testsuite: Prepare for -std=gnu23 default

Now that C23 support is essentially feature-complete, I'd like to
switch the default language version for C compilation to -std=gnu23.

This requires updating a large number of testcases that fail with the
new language version if left unchanged.  In this patch, update most of
the tests for which there is a safe change that works both before and
after the update to default language version - typically adding the
option -std=gnu17 or -Wno-old-style-definition to the tests.  (There
are also a few tests where I'd like to investigate further why they
fail with -std=gnu23, or where I think such failures show an actual
bug to fix before changing the default language version, or where it
seems more appropriate to make a testcase change that would result in
failures in the absence of the language version change rather than
just adding an option that does nothing with the gnu17 default.)

The libffi test fixes have also been submitted upstream:
<https://github.com/libffi/libffi/pull/861>.

Most of the failures requiring such changes are for one of two
reasons:

* Unprototyped function declarations with () (meaning the same as
  (void) in C23 mode) for a function then called with arguments.

* Old-style function definitions, which warn by default in C23 mode,
  so resulting in test failures for the unexpected warnings.

Other reasons for failures include:

* Tests with their own definitions of bool, true and false.

* Tests of diagnostics (often with -pedantic) in cases where C23 has
  changed semantics, such as:

  - tag compatibility for structs;
  - enum values out of range of int;
  - handing of qualified array types;
  - decimal floating types formerly needing -pedantic diagnostics, but
    being standard in C23.

Bootstrapped with no regressions for x86_64-pc-linux-gnu.

gcc/testsuite/
	* c-c++-common/Wcast-function-type.c: Add -std=gnu17 for C.
	* c-c++-common/Wformat-pr84258.c: Add -std=gnu17 for C.
	* c-c++-common/Wvarargs.c: Add -std=gnu17 for C.
	* c-c++-common/analyzer/data-model-12.c: Add -std=gnu17 for C.
	* c-c++-common/builtins.c: Add -std=gnu17 for C.
	* c-c++-common/pointer-to-fn1.c: Add -std=gnu17 for C.
	* c-c++-common/pragma-diag-17.c: Add -std=gnu17 for C.
	* c-c++-common/sizeof-array-argument.c: Add
	-Wno-old-style-definition for C.
	* g++.dg/lto/pr54625-1_0.c: Add -std=gnu17.
	* g++.dg/lto/pr54625-2_0.c: Add -std=gnu17.
	* gcc.c-torture/compile/20040214-2.c: Add -std=gnu17.
	* gcc.c-torture/compile/921011-2.c: Add -std=gnu17.
	* gcc.c-torture/compile/931102-1.c: Add -std=gnu17.
	* gcc.c-torture/compile/990801-1.c: Add -std=gnu17.
	* gcc.c-torture/compile/nested-1.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr100241-1.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr106101.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr113616.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr47967.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr51694.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr71109.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr83051-2.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr89663-1.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr94238.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr96796.c: Add -std=gnu17.
	* gcc.c-torture/compile/pr97576.c: Add -std=gnu17.
	* gcc.c-torture/compile/udivmod4.c: Add -std=gnu17.
	* gcc.c-torture/execute/20010605-2.c: Add -std=gnu17.
	* gcc.c-torture/execute/20020404-1.c: Add -std=gnu17.
	* gcc.c-torture/execute/20030714-1.c: Add -std=gnu17.
	* gcc.c-torture/execute/20051012-1.c: Add -std=gnu17.
	* gcc.c-torture/execute/20190820-1.c: Add -std=gnu17.
	* gcc.c-torture/execute/920612-1.c: Add -Wno-old-style-definition.
	* gcc.c-torture/execute/930608-1.c: Add -std=gnu17.
	* gcc.c-torture/execute/comp-goto-1.c: Add -std=gnu17.
	* gcc.c-torture/execute/ieee/fp-cmp-1.x: Add -std=gnu17.
	* gcc.c-torture/execute/ieee/fp-cmp-2.x: Add -std=gnu17.
	* gcc.c-torture/execute/ieee/fp-cmp-3.x: Add -std=gnu17.
	* gcc.c-torture/execute/ieee/fp-cmp-4.x: New file.
	* gcc.c-torture/execute/ieee/fp-cmp-4f.x: New file.
	* gcc.c-torture/execute/ieee/fp-cmp-4l.x: New file.
	* gcc.c-torture/execute/loop-9.c: Add -std=gnu17.
	* gcc.c-torture/execute/pr103209.c: Add -std=gnu17.
	* gcc.c-torture/execute/pr28289.c: Add -std=gnu17.
	* gcc.c-torture/execute/pr34982.c: Add -std=gnu17.
	* gcc.c-torture/execute/pr67037.c: Add -std=gnu17.
	* gcc.c-torture/execute/va-arg-2.c: Add -std=gnu17.
	* gcc.dg/20010202-1.c: Add -std=gnu17.
	* gcc.dg/20020430-1.c: Add -std=gnu17.
	* gcc.dg/20031218-3.c: Add -std=gnu17.
	* gcc.dg/20040127-1.c: Add -std=gnu17.
	* gcc.dg/20041014-1.c: Add -Wno-old-style-definition.
	* gcc.dg/20041122-1.c: Add -std=gnu17.
	* gcc.dg/20050309-1.c: Add -std=gnu17.
	* gcc.dg/20061026.c: Add -std=gnu17.
	* gcc.dg/20101010-1.c: Add -std=gnu17.
	* gcc.dg/Warray-parameter-10.c: Add -std=gnu17.
	* gcc.dg/Wbuiltin-declaration-mismatch-2.c: Add -std=gnu17.
	* gcc.dg/Wbuiltin-declaration-mismatch-3.c: Add -std=gnu17.
	* gcc.dg/Wbuiltin-declaration-mismatch-4.c: Add -std=gnu17.
	* gcc.dg/Wbuiltin-declaration-mismatch-5.c: Add -std=gnu17.
	* gcc.dg/Wbuiltin-declaration-mismatch.c: Add -std=gnu17.
	* gcc.dg/Wcxx-compat-2.c: Add -std=gnu17.
	* gcc.dg/Wdouble-promotion.c: Add -std=gnu17.
	* gcc.dg/Wfree-nonheap-object-7.c: Add -std=gnu17.
	* gcc.dg/Wimplicit-int-1.c: Add -std=gnu17.
	* gcc.dg/Wimplicit-int-1a.c: Add -std=gnu17.
	* gcc.dg/Wimplicit-int-2.c: Add -std=gnu17.
	* gcc.dg/Wimplicit-int-3.c: Add -std=gnu17.
	* gcc.dg/Wimplicit-int-4.c: Add -std=gnu17.
	* gcc.dg/Wimplicit-int-4a.c: Add -std=gnu17.
	* gcc.dg/Wincompatible-pointer-types-1.c: Add -std=gnu17.
	* gcc.dg/Wrestrict-19.c: Add -std=gnu17.
	* gcc.dg/Wrestrict-4.c: Add -std=gnu17.
	* gcc.dg/Wrestrict-5.c: Add -std=gnu17.
	* gcc.dg/Wstrict-overflow-20.c: Add -std=gnu17.
	* gcc.dg/Wstringop-overflow-13.c: Add -std=gnu17.
	* gcc.dg/analyzer/doom-d_main-IdentifyVersion.c: Add -std=gnu17.
	* gcc.dg/analyzer/doom-s_sound-pr108867.c: Add -std=gnu17.
	* gcc.dg/analyzer/pr93032-mztools-signed-char.c: Add
	-Wno-old-style-definition.
	* gcc.dg/analyzer/pr93032-mztools-unsigned-char.c: Add
	-Wno-old-style-definition.
	* gcc.dg/analyzer/pr93355-localealias.c: Add
	-Wno-old-style-definition.
	* gcc.dg/analyzer/pr93375.c: Add -std=gnu17.
	* gcc.dg/analyzer/pr94688.c: Add -std=gnu17.
	* gcc.dg/analyzer/sensitive-1.c: Add -std=gnu17.
	* gcc.dg/analyzer/torture/asm-x86-linux-wfx_get_ps_timeout-full.c:
	Add -std=gnu17.
	* gcc.dg/analyzer/torture/pr104863.c: Add -std=gnu17.
	* gcc.dg/analyzer/torture/pr93379.c: Add -std=gnu17.
	* gcc.dg/array-quals-2.c: Add -std=gnu17.
	* gcc.dg/attr-invalid.c: Add -Wno-old-style-definition.
	* gcc.dg/auto-init-uninit-A.c: Add -Wno-old-style-definition.
	* gcc.dg/builtin-choose-expr.c: Declare exit with (int) prototype.
	* gcc.dg/builtin-tgmath-err-1.c: Add -std=gnu17.
	* gcc.dg/builtins-30.c: Add -std=gnu17.
	* gcc.dg/cast-function-1.c: Add -std=gnu17.
	* gcc.dg/cleanup-1.c: Add -std=gnu17.
	* gcc.dg/compat/struct-complex-1_x.c: Add -std=gnu17.
	* gcc.dg/compat/struct-complex-2_x.c: Add -std=gnu17.
	* gcc.dg/compat/union-m128-1_x.c: Add -std=gnu17.
	* gcc.dg/debug/dwarf2/pr66482.c: Add -std=gnu17.
	* gcc.dg/dfp/composite-type-2.c: Add -std=gnu17.
	* gcc.dg/dfp/composite-type.c: Add -std=gnu17.
	* gcc.dg/dfp/keywords-pedantic.c: Add -std=gnu17.
	* gcc.dg/dremf-type-compat-1.c: Add -std=gnu17.
	* gcc.dg/dremf-type-compat-2.c: Add -std=gnu17.
	* gcc.dg/dremf-type-compat-3.c: Add -std=gnu17.
	* gcc.dg/dremf-type-compat-4.c: Add -std=gnu17.
	* gcc.dg/enum-compat-1.c: Add -std=gnu17.
	* gcc.dg/enum-compat-2.c: Add -std=gnu17.
	* gcc.dg/floatn-errs.c: Add -std=gnu17.
	* gcc.dg/fltconst-pedantic-dfp.c: Add -std=gnu17.
	* gcc.dg/format/proto.c: Add -std=gnu17.
	* gcc.dg/format/sentinel-1.c: Add -std=gnu17.
	* gcc.dg/gomp/declare-simd-1.c: Add -Wno-old-style-definition.
	* gcc.dg/ifelse-1.c: Add -Wno-old-style-definition.
	* gcc.dg/inline-33.c: Add -std=gnu17.
	* gcc.dg/ipa/inline-5.c: Add -std=gnu17.
	* gcc.dg/ipa/ipa-sra-21.c: Add -std=gnu17.
	* gcc.dg/ipa/pr102714.c: Add -std=gnu17.
	* gcc.dg/ipa/pr104813.c: Add -std=gnu17.
	* gcc.dg/ipa/pr108679.c: Add -std=gnu17.
	* gcc.dg/ipa/pr42706.c: Add -std=gnu17.
	* gcc.dg/ipa/pr88214.c: Add -Wno-old-style-definition.
	* gcc.dg/ipa/pr91853.c: Add -Wno-old-style-definition.
	* gcc.dg/ipa/pr93763.c: Add -std=gnu17.
	* gcc.dg/ipa/pr96482-2.c: Add -std=gnu17.
	* gcc.dg/lto/20091013-1_2.c: Add -std=gnu17.
	* gcc.dg/lto/20091015-1_2.c: Add -std=gnu17.
	* gcc.dg/lto/pr113197_1.c: Add -std=gnu17.
	* gcc.dg/lto/pr54702_1.c: Add -std=gnu17.
	* gcc.dg/lto/pr99849_0.c: Add -std=gnu17.
	* gcc.dg/noncompile/920923-1.c: Add -std=gnu17.
	* gcc.dg/noncompile/old-style-parm-1.c: Add
	-Wno-old-style-definition.
	* gcc.dg/noncompile/old-style-parm-3.c: Add
	-Wno-old-style-definition.
	* gcc.dg/noncompile/pr30552-2.c: Add -Wno-old-style-definition.
	* gcc.dg/noncompile/pr30552-3.c: Add -std=gnu17.
	* gcc.dg/noncompile/pr71265.c: Add -Wno-old-style-definition.
	* gcc.dg/noncompile/pr79758-2.c: Add -Wno-old-style-definition.
	* gcc.dg/noncompile/pr79758.c: Add -Wno-old-style-definition.
	* gcc.dg/noncompile/va-arg-1.c: Add -std=gnu17.
	* gcc.dg/old-style-prom-1.c: Add -std=gnu17.
	* gcc.dg/old-style-prom-2.c: Add -std=gnu17.
	* gcc.dg/old-style-prom-3.c: Add -std=gnu17.
	* gcc.dg/old-style-then-proto-1.c: Add -std=gnu17.
	* gcc.dg/parm-incomplete-1.c: Add -std=gnu17.
	* gcc.dg/parm-mismatch-1.c: Add -std=gnu17.
	* gcc.dg/permerror-default.c: Add -std=gnu17.
	* gcc.dg/permerror-fpermissive-nowarning.c: Add -std=gnu17.
	* gcc.dg/permerror-fpermissive.c: Add -std=gnu17.
	* gcc.dg/permerror-noerror.c: Add -std=gnu17.
	* gcc.dg/permerror-nowarning.c: Add -std=gnu17.
	* gcc.dg/permerror-pedantic.c: Add -std=gnu17.
	* gcc.dg/plugin/infoleak-net-ethtool-ioctl.c: Add -std=gnu17.
	* gcc.dg/pointer-array-quals-1.c: Add -std=gnu17.
	* gcc.dg/pointer-array-quals-2.c: Add -std=gnu17.
	* gcc.dg/pr100791.c: Add -std=gnu17.
	* gcc.dg/pr100843.c: Add -std=gnu17.
	* gcc.dg/pr102273.c: Add -std=gnu17.
	* gcc.dg/pr102385.c: Add -std=gnu17.
	* gcc.dg/pr103222.c: Add -std=gnu17.
	* gcc.dg/pr105140.c: Add -std=gnu17.
	* gcc.dg/pr105150.c: Add -std=gnu17.
	* gcc.dg/pr105250.c: Add -std=gnu17.
	* gcc.dg/pr105972.c: Add -Wno-old-style-definition.
	* gcc.dg/pr111039.c: Add -std=gnu17.
	* gcc.dg/pr111407.c: Add -std=gnu17.
	* gcc.dg/pr111922.c: Add -Wno-old-style-definition.
	* gcc.dg/pr15236.c: Add -std=gnu17.
	* gcc.dg/pr17188-1.c: Add -std=gnu17.
	* gcc.dg/pr20368-1.c: Add -std=gnu17.
	* gcc.dg/pr20368-2.c: Add -std=gnu17.
	* gcc.dg/pr20368-3.c: Add -std=gnu17.
	* gcc.dg/pr27331.c: Add -Wno-old-style-definition.
	* gcc.dg/pr27861-1.c: Add -std=gnu17.
	* gcc.dg/pr28121.c: Add -std=gnu17.
	* gcc.dg/pr28243.c: Add -std=gnu17.
	* gcc.dg/pr28888.c: Add -std=gnu17.
	* gcc.dg/pr29254.c: Add -std=gnu17.
	* gcc.dg/pr34457-1.c: Add -std=gnu17.
	* gcc.dg/pr36015.c: Add -std=gnu17.
	* gcc.dg/pr38245-3.c: Add -std=gnu17.
	* gcc.dg/pr38245-4.c: Add -std=gnu17.
	* gcc.dg/pr41241.c: Add -std=gnu17.
	* gcc.dg/pr43058.c: Add -std=gnu17.
	* gcc.dg/pr44539.c: Add -std=gnu17.
	* gcc.dg/pr45055.c: Add -std=gnu17.
	* gcc.dg/pr50908.c: Add -Wno-old-style-definition.
	* gcc.dg/pr60647-1.c: Add -Wno-old-style-definition.
	* gcc.dg/pr63762.c: Add -std=gnu17.
	* gcc.dg/pr63804.c: Add -std=gnu17.
	* gcc.dg/pr68306-3.c: Add -std=gnu17.
	* gcc.dg/pr68533.c: Add -std=gnu17.
	* gcc.dg/pr69156.c: Add -std=gnu17.
	* gcc.dg/pr7356-2.c: Add -Wno-old-style-definition.
	* gcc.dg/pr79983.c: Add -std=gnu17.
	* gcc.dg/pr83463.c: Add -std=gnu17.
	* gcc.dg/pr87347.c: Add -std=gnu17.
	* gcc.dg/pr89521-1.c: Add -std=gnu17.
	* gcc.dg/pr89521-2.c: Add -std=gnu17.
	* gcc.dg/pr90648.c: Add -std=gnu17.
	* gcc.dg/pr93573-1.c: Add -std=gnu17.
	* gcc.dg/pr94167.c: Add -std=gnu17.
	* gcc.dg/pr94705.c: Add -std=gnu17.
	* gcc.dg/pr95118.c: Add -std=gnu17.
	* gcc.dg/pr96335.c: Add -std=gnu17.
	* gcc.dg/pr97830.c: Add -std=gnu17.
	* gcc.dg/pr97882.c: Add -std=gnu17.
	* gcc.dg/pr99122-2.c: Add -std=gnu17.
	* gcc.dg/pr99122-3.c: Add -std=gnu17.
	* gcc.dg/qual-component-1.c: Add -std=gnu17.
	* gcc.dg/sibcall-6.c: Add -Wno-old-style-definition.
	* gcc.dg/sms-2.c: Add -Wno-old-style-definition.
	* gcc.dg/tm/20091221.c: Add -std=gnu17.
	* gcc.dg/torture/bfloat16-basic.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/float128-basic.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/float128x-basic.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/float16-basic.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/float32-basic.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/float32x-basic.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/float64-basic.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/float64x-basic.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/pr102762.c: Add -std=gnu17.
	* gcc.dg/torture/pr103987.c: Add -std=gnu17.
	* gcc.dg/torture/pr104825.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/pr105166.c: Add -std=gnu17.
	* gcc.dg/torture/pr105185.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/pr109652.c: Add -std=gnu17.
	* gcc.dg/torture/pr112444.c: Add -std=gnu17.
	* gcc.dg/torture/pr113895-3.c: Add -std=gnu17.
	* gcc.dg/torture/pr24626-2.c: Add -std=gnu17.
	* gcc.dg/torture/pr25183.c: Add -std=gnu17.
	* gcc.dg/torture/pr38948.c: Add -std=gnu17.
	* gcc.dg/torture/pr44807.c: Add -std=gnu17.
	* gcc.dg/torture/pr47281.c: Add -std=gnu17.
	* gcc.dg/torture/pr47958-1.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/pr48063.c: Add -std=gnu17.
	* gcc.dg/torture/pr57036-1.c: Add -std=gnu17.
	* gcc.dg/torture/pr57330.c: Add -std=gnu17.
	* gcc.dg/torture/pr57584.c: Add -std=gnu17.
	* gcc.dg/torture/pr67741.c: Add -std=gnu17.
	* gcc.dg/torture/pr68104.c: Add -std=gnu17.
	* gcc.dg/torture/pr69242.c: Add -std=gnu17.
	* gcc.dg/torture/pr70457.c: Add -std=gnu17.
	* gcc.dg/torture/pr70985.c: Add -std=gnu17.
	* gcc.dg/torture/pr71606.c: Add -std=gnu17.
	* gcc.dg/torture/pr71816.c: Add -std=gnu17.
	* gcc.dg/torture/pr77286.c: Add -std=gnu17.
	* gcc.dg/torture/pr77646.c: Add -std=gnu17.
	* gcc.dg/torture/pr77677-2.c: Add -std=gnu17.
	* gcc.dg/torture/pr78365.c: Add -Wno-old-style-definition.
	* gcc.dg/torture/pr79732.c: Add -std=gnu17.
	* gcc.dg/torture/pr80612.c: Add -std=gnu17.
	* gcc.dg/torture/pr80764.c: Add -std=gnu17.
	* gcc.dg/torture/pr80842.c: Add -std=gnu17.
	* gcc.dg/torture/pr81900.c: Add -std=gnu17.
	* gcc.dg/torture/pr82276.c: Add -std=gnu17.
	* gcc.dg/torture/pr84803.c: Add -std=gnu17.
	* gcc.dg/torture/pr93124.c: Add -std=gnu17.
	* gcc.dg/torture/pr97330-1.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-prof/comp-goto-1.c: Add -std=gnu17.
	* gcc.dg/tree-ssa/20030703-2.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030708-1.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030709-2.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030709-3.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030710-1.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030711-1.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030711-2.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030711-3.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030714-1.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030714-2.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030728-1.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030807-10.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030807-11.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030807-3.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030807-6.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030807-7.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030814-4.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030814-5.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030814-6.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20030918-1.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/20040514-2.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/loadpre7.c: Add -Wno-old-style-definition.
	* gcc.dg/tree-ssa/pr111003.c: Add -std=gnu17.
	* gcc.dg/tree-ssa/pr115128.c: Add -std=gnu17.
	* gcc.dg/tree-ssa/pr115191.c: Add -std=gnu17.
	* gcc.dg/tree-ssa/pr24840.c: Add -std=gnu17.
	* gcc.dg/tree-ssa/pr69666.c: Add -std=gnu17.
	* gcc.dg/tree-ssa/pr70232.c: Add -std=gnu17.
	* gcc.dg/ubsan/pr79757-1.c: Add -Wno-old-style-definition.
	* gcc.dg/ubsan/pr79757-2.c: Add -Wno-old-style-definition.
	* gcc.dg/ubsan/pr79757-3.c: Add -Wno-old-style-definition.
	* gcc.dg/ubsan/pr81223.c: Add -std=gnu17.
	* gcc.dg/uninit-10-O0.c: Add -Wno-old-style-definition.
	* gcc.dg/uninit-10.c: Add -Wno-old-style-definition.
	* gcc.dg/uninit-32.c: Add -std=gnu17.
	* gcc.dg/uninit-41.c: Add -std=gnu17.
	* gcc.dg/uninit-A-O0.c: Add -Wno-old-style-definition.
	* gcc.dg/uninit-A.c: Add -Wno-old-style-definition.
	* gcc.dg/unused-1.c: Add -Wno-old-style-definition.
	* gcc.dg/vect/bb-slp-pr114249.c: Add -std=gnu17.
	* gcc.dg/vect/bb-slp-pr97486.c: Add -std=gnu17.
	* gcc.dg/vect/bb-slp-subgroups-1.c: Add -std=gnu17.
	* gcc.dg/vect/bb-slp-subgroups-2.c: Add -std=gnu17.
	* gcc.dg/vect/bb-slp-subgroups-3.c: Add -std=gnu17.
	* gcc.dg/vect/vect-early-break_111-pr113731.c: Add -std=gnu17.
	* gcc.dg/vect/vect-early-break_122-pr114239.c: Add -std=gnu17.
	* gcc.dg/vect/vect-multi-peel-gaps.c: Add -std=gnu17.
	* gcc.dg/vla-stexp-2.c: Add -std=gnu17.
	* gcc.dg/warn-1.c: Add -Wno-old-style-definition.
	* gcc.dg/winline-10.c: Add -Wno-old-style-definition.
	* gcc.dg/wtr-label-1.c: Add -Wno-old-style-definition.
	* gcc.dg/wtr-switch-1.c: Add -Wno-old-style-definition.
	* gcc.target/i386/excess-precision-3.c: Add
	-Wno-old-style-definition.
	* gcc.target/i386/fma4-256-nmsubXX.c: Add -std=gnu17.
	* gcc.target/i386/fma4-nmsubXX.c: Add -std=gnu17.
	* gcc.target/i386/nop-mcount.c: Add -Wno-old-style-definition.
	* gcc.target/i386/pr102627.c: Add -std=gnu17.
	* gcc.target/i386/pr106994.c: Add -std=gnu17.
	* gcc.target/i386/pr68349.c: Add -std=gnu17.
	* gcc.target/i386/pr97313.c: Add -std=gnu17.
	* gcc.target/i386/pr99454.c: Add -std=gnu17.
	* gcc.target/i386/record-mcount.c: Add -Wno-old-style-definition.

libffi/
	* testsuite/libffi.call/va_struct2.c (test_fn): Cast n to void.
	* testsuite/libffi.call/va_struct3.c (test_fn): Likewise.
	Backported from <https://github.com/libffi/libffi/pull/861>.

11 files changed, 12 insertions, 8 deletions

diff --git a/gcc/testsuite/gcc.dg/analyzer/doom-d_main-IdentifyVersion.c b/gcc/testsuite/gcc.dg/analyzer/doom-d_main-IdentifyVersion.c
index 982b9b7..1605047 100644
--- a/gcc/testsuite/gcc.dg/analyzer/doom-d_main-IdentifyVersion.c
+++ b/gcc/testsuite/gcc.dg/analyzer/doom-d_main-IdentifyVersion.c
@@ -1,6 +1,6 @@
 /* Reduced from Doom's d_main.c, which is under the GPLv2 or later.  */
 
-/* { dg-additional-options "-Wno-analyzer-too-complex" } */
+/* { dg-additional-options "-std=gnu17 -Wno-analyzer-too-complex" } */
 
 typedef __SIZE_TYPE__ size_t;
 typedef struct _IO_FILE FILE;
diff --git a/gcc/testsuite/gcc.dg/analyzer/doom-s_sound-pr108867.c b/gcc/testsuite/gcc.dg/analyzer/doom-s_sound-pr108867.c
index fdc21a2..ac0a789 100644
--- a/gcc/testsuite/gcc.dg/analyzer/doom-s_sound-pr108867.c
+++ b/gcc/testsuite/gcc.dg/analyzer/doom-s_sound-pr108867.c
@@ -1,6 +1,6 @@
 /* Reduced from Doom's linuxdoom-1.10/s_sound.c, which is GPLv2 or later.  */
 
-/* { dg-additional-options "-fno-analyzer-call-summaries -Wno-analyzer-too-complex -Wno-analyzer-symbol-too-complex" } */
+/* { dg-additional-options "-std=gnu17 -fno-analyzer-call-summaries -Wno-analyzer-too-complex -Wno-analyzer-symbol-too-complex" } */
 /* { dg-require-effective-target size32plus } */
 
 typedef struct _IO_FILE FILE;
diff --git a/gcc/testsuite/gcc.dg/analyzer/pr93032-mztools-signed-char.c b/gcc/testsuite/gcc.dg/analyzer/pr93032-mztools-signed-char.c
index 7a7320f..1941e49 100644
--- a/gcc/testsuite/gcc.dg/analyzer/pr93032-mztools-signed-char.c
+++ b/gcc/testsuite/gcc.dg/analyzer/pr93032-mztools-signed-char.c
@@ -4,7 +4,7 @@
    removed.  */
 
 /* { dg-do "compile" } */
-/* { dg-additional-options "-fsigned-char" } */
+/* { dg-additional-options "-Wno-old-style-definition -fsigned-char" } */
 /* { dg-require-effective-target int32plus } */
 
 /* TODO (PR analyzer/112528): remove need for this.  */
diff --git a/gcc/testsuite/gcc.dg/analyzer/pr93032-mztools-unsigned-char.c b/gcc/testsuite/gcc.dg/analyzer/pr93032-mztools-unsigned-char.c
index 1083275..ca7ab13 100644
--- a/gcc/testsuite/gcc.dg/analyzer/pr93032-mztools-unsigned-char.c
+++ b/gcc/testsuite/gcc.dg/analyzer/pr93032-mztools-unsigned-char.c
@@ -4,7 +4,7 @@
    removed.  */
 
 /* { dg-do "compile" } */
-/* { dg-additional-options "-funsigned-char" } */
+/* { dg-additional-options "-Wno-old-style-definition -funsigned-char" } */
 /* { dg-require-effective-target int32plus } */
 
 /* TODO (PR analyzer/112528): remove need for this.  */
diff --git a/gcc/testsuite/gcc.dg/analyzer/pr93355-localealias.c b/gcc/testsuite/gcc.dg/analyzer/pr93355-localealias.c
index 88d0fc1..4ccba46 100644
--- a/gcc/testsuite/gcc.dg/analyzer/pr93355-localealias.c
+++ b/gcc/testsuite/gcc.dg/analyzer/pr93355-localealias.c
@@ -3,7 +3,7 @@
    Adapted from intl/localealias.c, with all #includes removed.  */
 
 /* { dg-do "compile" } */
-/* { dg-additional-options "-Wno-analyzer-too-complex" } */
+/* { dg-additional-options "-Wno-old-style-definition -Wno-analyzer-too-complex" } */
 /* TODO: remove the need for this option.  */
 /* { dg-require-effective-target alloca } */
 
diff --git a/gcc/testsuite/gcc.dg/analyzer/pr93375.c b/gcc/testsuite/gcc.dg/analyzer/pr93375.c
index f610854..34ca68b 100644
--- a/gcc/testsuite/gcc.dg/analyzer/pr93375.c
+++ b/gcc/testsuite/gcc.dg/analyzer/pr93375.c
@@ -1,4 +1,4 @@
-/* { dg-additional-options "-Wno-implicit-int" } */
+/* { dg-additional-options "-std=gnu17 -Wno-implicit-int" } */
 
 extern void foo (void *) __attribute__((nonnull));
 
diff --git a/gcc/testsuite/gcc.dg/analyzer/pr94688.c b/gcc/testsuite/gcc.dg/analyzer/pr94688.c
index 8ea8bc3..06152d1 100644
--- a/gcc/testsuite/gcc.dg/analyzer/pr94688.c
+++ b/gcc/testsuite/gcc.dg/analyzer/pr94688.c
@@ -1,3 +1,4 @@
+/* { dg-additional-options "-std=gnu17" } */
 /* { dg-skip-if "PR112705" { hppa*64*-*-* } } */
 int a, b;
 void d();
diff --git a/gcc/testsuite/gcc.dg/analyzer/sensitive-1.c b/gcc/testsuite/gcc.dg/analyzer/sensitive-1.c
index c66af92..ee82bb6 100644
--- a/gcc/testsuite/gcc.dg/analyzer/sensitive-1.c
+++ b/gcc/testsuite/gcc.dg/analyzer/sensitive-1.c
@@ -1,3 +1,5 @@
+/* { dg-additional-options "-std=gnu17" } */
+
 #include <stdio.h>
 
 /* Solaris needs this for <unistd.h> to declare getpass.  */
diff --git a/gcc/testsuite/gcc.dg/analyzer/torture/asm-x86-linux-wfx_get_ps_timeout-full.c b/gcc/testsuite/gcc.dg/analyzer/torture/asm-x86-linux-wfx_get_ps_timeout-full.c
index 4cbf432..f5329d8 100644
--- a/gcc/testsuite/gcc.dg/analyzer/torture/asm-x86-linux-wfx_get_ps_timeout-full.c
+++ b/gcc/testsuite/gcc.dg/analyzer/torture/asm-x86-linux-wfx_get_ps_timeout-full.c
@@ -1,6 +1,6 @@
 /* { dg-do compile { target x86_64-*-* } } */
 /* { dg-require-effective-target lp64 } */
-/* { dg-additional-options "-fsanitize=bounds -fno-analyzer-call-summaries" } */
+/* { dg-additional-options "-std=gnu17 -fsanitize=bounds -fno-analyzer-call-summaries" } */
 /* { dg-skip-if "" { *-*-* } { "-O0" } { "" } } */
 
 /* Reduced from linux kernel: drivers/staging/wfx/sta.c (GPL-2.0)
diff --git a/gcc/testsuite/gcc.dg/analyzer/torture/pr104863.c b/gcc/testsuite/gcc.dg/analyzer/torture/pr104863.c
index 30ed4fe..6487e96 100644
--- a/gcc/testsuite/gcc.dg/analyzer/torture/pr104863.c
+++ b/gcc/testsuite/gcc.dg/analyzer/torture/pr104863.c
@@ -1,4 +1,4 @@
-/* { dg-additional-options "-fanalyzer-transitivity" } */
+/* { dg-additional-options "-std=gnu17 -fanalyzer-transitivity" } */
 /* { dg-skip-if "" { *-*-* } { "-fno-fat-lto-objects" } { "" } } */
 
 extern void g();
diff --git a/gcc/testsuite/gcc.dg/analyzer/torture/pr93379.c b/gcc/testsuite/gcc.dg/analyzer/torture/pr93379.c
index 01465cf..6d6ac14 100644
--- a/gcc/testsuite/gcc.dg/analyzer/torture/pr93379.c
+++ b/gcc/testsuite/gcc.dg/analyzer/torture/pr93379.c
@@ -1,2 +1,3 @@
 /* { dg-do compile } */
+/* { dg-additional-options "-std=gnu17" } */
 #include "../../torture/pr57330.c"