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package/glibc: remove mips r6 nan208 hook

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This hook is not needed since glibc 2.23 [1] and can be safely removed.

[1] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=d5f2798a0ac9d5ad8ad7a506a2f840035135e2d2

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
This commit is contained in:
Romain Naour 2017-10-29 12:49:42 +01:00 committed by Thomas Petazzoni
parent b7826807d1
commit 27936318ae
1 changed files with 0 additions and 30 deletions
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package/glibc/glibc.mk
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@ -121,34 +121,4 @@ define GLIBC_INSTALL_TARGET_CMDS
done
endef
# MIPS R6 requires to have NaN2008 support which is currently not
# supported by the Linux kernel. In order to prevent building the
# glibc against kernels not having NaN2008 support on platforms that
# requires it, glibc currently checks for an (inexisting) 10.0.0
# kernel headers version.
#
# Since in practice the kernel support for NaN2008 is not really
# required for things to work properly, we adjust the glibc check to
# make it believe that NaN2008 support was added in the kernel
# starting from version 4.0.0.
#
# In general the compatibility issues introduced by mis-matched NaN
# encodings will not cause a problem as signalling NaNs are rarely used
# in average code. For MIPS R6 there isn't actually any compatibility
# issue as the hardware is always NaN2008 and software is always
# NaN2008. The problem only comes from when older MIPS code is linked in
# via a DSO and multiple NaN encodings are introduced. Since Buildroot
# is intended to have all code built from source then this scenario is
# highly unlikely. The failure mode, if it ever occurs, would be either
# that a signalling NaN fails to raise an invalid operation exception or
# (more likely) an ordinary NaN raises an invalid operation exception.
ifeq ($(BR2_MIPS_CPU_MIPS32R6)$(BR2_MIPS_CPU_MIPS64R6),y)
define GLIBC_FIX_MIPS_R6
$(SED) 's#10.0.0#4.0.0#' \
$(@D)/sysdeps/unix/sysv/linux/mips/configure \
$(@D)/sysdeps/unix/sysv/linux/mips/configure.ac
endef
GLIBC_POST_EXTRACT_HOOKS += GLIBC_FIX_MIPS_R6
endif
$(eval $(autotools-package))