Makefile error calling sed with comment character
I am trying to create lstrip
, a Lua utility to compress Lua source code. I am trying to build for Lua 5.1.3 OS X v10.10.3.
I downloaded and extracted the Lua 5.1.3 source code and modified the Makefile lstrip
to point to this directory. However, when I run make
I get this output:
cc -I/usr/local/src/lua-5.1.3/src -I/usr/local/src/lua-5.1.3/src -O2 -Wall -Wextra -O2 -c -o lstrip.o lstrip.c lstrip.c:33:14: warning: unused parameter 'argc' [-Wunused-parameter] int main(int argc, char* argv[]) ^ 1 warning generated. sed '/void luaX_next/i#include "proxy.c"' /usr/local/src/lua-5.1.3/src/llex.c > llex.c sed: 1: "/void luaX_next/i#inclu ...": command i expects \ followed by text make: *** [llex.c] Error 1
This is what the corresponding Makefile command looks like:
llex.c:
sed '/void luaX_next/i#include "proxy.c"' $(LUASRC)/$@ > $@
I think this is because #
sed is being treated like an actual comment in the command, but I'm not sure.
How can I fix the Makefile or manually follow the steps to get it lstrip
?
A complete copy of the Makefile follows in case it matters:
# makefile for lstrip
# change these to reflect your Lua installation (Lua 5.1!)
LUA= /usr/local/src/lua-5.1.3
LUAINC= $(LUA)/src
LUALIB= $(LUA)/src
LUASRC= $(LUA)/src
# no need to change anything below here
CFLAGS= $(INCS) $(WARN) -O2 $G
WARN= -O2 -Wall -Wextra
INCS= -I$(LUAINC) -I$(LUASRC)
LIBS= -L$(LUALIB) -llua -lm
MYNAME= lstrip
MYLIB= $(MYNAME)
T= $(MYNAME)
OBJS= $(MYNAME).o llex.o
TEST= test.lua
all: test
test: $T
$T $(TEST)
$T: $(OBJS)
$(CC) -o $@ $(OBJS) $(LIBS)
llex.c:
sed '/void luaX_next/i#include "proxy.c"' $(LUASRC)/$@ > $@
llex.o: proxy.c
clean:
-rm -f $(OBJS) core core.* a.out $(MYNAME)
# eof
Manual assembly solution:
-
cp /usr/local/src/lua-5.1.3/src/llex.c .
- Hand-modify llex.c to add a line
#include "proxy.c"
before the line starting withvoid luaX_next
(line 446 for me). - Now run
make
that will be successful.
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You can find the answer in the sed manual and it is in the lines of the Makefile
llex.c:
sed '/void luaX_next/i#include "proxy.c"' $(LUASRC)/$@ > $@
This is where some variable expansion happens: $ (LUASRC) expands to the above variable -> $ (LUA) / src. Be careful if necessary. $ @ is replaced with the current target (llex.c)
So this recipe says: To get the target llex.c (which will be processed later through other recipes), apply the stream edit command to the $ LUASRC / llex.c file and write it to llex.c.
Stream edit command: find the text "void luaX_next", before printing it, insert the line "#include" proxy.c "". The problem is that the command for this is not "i" but "i \ (newline)", which contradicts the Makefile's requirement that the recipes must be on one line.
I suspect that you need to use a different command than sed to fix your Makefile; awk can fit the score, although it's a little more complex.
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