sci-libs/libsemigroups: fix the test suite build with gcc-15

Signed-off-by: Michael Orlitzky <mjo@gentoo.org>

sci-libs/libsemigroups/files/libsemigroups-3.0.2-gcc15-testfix.patch

@@ -0,0 +1,34 @@
+From 2575288a19cc9f75f239b777b327e0807debb62d Mon Sep 17 00:00:00 2001
+From: "James D. Mitchell" <jdm3@st-andrews.ac.uk>
+Date: Mon, 7 Apr 2025 14:30:27 +0200
+Subject: [PATCH] Try to resolve #557
+
+---
+ include/libsemigroups/detail/todd-coxeter-impl.hpp | 11 +++++++----
+ 1 file changed, 7 insertions(+), 4 deletions(-)
+
+diff --git a/include/libsemigroups/detail/todd-coxeter-impl.hpp b/include/libsemigroups/detail/todd-coxeter-impl.hpp
+index a8e66af50..253b0ba19 100644
+--- a/include/libsemigroups/detail/todd-coxeter-impl.hpp
++++ b/include/libsemigroups/detail/todd-coxeter-impl.hpp
+@@ -505,13 +505,16 @@ namespace libsemigroups {
+       ////////////////////////////////////////////////////////////////////////
+ 
+ #ifndef LIBSEMIGROUPS_PARSED_BY_DOXYGEN
+-      // This is documented in Runner, so we don't duplicate the doc here.
+-      template <typename T>
+-      void report_every(T val) {
++      // This is documented in Reporter, so we don't duplicate the doc here.
++      template <typename Time>
++      void report_every(Time val) {
+         detail::CongruenceCommon::report_every(val);
+         _word_graph.report_every(val);
+       }
+-      using Reporter::report_every;
++
++      [[nodiscard]] nanoseconds report_every() const noexcept {
++        return Reporter::report_every();
++      }
+ #endif
+ 
+       //! \ingroup todd_coxeter_class_settings_group

sci-libs/libsemigroups/libsemigroups-3.0.2.ebuild

@@ -24,6 +24,8 @@ BDEPEND="eigen? ( dev-cpp/eigen )"
 DEPEND="dev-libs/libfmt"
 RDEPEND="${DEPEND}"
 
+PATCHES=( "${FILESDIR}/${P}-gcc15-testfix.patch" )
+
 src_prepare() {
 	# Remove bundled deps that we should not be using.
 	rm -rf third_party/fmt-* \