MTD 248-645A Manual de usuario descargar pdf (Pagina 108)

Linux From Scratch - Version 7.0

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

mkdir -v ../glibc-build

cd ../glibc-build

As in Chapter 5, add the needed compiler flags to CFLAGS for x86 machines. Here, the optimization of the library

is also set for the gcc compiler to enhance compilation speed (-pipe) and package performance (-O3).

case `uname -m` in

i?86) echo "CFLAGS += -march=i486 -mtune=native -O3 -pipe" > configparms ;;

esac

Prepare Glibc for compilation:

../glibc-2.14.1/configure --prefix=/usr \

--disable-profile --enable-add-ons \

--enable-kernel=2.6.25 --libexecdir=/usr/lib/glibc

The meaning of the new configure options:

--libexecdir=/usr/lib/glibc

This changes the location of the pt_chown program from its default of /usr/libexec to /usr/lib/

glibc.

Compile the package:

make

Important

In this section, the test suite for Glibc is considered critical. Do not skip it under any circumstance.

Before running the tests, copy a file from the source tree into our build tree to prevent a couple of test failures, then

test the results:

cp -v ../glibc-2.14.1/iconvdata/gconv-modules iconvdata

make -k check 2>&1 | tee glibc-check-log

grep Error glibc-check-log

You will probably see an expected (ignored) failure in the posix/annexc test. In addition the Glibc test suite is

somewhat dependent on the host system. This is a list of the most common issues:

• The nptl/tst-clock2, nptl/tst-attr3, and rt/tst-cpuclock2 tests have been known to fail. The reason is not

completely understood, but indications are that minor timing issues can trigger these failures.

• The math tests sometimes fail when running on systems where the CPU is not a relatively new genuine Intel or

authentic AMD processor.

• If you have mounted the LFS partition with the noatime option, the atime test will fail. As mentioned in

Section 2.4, “Mounting the New Partition”, do not use the noatime option while building LFS.

• When running on older and slower hardware or on systems under load, some tests can fail because of test

timeouts being exceeded. Modifying the make check command to set a TIMEOUTFACTOR is reported to help

eliminate these errors (e.g. TIMEOUTFACTOR=16 make -k check).

• Other tests known to fail on some architectures are posix/bug-regex32, misc/tst-writev, elf/check-textrel, nptl/tst-

getpid2, and stdio-common/bug22.

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MTD 248-645A Manual de usuario Pagina 108