Fix i686 build failure due to nolibc

liburing builds without libc (-ffreestanding) by default. Unfortunately,
Fedora's compiler flags cause a conflict because the stack protector
requires symbols that are in libc. Disable nolibc for now.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

0001-enable-libc.patch

@@ -0,0 +1,22 @@
+diff --git a/configure b/configure
+index 28f3eb0..9f7cff4 100755
+--- a/configure
++++ b/configure
+@@ -413,9 +413,15 @@ int main(void){
+ #endif
+ }
+ EOF
+-if compile_prog "" "" "nolibc support"; then
+-  liburing_nolibc="yes"
+-fi
++# Temporarily disable nolibc because false positives exist and compilation may
++# fail later. The issue is that compile_prog does not use the CFLAGS modified
++# for nolibc, so it cannot detect when nolibc won't work (e.g. due to the gcc
++# stack protector requiring __stack_chk_fail_local from libc on i686).
++#
++# if compile_prog "" "" "nolibc support"; then
++#   liburing_nolibc="yes"
++# fi
++liburing_nolibc="no"
+ print_config "nolibc support" "$liburing_nolibc";
+ #############################################################################

liburing.spec

@@ -1,10 +1,11 @@
 Name: liburing
 Version: 2.4
-Release: 1%{?dist}
+Release: 2%{?dist}
 Summary: Linux-native io_uring I/O access library
 License: (GPLv2 with exceptions and LGPLv2+) or MIT
 Source0: https://brick.kernel.dk/snaps/%{name}-%{version}.tar.gz
 Source1: https://brick.kernel.dk/snaps/%{name}-%{version}.tar.gz.asc
+Patch1: 0001-enable-libc.patch
 URL: https://git.kernel.dk/cgit/liburing/
 BuildRequires: gcc
 BuildRequires: gcc-c++
@@ -53,6 +54,9 @@ for the Linux-native io_uring.
 %{_mandir}/man7/*
 
 %changelog
+* Tue Jun 20 2023 Stefan Hajnoczi <stefanha@redhat.com> - 2.4-2
+- Fix i686 build failure due to nolibc conflict with stack protector.
+
 * Tue Jun 20 2023 Stefan Hajnoczi <stefanha@redhat.com> - 2.4-1
 - Update to liburing 2.4.