5.12. GCC-4.3.2 - Pass 2

5.12.1. Re-installation of GCC

The tools required to test GCC and Binutils—Tcl, Expect and DejaGNU—are installed now. GCC and Binutils can now be rebuilt, linking them against the new Glibc and testing them properly (if running the test suites in this chapter). Please note that these test suites are highly dependent on properly functioning PTYs which are provided by the host. PTYs are most commonly implemented via the devpts file system. Check to see if the host system is set up correctly in this regard by performing a quick test:

expect -c "spawn ls"

The response might be:

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

If the above message is received, the host does not have its PTYs set up properly. In this case, there is no point in running the test suites for GCC and Binutils until this issue is resolved. Please consult the LFS FAQ at http://www.linuxfromscratch.org//lfs/faq.html#no-ptys for more information on how to get PTYs working.

As previously explained in Section 5.8, “Adjusting the Toolchain”, under normal circumstances the GCC fixincludes script is run in order to fix potentially broken header files. As GCC-4.3.2 and Glibc-2.8-20080929 have already been installed at this point, and their respective header files are known to not require fixing, the fixincludes script is not required. As mentioned previously, the script may in fact pollute the build environment by installing fixed headers from the host system into GCC's private include directory. The running of the fixincludes script can be suppressed by issuing the following commands:

cp -v gcc/Makefile.in{,.orig}
sed 's@\./fixinc\.sh@-c true@' gcc/Makefile.in.orig > gcc/Makefile.in

The bootstrap build performed in Section 5.5, “GCC-4.3.2 - Pass 1” built GCC with the -fomit-frame-pointer compiler flag. Non-bootstrap builds omit this flag by default, so apply the following sed to use it in order to ensure consistent compiler builds:

cp -v gcc/Makefile.in{,.tmp}
sed 's/^XCFLAGS =$/& -fomit-frame-pointer/' gcc/Makefile.in.tmp \
  > gcc/Makefile.in

The following command will change the location of GCC's default dynamic linker to use the one we installed in /tools. It also removes /usr/include from GCC's include search path. Doing this now rather than adjusting the specs file after installation ensures that the new dynamic linker is used during the actual build of GCC. That is, all of the binaries created during the build will link against the new Glibc. Issue:

for file in $(find gcc/config -name linux64.h -o -name linux.h)
do
  cp -uv $file{,.orig}
  sed -e 's@/lib\(64\)\?\(32\)\?/ld@/tools&@g' \
  -e 's@/usr@/tools@g' $file.orig > $file
  echo "
#undef STANDARD_INCLUDE_DIR
#define STANDARD_INCLUDE_DIR 0" >> $file
  touch $file.orig
done

In case the above seems hard to follow, let's break it down a bit. First we find all the files under the gcc/config directory that are named either linux.h or linux64.h. For each file found, we copy it to a file of the same name but with an added suffix of “.orig”. Then the first sed expression prepends “/tools” to every instance of “/lib/ld”, “/lib64/ld” or “/lib32/ld”, while the second one replaces hard-coded instances of “/usr”. Then we add our define statements which alter the include search path to the end of the file. Finally, we use touch to update the timestamp on the copied files. When used in conjunction with cp -u, this prevents unexpected changes to the original files in case the command is inadvertently run twice.

As in the first build of GCC it requires the GMP and MPFR packages. Unpack the tarballs and move them into the required directory names:

tar -jxf ../mpfr-2.3.2.tar.bz2
mv mpfr-2.3.2 mpfr
tar -jxf ../gmp-4.2.4.tar.bz2
mv gmp-4.2.4 gmp

Create a separate build directory again:

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

Before starting to build GCC, remember to unset any environment variables that override the default optimization flags.

Now prepare GCC for compilation:

../gcc-4.3.2/configure --prefix=/tools \
    --with-local-prefix=/tools --enable-clocale=gnu \
    --enable-shared --enable-threads=posix \
    --enable-__cxa_atexit --enable-languages=c,c++ \
    --disable-libstdcxx-pch --disable-bootstrap

Compile the package:

make

Compilation is now complete. As previously mentioned, running the test suites for the temporary tools compiled in this chapter is not mandatory. To run the GCC test suite anyway, use the following command:

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.

For a discussion of test failures that are of particular importance, please see Section 6.14, “GCC-4.3.2.”

Install the package:

make install