[flang] Remove OS dependency in folding test

Original-commit: flang-compiler/f18@3728898ea9
Reviewed-on: https://github.com/flang-compiler/f18/pull/483
Tree-same-pre-rewrite: false

flang/test/evaluate/CMakeLists.txt

@@ -135,6 +135,15 @@ add_test(RESHAPE reshape-test)
 add_test(ISO-binding ISO-Fortran-binding-test)
 add_test(folding folding-test)
 
+set(TEST_LIBPGMATH "-pgmath=false")
+if (LIBPGMATH_DIR)
+  find_library(LIBPGMATH pgmath PATHS ${LIBPGMATH_DIR})
+  if(LIBPGMATH)
+  set(TEST_LIBPGMATH "-pgmath=true")
+  endif()
+endif()
+
 foreach(test ${FOLDING_TESTS})
-  add_test(NAME ${test} COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/test_folding.sh ${test})
+  add_test(NAME ${test} COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/test_folding.sh
+    ${test} ${TEST_LIBPGMATH})
 endforeach()

flang/test/evaluate/test_folding.sh

@@ -33,35 +33,16 @@
 #   - test_x is not folded (it is neither .true. nor .false.). This means the
 #     compiler could not fold the expression.
 
-# Return ldd or similar tool to use to check for libpgmath
-function get_ldd() {
-  case $(uname -s) in
-    Linux) echo 'ldd' ;;
-    Darwin) echo 'otool -L' ;;
-    *)
-      >&2 echo "Warning: cannot detect libpgmath on $(uname -s)"
-      echo 'true' ;;
-  esac
-}
-
 PATH=/usr/bin:/bin
 srcdir=$(dirname $0)
 F18CC=${F18:-../../tools/f18/f18}
 CMD="$F18CC -fdebug-dump-symbols -fparse-only"
 
-# Check if libpgmath has been linked
-lpgmath=$($(get_ldd) $F18CC | grep "pgmath")
-if [ -z "$lpgmath" ]; then
-  echo "Assuming no libpgmath support"
-else
-  CMD="$CMD -DTEST_LIBPGMATH"
-  echo "Assuming libpgmath support"
-fi
-
-if [[ $# != 1 ]]; then
-  echo "Usage: $0 <fortran-source>"
+if [[ $# < 1 ]]; then
+  echo "Usage: $0 <fortran-source> [-pgmath=<true/false>]"
   exit 1
 fi
+
 src=$srcdir/$1
 [[ ! -f $src ]] && echo "File not found: $src" && exit 1
 
@@ -70,6 +51,12 @@ rm -rf $temp
 mkdir $temp
 [[ $KEEP ]] || trap "rm -rf $temp" EXIT
 
+# Check if tests should assume folding is using libpgmath
+if [[ $# > 1 && "$2" = "-pgmath=true" ]]; then
+  CMD="$CMD -DTEST_LIBPGMATH"
+  echo "Assuming libpgmath support"
+fi
+
 src1=$temp/symbols.log
 src2=$temp/all_parameters.log
 src3=$temp/tested_parameters.log