Define various symbols conditionally in shared libraries executables

[Nick Clifton]

Hi Wilco,

> ..binutils/ld/ld-new:built in linker script:160: syntax error
> 
> There are around 300 of these. Do you have an idea which builtin script this is?

The exact script used depends upon the command line options used to invoke
the linker.  In this particular case it appears that the problem is triggered
by the "-shared" option:

  % ./ld-new --verbose --shared
  GNU ld (GNU Binutils) 2.30.52.20180612
  ./ld-new:built in linker script:160: syntax error

This translates to:

  % cat aarch64elf.xsc
  [...]
  PROVIDE (_bss_end__ = .); __bss_end__ = .);

Where you can see that there is an extraneous closing parenthesis.
(The extension for the script file can be found in the comments in
the ld/genscripts.sh script in the linker sources.  The script files
themselves can be found in the ld/ldscripts/ directory in your build
tree).

The script itself is the ld/scriptempl/elf.sc file in the linker sources
although the line in question is actually the invocation of the 
OTHER_BSS_END_SYMBOLS macro which, for the aarch64, is defined in
ld/emulparams/aarch64elf.sh.  It appears that the problem is a simple
typo:

OTHER_BSS_END_SYMBOLS="${CREATE_SHLIB+PROVIDE (}_bss_end__ = .${CREATE_SHLIB+)}; __bss_end__ = .${CREATE_SHLIB+)};"

The definition of the __bss_end__ symbol should be conditional upon CREATE_SHLIB
being defined.  (As is done for the _bss_end__ symbol).

So I am checking in the obvious patch to fix this.

Cheers
  Nick

ld/ChangeLog
2018-06-12  Nick Clifton  <nickc@redhat.com>

	* emulparams/aarch64elf.sh (OTHER_BSS_END_SYMBOLS): Make the
	definition of the __bss_end__ symbol conditional upon CREATE_SHLIB.

diff --git a/ld/emulparams/aarch64elf.sh b/ld/emulparams/aarch64elf.sh
index deea7b4610..4a59342722 100644
--- a/ld/emulparams/aarch64elf.sh
+++ b/ld/emulparams/aarch64elf.sh
@@ -29,7 +29,7 @@ DATA_START_SYMBOLS="${CREATE_SHLIB+PROVIDE (}__data_start = .${CREATE_SHLIB+)};"
 NO_SMALL_DATA=yes
 
 OTHER_BSS_SYMBOLS="${CREATE_SHLIB+PROVIDE (}__bss_start__ = .${CREATE_SHLIB+)};"
-OTHER_BSS_END_SYMBOLS="${CREATE_SHLIB+PROVIDE (}_bss_end__ = .${CREATE_SHLIB+)}; __bss_end__ = .${CREATE_SHLIB+)};"
+OTHER_BSS_END_SYMBOLS="${CREATE_SHLIB+PROVIDE (}_bss_end__ = .${CREATE_SHLIB+)}; ${CREATE_SHLIB+PROVIDE (}__bss_end__ = .${CREATE_SHLIB+)};"
 OTHER_END_SYMBOLS="${CREATE_SHLIB+PROVIDE (}__end__ = .${CREATE_SHLIB+)};"
 
 OTHER_SECTIONS='.note.gnu.arm.ident 0 : { KEEP (*(.note.gnu.arm.ident)) }'