+#endif /* defined(CMSG_SPACE) && defined(CMSG_LEN) */
+ALL_LIBC
+
+ my $inline_dir = $ENV{PERL_INLINE_DIRECTORY} // (
+ $ENV{XDG_CACHE_HOME} //
+ ( ($ENV{HOME} // '/nonexistent').'/.cache' )
+ ).'/public-inbox/inline-c';
+ warn "$inline_dir exists, not writable\n" if -e $inline_dir && !-w _;
+ $all_libc = undef unless -d _ && -w _;
+ if (defined $all_libc) {
+ local $ENV{PERL_INLINE_DIRECTORY} = $inline_dir;
+ my $f = "$inline_dir/.public-inbox.lock";
+ open my $oldout, '>&', \*STDOUT or die "dup(1): $!";
+ open my $olderr, '>&', \*STDERR or die "dup(2): $!";
+ open my $fh, '+>', $f or die "open($f): $!";
+ open STDOUT, '>&', $fh or die "1>$f: $!";
+ open STDERR, '>&', $fh or die "2>$f: $!";
+ STDERR->autoflush(1);
+ STDOUT->autoflush(1);
+
+ # CentOS 7.x ships Inline 0.53, 0.64+ has built-in locking
+ flock($fh, LOCK_EX) or die "LOCK_EX($f): $!";
+ eval <<'EOM';
+use Inline C => $all_libc, BUILD_NOISY => 1;
+EOM
+ my $err = $@;
+ my $ndc_err = '';
+ $err = $@;
+ open(STDERR, '>&', $olderr) or warn "restore stderr: $!";
+ open(STDOUT, '>&', $oldout) or warn "restore stdout: $!";
+ if ($err) {
+ seek($fh, 0, SEEK_SET);
+ my @msg = <$fh>;
+ warn "Inline::C build failed:\n",
+ $ndc_err, $err, "\n", @msg;
+ $all_libc = undef;
+ }
+ }
+ if (defined $all_libc) { # set for Gcf2
+ $ENV{PERL_INLINE_DIRECTORY} = $inline_dir;
+ } else {
+ require PublicInbox::SpawnPP;
+ *pi_fork_exec = \&PublicInbox::SpawnPP::pi_fork_exec
+ }
+} # /BEGIN