Gcc

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Gcc

  1. 1. GCC on Linux The beast and it's taming Mark Veltzer mark.veltzer@gmail.com
  2. 2. Getting data from stdin ● Input file would be - ● You have to specify the input language using the -x flag ● Possible values include: c,c++,objective- c,objective-c++,assembler,assembler-with- cpp,ada,f77,f95,java and many more ● Example: gcc -x c - ● Output file either specified with -o or would be the standard (a.out).
  3. 3. Getting help ● man gcc – good for quick reference to flags ● Info gcc – more in depth (warning: entire book!) ● gcc – help – only most common flags but good for 99% of the cases (two minuses!) ● gcc –target-help – shows options that have to do with target code generation ● gcc –help=warnings – shows all warning flags
  4. 4. What version of gcc are you running? ● On the command line you can use the following ● gcc –version – first line shows the compiler version ● gcc -v – more info (including threading model, configuration and ● Or you can use your package management utilities to determine the version of the gcc package ● In your source code (TODO)
  5. 5. What version of gcc are you running? ● In your source code you can use the following macros ● __VERSION__ - has the compiler version you are using as a string ● __GXX_ABI_VERSION – has the C++ ABI version that the current compiler implements ● linux, __linux, __linux__, unix, __unix, __unix__, __gnu_linux__ are defined symbols
  6. 6. What version of gcc are you running? (cont) ● __GNUC__ - is your compilers major version number ● __GNUC_MINOR__ - has the minor version of your compiler ● __GNUC_PATCHLEVEL__ - has the patch level of your compiler
  7. 7. The preprocessor ● cpp on the command line ● echo | g[cc|++] -E -dM - - will dump your preprocessors defined symbols for C

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