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### C.1 Requirements for Building GDB

Building GDB requires various tools and packages to be available. Other packages will be used only if they are found.

### Tools/Packages Necessary for Building GDB

C`++`11 compiler

  GDB is written in C`++`11. It should be buildable with any recent C`++`11 compiler, e.g. GCC.

GNU make

  GDB’s build system relies on features only found in the GNU make program. Other variants of `make` will not work.

### Tools/Packages Optional for Building GDB

Expat

  GDB can use the Expat XML parsing library. This library may be included with your operating system distribution; if it is not, you can get the latest version from http://expat.sourceforge.net. The `configure` script will search for this library in several standard locations; if it is installed in an unusual path, you can use the `--with-libexpat-prefix` option to specify its location.

  Expat is used for:

  - Remote protocol memory maps (see Memory Map Format)
  - Target descriptions (see Target Descriptions)
  - Remote shared library lists (See Library List Format, or alternatively see Library List Format for SVR4 Targets)
  - MS-Windows shared libraries (see Shared Libraries)
  - Traceframe info (see Traceframe Info Format)
  - Branch trace (see Branch Trace Format, see Branch Trace Configuration Format)
Guile

  GDB can be scripted using GNU Guile. See Guile. By default, GDB will be compiled if the Guile libraries are installed and are found by `configure`. You can use the `--with-guile` option to request Guile, and pass either the Guile version number or the file name of the relevant `pkg-config` program to choose a particular version of Guile.

iconv

  GDB’s features related to character sets (see Character Sets) require a functioning `iconv` implementation. If you are on a GNU system, then this is provided by the GNU C Library. Some other systems also provide a working `iconv`.

  If GDB is using the `iconv` program which is installed in a non-standard place, you will need to tell GDB where to find it. This is done with `--with-iconv-bin` which specifies the directory that contains the `iconv` program. This program is run in order to make a list of the available character sets.

  On systems without `iconv`, you can install GNU Libiconv. If Libiconv is installed in a standard place, GDB will automatically use it if it is needed. If you have previously installed Libiconv in a non-standard place, you can use the `--with-libiconv-prefix` option to `configure`.

  GDB’s top-level `configure` and `Makefile` will arrange to build Libiconv if a directory named `libiconv` appears in the top-most source directory. If Libiconv is built this way, and if the operating system does not provide a suitable `iconv` implementation, then the just-built library will automatically be used by GDB. One easy way to set this up is to download GNU Libiconv, unpack it inside the top-level directory of the GDB source tree, and then rename the directory holding the Libiconv source code to ‘`libiconv`’.

lzma

  GDB can support debugging sections that are compressed with the LZMA library. See MiniDebugInfo. If this library is not included with your operating system, you can find it in the xz package at http://tukaani.org/xz/. If the LZMA library is available in the usual place, then the `configure` script will use it automatically. If it is installed in an unusual path, you can use the `--with-lzma-prefix` option to specify its location.

MPFR

  GDB can use the GNU MPFR multiple-precision floating-point library. This library may be included with your operating system distribution; if it is not, you can get the latest version from http://www.mpfr.org. The `configure` script will search for this library in several standard locations; if it is installed in an unusual path, you can use the `--with-libmpfr-prefix` option to specify its location.

  GNU MPFR is used to emulate target floating-point arithmetic during expression evaluation when the target uses different floating-point formats than the host. If GNU MPFR it is not available, GDB will fall back to using host floating-point arithmetic.

Python

  GDB can be scripted using Python language. See Python. By default, GDB will be compiled if the Python libraries are installed and are found by `configure`. You can use the `--with-python` option to request Python, and pass either the file name of the relevant `python` executable, or the name of the directory in which Python is installed, to choose a particular installation of Python.

zlib

  GDB will use the ‘`zlib`’ library, if available, to read compressed debug sections. Some linkers, such as GNU gold, are capable of producing binaries with compressed debug sections. If GDB is compiled with ‘`zlib`’, it will be able to read the debug information in such binaries.

  The ‘`zlib`’ library is likely included with your operating system distribution; if it is not, you can get the latest version from http://zlib.net.

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