Bug#1139617: freefem++: FTBFS against HDF5 2.1.0

[Gilles Filippini]

Source: freefem++
Version: 4.15+dfsg-2
Severity: important
Tags: ftbfs patch

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Hash: SHA512

Hi,

During a test rebuild of HDF5's reverse dependencies against HDF5 2.1.0
currently in experimental, freefem++ FTBFS because its build toolchain
doesn't support this new major release.

The attached patch is a workaround for this issue and supports both
HDF5 1.14.6 in unstable and HDF5 2.1.0 in experimental.

Best,
_g.


- -- System Information:
Debian Release: 12.0
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-44-amd64 (SMP w/12 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

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diff -Nru freefem++-4.15+dfsg/debian/changelog freefem++-4.15+dfsg/debian/changelog
--- freefem++-4.15+dfsg/debian/changelog	2025-10-05 18:31:30.000000000 +0200
+++ freefem++-4.15+dfsg/debian/changelog	2026-06-06 10:13:03.000000000 +0200
@@ -1,3 +1,10 @@
+freefem++ (4.15+dfsg-2.1) UNRELEASED; urgency=medium
+
+  * Non-maintainer upload.
+  * Fix FTBFS against HDF5 2.1.0
+
+ -- Gilles Filippini <pini at debian.org>  Sat, 06 Jun 2026 10:13:03 +0200
+
 freefem++ (4.15+dfsg-2) unstable; urgency=medium
 
   * Team upload.
diff -Nru freefem++-4.15+dfsg/debian/patches/hdf5-2.1.0.patch freefem++-4.15+dfsg/debian/patches/hdf5-2.1.0.patch
--- freefem++-4.15+dfsg/debian/patches/hdf5-2.1.0.patch	1970-01-01 01:00:00.000000000 +0100
+++ freefem++-4.15+dfsg/debian/patches/hdf5-2.1.0.patch	2026-06-06 10:13:03.000000000 +0200
@@ -0,0 +1,42 @@
+Index: freefem++-4.15+dfsg/etc/config/m4/ax_lib_hdf5.m4
+===================================================================
+--- freefem++-4.15+dfsg.orig/etc/config/m4/ax_lib_hdf5.m4
++++ freefem++-4.15+dfsg/etc/config/m4/ax_lib_hdf5.m4
+@@ -239,7 +239,15 @@ HDF5 support is being disabled (equivale
+           esac
+         done
+ 
+-        HDF5_LIBS="-lhdf5 $HDF5_LIBS"
++        HDF5_LIBS="${HDF5_LIBS#"${HDF5_LIBS%%[![:space:]]*}"}"
++        HDF5_INFIX=
++        case "$HDF5_LIBS" in
++            -lhdf5_*)
++                HDF5_INFIX="${HDF5_LIBS#-lhdf5_}"
++                HDF5_INFIX="_${HDF5_INFIX%%_*}"
++                ;;
++        esac
++        HDF5_LIBS="-lhdf5$HDF5_INFIX $HDF5_LIBS"
+         AC_MSG_RESULT([yes (version $[HDF5_VERSION])])
+ 
+         dnl See if we can compile
+@@ -259,7 +267,7 @@ HDF5 support is being disabled (equivale
+           AC_MSG_WARN([Unable to compile HDF5 test program])
+         fi
+         dnl Look for HDF5's high level library H5PTcreate
+-		AC_CHECK_LIB([hdf5_hl],[H5PTcreate], [HDF5_LIBS="-lhdf5_hl $HDF5_LIBS"], [], [])
++		AC_CHECK_LIB([hdf5${HDF5_INFIX}_hl],[H5PTcreate], [HDF5_LIBS="-lhdf5${HDF5_INFIX}_hl $HDF5_LIBS"], [], [])
+ 
+         CC=$ax_lib_hdf5_save_CC
+         CPPFLAGS=$ax_lib_hdf5_save_CPPFLAGS
+@@ -296,9 +304,9 @@ HDF5 support is being disabled (equivale
+             for arg in $HDF5_LIBS
+             do
+               case "$arg" in #(
+-                -lhdf5_hl) HDF5_FLIBS="$HDF5_FLIBS -lhdf5hl_fortran $arg"
++                -lhdf5${HDF5_INFIX}_hl) HDF5_FLIBS="$HDF5_FLIBS -lhdf5${HDF5_INFIX}_hl_fortran $arg"
+                   ;; #(
+-                -lhdf5)    HDF5_FLIBS="$HDF5_FLIBS -lhdf5_fortran $arg"
++                -lhdf5${HDF5_INFIX})    HDF5_FLIBS="$HDF5_FLIBS -lhdf5${HDF5_INFIX}_fortran $arg"
+                   ;; #(
+                 *) HDF5_FLIBS="$HDF5_FLIBS $arg"
+                   ;;
diff -Nru freefem++-4.15+dfsg/debian/patches/series freefem++-4.15+dfsg/debian/patches/series
--- freefem++-4.15+dfsg/debian/patches/series	2025-10-05 18:31:30.000000000 +0200
+++ freefem++-4.15+dfsg/debian/patches/series	2026-06-06 10:13:03.000000000 +0200
@@ -3,3 +3,4 @@
 fix_package_name_in_config_h.patch
 fix_include_path.patch
 ignore_invalid_hdf5_flags.patch
+hdf5-2.1.0.patch