taskflow: add pkg-config config file (#512193)

pkgs/by-name/ta/taskflow/add-pkg-config-support.patch

@@ -0,0 +1,31 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 063fd793..99998a6b 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -377,3 +377,13 @@ install(
+   DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
+ )
+ 
++
++# -----------------------------------------------------------------------------
++# pkg-config
++# -----------------------------------------------------------------------------
++
++configure_file(taskflow.pc.in taskflow.pc @ONLY)
++install(
++  FILES ${CMAKE_CURRENT_BINARY_DIR}/taskflow.pc
++  DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
++)
+diff --git a/taskflow.pc.in b/taskflow.pc.in
+new file mode 100644
+index 00000000..fc649288
+--- /dev/null
++++ b/taskflow.pc.in
+@@ -0,0 +1,7 @@
++prefix=@CMAKE_INSTALL_PREFIX@
++includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
++
++Name: Taskflow
++Description: A General-purpose Task-parallel Programming System
++Version: @PROJECT_VERSION@
++Cflags: -I${includedir}

pkgs/by-name/ta/taskflow/package.nix

@@ -2,6 +2,7 @@
   cmake,
   doctest,
   fetchFromGitHub,
+  fetchpatch,
   lib,
   replaceVars,
   stdenv,
@@ -22,6 +23,19 @@ stdenv.mkDerivation (finalAttrs: {
     (replaceVars ./unvendor-doctest.patch {
       inherit doctest;
     })
+
+    # https://github.com/taskflow/taskflow/pull/785
+    # TODO: remove when updating to the next release
+    (fetchpatch {
+      name = "fix-brace-init-with-explicit-constructor-for-GCC-15";
+      url = "https://github.com/taskflow/taskflow/commit/de7dfe30594cd1f98398095b970a8320734a2382.patch";
+      hash = "sha256-Ecl7dFvf2HDslv/5IHR5J2PYcRCN3EA4GahxOzcUS4g=";
+    })
+
+    # Vendored from #786 as it does not apply cleanly on top of v0.4.0
+    # https://github.com/taskflow/taskflow/pull/786
+    # TODO: remove when updating to the next release
+    ./add-pkg-config-support.patch
   ];
 
   postPatch = ''