Add loadable modules using Daniel Colascione's ideas.scratch/dynamic-modules-2

See https://lists.gnu.org/archive/html/emacs-devel/2015-02/msg00960.html

* src/Makefile.in (base_obj): add module.o
  (LIBES): add -lltdl

* src/emacs.c (main): add syms_of_module

* src/lisp.h: add syms_of_module

* src/emacs_module.h: New file; emacs API for modules.

* src/module.c: New file; implement API.

* modules/basic/Makefile: New file; build example module on Linux.

* modules/basic/basic.c: New file; simple example module.

1 files changed, 15 insertions, 0 deletions

diff --git a/modules/basic/Makefile b/modules/basic/Makefile
new file mode 100644
index 00000000000..bb136f3577f
--- /dev/null
+++ b/modules/basic/Makefile
@@ -0,0 +1,15 @@
+ROOT = ../..
+
+CFLAGS  =
+LDFLAGS =
+
+all: basic.so basic.doc
+
+%.so: %.o
+        gcc -shared $(LDFLAGS) -o $@ $<
+
+%.o: %.c
+        gcc -ggdb3 -Wall -I$(ROOT)/src $(CFLAGS) -fPIC -c $<
+
+%.doc: %.c
+        $(ROOT)/lib-src/make-docfile $< > $@