Microsoft Word - iOSAppReverseEngineering.docx

² Link Mach-O Objects

iOSREProject_LDFLAGS = - lx

Theos use GNU Linker to link Mach-O objects, including .dylib, .a and .o files. Input “man

ld” in Terminal and locate to “-lx”, it is described as follows:

“-lx This option tells the linker to search for libx.dylib or libx.a in the library search

path. If string x is of the form y.o, then that file is searched for in the same places, but

without prepending lib' or appending.a' or `.dylib' to the filename.”

As shown in figure 3-3, all Mach-O objects are named in the formats of “libx.dylib” and

“y.o”, who’re fully compatible with GNU Linker.

Figure 3- 3 Link Mach-O Objects

So, linking Mach-O objects becomes convenient. For example, if you want to link

libsqlite3.0.dylib, libz.dylib and dylib1.o, you can do it like this:

iOSREProject_LDFLAGS = - lz – lsqlite3.0 – dylib1.o

There is still one more field to introduce later, but without it Makefile is good to work for

now. For more Makefile introductions, you can refer to

Tweak.xm

The default source file of a tweak project created by Theos is Tweak.xm. “x” in “xm”