diff options
Diffstat (limited to 'package/glibc')
| -rw-r--r-- | package/glibc/glibc.mk | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/package/glibc/glibc.mk b/package/glibc/glibc.mk index cbfbf32063..e60575f62b 100644 --- a/package/glibc/glibc.mk +++ b/package/glibc/glibc.mk @@ -121,4 +121,34 @@ 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 ($(BR2_mips_32r6)$(BR2_mips_64r6),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)) |
