diff --git a/CMake/ClangCompilers.cmake b/CMake/ClangCompilers.cmake
index 3930afc3fb..bed72d755d 100644
--- a/CMake/ClangCompilers.cmake
+++ b/CMake/ClangCompilers.cmake
@@ -36,7 +36,7 @@ endif(QMC_OMP)
 add_definitions(-Drestrict=__restrict__)
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstrict-aliasing")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstrict-aliasing -D__forceinline=inline")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstrict-aliasing")
 
 # treat VLA as error
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Werror=vla")
diff --git a/CMake/GNUCompilers.cmake b/CMake/GNUCompilers.cmake
index 5df6cfafa9..1937c98f82 100644
--- a/CMake/GNUCompilers.cmake
+++ b/CMake/GNUCompilers.cmake
@@ -21,7 +21,7 @@ add_definitions(-Drestrict=__restrict__)
 
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -finline-limit=1000 -fstrict-aliasing -funroll-all-loops")
 set(CMAKE_CXX_FLAGS
-    "${CMAKE_CXX_FLAGS} -finline-limit=1000 -fstrict-aliasing -funroll-all-loops -D__forceinline=inline")
+    "${CMAKE_CXX_FLAGS} -finline-limit=1000 -fstrict-aliasing -funroll-all-loops")
 
 set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -fno-omit-frame-pointer")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fno-omit-frame-pointer")
diff --git a/CMake/IBMCompilers.cmake b/CMake/IBMCompilers.cmake
index 0279a0855d..60e40ce3ea 100644
--- a/CMake/IBMCompilers.cmake
+++ b/CMake/IBMCompilers.cmake
@@ -12,8 +12,6 @@ if(CMAKE_SYSTEM_PROCESSOR MATCHES "ppc64le")
     set(CMAKE_CXX_FLAGS "")
   endif()
 
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__forceinline=inline")
-
   # Suppress compile warnings
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-deprecated -Wno-unused-value")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-deprecated -Wno-unused-value")
diff --git a/CMake/IntelCompilers.cmake b/CMake/IntelCompilers.cmake
index def9f60c53..77897ab510 100644
--- a/CMake/IntelCompilers.cmake
+++ b/CMake/IntelCompilers.cmake
@@ -40,7 +40,7 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "IntelLLVM" OR INTEL_ONEAPI_COMPILER_FOUND)
   add_compile_definitions(restrict=__restrict__)
 
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fstrict-aliasing")
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstrict-aliasing -D__forceinline=inline")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstrict-aliasing")
 
   # Force frame-pointer kept in DEBUG build.
   set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -fno-omit-frame-pointer")
diff --git a/CMake/NVHPCCompilers.cmake b/CMake/NVHPCCompilers.cmake
index bb502169c2..6acb60d496 100644
--- a/CMake/NVHPCCompilers.cmake
+++ b/CMake/NVHPCCompilers.cmake
@@ -20,9 +20,6 @@ endif(QMC_OMP)
 
 add_definitions(-Drestrict=__restrict__)
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D__forceinline=inline")
-
 # Suppress compile warnings
 # 177 variable "XX" was declared but never referenced
 # 550 variable "XX" was set but never used
diff --git a/src/Containers/OhmmsSoA/TensorSoaContainer.h b/src/Containers/OhmmsSoA/TensorSoaContainer.h
index 38f0fd9e93..b18b4c68bc 100644
--- a/src/Containers/OhmmsSoA/TensorSoaContainer.h
+++ b/src/Containers/OhmmsSoA/TensorSoaContainer.h
@@ -59,7 +59,7 @@ struct TensorSoaContainer<T, 3>
 
   ~TensorSoaContainer() = default;
 
-  __forceinline void resize(int n)
+  inline void resize(int n)
   {
     nLocal  = n;
     nGhosts = getAlignedSize<T>(n);
@@ -68,7 +68,7 @@ struct TensorSoaContainer<T, 3>
 
   /** return TinyVector<T,3>
        */
-  __forceinline Tensor<T, 3> operator[](int i) const
+  inline Tensor<T, 3> operator[](int i) const
   {
     const T* restrict b = m_data + i;
     T xx                = *(b);
@@ -87,10 +87,10 @@ struct TensorSoaContainer<T, 3>
     T* _base;
     Accessor()                = delete;
     Accessor(const Accessor&) = delete;
-    __forceinline Accessor(T* a, int ng) : _base(a), M(ng) {}
+    inline Accessor(T* a, int ng) : _base(a), M(ng) {}
 
     template<unsigned D>
-    __forceinline Accessor& operator=(const Tensor<T, D>& rhs)
+    inline Accessor& operator=(const Tensor<T, D>& rhs)
     {
       *_base           = rhs(0);
       *(_base + M)     = rhs(1);
@@ -103,7 +103,7 @@ struct TensorSoaContainer<T, 3>
 
     /** assign value */
     template<typename T1>
-    __forceinline Accessor& operator=(T1 rhs)
+    inline Accessor& operator=(T1 rhs)
     {
       *_base           = rhs;
       *(_base + M)     = rhs;
@@ -119,20 +119,20 @@ struct TensorSoaContainer<T, 3>
        *
        * Use for (*this)[i]=Tensor<T,3>;
        */
-  __forceinline Accessor operator()(int i) { return Accessor(m_data.data() + i, nGhosts); }
+  inline Accessor operator()(int i) { return Accessor(m_data.data() + i, nGhosts); }
 
   ///return the base
-  __forceinline T* data() { return m_data.data(); }
+  inline T* data() { return m_data.data(); }
   ///return the base
-  __forceinline const T* data() const { return m_data.data(); }
+  inline const T* data() const { return m_data.data(); }
   ///return the base of XX components
-  __forceinline T* restrict data(int i, int j)
+  inline T* restrict data(int i, int j)
   {
     const int n = (i < j) ? i * 3 + j : j * 3 + i;
     return m_data().data() + n * nGhosts;
   }
   ///return the base of XX components
-  __forceinline const T* restrict data(int i, int j) const
+  inline const T* restrict data(int i, int j) const
   {
     const int n = (i < j) ? i * 3 + j : j * 3 + i;
     return m_data().data() + n * nGhosts;
diff --git a/src/Containers/OhmmsSoA/VectorSoaContainer.h b/src/Containers/OhmmsSoA/VectorSoaContainer.h
index 7745b2b6dd..40f0021139 100644
--- a/src/Containers/OhmmsSoA/VectorSoaContainer.h
+++ b/src/Containers/OhmmsSoA/VectorSoaContainer.h
@@ -111,7 +111,7 @@ struct VectorSoaContainer
    *
    * nAllocated is used to ensure no memory leak
    */
-  __forceinline void resize(size_t n)
+  inline void resize(size_t n)
   {
     static_assert(std::is_same<Element_t, typename Alloc::value_type>::value,
                   "VectorSoaContainer and Alloc data types must agree!");
@@ -144,7 +144,7 @@ struct VectorSoaContainer
   }
 
   /// free allocated memory and clear status variables
-  __forceinline void free()
+  inline void free()
   {
     if (nAllocated)
       mAllocator.deallocate(myData, nAllocated);
@@ -161,7 +161,7 @@ struct VectorSoaContainer
    *
    * To attach to existing memory, currently owned memory must be freed before calling attachReference
    */
-  __forceinline void attachReference(size_t n, size_t n_padded, T* ptr)
+  inline void attachReference(size_t n, size_t n_padded, T* ptr)
   {
     if (nAllocated)
     {
@@ -200,9 +200,9 @@ struct VectorSoaContainer
   }
 
   ///return the physical size
-  __forceinline size_t size() const { return nLocal; }
+  inline size_t size() const { return nLocal; }
   ///return the physical size
-  __forceinline size_t capacity() const { return nGhosts; }
+  inline size_t capacity() const { return nGhosts; }
 
   /** AoS to SoA : copy from Vector<TinyVector<>>
        *
@@ -227,16 +227,16 @@ struct VectorSoaContainer
 
   /** return TinyVector<T,D>
        */
-  __forceinline const AoSElement_t operator[](size_t i) const { return AoSElement_t(myData + i, nGhosts); }
+  inline const AoSElement_t operator[](size_t i) const { return AoSElement_t(myData + i, nGhosts); }
 
   ///helper class for operator ()(size_t i) to assign a value
   struct Accessor
   {
     T* _base;
     size_t M;
-    __forceinline Accessor(T* a, size_t ng) : _base(a), M(ng) {}
+    inline Accessor(T* a, size_t ng) : _base(a), M(ng) {}
     template<typename T1>
-    __forceinline Accessor& operator=(const TinyVector<T1, D>& rhs)
+    inline Accessor& operator=(const TinyVector<T1, D>& rhs)
     {
 #pragma unroll
       for (size_t i = 0; i < D; ++i)
@@ -246,7 +246,7 @@ struct VectorSoaContainer
 
     /** assign value */
     template<typename T1>
-    __forceinline Accessor& operator=(T1 rhs)
+    inline Accessor& operator=(T1 rhs)
     {
 #pragma unroll
       for (size_t i = 0; i < D; ++i)
@@ -259,44 +259,44 @@ struct VectorSoaContainer
        *
        * Use for (*this)[i]=TinyVector<T,D>;
        */
-  __forceinline Accessor operator()(size_t i) { return Accessor(myData + i, nGhosts); }
+  inline Accessor operator()(size_t i) { return Accessor(myData + i, nGhosts); }
   ///return the base
-  __forceinline T* data() { return myData; }
+  inline T* data() { return myData; }
   ///return the base
-  __forceinline const T* data() const { return myData; }
+  inline const T* data() const { return myData; }
   /// return non_const data
   T* getNonConstData() const { return myData; }
   ///return the pointer of the i-th components
-  __forceinline T* restrict data(size_t i) { return myData + i * nGhosts; }
+  inline T* restrict data(size_t i) { return myData + i * nGhosts; }
   ///return the const pointer of the i-th components
-  __forceinline const T* restrict data(size_t i) const { return myData + i * nGhosts; }
+  inline const T* restrict data(size_t i) const { return myData + i * nGhosts; }
   ///return the end
-  __forceinline T* end() { return myData + D * nGhosts; }
+  inline T* end() { return myData + D * nGhosts; }
   ///return the end
-  __forceinline const T* end() const { return myData + D * nGhosts; }
+  inline const T* end() const { return myData + D * nGhosts; }
 
 
   ///return the base, device
   template<typename Allocator = Alloc, typename = IsDualSpace<Allocator>>
-  __forceinline T* device_data()
+  inline T* device_data()
   {
     return mAllocator.get_device_ptr();
   }
   ///return the base, device
   template<typename Allocator = Alloc, typename = IsDualSpace<Allocator>>
-  __forceinline const T* device_data() const
+  inline const T* device_data() const
   {
     return mAllocator.get_device_ptr();
   }
   ///return the pointer of the i-th components, device
   template<typename Allocator = Alloc, typename = IsDualSpace<Allocator>>
-  __forceinline T* restrict device_data(size_t i)
+  inline T* restrict device_data(size_t i)
   {
     return mAllocator.get_device_ptr() + i * nGhosts;
   }
   ///return the const pointer of the i-th components, device
   template<typename Allocator = Alloc, typename = IsDualSpace<Allocator>>
-  __forceinline const T* restrict device_data(size_t i) const
+  inline const T* restrict device_data(size_t i) const
   {
     return mAllocator.get_device_ptr() + i * nGhosts;
   }
diff --git a/src/QMCTools/DiracParser.h b/src/QMCTools/DiracParser.h
index dbf1398d86..53ba1ae909 100644
--- a/src/QMCTools/DiracParser.h
+++ b/src/QMCTools/DiracParser.h
@@ -50,7 +50,7 @@ class DiracParser : public QMCGaussianParserBase, public OhmmsAsciiParser
 
 public:
   DiracParser(int argc, char** argv);
-  void parse(const std::string& fname);
+  void parse(const std::string& fname) override;
 
 private:
   void dumpHDF5(const std::string& fname);
diff --git a/src/spline2/MultiBsplineEval.hpp b/src/spline2/MultiBsplineEval.hpp
index 8cea6e6feb..afb8327544 100644
--- a/src/spline2/MultiBsplineEval.hpp
+++ b/src/spline2/MultiBsplineEval.hpp
@@ -40,26 +40,26 @@ namespace spline2
 {
 /// evaluate values optionally in the range [first,last)
 template<typename SPLINET, typename PT, typename VT>
-__forceinline void evaluate3d(const SPLINET& spline, const PT& r, VT& psi)
+inline void evaluate3d(const SPLINET& spline, const PT& r, VT& psi)
 {
   evaluate_v_impl(spline, r[0], r[1], r[2], psi.data(), 0, psi.size());
 }
 
 template<typename SPLINET, typename PT, typename VT>
-__forceinline void evaluate3d(const SPLINET& spline, const PT& r, VT& psi, int first, int last)
+inline void evaluate3d(const SPLINET& spline, const PT& r, VT& psi, int first, int last)
 {
   evaluate_v_impl(spline, r[0], r[1], r[2], psi.data() + first, first, last);
 }
 
 /// evaluate values, gradients, laplacians optionally in the range [first,last)
 template<typename SPLINET, typename PT, typename VT, typename GT, typename LT>
-__forceinline void evaluate3d_vgl(const SPLINET& spline, const PT& r, VT& psi, GT& grad, LT& lap)
+inline void evaluate3d_vgl(const SPLINET& spline, const PT& r, VT& psi, GT& grad, LT& lap)
 {
   evaluate_vgl_impl(spline, r[0], r[1], r[2], psi.data(), grad.data(), lap.data(), psi.size(), 0, psi.size());
 }
 
 template<typename SPLINET, typename PT, typename VT, typename GT, typename LT>
-__forceinline void evaluate3d_vgl(const SPLINET& spline, const PT& r, VT& psi, GT& grad, LT& lap, int first, int last)
+inline void evaluate3d_vgl(const SPLINET& spline, const PT& r, VT& psi, GT& grad, LT& lap, int first, int last)
 {
   evaluate_vgl_impl(spline, r[0], r[1], r[2], psi.data() + first, grad.data() + first, lap.data() + first, psi.size(),
                     first, last);
@@ -67,27 +67,27 @@ __forceinline void evaluate3d_vgl(const SPLINET& spline, const PT& r, VT& psi, G
 
 /// evaluate values, gradients, hessians optionally in the range [first,last)
 template<typename SPLINET, typename PT, typename VT, typename GT, typename HT>
-__forceinline void evaluate3d_vgh(const SPLINET& spline, const PT& r, VT& psi, GT& grad, HT& hess)
+inline void evaluate3d_vgh(const SPLINET& spline, const PT& r, VT& psi, GT& grad, HT& hess)
 {
   evaluate_vgh_impl(spline, r[0], r[1], r[2], psi.data(), grad.data(), hess.data(), psi.size(), 0, psi.size());
 }
 
 template<typename SPLINET, typename PT, typename VT, typename GT, typename HT>
-__forceinline void evaluate3d_vgh(const SPLINET& spline, const PT& r, VT& psi, GT& grad, HT& hess, int first, int last)
+inline void evaluate3d_vgh(const SPLINET& spline, const PT& r, VT& psi, GT& grad, HT& hess, int first, int last)
 {
   evaluate_vgh_impl(spline, r[0], r[1], r[2], psi.data() + first, grad.data() + first, hess.data() + first, psi.size(),
                     first, last);
 }
 
 template<typename SPLINET, typename PT, typename VT, typename GT, typename HT, typename GHT>
-__forceinline void evaluate3d_vghgh(const SPLINET& spline, const PT& r, VT& psi, GT& grad, HT& hess, GHT& ghess)
+inline void evaluate3d_vghgh(const SPLINET& spline, const PT& r, VT& psi, GT& grad, HT& hess, GHT& ghess)
 {
   evaluate_vghgh_impl(spline, r[0], r[1], r[2], psi.data(), grad.data(), hess.data(), ghess.data(), psi.size(), 0,
                       psi.size());
 }
 
 template<typename SPLINET, typename PT, typename VT, typename GT, typename HT, typename GHT>
-__forceinline void evaluate3d_vghgh(const SPLINET& spline,
+inline void evaluate3d_vghgh(const SPLINET& spline,
                                     const PT& r,
                                     VT& psi,
                                     GT& grad,