vcpkg(mfx-dispatch): run explicit autotools chain; skip vcpkg AUTOCONFIG

res/vcpkg/mfx-dispatch/portfile.cmake

@@ -18,29 +18,6 @@ vcpkg_from_github(
         ${MISSING_CSTDINT_IMPORT_PATCH}
 )
 
-# mfx_dispatch's configure.ac uses LT_INIT, but autoreconf 1.17+ (Debian 13,
-# Ubuntu 24.04+) sometimes fails to trace it -- reporting "not using Libtool"
-# and skipping libtoolize. When libtoolize doesn't run, libtool's m4 macros
-# never get installed into the source tree, and automake then fails with
-# "Libtool library used but 'LIBTOOL' is undefined" on Makefile.am:7.
-#
-# Force libtoolize to run before autoreconf so the m4 macros are guaranteed
-# to be present regardless of autoreconf's introspection result.
-if(NOT VCPKG_TARGET_IS_WINDOWS OR VCPKG_TARGET_IS_MINGW)
-    find_program(LIBTOOLIZE NAMES libtoolize glibtoolize)
-    if(LIBTOOLIZE)
-        message(STATUS "mfx-dispatch: pre-running libtoolize to install libtool m4 macros")
-        file(MAKE_DIRECTORY "${SOURCE_PATH}/m4")
-        vcpkg_execute_required_process(
-            COMMAND "${LIBTOOLIZE}" --force --copy --install
-            WORKING_DIRECTORY "${SOURCE_PATH}"
-            LOGNAME "libtoolize-${TARGET_TRIPLET}"
-        )
-    else()
-        message(WARNING "libtoolize not found; mfx-dispatch build is likely to fail")
-    endif()
-endif()
-
 if(VCPKG_TARGET_IS_WINDOWS AND NOT VCPKG_TARGET_IS_MINGW)
     vcpkg_cmake_configure(
         SOURCE_PATH "${SOURCE_PATH}"
@@ -48,12 +25,58 @@ if(VCPKG_TARGET_IS_WINDOWS AND NOT VCPKG_TARGET_IS_MINGW)
     vcpkg_cmake_install()
     vcpkg_copy_pdbs()
 else()
+    # autotools 1.17+ (Debian 13, Ubuntu 24.04+) has a tracing bug: even though
+    # configure.ac calls LT_INIT, autoreconf reports "configure.ac: not using
+    # Libtool" and skips libtoolize, leaving libtool's m4 macros uninstalled.
+    # automake then fails with "Libtool library used but 'LIBTOOL' is undefined".
+    #
+    # Running libtoolize *before* `autoreconf -vfi` doesn't help because the -i
+    # flag has autoreconf re-introspect and clean things up, undoing libtoolize.
+    # Solution: run the full autotools chain ourselves, in order, with libtoolize
+    # before aclocal, then call vcpkg_configure_make *without* AUTOCONFIG so it
+    # uses the configure script we produced.
+    file(MAKE_DIRECTORY "${SOURCE_PATH}/m4")
+
+    find_program(LIBTOOLIZE NAMES libtoolize glibtoolize REQUIRED)
+    find_program(ACLOCAL    NAMES aclocal               REQUIRED)
+    find_program(AUTOCONF   NAMES autoconf              REQUIRED)
+    find_program(AUTOMAKE   NAMES automake              REQUIRED)
+    message(STATUS "mfx-dispatch: running explicit autotools chain")
+    message(STATUS "  libtoolize: ${LIBTOOLIZE}")
+    message(STATUS "  aclocal   : ${ACLOCAL}")
+    message(STATUS "  autoconf  : ${AUTOCONF}")
+    message(STATUS "  automake  : ${AUTOMAKE}")
+
+    vcpkg_execute_required_process(
+        COMMAND "${LIBTOOLIZE}" --force --copy --install
+        WORKING_DIRECTORY "${SOURCE_PATH}"
+        LOGNAME "step1-libtoolize-${TARGET_TRIPLET}")
+    if(NOT EXISTS "${SOURCE_PATH}/m4/libtool.m4")
+        message(FATAL_ERROR "libtoolize did not produce ${SOURCE_PATH}/m4/libtool.m4 -- libtool package missing or broken")
+    endif()
+
+    vcpkg_execute_required_process(
+        COMMAND "${ACLOCAL}" --force -I m4
+        WORKING_DIRECTORY "${SOURCE_PATH}"
+        LOGNAME "step2-aclocal-${TARGET_TRIPLET}")
+
+    vcpkg_execute_required_process(
+        COMMAND "${AUTOCONF}" --force
+        WORKING_DIRECTORY "${SOURCE_PATH}"
+        LOGNAME "step3-autoconf-${TARGET_TRIPLET}")
+
+    vcpkg_execute_required_process(
+        COMMAND "${AUTOMAKE}" --add-missing --copy --force-missing
+        WORKING_DIRECTORY "${SOURCE_PATH}"
+        LOGNAME "step4-automake-${TARGET_TRIPLET}")
+
     if(VCPKG_TARGET_IS_MINGW)
         vcpkg_check_linkage(ONLY_STATIC_LIBRARY)
     endif()
     vcpkg_configure_make(
         SOURCE_PATH "${SOURCE_PATH}"
-        AUTOCONFIG
+        # NOT AUTOCONFIG -- we ran the chain manually above. Letting vcpkg
+        # rerun autoreconf -vfi would re-trigger the broken introspection.
     )
     vcpkg_install_make()
 endif()