Add new NAG 6.2 bug test case

Author: nncarlson

nag-bugs/CMakeLists.txt

@@ -5,6 +5,7 @@ include(testing)
 
 project(nag-bug Fortran)
 
+add_compiler_test(SOURCES nag-20200110.f90 RUN_ONLY COMPILE_FLAGS "-O")
 add_compiler_test(SOURCES nag-20190906.f90 RUN_ONLY LABELS SR104066)
 add_compiler_test(SOURCES nag-20190831.f90 RUN_ONLY LABELS SR104066)
 add_compiler_test(SOURCES nag-20190826a.f90 COMPILE_ONLY LABELS SR104042)

nag-bugs/nag-20200110.f90

@@ -0,0 +1,23 @@
+!! WRONG CODE UNDER OPTIMIZATION
+!!
+!! The 6.2 compiler generates wrong code for the following example
+!! when compiled with -O. The array ARR2 should ultimately have the
+!! same size as ARR1, but instead has size 0.
+!!
+!! Credit to David Neill-Asanza (dhna@lanl.gov) for this reproducer.
+!!
+!! $ nagfor -O nag-20200110.f90 
+!! NAG Fortran Compiler Release 6.2(Chiyoda) Build 6243
+!! 
+!! $ ./a.out
+!! STOP: 1
+
+integer :: i, arr1(32)
+integer, allocatable :: arr2(:)
+arr1 = [(i, i=1,size(arr1))]
+arr2 = arr1
+arr2 = arr2 * 2
+if (size(arr2) /= size(arr1)) stop 1
+if (any(arr2 /= 2*arr1)) stop 2
+end
+