Backport: Port AC_F77_LIBRARY_LDFLAGS to oneAPI HPC Toolkit

When compiling with ifx, a ./configure script generated by GNU Autconf
reports an error message similar to:

    checking for Fortran 77 libraries of ifx...  -loopopt=0 \
        -L/lib/../lib64 -L/lib/../lib64/ -L/usr/lib/../lib64 \
        -L/usr/lib/../lib64/ -L/lib64 -L/lib/ -L/usr/lib64 -L/usr/lib \
        -lifport -lifcoremt -limf -lsvml -lm -lipgo -lirc -lpthread \
        -lirc_s  -ldl
    configure: WARNING: FLIBS does not work
    checking for ifx flag to add single underscore to external names... none
    checking for dummy main to link with Fortran 77 libraries... unknown
    configure: error: in '/path/to/build/dir':
    configure: error: linking to Fortran libraries from C fails
    See `config.log' for more details
    make: *** [build/config.status] Error 1

Examining the config.log file shows that the error causing ./configure to exit was:

    ld: cannot find -loopopt=0

The patch drops the first 2 parameters passed to clang, i.e.:
`-mllvm -loopopt=0` parameters are dropped when checking for the libraries.

Resolves: RHEL-40719

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

0001-Port-AC_F77_LIBRARY_LDFLAGS-to-oneAPI-HPC-Toolkit.patch

@@ -0,0 +1,31 @@
+From ae26b9b44c183c41b84fc36ff70082713295d621 Mon Sep 17 00:00:00 2001
+From: Paul Eggert <eggert@cs.ucla.edu>
+Date: Wed, 22 Jul 2020 12:56:19 -0700
+Subject: [PATCH] Port AC_F77_LIBRARY_LDFLAGS to oneAPI HPC Toolkit
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Problem reported by Bill Dieter in:
+https://lists.gnu.org/r/bug-autoconf/2020-07/msg00089.html
+* lib/autoconf/fortran.m4 (_AC_FC_LIBRARY_LDFLAGS):
+Defend against ‘clang -mllvm -loopopt=0’.
+---
+ lib/autoconf/fortran.m4 | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/lib/autoconf/fortran.m4 b/lib/autoconf/fortran.m4
+index 0a0c4168..59a8859b 100644
+--- a/lib/autoconf/fortran.m4
++++ b/lib/autoconf/fortran.m4
+@@ -698,6 +698,7 @@ while test $[@%:@] != 1; do
+ 	-zallextract*| -zdefaultextract)
+ 	  ac_cv_[]_AC_LANG_ABBREV[]_libs="$ac_cv_[]_AC_LANG_ABBREV[]_libs $ac_arg"
+ 	  ;;
++	-mllvm) ${2+shift};; # Defend against 'clang -mllvm -loopopt=0'.
+ 	  # Ignore everything else.
+   esac
+ done
+-- 
+2.45.0
+

autoconf.spec

@@ -6,7 +6,7 @@
 Summary:    A GNU tool for automatically configuring source code
 Name:       autoconf
 Version:    2.69
-Release:    29%{?dist}
+Release:    29%{?dist}.1
 License:    GPLv2+ and GFDL
 Source0:    http://ftpmirror.gnu.org/autoconf/autoconf-%{version}.tar.xz
 Source1:    config.site
@@ -14,6 +14,8 @@ Source2:    autoconf-init.el
 URL:        http://www.gnu.org/software/autoconf/
 
 Patch1:     autoconf-2.69-perl-5.22-autoscan.patch
+# Backport: see RHEL-40719
+Patch2:     0001-Port-AC_F77_LIBRARY_LDFLAGS-to-oneAPI-HPC-Toolkit.patch
 
 BuildArch:  noarch
 
@@ -135,6 +137,9 @@ fi
 
 
 %changelog
+* Wed Jun 12 2024 Frederic Berat <fberat@redhat.com> - 2.69-29.1
+- Fix issues with Fortran detection and oneAPI HPC Toolkit (RHEL-40719)
+
 * Mon Jun 28 2021 Honza Horak <hhorak@redhat.com> - 2.69-29
 - Bump release number to avoid installing reverted RPM in CStream
   Resolves: #1956598