Merge branch release-5-1

Change-Id: Iefe28408022b6964e7b1cbab07032f5d110c5f6b

diff --cc cmake/gmxManageGPU.cmake
Simple merge

diff --cc cmake/gmxManageSimd.cmake
index 66fe788f5f1b084fcb4aa2ccf8a1287ad38fae0d,255ea7fc077b3b15e1c7957d2b0266f945a514d2..959ac77fc0c09834a64b29506b63ec4abec42e16
--- 1/cmake/gmxManageSimd.cmake
--- 2/cmake/gmxManageSimd.cmake
+++ b/cmake/gmxManageSimd.cmake
@@@ -337,10 -351,10 +351,10 @@@ elseif(GMX_SIMD STREQUAL "ARM_NEON"
                                  "#include<arm_neon.h>
                                  int main(){float32x4_t x=vdupq_n_f32(0.5);x=vmlaq_f32(x,x,x);return vgetq_lane_f32(x,0)>0;}"
                                  SIMD_CXX_FLAGS
 -                                "-mfpu=neon" "-D__STDC_CONSTANT_MACROS" "")
 +                                "-mfpu=neon-vfpv4" "-mfpu=neon" "-D__STDC_CONSTANT_MACROS" "")
  
      if(NOT CFLAGS_ARM_NEON OR NOT CXXFLAGS_ARM_NEON)
-         message(FATAL_ERROR "Cannot find ARM NEON compiler flag. Use a newer compiler, or disable NEON SIMD.")
 -        gmx_give_fatal_error_when_simd_support_not_found("ARM 32-bit NEON" "disable SIMD support (slower)" "${SUGGEST_BINUTILS_UPDATE}")
++        gmx_give_fatal_error_when_simd_support_not_found("ARM NEON" "disable SIMD support (slower)" "${SUGGEST_BINUTILS_UPDATE}")
      endif()
  
      set(GMX_SIMD_ARM_NEON 1)
@@@ -355,12 -371,16 +369,12 @@@ elseif(GMX_SIMD STREQUAL "ARM_NEON_ASIM
                                "")
      gmx_find_cxxflag_for_source(CXXFLAGS_ARM_NEON_ASIMD "C++ compiler ARM NEON Advanced SIMD flag"
                                  "#include<arm_neon.h>
 -                                int main(){float64x2_t x=vdupq_n_f64(0.5);x=vfmaq_f64(x,x,x);return vgetq_lane_f64(x,0)>0;}"
 +                                int main(){float64x2_t x=vdupq_n_f64(0.5);x=vfmaq_f64(x,x,x);x=vrndnq_f64(x);return vgetq_lane_f64(x,0)>0;}"
                                  SIMD_CXX_FLAGS
 -                                "-D__STDC_CONSTANT_MACROS" "")
 +                                "")
  
      if(NOT CFLAGS_ARM_NEON_ASIMD OR NOT CXXFLAGS_ARM_NEON_ASIMD)
-         message(FATAL_ERROR "Compiler does not fully support ARM (AArch64) NEON Advanced SIMD. Use a newer compiler (gcc version 4.9 or later), or disable SIMD.")
 -        gmx_give_fatal_error_when_simd_support_not_found("ARM (AArch64) NEON Advanced SIMD" "disable SIMD support (slower)" "${SUGGEST_BINUTILS_UPDATE}")
 -    endif()
 -
 -    if(CMAKE_C_COMPILER_ID MATCHES "GNU" AND CMAKE_C_COMPILER_VERSION VERSION_LESS "4.9")
 -        message(WARNING "At least gcc-4.8.1 has many bugs for ARM (AArch64) NEON Advanced SIMD compilation. You might need gcc version 4.9 or later.")
++        gmx_give_fatal_error_when_simd_support_not_found("ARM (AArch64) NEON Advanced SIMD" "particularly gcc version 4.9 or later, or disable SIMD support (slower)" "${SUGGEST_BINUTILS_UPDATE}")
      endif()
  
      if(CMAKE_C_COMPILER_ID MATCHES "Clang" AND CMAKE_C_COMPILER_VERSION VERSION_LESS "3.4")

diff --cc docs/install-guide/index.rst
Simple merge