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ld.so.8: Document effect of hwcaps on search path 

Wording by Aurelien Jarno from Debian glibc's r4701 (2011-06-04).

Addresses http://bugs.debian.org/622385

Reported-by: Reuben Thomas <rrt@sc3d.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Jonathan Nieder 2012-04-17 08:38:16 +12:00 committed by Michael Kerrisk
parent 6f92d1d707
commit de1f0d4764
1 changed files with 36 additions and 0 deletions
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@ -64,6 +64,8 @@ in the augmented library path.
If, however, the binary was linked with the
.B \-z nodeflib
linker option, libraries in the default library paths are skipped.
Libraries installed in hardware capability directories (see below)
are preferred to other libraries.
.IP o
In the default path
.IR /lib ,
@ -129,6 +131,40 @@ is set-user-ID or set-group-ID.
.TP
.B \-\-audit LIST
Use objects named in LIST as auditors.
.SH HARDWARE CAPABILITIES
Some libraries are compiled using hardware-specific instructions which do
not exist on every CPU.
Such libraries should be installed in directories whose names define the
required hardware capabilities, such as
.IR /usr/lib/sse2/ .
The dynamic linker checks these directories against the hardware of the
machine and selects the most suitable version of a given library.
Hardware capability directories can be cascaded to combine CPU features.
The list of supported hardware capability names depends on the CPU.
The following names are currently recognized:
.TP
.B Alpha
ev4, ev5, ev56, ev6, ev67
.TP
.B MIPS
loongson2e, loongson2f, octeon, octeon2
.TP
.B PowerPC
4xxmac, altivec, arch_2_05, arch_2_06, booke, cellbe, dfp, efpdouble, efpsingle,
fpu, ic_snoop, mmu, notb, pa6t, power4, power5, power5+, power6x, ppc32, ppc601,
ppc64, smt, spe, ucache, vsx
.TP
.B SPARC
flush, muldiv, stbar, swap, ultra3, v9, v9v, v9v2
.TP
.B s390
dfp, eimm, esan3, etf3enh, g5, highgprs, hpage, ldisp, msa, stfle,
z900, z990, z9-109, z10, zarch
.TP
.TP
.B x86 (32-bit only)
acpi, apic, clflush, cmov, cx8, dts, fxsr, ht, i386, i486, i586, i686, mca, mmx,
mtrr, pat, pbe, pge, pn, pse36, sep, ss, sse, sse2, tm
.SH ENVIRONMENT
There are four important environment variables.
.TP