fix_gcc12_error (#52007)

* fix_gcc12_error

* patch on eigen3 for fixing gcc12 error

* Update multiary.cc

cmake/external/eigen.cmake

@@ -41,6 +41,22 @@ elseif(LINUX)
   endif()
 endif()
 
+if(CMAKE_COMPILER_IS_GNUCC)
+  execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpfullversion -dumpversion
+                  OUTPUT_VARIABLE GCC_VERSION)
+  string(REGEX MATCHALL "[0-9]+" GCC_VERSION_COMPONENTS ${GCC_VERSION})
+  list(GET GCC_VERSION_COMPONENTS 0 GCC_MAJOR)
+  list(GET GCC_VERSION_COMPONENTS 1 GCC_MINOR)
+  set(GCC_VERSION "${GCC_MAJOR}.${GCC_MINOR}")
+  if(GCC_VERSION GREATER_EQUAL "12.0")
+    file(TO_NATIVE_PATH ${PADDLE_SOURCE_DIR}/patches/eigen/Complex.h.patch
+         complex_header)
+    set(EIGEN_PATCH_COMMAND
+        patch -d ${EIGEN_SOURCE_DIR}/Eigen/src/Core/arch/SSE/ <
+        ${complex_header})
+  endif()
+endif()
+
 set(EIGEN_INCLUDE_DIR ${EIGEN_SOURCE_DIR})
 include_directories(${EIGEN_INCLUDE_DIR})
 

paddle/phi/infermeta/multiary.cc

@@ -2231,7 +2231,7 @@ void MultiDotInferMeta(const std::vector<const MetaTensor*>& x,
                         : phi::make_ddim({first_dim[0], last_dim[1]});
   }
 
-  auto width = first_dim[1];
+  auto width = first_dim.at(1);
   for (size_t i = 1; i < n - 1; i++) {
     PADDLE_ENFORCE_EQ(inputs_dims[i].size(),
                       static_cast<size_t>(2),

patches/eigen/Complex.h.patch

+diff --git a/Eigen/src/Core/arch/SSE/Complex.h b/Eigen/src/Core/arch/SSE/Complex.h
+index f6f1b8c..2f4e7d1 100644
+--- a/Eigen/src/Core/arch/SSE/Complex.h
++++ b/Eigen/src/Core/arch/SSE/Complex.h
+@@ -17,7 +17,7 @@ namespace internal {
+ //---------- float ----------
+ struct Packet2cf
+ {
+-  EIGEN_STRONG_INLINE Packet2cf() {}
++  EIGEN_STRONG_INLINE Packet2cf() :v(_mm_setzero_ps()) {}
+   EIGEN_STRONG_INLINE explicit Packet2cf(const __m128& a) : v(a) {}
+   __m128  v;
+ };