testsuite: Fix various scan-assembler-symbol-section issues

testsuite: Fix various scan-assembler-symbol-section issues

This patch addresses some of the issues that I found when looking into the
failures of the scan-assembler-symbol-section tests on Solaris/SPARC.

* The first issue was that on Solaris/SPARC, section names are
  double-quoted, both with as and gas:

        .section        ".text"

  When using as, the section flag and type syntax is completely
  different from other ELF targets:

        .section        "my_named_section",#alloc,#execinstr,#progbits

  This patch fixes this by stripping double quotes from section names.

* However, this didn't work initially (only the leading quote was
  stripped), which is due to David's recent AIX patch: with the
  introduction of the new capturing group to handle both .section (ELF)
  and .csect (XCOFF), $full_section_directive would never be empty on
  ELF and Mach-O targets, so the extraction of the section name didn't
  work any longer.  This had also broken the Darwin tests completely.

* With working double quote stripping, all but one of the tests PASSed
  on Solaris/SPARC, the exception being:

FAIL: gcc.dg/20021029-1.c scan-assembler-symbol-section symbol ar (found __sparc_get_pc_thunk.l7) has section ^\\\\.(const|rodata)|\\\\[RO\\\\] (found .text.__sparc_get_pc_thunk.l7%__sparc_get_pc_thunk.l7)

  This is due to the symbol name (ar) not being anchored in the test and
  unexpectedly matchting __sparc_get_pc_thunk.l7.

* Next, I ran the tests on Darwin 11 and found two failing tests:

FAIL: gcc.dg/darwin-sections.c scan-assembler-symbol-section symbol ^_a\$ (symbol not found) has section \\\\.data
FAIL: gcc.dg/darwin-sections.c scan-assembler-symbol-section symbol ^_b\$ (symbol not found) has section \\\\.data

  is due to Iain's recent "Darwin : Begin rework of zero-fill sections."
  patch which emits

        .globl _a
        .zerofill __DATA,__common,_a,1,0

  This is already scanned for, so the two scans above can just go.

  The other failing test is

FAIL: g++.dg/gomp/tls-5.C  -std=c++14  scan-assembler-symbol-section symbol ^_?_ZGR2ir_\$ (symbol not found) has section ^\\\\.tdata|\\\\[TL\\\\]
FAIL: g++.dg/gomp/tls-5.C  -std=c++14  scan-assembler-symbol-section symbol ^_?ir\$ (symbol not found) has section ^\\\\.tbss|\\\\[TL\\\\]

  Other scans are guarded by target tls_native, and indeed the assembler
  output has

___emutls_v._ZGR2ir_:
___emutls_t._ZGR2ir_:

___emutls_v.ir:

  Unfortunately scan-assembler-symbol-section doesn't support selects
  yet, which this test implements both for the benefit of this test and
  for symmetry.

With those changes, test results are clean now on sparc-sun-solaris2.11,
i386-pc-solaris2.11, i386-apple-darwin11.4.2, and
powerpc-ibm-aix7.2.4.0.

2020-12-03  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	gcc:
	* doc/sourcebuild.texi (Commands for use in dg-final, Scan the
	assembly output, scan-assembler-symbol-section): Document.
	(scan-symbol-section): Document.

	gcc/testsuite:
	* lib/scanasm.exp (scan-symbol-section): Pass args to
	dg-scan-symbol-section.
	(scan-assembler-symbol-section): Likewise.
	(dg-scan-symbol-section): Handle selector from orig_args.
	Get patterns from orig_args.
	(parse_section_of_symbols): Fix section_pattern.
	Strip double quotes from section name.

	* g++.dg/gomp/tls-5.C: Restrict ir, _ZGR2ir_ scans to tls_native.
	* gcc.dg/20021029-1.c: Anchor ar symbol.
	* gcc.dg/darwin-sections.c: Remove obsolete scans for _a, _b in
	.data.