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gcc and friends

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GNU C Compiler and its binary utility friends like as, ld, ...

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gcc and friends

  1. 1. © 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. gcc & Friends
  2. 2. 2© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. What to Expect? What is 'gcc'? Internals of 'gcc' How to use 'gcc'? Friends of 'gcc'
  3. 3. 3© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. What is 'gcc'? GNU C Compiler Open Source Compiler for C & C++ Along with standard headers & libraries Rather a collection of tools Corresponding to various compiler stages Various other compilers built using it Cross Compilers for different architectures
  4. 4. 4© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. 'gcc': Internals Decoded Pre Processor ICG (machine independent) ICG (machine dependent) Assembler (as) Linker (ld) .c .i IC(parse trees, ...) .S .o .exe gcc core gcc wrapper gcc -S gcc -c gcc gcc -E
  5. 5. 5© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Using GNU C Compiler gcc file.c → Creates the executable a.out gcc file.c -o file gcc -E file.c → Pre-process only gcc -S file.c → Generate assembly code gcc -c file.c → Create object code gcc -I<hdrs_path> file.c gcc -L<libs_path> file.c -l<lib> gcc -D<define> file.c gcc -On file.c, n = 0, 1, 2, 3, s, fast, g gcc -M file.c gcc -MM file.c gcc -T <linker_script> file.c gcc -Wl,<linker_option> file.c ... (including many architecture specific flags)
  6. 6. 6© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Default Compiler Defines Trick to find out (#gcc #define) gcc -E -dM -xc /dev/null | sort Also gcc -E -dM -xc++ /dev/null | sort gcc -E -dM -xc++ -std=c++0x /dev/null | sort
  7. 7. 7© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Standard Paths Standard Headers Path: /usr/include/ Standard Libraries Path: /usr/lib/ Library Prefix: lib Standard Headers stdio.h, strings.h, math.h, ... Standard Libraries libc, libm, … Where is the code of printf?
  8. 8. 8© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Friends of 'gcc' Preprocessor: cpp Assembler: as Linker: ld Name Lister: nm Disassembler: objdump Archiver: ar Print strings from files: strings ...
  9. 9. 9© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. What all have we learnt? gcc: GNU C Compiler Standard Headers & Libraries Collection of tools Usage of 'gcc' Friends of 'gcc'
  10. 10. 10© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Any Queries?
  11. 11. 11© 2010-15 SysPlay Workshops <workshop@sysplay.in> All Rights Reserved. Advanced Topics Shared library vs Archive Linking, Library Function Call, ... Defining your own headers Creating a shared library Creating an archive

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