[PATCH] testsuite: Remove reliance on argc in lto/pr101868_0.c

[Dimitar Dimitrov]

Some embedded targets do not pass any argv arguments.  When argc is
zero, this causes spurious failures for lto/pr101868_0.c.  Fix by
following the strategy in r0-114701-g2c49569ecea56d.  Use a volatile
variable instead of argc to inject a runtime value into the test.

I validated the following:
  - No changes in testresults for x86_64-pc-linux-gnu.
  - The spurious failures are fixed for PRU target.
  - lto/pr101868_0.c still fails on x86_64-pc-linux-gnu, if
the PR/101868 fix (r12-2254-gfedcf3c476aff7) is reverted.

Ok for trunk?

PR tree-optimization/101868

gcc/testsuite/ChangeLog:

* gcc.dg/lto/pr101868_0.c (zero): New volatile variable.
(main): Use it instead of argc.

Signed-off-by: Dimitar Dimitrov 
---
 gcc/testsuite/gcc.dg/lto/pr101868_0.c | 7 ---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/gcc/testsuite/gcc.dg/lto/pr101868_0.c 
b/gcc/testsuite/gcc.dg/lto/pr101868_0.c
index c84d19b0267..03124308267 100644
--- a/gcc/testsuite/gcc.dg/lto/pr101868_0.c
+++ b/gcc/testsuite/gcc.dg/lto/pr101868_0.c
@@ -22,12 +22,13 @@ repro(VALUE dummy, VALUE hash)
 
 static VALUE (*that)(VALUE dummy, VALUE hash) = repro;
 
+volatile int zero = 0;
+
 int
 main(int argc, char **argv)
 {
-argc--;
-that(0, argc);
+that(0, zero);
 
-rb_check_type(argc, argc);
+rb_check_type(zero, zero);
 
 }
-- 
2.36.1

Re: [PATCH] testsuite: Remove reliance on argc in lto/pr101868_0.c

[Richard Biener via Gcc-patches]

On Thu, Jun 23, 2022 at 11:23 PM Dimitar Dimitrov  wrote:
>
> Some embedded targets do not pass any argv arguments.  When argc is
> zero, this causes spurious failures for lto/pr101868_0.c.  Fix by
> following the strategy in r0-114701-g2c49569ecea56d.  Use a volatile
> variable instead of argc to inject a runtime value into the test.
>
> I validated the following:
>   - No changes in testresults for x86_64-pc-linux-gnu.
>   - The spurious failures are fixed for PRU target.
>   - lto/pr101868_0.c still fails on x86_64-pc-linux-gnu, if
> the PR/101868 fix (r12-2254-gfedcf3c476aff7) is reverted.
>
> Ok for trunk?

OK

> PR tree-optimization/101868
>
> gcc/testsuite/ChangeLog:
>
> * gcc.dg/lto/pr101868_0.c (zero): New volatile variable.
> (main): Use it instead of argc.
>
> Signed-off-by: Dimitar Dimitrov 
> ---
>  gcc/testsuite/gcc.dg/lto/pr101868_0.c | 7 ---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/gcc/testsuite/gcc.dg/lto/pr101868_0.c 
> b/gcc/testsuite/gcc.dg/lto/pr101868_0.c
> index c84d19b0267..03124308267 100644
> --- a/gcc/testsuite/gcc.dg/lto/pr101868_0.c
> +++ b/gcc/testsuite/gcc.dg/lto/pr101868_0.c
> @@ -22,12 +22,13 @@ repro(VALUE dummy, VALUE hash)
>
>  static VALUE (*that)(VALUE dummy, VALUE hash) = repro;
>
> +volatile int zero = 0;
> +
>  int
>  main(int argc, char **argv)
>  {
> -argc--;
> -that(0, argc);
> +that(0, zero);
>
> -rb_check_type(argc, argc);
> +rb_check_type(zero, zero);
>
>  }
> --
> 2.36.1
>