Cross-Compiled Linux From Scratch - Version 1.2.0-x86_64-Multilib

Chapter 10. Installing Basic System Software

10.23. GCC-4.6.0

The GCC package contains the GNU compiler collection, which includes the C and C++ compilers.

10.23.1. Installation of GCC

The following patch contains a number of updates to the 4.6.0 branch by the GCC developers: 

patch -Np1 -i ../gcc-4.6.0-branch_update-1.patch

Apply a sed substitution that will suppress the installation of libiberty.a. The version of libiberty.a provided by Binutils will be used instead: 

sed -i 's/install_to_$(INSTALL_DEST) //' libiberty/Makefile.in

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

mkdir -v ../gcc-build
cd ../gcc-build

Prepare GCC for compilation: 

CC="gcc -isystem /usr/include ${BUILD64}" \
CXX="g++ -isystem /usr/include ${BUILD64}" \
LDFLAGS="-Wl,-rpath-link,/usr/lib64:/lib64:/usr/lib:/lib" \
  ../gcc-4.6.0/configure --prefix=/usr --libdir=/usr/lib64 \
    --libexecdir=/usr/lib64 --enable-shared --enable-threads=posix \
    --enable-__cxa_atexit --enable-c99 --enable-long-long \
    --enable-clocale=gnu --enable-languages=c,c++ --disable-libstdcxx-pch

Compile the package: 

make
[Important]

Important

The test suite for GCC is considered critical. Do not skip it under any circumstance.

Test the results, but do not stop at errors: 

make -k check

The -k flag is used to make the test suite run through to completion and not stop at the first failure. The GCC test suite is very comprehensive and is almost guaranteed to generate a few failures. To receive a summary of the test suite results, run: 

../gcc-4.6.0/contrib/test_summary

For only the summaries, pipe the output through grep -A7 Summ.

A few unexpected failures cannot always be avoided. The GCC developers are usually aware of these issues, but have not resolved them yet.

Install the package: 

make install

Some packages expect the C preprocessor to be installed in the /lib directory. To support those packages, create this symlink: 

ln -sv ../usr/bin/cpp /lib

Many packages use the name cc to call the C compiler. To satisfy those packages, create a symlink: 

ln -sv gcc /usr/bin/cc

10.23.2. Contents of GCC

Installed programs: c++, cc (link to gcc), cpp, g++, gcc, gccbug, and gcov
Installed libraries: libgcc.a, libgcc_eh.a, libgcc_s.so, libgcov.a, libgomp.[a,so], libmudflap.[a,so], libmudflapth.[a,so], libssp.[a,so], libssp_nonshared.a, libstdc++.[a,so], and libsupc++.a
Installed directories: /usr/include/c++, /usr/lib/gcc

Short Descriptions

cc

The C compiler

cpp

The C preprocessor; it is used by the compiler to expand the #include, #define, and similar statements in the source files

c++

The C++ compiler

g++

The C++ compiler

gcc

The C compiler

gccbug

A shell script used to help create useful bug reports

gcov

A coverage testing tool; it is used to analyze programs to determine where optimizations will have the most effect

libgcc

Contains run-time support for gcc

libgcov

Library that is linked into a program when gcc is instructed to enable profiling

libgomp

GNU implementation of the OpenMP API for multi-platform shared-memory parallel programming in C/C++ and Fortran

libmudflap

The libmudflap libraries are used by GCC for instrumenting pointer and array dereferencing operations.

libssp

Contains routines supporting GCC's stack-smashing protection functionality

libstdc++

The standard C++ library

libsupc++

Provides supporting routines for the C++ programming language