diff --git a/pkgs/development/compilers/halide/default.nix b/pkgs/development/compilers/halide/default.nix
index a21fdd937d4d63..83cf5120850dee 100644
--- a/pkgs/development/compilers/halide/default.nix
+++ b/pkgs/development/compilers/halide/default.nix
@@ -4,6 +4,7 @@
   lib,
   fetchFromGitHub,
   cmake,
+  fetchpatch,
   flatbuffers,
   libffi,
   libpng,
@@ -14,48 +15,78 @@
   openblas,
   blas,
   lapack,
+  removeReferencesTo,
+  ninja,
   pythonSupport ? false,
   python3Packages ? null,
+  wasmSupport ? false,
+  wabt,
+  doCheck ? true,
 }:
 
 assert blas.implementation == "openblas" && lapack.implementation == "openblas";
 
 stdenv.mkDerivation rec {
   pname = "halide";
-  version = "18.0.0";
+  version = "19.0.0";
 
   src = fetchFromGitHub {
     owner = "halide";
     repo = "Halide";
     rev = "v${version}";
-    hash = "sha256-BPalUh9EgdCqVaWC1HoreyyRcPQc4QMIYnLrRoNDDCI=";
+    hash = "sha256-0SFGX4G6UR8NS4UsdFOb99IBq2/hEkr/Cm2p6zkIh/8=";
   };
 
-  postPatch = ''
-    # See https://github.com/halide/Halide/issues/7785
-    substituteInPlace 'src/runtime/HalideRuntime.h' \
-      --replace '#if defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__)
-    #define HALIDE_CPP_COMPILER_HAS_FLOAT16' \
-                '#if defined(__x86_64__) || defined(__i386__)
-    #define HALIDE_CPP_COMPILER_HAS_FLOAT16'
-  '';
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/halide/Halide/commit/ac2cd23951aff9ac3b765e51938f1e576f1f0ee9.diff";
+      hash = "sha256-kHUecmmcz/4wLGAyo7NHHF3gMBDxPvhUH8vSC/n+Pd0=";
+    })
+    (fetchpatch {
+      url = "https://github.com/halide/Halide/commit/59f4fff30f4ab628da9aa7e5f77a7f1bb218a779.diff";
+      hash = "sha256-r+InpY1kDWeqWJUqbynFfwZZmnHG+fo3CVdAUlYCvcA=";
+    })
+  ];
+
+  postPatch =
+    ''
+      substituteInPlace src/runtime/CMakeLists.txt --replace-fail \
+          '-isystem "''${VulkanHeaders_INCLUDE_DIR}"' \
+          '-isystem "''${VulkanHeaders_INCLUDE_DIR}"
+           -isystem "${llvmPackages.clang}/resource-root/include"'
+    ''
+    # Upstream Halide include a check in their CMake files that forces Halide to
+    # link LLVM dynamically because of WebAssembly. It unnecessarily increases
+    # the closure size in cases when the WebAssembly target is not used. Hence,
+    # the following hack
+    + lib.optionalString (!wasmSupport) ''
+      substituteInPlace cmake/FindHalide_LLVM.cmake --replace-fail \
+          'if (comp STREQUAL "WebAssembly")' \
+          'if (FALSE)'
+    '';
 
   cmakeFlags = [
-    "-DWARNINGS_AS_ERRORS=OFF"
     "-DWITH_PYTHON_BINDINGS=${if pythonSupport then "ON" else "OFF"}"
-    "-DTARGET_WEBASSEMBLY=OFF"
+    "-DWITH_TESTS=${if doCheck then "ON" else "OFF"}"
+    "-DWITH_TUTORIALS=${if doCheck then "ON" else "OFF"}"
     # Disable performance tests since they may fail on busy machines
     "-DWITH_TEST_PERFORMANCE=OFF"
     # Disable fuzzing tests -- this has become the default upstream after the
     # v16 release (See https://github.com/halide/Halide/commit/09c5d1d19ec8e6280ccbc01a8a12decfb27226ba)
     # These tests also fail to compile on Darwin because of some missing command line options...
     "-DWITH_TEST_FUZZ=OFF"
-    # Disable FetchContent for flatbuffers and use the version from nixpkgs instead
-    "-DFLATBUFFERS_USE_FETCHCONTENT=OFF"
-    "-DPYBIND11_USE_FETCHCONTENT=OFF"
+    # Disable FetchContent and use versions from nixpkgs instead
+    "-DHalide_USE_FETCHCONTENT=OFF"
+    "-DHalide_WASM_BACKEND=${if wasmSupport then "wabt" else "OFF"}"
+    "-DHalide_LLVM_SHARED_LIBS=${if wasmSupport then "ON" else "OFF"}"
   ];
 
-  doCheck = true;
+  outputs = [
+    "out"
+    "lib"
+  ];
+
+  inherit doCheck;
 
   preCheck =
     let
@@ -73,11 +104,18 @@ stdenv.mkDerivation rec {
       checkFlagsArray+=("ARGS=-E '${disabledTests}'")
     '';
 
-  postInstall = lib.optionalString pythonSupport ''
-    mkdir -p $out/${builtins.dirOf python3Packages.python.sitePackages}
-    mv -v $out/lib/python3/site-packages $out/${python3Packages.python.sitePackages}
-    rmdir $out/lib/python3/
-  '';
+  postInstall =
+    lib.optionalString pythonSupport ''
+      mkdir -p $lib/${builtins.dirOf python3Packages.python.sitePackages}
+      mv -v $lib/lib/python3/site-packages $lib/${python3Packages.python.sitePackages}
+      rmdir $lib/lib/python3/
+    ''
+    # Debug symbols in the runtime include references to clang, but they're not
+    # required for running the code. llvmPackages.clang increases the runtime
+    # closure by at least a GB which is a waste, so we remove references to clang.
+    + lib.optionalString (stdenv != llvmPackages.stdenv) ''
+      remove-references-to -t ${llvmPackages.clang} $lib/lib/libHalide*
+    '';
 
   # Note: only openblas and not atlas part of this Nix expression
   # see pkgs/development/libraries/science/math/liblapack/3.5.0.nix
@@ -97,12 +135,15 @@ stdenv.mkDerivation rec {
     ++ lib.optionals (!stdenv.hostPlatform.isDarwin) [
       libgbm
       libGL
-    ];
+    ]
+    ++ lib.optionals wasmSupport [ wabt ];
 
   nativeBuildInputs =
     [
       cmake
       flatbuffers
+      removeReferencesTo
+      ninja
     ]
     ++ lib.optionals pythonSupport [
       python3Packages.python
@@ -124,5 +165,6 @@ stdenv.mkDerivation rec {
       atila
       twesterhout
     ];
+    broken = !stdenv.buildPlatform.canExecute stdenv.hostPlatform;
   };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a7ba597d8c07e6..080715fa998cc9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3621,7 +3621,7 @@ with pkgs;
   hal-hardware-analyzer = libsForQt5.callPackage ../applications/science/electronics/hal-hardware-analyzer { };
 
   halide = callPackage ../development/compilers/halide {
-    llvmPackages = llvmPackages_18;
+    llvmPackages = llvmPackages_19;
   };
 
   hareThirdParty = recurseIntoAttrs (callPackage ./hare-third-party.nix { });
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 9dbb671c5b2b25..ab024ea28bbc99 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -5769,7 +5769,7 @@ self: super: with self; {
 
   hakuin = callPackage ../development/python-modules/hakuin { };
 
-  halide = toPythonModule (pkgs.halide.override { pythonSupport = true; python3Packages = self; });
+  halide = toPythonModule (pkgs.halide.override { pythonSupport = true; python3Packages = self; }).lib;
 
   halo = callPackage ../development/python-modules/halo { };