[testsuite, i386] Change mpx effective-target test into link test

[Rainer Orth]

Currently, the new gcc.dg/lto/chkp-privatize test FAILs on Solaris/x86
with gas and ld for 64-bit:

UNRESOLVED: gcc.dg/lto/chkp-privatize c_lto_chkp-privatize_0.o-c_lto_chkp-privatize_1.o execute  -fPIC -flto -flto-partition=max -fcheck-pointer-bounds -mmpx 
FAIL: gcc.dg/lto/chkp-privatize c_lto_chkp-privatize_0.o-c_lto_chkp-privatize_1.o link,  -fPIC -flto -flto-partition=max -fcheck-pointer-bounds -mmpx 

output is:
ld: fatal: relocation error: file c_lto_chkp-privatize_0.o: section [4].rela.text: invalid relocation type: 0x28
ld: fatal: symbol referencing errors
collect2: error: ld returned 1 exit status

This relocation type 0x28 (40) is R_X86_64_PLT32_BND, which Solaris 10
and 11 ld know nothing about.

Given that there's no test whatsoever in gcc/configure.ac that the whole
toolchain supports the necessary mnemonics and relocs, the logical place
seems to be the testsuite.

The following patch does just that, turning the mpx effective-target
test into a link test, thus checking both assembler and linker used.

Tested with the appropriate runtest invocations on i386-pc-solaris2.11
with as/ld (both 32 and 64-bit tests unsupported due to missing
assembler support), gas/ld (32-bit tests pass, 64-bit tests unsupported
due to missing linker support), and x86_64-unknown-linux-gnu (both 32
and 64-bit tests pass).

I wonder what's the point of having mpx-dg.exp at all: I'd rather move
the single test to target-supports.exp, avoiding the whole flurry of
mpx-dg.exp inclusions all over gcc/testsuite.  Ilya?  However that may
be, it can be done as a followup.

Ok for mainline?

	Rainer


2014-12-18  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* lib/mpx-dg.exp (check_effective_target_mpx): Change into link test.
	Add main.

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Rainer Orth, Center for Biotechnology, Bielefeld University