $(lisp)/subdirs.el mh-autoloads doit
           if test -f $$el; \
           then \
             echo Compiling $$el; \
-            $(emacs) -f batch-byte-compile $$el || exit 1; \
+            $(emacs)  $(BYTE_COMPILE_EXTRA_FLAGS) -f batch-byte-compile $$el || exit 1; \
           fi \
         done
 
 compile-calc:
         for el in `find $(lisp)/calc -name '*.el'`; do \
           echo Compiling $$el; \
-          $(emacs) -f batch-byte-compile $$el || exit 1; \
+          $(emacs)  $(BYTE_COMPILE_EXTRA_FLAGS) -f batch-byte-compile $$el || exit 1; \
         done
 
 # Backup compiled Lisp files in elc.tar.gz.  If that file already
@@ -219,7 +225,7 @@ $(lisp)/progmodes/cc-mode.elc: \
         $(lisp)/progmodes/cc-mode.el \
         $(lisp)/progmodes/cc-langs.el \
         $(lisp)/progmodes/cc-defs.el
-        $(emacs) -f batch-byte-compile $(lisp)/progmodes/cc-mode.el
+        $(emacs) $(BYTE_COMPILE_EXTRA_FLAGS) -f batch-byte-compile $(lisp)/progmodes/cc-mode.el
 
 # Update MH-E internal autoloads. These are not to be confused with
 # the autoloads for the MH-E entry points, which are already in