Linux From Scratch - Version 6.0

Chapter 6. Installing Basic System Software

6.13. Binutils-2.15.91.0.2

The Binutils package contains a linker, an assembler, and other tools for handling object files.

Approximate build time: 1.4 SBU

Required disk space: 167 MB

Binutils installation depends on: Bash, Coreutils, Diffutils, GCC, Gettext, Glibc, Grep, Make, Perl, Sed, and Texinfo

6.13.1. Installation of Binutils

This package is known to have issues when its default optimization flags (including the -march and -mcpu options) are changed. If any environment variables that override default optimizations have been defined, such as CFLAGS and CXXFLAGS, unset them when building Binutils.

Verify that the PTYs are working properly inside the chroot environment. Check that everything is set up correctly by performing a simple test: 

expect -c "spawn ls"

If the following message shows up, the chroot environment is not set up for proper PTY operation: 

The system has no more ptys.  
Ask your system administrator to create more.

This issue needs to be resolved before running the test suites for Binutils and GCC.

The Binutils documentation recommends building Binutils outside of the source directory in a dedicated build directory: 

mkdir ../binutils-build
cd ../binutils-build

Prepare Binutils for compilation: 

../binutils-2.15.91.0.2/configure --prefix=/usr \
    --enable-shared

Compile the package: 

make tooldir=/usr

Normally, the tooldir (the directory where the executables will ultimately be located) is set to $(exec_prefix)/$(target_alias), which expands into /usr/i686-pc-linux-gnu. Because this is a custom system, this target-specific directory in /usr is not required. This setup would be used if the system was used to cross-compile (for example, compiling a package on an Intel machine that generates code that can be executed on PowerPC machines).

[Important]

Important

The test suite for Binutils in this section is considered critical. Do not skip it under any circumstances.

Test the results: 

make check

Install the package: 

make tooldir=/usr install

Install the libiberty header file that is needed by some packages: 

cp ../binutils-2.15.91.0.2/include/libiberty.h /usr/include

6.13.2. Contents of Binutils

Installed programs: addr2line, ar, as, c++filt, gprof, ld, nm, objcopy, objdump, ranlib, readelf, size, strings, and strip

Installed libraries: libiberty.a, libbfd.[a,so], and libopcodes.[a,so]

Short Descriptions

addr2line

Translates program addresses to file names and line numbers; given an address and the name of an executable, it uses the debugging information in the executable to determine which source file and line number are associated with the address

ar

Creates, modifies, and extracts from archives

as

An assembler that assembles the output of gcc into object files

c++filt

Used by the linker to de-mangle C++ and Java symbols and to keep overloaded functions from clashing

gprof

Displays call graph profile data

ld

A linker that combines a number of object and archive files into a single file, relocating their data and tying up symbol references

nm

Lists the symbols occurring in a given object file

objcopy

Translates one type of object file into another

objdump

Displays information about the given object file, with options controlling the particular information to display; the information shown is useful to programmers who are working on the compilation tools

ranlib

Generates an index of the contents of an archive and stores it in the archive; the index lists all of the symbols defined by archive members that are relocatable object files

readelf

Displays information about ELF type binaries

size

Lists the section sizes and the total size for the given object files

strings

Outputs, for each given file, the sequences of printable characters that are of at least the specified length (defaulting to four); for object files, it prints, by default, only the strings from the initializing and loading sections while for other types of files, it scans the entire file

strip

Discards symbols from object files

libiberty

Contains routines used by various GNU programs, including getopt, obstack, strerror, strtol, and strtoul

libbfd

The Binary File Descriptor library

libopcodes

A library for dealing with opcodes—the “readable text” versions of instructions for the processor; it is used for building utilities like objdump.