Similar to what we do on other architectures with .eh_frame. Reduces the growth when compiling kernels with clang.
Index: arch/arm/conf/ldscript.tail =================================================================== RCS file: /cvs/src/sys/arch/arm/conf/ldscript.tail,v retrieving revision 1.4 diff -u -p -r1.4 ldscript.tail --- arch/arm/conf/ldscript.tail 27 Jun 2009 14:44:39 -0000 1.4 +++ arch/arm/conf/ldscript.tail 26 Oct 2017 15:29:41 -0000 @@ -49,5 +49,9 @@ _end = .; _bss_end__ = . ; __bss_end__ = . ; __end__ = . ; PROVIDE (end = .); + /DISCARD/ : + { + *(.ARM.exidx) + } }