[build] Default to DWARF 4 on Solaris if linker supports CIEv3

Rainer Orth ro@CeBiTec.Uni-Bielefeld.DE
Tue Mar 19 12:34:00 GMT 2013

As described in

	Don't use DWARF 4 on Solaris

the Solaris linker couldn't handle CIEv3 in .eh_frame, so we defaulted
to DWARF 2 on Solaris in any configuration (Sun or GNU ld).  This has
changed in Solaris 11.1, where the necessary support was added.  The
following patch checks for this and defaults to DWARF 4 if either a
sufficiently recent Sun ld or GNU ld >= 2.16 is used.

Bootstrapped without regressions on i386-pc-solaris2.11 (Solaris 11.1)
with Sun ld and gld 2.23.1, and on i386-pc-solaris2.10 with Sun ld.

Ok for mainline?


2013-03-18  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* configure.ac (gcc_cv_ld_eh_frame_ciev3): New test.
	* configure: Regenerate.
	* config.in: Regenerate.
	* config/sol2.c (solaris_override_options): Only enforce DWARF 2

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Rainer Orth, Center for Biotechnology, Bielefeld University

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