Bug in m4/ax_lib_hdf5.m4, AX_LIB_HDF5

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Hello,

I thought I submitted this patch before, but never received a reply.

When analyzing the output from `h5fc -show', which e.g. on my Linux
system is

gfortran -I/usr/include -L/usr/lib64 -lhdf5hl_fortran -lhdf5_hl -lhdf5_fortran -lhdf5

one would like to put all options of type -Ldirectory into variable
HDF5_FLIBS (for the linking flags) instead of HDF5_FFLAGS (for the
compilation flags).

The cause of the issue seems to be a copy&paste error.

The attached trivial & obvious patch fixes this.

Feel free to use it.

Thanks,
Harald

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 filename=0001-AX_LIB_HDF5-fix-derivation-of-compile-and-link-flags.patch
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=46rom 9bb09588d99d119ca0b9adbf7e69f370daf1b9f5 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <[email protected]>
Date: Tue, 22 Feb 2022 16:25:27 +0100
Subject: [PATCH] AX_LIB_HDF5: fix derivation of compile and link flags for
 Fortran

When analyzing the output from `h5fc -show`, add options of type -Ldir to
HDF5_FLIBS, not to HDF5_FFLAGS.
=2D--
 m4/ax_lib_hdf5.m4 | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/m4/ax_lib_hdf5.m4 b/m4/ax_lib_hdf5.m4
index 074c2a8..6b913d7 100644
=2D-- a/m4/ax_lib_hdf5.m4
+++ b/m4/ax_lib_hdf5.m4
@@ -88,7 +88,7 @@
 #   and this notice are preserved. This file is offered as-is, without an=
y
 #   warranty.

-#serial 20
+#serial 21

 AC_DEFUN([AX_LIB_HDF5], [

@@ -280,8 +280,8 @@ HDF5 support is being disabled (equivalent to --with-h=
df5=3Dno).
                 -I*) echo $HDF5_FFLAGS | $GREP -e "$arg" >/dev/null \
                       || HDF5_FFLAGS=3D"$HDF5_FFLAGS $arg"
                   ;;#(
-                -L*) echo $HDF5_FFLAGS | $GREP -e "$arg" >/dev/null \
-                      || HDF5_FFLAGS=3D"$HDF5_FFLAGS $arg"
+                -L*) echo $HDF5_FLIBS | $GREP -e "$arg" >/dev/null \
+                      || HDF5_FLIBS=3D"$HDF5_FLIBS $arg"
                      dnl HDF5 installs .mod files in with libraries,
                      dnl but some compilers need to find them with -I
                      echo $HDF5_FFLAGS | $GREP -e "-I${arg#-L}" >/dev/nul=
l \
=2D-
2.35.3


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