Fix pgcc18 support.

- pgcc18 defines __GNUC__ similar to Intel compilers. So we must
  check for pgi higher up, or else configury will mistake
  it for gcc.

Signed-off-by: Austen Lauria <[email protected]>

Author: awlauria

config/opal_check_vendor.m4

@@ -102,14 +102,20 @@ AC_DEFUN([_OPAL_CHECK_COMPILER_VENDOR], [
     opal_check_compiler_vendor_result="unknown"
 
     # GNU is probably the most common, so check that one as soon as
-    # possible.  Intel pretends to be GNU, so need to check Intel
-    # before checking for GNU.
+    # possible.  Intel and PGI18 pretends to be GNU, so need to check Intel
+    # and PGI before checking for GNU.
 
     # Intel
     AS_IF([test "$opal_check_compiler_vendor_result" = "unknown"],
           [OPAL_IF_IFELSE([defined(__INTEL_COMPILER) || defined(__ICC)],
                [opal_check_compiler_vendor_result="intel"])])
 
+    # Portland Group
+    AS_IF([test "$opal_check_compiler_vendor_result" = "unknown"],
+          [OPAL_IFDEF_IFELSE([__PGI],
+               [opal_check_compiler_vendor_result="portland group"])])
+
+
     # Fujitsu
     AS_IF([test "$opal_check_compiler_vendor_result" = "unknown"],
           [OPAL_IF_IFELSE([defined(__FUJITSU)],
@@ -243,11 +249,6 @@ AC_DEFUN([_OPAL_CHECK_COMPILER_VENDOR], [
           [OPAL_IFDEF_IFELSE([__POCC__],
                [opal_check_compiler_vendor_result="pelles"])])
 
-    # Portland Group
-    AS_IF([test "$opal_check_compiler_vendor_result" = "unknown"],
-          [OPAL_IFDEF_IFELSE([__PGI],
-               [opal_check_compiler_vendor_result="portland group"])])
-
     # SAS/C
     AS_IF([test "$opal_check_compiler_vendor_result" = "unknown"],
           [OPAL_IF_IFELSE([defined(SASC) || defined(__SASC) || defined(__SASC__)],