gnu: Build lua-5.2 with a dynamic library

* gnu/packages/patches/lua52-liblua-so.patch: New file.
* gnu/packages/lua.scm (lua-5.2): Use lua52-liblua-so.patch.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/lua.scm

@@ -37,7 +37,8 @@
                                  version ".tar.gz"))
              (sha256
               (base32 "0b8034v1s82n4dg5rzcn12067ha3nxaylp2vdp8gg08kjsbzphhk"))
-             (patches (list (search-patch "lua-pkgconfig.patch")))))
+             (patches (list (search-patch "lua-pkgconfig.patch")
+                            (search-patch "lua52-liblua-so.patch")))))
     (build-system gnu-build-system)
     (inputs `(("readline", readline)))
     (arguments

gnu/packages/patches/lua52-liblua-so.patch

@@ -0,0 +1,78 @@
+From 7a1b4e0829124976878ca2765a8e546667a92ceb Mon Sep 17 00:00:00 2001
+From: Leo Famulari <leo@famulari.name>
+Date: Fri, 30 Oct 2015 19:11:31 -0400
+Subject: [PATCH] apply existing non-executable library patch and install
+ libraries as executable
+
+---
+ Makefile     | 6 +++---
+ src/Makefile | 8 +++++++-
+ 2 files changed, 10 insertions(+), 4 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index 1aea8e6..bfcfed9 100644
+--- a/Makefile
++++ b/Makefile
+@@ -44,7 +44,7 @@ INTERPRETER= lua
+ COMPILER= luac
+ TO_BIN= $(INTERPRETER) $(COMPILER)
+ TO_INC= lua.h luaconf.h lualib.h lauxlib.h lua.hpp
+-TO_LIB= liblua.a
++TO_LIB= liblua.a liblua.so liblua.so.${V}
+ TO_PC=  lua-$(V).pc
+ TO_MAN= lua.1 luac.1
+ 
+@@ -56,7 +56,7 @@ R= $V.3
+ all:	$(PLAT)
+ 
+ $(PLATS):
+-	cd src && $(MAKE) $@
++	cd src && $(MAKE) $@ V=$(V) R=$(R)
+ 
+ clean:
+ 	cd src && $(MAKE) $@
+@@ -69,7 +69,7 @@ install: dummy $(TO_PC)
+ 	cd src && $(MKDIR) $(INSTALL_BIN) $(INSTALL_INC) $(INSTALL_LIB) $(INSTALL_PC) $(INSTALL_MAN) $(INSTALL_LMOD) $(INSTALL_CMOD)
+ 	cd src && $(INSTALL_EXEC) $(TO_BIN) $(INSTALL_BIN)
+ 	cd src && $(INSTALL_DATA) $(TO_INC) $(INSTALL_INC)
+-	cd src && $(INSTALL_DATA) $(TO_LIB) $(INSTALL_LIB)
++	cd src && $(INSTALL_EXEC) $(TO_LIB) $(INSTALL_LIB)
+ 	cd src && $(INSTALL_DATA) ../$(TO_PC) $(INSTALL_PC)
+ 	cd doc && $(INSTALL_DATA) $(TO_MAN) $(INSTALL_MAN)
+ 
+diff --git a/src/Makefile b/src/Makefile
+index 7b4b2b7..c86476e 100644
+--- a/src/Makefile
++++ b/src/Makefile
+@@ -29,6 +29,7 @@ MYOBJS=
+ PLATS= aix ansi bsd freebsd generic linux macosx mingw posix solaris
+ 
+ LUA_A=	liblua.a
++LUA_SO= liblua.so
+ CORE_O=	lapi.o lcode.o lctype.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o \
+ 	lmem.o lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o \
+ 	ltm.o lundump.o lvm.o lzio.o
+@@ -43,7 +44,7 @@ LUAC_T=	luac
+ LUAC_O=	luac.o
+ 
+ ALL_O= $(BASE_O) $(LUA_O) $(LUAC_O)
+-ALL_T= $(LUA_A) $(LUA_T) $(LUAC_T)
++ALL_T= $(LUA_A) $(LUA_T) $(LUAC_T) $(LUA_SO)
+ ALL_A= $(LUA_A)
+ 
+ # Targets start here.
+@@ -55,6 +56,11 @@ o:	$(ALL_O)
+ 
+ a:	$(ALL_A)
+ 
++$(LUA_SO): $(CORE_O) $(LIB_O)
++	$(CC) -shared -ldl -Wl,-soname,$(LUA_SO).$(V) -o $@.$(R) $? -lm $(MYLDFLAGS)
++	ln -sf $(LUA_SO).$(R) $(LUA_SO).$(V)
++	ln -sf $(LUA_SO).$(R) $(LUA_SO)
++
+ $(LUA_A): $(BASE_O)
+ 	$(AR) $@ $(BASE_O)
+ 	$(RANLIB) $@
+-- 
+2.6.1
+