There were fixes in sdl12-compat-0.0.1~git.20210609.efe9791-1.fc35 (bug #1968508) and
another bug about an unnecessary RPATH was fixed in perl-Alien-SDL-1.446-21.fc35
(https://fedoraproject.org/wiki/Changes/Broken_RPATH_will_fail_rpmbuild) in the meain time.

But perl-SDL tests still fails. There are more warnings when configuring perl-SDL:

[Alien::SDL] Testing header(s): SDL.hDetecting available libraries ...
###WARNING### Disabling subsystem 'Video'
 NOK: (fatal error: SDL.h: No such file or directory
    5 | #include <SDL.h>   
      |          ^~~~~~~   
compilation terminated.)

Not really. I had an old sdl12-compat on my system. With sdl12-compat-0.0.1~git.20210609.efe9791-1.fc35 the build and tests pass.

But most of the tests report:

INFO: sdl12-compat, built on Jun  9 2021 at 00:00:00, talking to SDL2 2.0.14
Init SDL_INIT_VIDEO failed with SDL error:
and stderr INFO: FIXME: there is never a parachute in SDL2, should we catch segfaults ourselves? (SDL_Init:1622)
INFO: FIXME: support SDL_INIT_EVENTTHREAD where it makes sense? (SDL_InitSubSystem:1594)

t/core.t ........................ skipped: Failed to init video

That not used to be like that. The tests had passed normally before sdl12-compat replaced SDL.

It can be reduced to:

$ SDL_VIDEODRIVER=dummy perl -Iblib/{lib,arch} -e 'use SDL; $r = SDL::init(0x00000020); $e = SDL::get_error(); print qq{retval = <$r>, error = <$e>\n}'
INFO: sdl12-compat, built on Jun  9 2021 at 00:00:00, talking to SDL2 2.0.14
INFO: FIXME: there is never a parachute in SDL2, should we catch segfaults ourselves? (SDL_Init:1622)
INFO: FIXME: support SDL_INIT_EVENTTHREAD where it makes sense? (SDL_InitSubSystem:1594)
retval = <0>, error = <>

SDL::init() does not fail. But it prints a warning to an error output and that is caught by the tests in t/lib/SDL/TestTool.pm:init():

    ($stdout, $stderr ) = capture { SDL::init($init) };
    if ( $stderr ne '' ) {
        warn 'Init ' . $inits{$init} . ' failed with SDL error: ' . SDL::get_error() . "\nand stderr $stderr\n";
    }

    return !( $stderr ne '' );

In other words the tests check that there is not error output, but sdl12-compat logs there unimplemented features.

I changes the initialization to check a return value instead of stderr like this:

--- a/t/lib/SDL/TestTool.pm
+++ b/t/lib/SDL/TestTool.pm
@@ -20,6 +20,7 @@ sub init {
        my ( $self, $init ) = @_;
        my $stdout = '';
        my $stderr = '';
+       my $retval;
 
        if ( $init == SDL_INIT_VIDEO ) {
                if ( $^O !~ /win/i && !$ENV{DISPLAY} && !$ENV{SDL_VIDEODRIVER} ) {
@@ -36,12 +37,15 @@ sub init {
                SDL::quit();
        }
 
-       ($stdout, $stderr ) = capture { SDL::init($init) };
-       if ( $stderr ne '' ) {
-               warn 'Init ' . $inits{$init} . ' failed with SDL error: ' . SDL::get_error() . "\nand stderr $stderr\n";
+       ($stdout, $stderr ) = capture { $retval = SDL::init($init) };
+       if ( $retval ) {
+               warn 'Init ' . $inits{$init} . ' failed with SDL error: ' . SDL::get_error() . "\n" .
+           ($stderr eq '') ? '' :  "and stderr $stderr\n";
+       } elsif ( $stderr ne '' ) {
+               warn 'Init ' . $inits{$init} . " succeeded but warned:\n$stderr\n";
        }
 
-       return !( $stderr ne '' );
+       return !( $retval );
 }
 
 sub test_audio_open {


All tests pass with old SDL. Some tests fail with sdl12-compat-0.0.1~git.20210609.efe9791-1.fc35:

Test Summary Report
-------------------
t/core.t                      (Wstat: 0 Tests: 28 Failed: 0)
  TODO passed:   21-22, 27
t/core_audio.t                (Wstat: 512 Tests: 45 Failed: 2)
  Failed tests:  30-31
  Non-zero exit status: 2
t/core_events.t               (Wstat: 256 Tests: 679 Failed: 1)
  Failed test:  668
  Non-zero exit status: 1
t/core_multi.t                (Wstat: 0 Tests: 4 Failed: 0)
  TODO passed:   3
t/core_timer.t                (Wstat: 0 Tests: 6 Failed: 0)
  TODO passed:   6
t/core_video.t                (Wstat: 256 Tests: 110 Failed: 1)
  Failed test:  62
  TODO passed:   57, 59
  Non-zero exit status: 1
t/gfx_imagefilter.t           (Wstat: 0 Tests: 8 Failed: 0)
  TODO passed:   7
t/mixer.t                     (Wstat: 768 Tests: 26 Failed: 3)
  Failed tests:  20-21, 23
  Non-zero exit status: 3
t/mixer_mixchunk.t            (Wstat: 256 Tests: 2 Failed: 2)
  Failed tests:  1-2
  Non-zero exit status: 1
  Parse errors: Bad plan.  You planned 6 tests but ran 2.
t/mixer_mixmusic.t            (Wstat: 512 Tests: 6 Failed: 2)
  Failed tests:  4-5
  Non-zero exit status: 2
t/mixer_music.t               (Wstat: 3584 Tests: 35 Failed: 14)
  Failed tests:  1, 8-11, 13-16, 20, 23-24, 28-29
  Non-zero exit status: 14
t/sdlx_music.t                (Wstat: 256 Tests: 2 Failed: 0)
  Non-zero exit status: 1
  Parse errors: No plan found in TAP output
t/sdlx_sound.t                (Wstat: 256 Tests: 5 Failed: 0)
  Non-zero exit status: 1
  Parse errors: No plan found in TAP output
t/sdlx_surface.t              (Wstat: 256 Tests: 1 Failed: 0)
  Non-zero exit status: 1
  Parse errors: No plan found in TAP output
Files=58, Tests=3449, 89 wallclock secs ( 0.34 usr  0.11 sys + 22.68 cusr  2.39 csys = 25.52 CPU)
Result: FAIL
Failed 10/58 test programs. 25/3449 subtests failed.

The stderr checking has already been fixed in upstream with:

commit 39f3db900436329dcc1bfbc28f74775d1304b538
Author: Pino Toscano <toscano.pino>
Date:   Fri May 1 09:51:13 2015 +0200

    TestTool::init: properly handle SDL::init errors
    
    So far TestTool::init was just capturing stdout and stderr of SDL::init,
    using stderr to check whether SDL::init failed. This, other than being
    fragile, misses the init errors.
    
    Switch from checking stderr to checking the actual result code of
    SDL::init.

Could you please take a look at this, Ryan?

This should all be resolved upstream now, including emulating a bug that the Perl unit tests expects.  :)

We no longer spam stderr by default, so it shouldn’t need those workarounds anymore, either.

Unless there are other concerns, I believe this bug can be marked as resolved now.

Petr, I built sdl12-compat-0.0.1~git.20210618.f44f295-1.fc35 in Rawhide, which includes the work Ryan has done. Can you verify that this is fixed now?

Koschei reports that this is no longer a problem: https://koschei.fedoraproject.org/build/10490013

Thanks.