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Diffstat (limited to 'manual/install.texi')
| -rw-r--r-- | manual/install.texi | 65 |
1 files changed, 32 insertions, 33 deletions
diff --git a/manual/install.texi b/manual/install.texi index 1656c5e..793cc8d 100644 --- a/manual/install.texi +++ b/manual/install.texi @@ -79,8 +79,9 @@ directory if that option is specified, or @file{/usr/local} otherwise. @item --with-headers=@var{directory} Look for kernel header files in @var{directory}, not -@file{/usr/include}. Glibc needs information from the kernel's private -header files. Glibc will normally look in @file{/usr/include} for them, +@file{/usr/include}. Glibc needs information from the kernel's header +files describing the interface to the kernel. Glibc will normally +look in @file{/usr/include} for them, but if you specify this option, it will look in @var{DIRECTORY} instead. This option is primarily of use on a system where the headers in @@ -393,39 +394,37 @@ patches, although we try to avoid this. @appendixsec Specific advice for GNU/Linux systems @cindex kernel header files -If you are installing GNU libc on a GNU/Linux system, you need to have the -header files from a 2.2 or newer kernel around for reference. For some -architectures, like ia64, sh and hppa, you need at least headers from -kernel 2.3.99 (sh and hppa) or 2.4.0 (ia64). You do not need to use -that kernel, just have its headers where glibc can access at them. The -easiest way to do this is to unpack it in a directory such as -@file{/usr/src/linux-2.2.1}. In that directory, run @samp{make config} -and accept all the defaults. Then run @samp{make -include/linux/version.h}. Finally, configure glibc with the option -@samp{--with-headers=/usr/src/linux-2.2.1/include}. Use the most recent -kernel you can get your hands on. - -An alternate tactic is to unpack the 2.2 kernel and run @samp{make -config} as above; then, rename or delete @file{/usr/include}, create a -new @file{/usr/include}, and make symbolic links of -@file{/usr/include/linux} and @file{/usr/include/asm} into the kernel -sources. You can then configure glibc with no special options. +If you are installing GNU libc on a GNU/Linux system, you need to have +the header files from a 2.6.19.1 or newer kernel around for reference. +These headers must be installed using @samp{make headers_install}; the +headers present in the kernel source directory are not suitable for +direct use by GNU libc. You do not need to use that kernel, just have +its headers installed where glibc can access them, referred to here as +@var{install-directory}. The easiest way to do this is to unpack it +in a directory such as @file{/usr/src/linux-@var{version}}. In that +directory, run @samp{make headers_install +INSTALL_HDR_PATH=@var{install-directory}}. Finally, configure glibc +with the option @samp{--with-headers=@var{install-directory}/include}. +Use the most recent kernel you can get your hands on. (If you are +cross-compiling GNU libc, you need to specify +@samp{ARCH=@var{architecture}} in the @samp{make headers_install} +command, where @var{architecture} is the architecture name used by the +Linux kernel, such as @samp{x86} or @samp{powerpc}.) After installing GNU libc, you may need to remove or rename -@file{/usr/include/linux} and @file{/usr/include/asm}, and replace them -with copies of @file{include/linux} and -@file{include/asm-$@var{ARCHITECTURE}} taken from the Linux source -package which supplied kernel headers for building the library. -@var{ARCHITECTURE} will be the machine architecture for which the -library was built, such as @samp{i386} or @samp{alpha}. You do not need -to do this if you did not specify an alternate kernel header source -using @samp{--with-headers}. The intent here is that these directories -should be copies of, @strong{not} symlinks to, the kernel headers used to -build the library. - -Note that @file{/usr/include/net} and @file{/usr/include/scsi} should -@strong{not} be symlinks into the kernel sources. GNU libc provides its -own versions of these files. +directories such as @file{/usr/include/linux} and +@file{/usr/include/asm}, and replace them with copies of directories +such as @file{linux} and @file{asm} from +@file{@var{install-directory}/include}. All directories present in +@file{@var{install-directory}/include} should be copied, except that +GNU libc provides its own version of @file{/usr/include/scsi}; the +files provided by the kernel should be copied without replacing those +provided by GNU libc. The @file{linux}, @file{asm} and +@file{asm-generic} directories are required to compile programs using +GNU libc; the other directories describe interfaces to the kernel but +are not required if not compiling programs using those interfaces. +You do not need to copy kernel headers if you did not specify an +alternate kernel header source using @samp{--with-headers}. GNU/Linux expects some components of the libc installation to be in @file{/lib} and some in @file{/usr/lib}. This is handled automatically |