Videos: Linking

Linking combines separately compiled objects to form an executable (either statically or dynamically). We look at the various ways that linking is supported and exposed by C and the compilation toolchain.

• Linking 1: Overview   4:17
  A review and overview of separate compilation and linking.

• Linking 2: Declarations and definitions   2:32
  Declaring and defining variables and functions in C.

• Linking 3: Weak and strong symbols   5:57
  How different declaration forms in C lead to weak and strong symbols in object files.

• Linking 4: #include   2:42
  Using the processor and #include to ensure that declarations and uses are consistent across multiple source files.

• Linking 5: static declarations   3:02
  Using static to make a definition local to its C file.

• Linking 6: Static libraries   3:55
  Combining object files into a static-library archive.

• Linking 7: Using static libraries   3:13
  More details on the process of finding objects in an archive for linking.

• Linking 8: Shared libraries   4:27
  Creating and using shared libraries.

• Linking 9: Installed libraries   2:39
  Linking to installed libraries via the -l flag.

• Linking 10: dlopen   5:38
  Using dlopen and dlsym to dynamically access functions from a shared library.

• Linking 11: Interposing via cpp   4:43
  A case study in using various linking tools and techniques to redirect a function call, starting with using cpp macros.

• Linking 12: Interposing via ld   2:21
  Using special linking flags to redirect function calls based on symbol renaming.

• Linking 13: Interposing via LD_PRELOAD   4:38
  Using the LD_PRELOAD flag to redirect function calls based on shared-library substitutions.