"globalization" of USE="xattr" causes fail of recompile gcc

[UlvHare]

After the recent mainstream putting +xattr to global profile I've tried to recompile my gcc (4.9.3). It failed with:

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Fixing .la files
   usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/libgfortran.la
   usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/32/libgfortran.la
!!! Failed to copy extended attributes. In order to avoid this error,
!!! set FEATURES="-xattr" in make.conf.
!!! copy /var/tmp/portage/sys-devel/gcc-4.9.3/image/usr/libexec/gcc/x86_64-pc-linux-gnu/4.9.3/cc1 -> /usr/libexec/gcc/x86_64-pc-linux-gnu/4.9.3/cc1 failed.
!!! Filesystem containing file '/usr/libexec/gcc/x86_64-pc-linux-gnu/4.9.3/cc1#new' does not support extended attribute 'user.pax.flags'

Reinstalling portage with USE="-xattr" solved the problem.

[EmaRsk]

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!!! Filesystem […] does not support extended attribute […]

Xattr capabilities are disabled in your filesystem (i.e. it's a kernel config issue).

[quad]

On my systems the extented attributes were built into the kernel, but I had to add the user_xattr mount option to the affected filesystem using /etc/fstab.

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$ zgrep XATTR /proc/config.gz 
CONFIG_EXT2_FS_XATTR=y
CONFIG_EXT3_FS_XATTR=y
CONFIG_REISERFS_FS_XATTR=y
CONFIG_TMPFS_XATTR=y
# CONFIG_SQUASHFS_XATTR is not set
# CONFIG_AUFS_XATTR is not set
CONFIG_CIFS_XATTR=y
$ mount | grep /usr
/dev/sda8 on /usr type reiserfs (rw,noatime,user_xattr)

You can fix the filesystem without rebooting with: mount -o remount,user_xattr /usr

After that, gcc was updated successfully.