c3-lang/libffi

diff --git a/acinclude.m4 b/acinclude.m4
index 2f11412..9ef93a8 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -45,16 +45,16 @@ else
 
    # Unlike /dev/zero, the MAP_ANON(YMOUS) defines can be probed for.
    AC_CACHE_CHECK([for MAP_ANON(YMOUS)], ac_cv_decl_map_anon,
-    [AC_TRY_COMPILE(
-[#include <sys/types.h>
+    [AC_COMPILE_IFELSE(
+[AC_LANG_PROGRAM([[#include <sys/types.h>
 #include <sys/mman.h>
 #include <unistd.h>
 
 #ifndef MAP_ANONYMOUS
 #define MAP_ANONYMOUS MAP_ANON
 #endif
-],
-[int n = MAP_ANONYMOUS;],
+]],
+[[int n = MAP_ANONYMOUS;]])],
     ac_cv_decl_map_anon=yes,
     ac_cv_decl_map_anon=no)])
 
@@ -104,7 +104,7 @@ dnl See docs/html/17_intro/configury.html#enable for documentation.
 dnl
 m4_define([LIBFFI_ENABLE],[dnl
 m4_define([_g_switch],[--enable-$1])dnl
-m4_define([_g_help],[AC_HELP_STRING(_g_switch$3,[$4 @<:@default=$2@:>@])])dnl
+m4_define([_g_help],[AS_HELP_STRING([_g_switch$3],[$4 @<:@default=$2@:>@])])dnl
  AC_ARG_ENABLE($1,_g_help,
   m4_bmatch([$5],
    [^permit ],
@@ -152,7 +152,7 @@ AC_DEFUN([LIBFFI_CHECK_LINKER_FEATURES], [
   # by now (in libtool), but require it now just to be safe...
   test -z "$SECTION_LDFLAGS" && SECTION_LDFLAGS=''
   test -z "$OPT_LDFLAGS" && OPT_LDFLAGS=''
-  AC_REQUIRE([AC_PROG_LD])
+  AC_REQUIRE([LT_PATH_LD])
   AC_REQUIRE([AC_PROG_AWK])
 
   # The name set by libtool depends on the version of libtool.  Shame on us
@@ -205,14 +205,14 @@ AC_DEFUN([LIBFFI_CHECK_LINKER_FEATURES], [
     # .eh_frame and now some of the glibc sections for iconv).
     # Bzzzzt.  Thanks for playing, maybe next time.
     AC_MSG_CHECKING([for ld that supports -Wl,--gc-sections])
-    AC_TRY_RUN([
+    AC_RUN_IFELSE([AC_LANG_SOURCE([[
      int main(void)
      {
        try { throw 1; }
        catch (...) { };
        return 0;
      }
-    ], [ac_sectionLDflags=yes],[ac_sectionLDflags=no], [ac_sectionLDflags=yes])
+    ]])],[ac_sectionLDflags=yes],[ac_sectionLDflags=no],[ac_sectionLDflags=yes])
     if test "$ac_test_CFLAGS" = set; then
       CFLAGS="$ac_save_CFLAGS"
     else
@@ -299,7 +299,7 @@ if test $enable_symvers != no; then
   AC_MSG_CHECKING([for shared libgcc])
   ac_save_CFLAGS="$CFLAGS"
   CFLAGS=' -lgcc_s'
-  AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes, libat_shared_libgcc=no)
+  AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[return 0;]])],[libat_shared_libgcc=yes],[libat_shared_libgcc=no])
   CFLAGS="$ac_save_CFLAGS"
   if test $libat_shared_libgcc = no; then
     cat > conftest.c <<EOF
@@ -314,7 +314,7 @@ changequote([,])dnl
     rm -f conftest.c conftest.so
     if test x${libat_libgcc_s_suffix+set} = xset; then
       CFLAGS=" -lgcc_s$libat_libgcc_s_suffix"
-      AC_TRY_LINK(, [return 0;], libat_shared_libgcc=yes)
+      AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[return 0;]])],[libat_shared_libgcc=yes],[])
       CFLAGS="$ac_save_CFLAGS"
     fi
   fi
diff --git a/configure.ac b/configure.ac
index 8feb248..4629d2d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,11 +1,11 @@
 dnl Process this with autoconf to create configure
 
-AC_PREREQ(2.68)
+AC_PREREQ([2.71])
 
-AC_INIT([libffi], [3.4.2], [http://github.com/libffi/libffi/issues])
+AC_INIT([libffi],[3.4.2],[http://github.com/libffi/libffi/issues])
 AC_CONFIG_HEADERS([fficonfig.h])
 
-AC_CANONICAL_SYSTEM
+AC_CANONICAL_TARGET
 target_alias=${target_alias-$host_alias}
 
 case "${host}" in
@@ -39,7 +39,7 @@ AC_SUBST(CFLAGS)
 AM_PROG_AS
 AM_PROG_CC_C_O
 AC_PROG_EGREP
-AC_PROG_LIBTOOL
+LT_INIT
 AC_CONFIG_MACRO_DIR([m4])
 
 AC_CHECK_TOOL(READELF, readelf)
@@ -89,7 +89,15 @@ fi
 AC_SUBST(AM_RUNTESTFLAGS)
 AC_SUBST(AM_LTLDFLAGS)
 
-AC_HEADER_STDC
+m4_warn([obsolete],
+[The preprocessor macro `STDC_HEADERS' is obsolete.
+  Except in unusual embedded environments, you can safely include all
+  ISO C90 headers unconditionally.])dnl
+# Autoupdate added the next two lines to ensure that your configure
+# script's behavior did not change.  They are probably safe to remove.
+AC_CHECK_INCLUDES_DEFAULT
+AC_PROG_EGREP
+
 AC_CHECK_FUNCS(memcpy)
 AC_FUNC_ALLOCA
 
@@ -126,9 +134,7 @@ case "$TARGET" in
 	save_LDFLAGS="$LDFLAGS"
 	CFLAGS="$CFLAGS -fpic"
 	LDFLAGS="$LDFLAGS -shared"
-	AC_TRY_LINK([asm (".text; foo: nop; .data; .align 4; .byte 0; .uaword %r_disp32(foo); .text");],,
-		    [libffi_cv_as_sparc_ua_pcrel=yes],
-		    [libffi_cv_as_sparc_ua_pcrel=no])
+	AC_LINK_IFELSE([AC_LANG_PROGRAM([[asm (".text; foo: nop; .data; .align 4; .byte 0; .uaword %r_disp32(foo); .text");]], [[]])],[libffi_cv_as_sparc_ua_pcrel=yes],[libffi_cv_as_sparc_ua_pcrel=no])
 	CFLAGS="$save_CFLAGS"
 	LDFLAGS="$save_LDFLAGS"])
     if test "x$libffi_cv_as_sparc_ua_pcrel" = xyes; then
@@ -140,9 +146,7 @@ case "$TARGET" in
        libffi_cv_as_register_pseudo_op, [
        libffi_cv_as_register_pseudo_op=unknown
        # Check if we have .register
-       AC_TRY_COMPILE(,[asm (".register %g2, #scratch");],
-		       [libffi_cv_as_register_pseudo_op=yes],
-		       [libffi_cv_as_register_pseudo_op=no])
+       AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[asm (".register %g2, #scratch");]])],[libffi_cv_as_register_pseudo_op=yes],[libffi_cv_as_register_pseudo_op=no])
     ])
     if test "x$libffi_cv_as_register_pseudo_op" = xyes; then
        AC_DEFINE(HAVE_AS_REGISTER_PSEUDO_OP, 1,
@@ -186,7 +190,7 @@ esac
 AC_CACHE_CHECK([whether compiler supports pointer authentication],
    libffi_cv_as_ptrauth, [
    libffi_cv_as_ptrauth=unknown
-   AC_TRY_COMPILE(,[
+   AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
 #ifdef __clang__
 # if __has_feature(ptrauth_calls)
 #  define HAVE_PTRAUTH 1
@@ -196,9 +200,7 @@ AC_CACHE_CHECK([whether compiler supports pointer authentication],
 #ifndef HAVE_PTRAUTH
 # error Pointer authentication not supported
 #endif
-		   ],
-		   [libffi_cv_as_ptrauth=yes],
-		   [libffi_cv_as_ptrauth=no])
+		   ]])],[libffi_cv_as_ptrauth=yes],[libffi_cv_as_ptrauth=no])
 ])
 if test "x$libffi_cv_as_ptrauth" = xyes; then
     AC_DEFINE(HAVE_PTRAUTH, 1,
@@ -308,8 +310,7 @@ if test "x$GCC" = "xyes"; then
 fi
 
 AC_ARG_ENABLE(docs,
-              AC_HELP_STRING([--disable-docs],
-                             [Disable building of docs (default: no)]),
+              AS_HELP_STRING([--disable-docs],[Disable building of docs (default: no)]),
               [enable_docs=no],
               [enable_docs=yes])
 AM_CONDITIONAL(BUILD_DOCS, [test x$enable_docs = xyes])
diff --git a/m4/asmcfi.m4 b/m4/asmcfi.m4
index 3e28602..21bd952 100644
--- a/m4/asmcfi.m4
+++ b/m4/asmcfi.m4
@@ -2,7 +2,7 @@ AC_DEFUN([GCC_AS_CFI_PSEUDO_OP],
 [AC_CACHE_CHECK([assembler .cfi pseudo-op support],
     gcc_cv_as_cfi_pseudo_op, [
     gcc_cv_as_cfi_pseudo_op=unknown
-    AC_TRY_COMPILE([asm (".cfi_sections\n\t.cfi_startproc\n\t.cfi_endproc");],,
+    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[asm (".cfi_sections\n\t.cfi_startproc\n\t.cfi_endproc");]])],
 		   [gcc_cv_as_cfi_pseudo_op=yes],
 		   [gcc_cv_as_cfi_pseudo_op=no])
  ])
diff --git a/m4/ax_cc_maxopt.m4 b/m4/ax_cc_maxopt.m4
index 027b6d8..58e267b 100644
--- a/m4/ax_cc_maxopt.m4
+++ b/m4/ax_cc_maxopt.m4
@@ -55,7 +55,7 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 18
+#serial 22
 
 AC_DEFUN([AX_CC_MAXOPT],
 [
@@ -67,7 +67,7 @@ AC_ARG_ENABLE(portable-binary, [AS_HELP_STRING([--enable-portable-binary], [disa
 	acx_maxopt_portable=$enableval, acx_maxopt_portable=no)
 
 # Try to determine "good" native compiler flags if none specified via CFLAGS
-if test "$ac_test_CFLAGS" != "set"; then
+if test "x$ac_test_CFLAGS" = "x"; then
   case $ax_cv_c_compiler_vendor in
     dec) CFLAGS="$CFLAGS -newc -w0 -O5 -ansi_alias -ansi_args -fp_reorder -tune host"
 	 if test "x$acx_maxopt_portable" = xno; then
@@ -143,13 +143,17 @@ if test "$ac_test_CFLAGS" != "set"; then
         fi
 	;;
 
+    nvhpc)
+     # default optimization flags for nvhpc
+     CFLAGS="$CFLAGS -O3"
+     ;;
+
     gnu)
      # default optimization flags for gcc on all systems
      CFLAGS="$CFLAGS -O3 -fomit-frame-pointer"
 
      # -malign-double for x86 systems
-     # libffi local change -- don't align double, as it changes the ABI
-     # AX_CHECK_COMPILE_FLAG(-malign-double, CFLAGS="$CFLAGS -malign-double")
+     AX_CHECK_COMPILE_FLAG(-malign-double, CFLAGS="$CFLAGS -malign-double")
 
      #  -fstrict-aliasing for gcc-2.95+
      AX_CHECK_COMPILE_FLAG(-fstrict-aliasing,
diff --git a/m4/ax_cflags_warn_all.m4 b/m4/ax_cflags_warn_all.m4
index 094577e..9235a18 100644
--- a/m4/ax_cflags_warn_all.m4
+++ b/m4/ax_cflags_warn_all.m4
@@ -4,33 +4,54 @@
 #
 # SYNOPSIS
 #
-#   AX_CFLAGS_WARN_ALL   [(shellvar [,default, [A/NA]])]
-#   AX_CXXFLAGS_WARN_ALL [(shellvar [,default, [A/NA]])]
-#   AX_FCFLAGS_WARN_ALL  [(shellvar [,default, [A/NA]])]
+#   AX_CFLAGS_WARN_ALL   [(shellvar[, default[, action-if-found[, action-if-not-found]]])]
+#   AX_CXXFLAGS_WARN_ALL [(shellvar[, default[, action-if-found[, action-if-not-found]]])]
+#   AX_FCFLAGS_WARN_ALL  [(shellvar[, default[, action-if-found[, action-if-not-found]]])]
 #
 # DESCRIPTION
 #
-#   Try to find a compiler option that enables most reasonable warnings.
+#   Specify compiler options that enable most reasonable warnings.  For the
+#   GNU Compiler Collection (GCC), for example, it will be "-Wall".  The
+#   result is added to shellvar, one of CFLAGS, CXXFLAGS or FCFLAGS if the
+#   first parameter is not specified.
 #
-#   For the GNU compiler it will be -Wall (and -ansi -pedantic) The result
-#   is added to the shellvar being CFLAGS, CXXFLAGS, or FCFLAGS by default.
+#   Each of these macros accepts the following optional arguments:
 #
-#   Currently this macro knows about the GCC, Solaris, Digital Unix, AIX,
-#   HP-UX, IRIX, NEC SX-5 (Super-UX 10), Cray J90 (Unicos 10.0.0.8), and
-#   Intel compilers.  For a given compiler, the Fortran flags are much more
-#   experimental than their C equivalents.
+#     - $1 - shellvar
+#         shell variable to use (CFLAGS, CXXFLAGS or FCFLAGS if not
+#         specified, depending on macro)
 #
-#    - $1 shell-variable-to-add-to : CFLAGS, CXXFLAGS, or FCFLAGS
-#    - $2 add-value-if-not-found : nothing
-#    - $3 action-if-found : add value to shellvariable
-#    - $4 action-if-not-found : nothing
+#     - $2 - default
+#         value to use for flags if compiler vendor cannot be determined (by
+#         default, "")
 #
-#   NOTE: These macros depend on AX_APPEND_FLAG.
+#     - $3 - action-if-found
+#         action to take if the compiler vendor has been successfully
+#         determined (by default, add the appropriate compiler flags to
+#         shellvar)
+#
+#     - $4 - action-if-not-found
+#         action to take if the compiler vendor has not been determined or
+#         is unknown (by default, add the default flags, or "" if not
+#         specified, to shellvar)
+#
+#   These macros use AX_COMPILER_VENDOR to determine which flags should be
+#   returned for a given compiler.  Not all compilers currently have flags
+#   defined for them; patches are welcome.  If need be, compiler flags may
+#   be made language-dependent: use a construct like the following:
+#
+#     [vendor_name], [m4_if(_AC_LANG_PREFIX,[C],   VAR="--relevant-c-flags",dnl
+#                     m4_if(_AC_LANG_PREFIX,[CXX], VAR="--relevant-c++-flags",dnl
+#                     m4_if(_AC_LANG_PREFIX,[FC],  VAR="--relevant-fortran-flags",dnl
+#                     VAR="$2"; FOUND="no")))],
+#
+#   Note: These macros also depend on AX_PREPEND_FLAG.
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2010 Rhys Ulerich <rhys.ulerich@gmail.com>
+#   Copyright (c) 2018 John Zaitseff <J.Zaitseff@zap.org.au>
 #
 #   This program is free software; you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
@@ -58,65 +79,80 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 16
+#serial 25
+
+AC_DEFUN([AX_FLAGS_WARN_ALL], [
+    AX_REQUIRE_DEFINED([AX_PREPEND_FLAG])dnl
+    AC_REQUIRE([AX_COMPILER_VENDOR])dnl
+
+    AS_VAR_PUSHDEF([FLAGS], [m4_default($1,_AC_LANG_PREFIX[]FLAGS)])dnl
+    AS_VAR_PUSHDEF([VAR],   [ac_cv_[]_AC_LANG_ABBREV[]flags_warn_all])dnl
+    AS_VAR_PUSHDEF([FOUND], [ac_save_[]_AC_LANG_ABBREV[]flags_warn_all_found])dnl
+
+    AC_CACHE_CHECK([FLAGS for most reasonable warnings], VAR, [
+	VAR=""
+	FOUND="yes"
+	dnl  Cases are listed in the order found in ax_compiler_vendor.m4
+	AS_CASE("$ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor",
+	    [intel],		[VAR="-w2"],
+	    [ibm],		[VAR="-qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd"],
+	    [pathscale],	[],
+	    [clang],		[VAR="-Wall"],
+	    [cray],		[VAR="-h msglevel 2"],
+	    [fujitsu],		[],
+	    [sdcc],		[],
+	    [sx],		[VAR="-pvctl[,]fullmsg"],
+	    [portland],		[],
+	    [gnu],		[VAR="-Wall"],
+	    [sun],		[VAR="-v"],
+	    [hp],		[VAR="+w1"],
+	    [dec],		[VAR="-verbose -w0 -warnprotos"],
+	    [borland],		[],
+	    [comeau],		[],
+	    [kai],		[],
+	    [lcc],		[],
+	    [sgi],		[VAR="-fullwarn"],
+	    [microsoft],	[],
+	    [metrowerks],	[],
+	    [watcom],		[],
+	    [tcc],		[],
+	    [unknown],		[
+				    VAR="$2"
+				    FOUND="no"
+				],
+				[
+				    AC_MSG_WARN([Unknown compiler vendor returned by [AX_COMPILER_VENDOR]])
+				    VAR="$2"
+				    FOUND="no"
+				]
+	)
+
+	AS_IF([test "x$FOUND" = "xyes"], [dnl
+	    m4_default($3, [AS_IF([test "x$VAR" != "x"], [AX_PREPEND_FLAG([$VAR], [FLAGS])])])
+	], [dnl
+	    m4_default($4, [m4_ifval($2, [AX_PREPEND_FLAG([$VAR], [FLAGS])], [true])])
+	])dnl
+    ])dnl
 
-AC_DEFUN([AX_FLAGS_WARN_ALL],[dnl
-AS_VAR_PUSHDEF([FLAGS],[_AC_LANG_PREFIX[]FLAGS])dnl
-AS_VAR_PUSHDEF([VAR],[ac_cv_[]_AC_LANG_ABBREV[]flags_warn_all])dnl
-AC_CACHE_CHECK([m4_ifval($1,$1,FLAGS) for maximum warnings],
-VAR,[VAR="no, unknown"
-ac_save_[]FLAGS="$[]FLAGS"
-for ac_arg dnl
-in "-warn all  % -warn all"   dnl Intel
-   "-pedantic  % -Wall"       dnl GCC
-   "-xstrconst % -v"          dnl Solaris C
-   "-std1      % -verbose -w0 -warnprotos" dnl Digital Unix
-   "-qlanglvl=ansi % -qsrcmsg -qinfo=all:noppt:noppc:noobs:nocnd" dnl AIX
-   "-ansi -ansiE % -fullwarn" dnl IRIX
-   "+ESlit     % +w1"         dnl HP-UX C
-   "-Xc        % -pvctl[,]fullmsg" dnl NEC SX-5 (Super-UX 10)
-   "-h conform % -h msglevel 2" dnl Cray C (Unicos)
-   #
-do FLAGS="$ac_save_[]FLAGS "`echo $ac_arg | sed -e 's,%%.*,,' -e 's,%,,'`
-   AC_COMPILE_IFELSE([AC_LANG_PROGRAM],
-                     [VAR=`echo $ac_arg | sed -e 's,.*% *,,'` ; break])
-done
-FLAGS="$ac_save_[]FLAGS"
-])
-AS_VAR_POPDEF([FLAGS])dnl
-AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
-case ".$VAR" in
-     .ok|.ok,*) m4_ifvaln($3,$3) ;;
-   .|.no|.no,*) m4_default($4,[m4_ifval($2,[AX_APPEND_FLAG([$2], [$1])])]) ;;
-   *) m4_default($3,[AX_APPEND_FLAG([$VAR], [$1])]) ;;
-esac
-AS_VAR_POPDEF([VAR])dnl
+    AS_VAR_POPDEF([FOUND])dnl
+    AS_VAR_POPDEF([VAR])dnl
+    AS_VAR_POPDEF([FLAGS])dnl
 ])dnl AX_FLAGS_WARN_ALL
-dnl  implementation tactics:
-dnl   the for-argument contains a list of options. The first part of
-dnl   these does only exist to detect the compiler - usually it is
-dnl   a global option to enable -ansi or -extrawarnings. All other
-dnl   compilers will fail about it. That was needed since a lot of
-dnl   compilers will give false positives for some option-syntax
-dnl   like -Woption or -Xoption as they think of it is a pass-through
-dnl   to later compile stages or something. The "%" is used as a
-dnl   delimiter. A non-option comment can be given after "%%" marks
-dnl   which will be shown but not added to the respective C/CXXFLAGS.
 
-AC_DEFUN([AX_CFLAGS_WARN_ALL],[dnl
-AC_LANG_PUSH([C])
-AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
-AC_LANG_POP([C])
-])
+AC_DEFUN([AX_CFLAGS_WARN_ALL], [dnl
+    AC_LANG_PUSH([C])
+    AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
+    AC_LANG_POP([C])
+])dnl
 
-AC_DEFUN([AX_CXXFLAGS_WARN_ALL],[dnl
-AC_LANG_PUSH([C++])
-AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
-AC_LANG_POP([C++])
-])
+AC_DEFUN([AX_CXXFLAGS_WARN_ALL], [dnl
+    AC_LANG_PUSH([C++])
+    AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
+    AC_LANG_POP([C++])
+])dnl
 
-AC_DEFUN([AX_FCFLAGS_WARN_ALL],[dnl
-AC_LANG_PUSH([Fortran])
-AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
-AC_LANG_POP([Fortran])
-])
+AC_DEFUN([AX_FCFLAGS_WARN_ALL], [dnl
+    AC_LANG_PUSH([Fortran])
+    AX_FLAGS_WARN_ALL([$1], [$2], [$3], [$4])
+    AC_LANG_POP([Fortran])
+])dnl
diff --git a/m4/ax_compiler_vendor.m4 b/m4/ax_compiler_vendor.m4
index 73efdb0..039f99d 100644
--- a/m4/ax_compiler_vendor.m4
+++ b/m4/ax_compiler_vendor.m4
@@ -8,15 +8,30 @@
 #
 # DESCRIPTION
 #
-#   Determine the vendor of the C/C++ compiler, e.g., gnu, intel, ibm, sun,
-#   hp, borland, comeau, dec, cray, kai, lcc, metrowerks, sgi, microsoft,
-#   watcom, etc. The vendor is returned in the cache variable
-#   $ax_cv_c_compiler_vendor for C and $ax_cv_cxx_compiler_vendor for C++.
+#   Determine the vendor of the C, C++ or Fortran compiler.  The vendor is
+#   returned in the cache variable $ax_cv_c_compiler_vendor for C,
+#   $ax_cv_cxx_compiler_vendor for C++ or $ax_cv_fc_compiler_vendor for
+#   (modern) Fortran.  The value is one of "intel", "ibm", "pathscale",
+#   "clang" (LLVM), "cray", "fujitsu", "sdcc", "sx", "nvhpc" (NVIDIA HPC
+#   Compiler), "portland" (PGI), "gnu" (GCC), "sun" (Oracle Developer
+#   Studio), "hp", "dec", "borland", "comeau", "kai", "lcc", "sgi",
+#   "microsoft", "metrowerks", "watcom", "tcc" (Tiny CC) or "unknown" (if
+#   the compiler cannot be determined).
+#
+#   To check for a Fortran compiler, you must first call AC_FC_PP_SRCEXT
+#   with an appropriate preprocessor-enabled extension.  For example:
+#
+#     AC_LANG_PUSH([Fortran])
+#     AC_PROG_FC
+#     AC_FC_PP_SRCEXT([F])
+#     AX_COMPILER_VENDOR
+#     AC_LANG_POP([Fortran])
 #
 # LICENSE
 #
 #   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
 #   Copyright (c) 2008 Matteo Frigo
+#   Copyright (c) 2018-19 John Zaitseff <J.Zaitseff@zap.org.au>
 #
 #   This program is free software: you can redistribute it and/or modify it
 #   under the terms of the GNU General Public License as published by the
@@ -44,45 +59,61 @@
 #   modified version of the Autoconf Macro, you may extend this special
 #   exception to the GPL to apply to your modified version as well.
 
-#serial 17
+#serial 32
+
+AC_DEFUN([AX_COMPILER_VENDOR], [dnl
+    AC_CACHE_CHECK([for _AC_LANG compiler vendor], ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor, [dnl
+	dnl  If you modify this list of vendors, please add similar support
+	dnl  to ax_compiler_version.m4 if at all possible.
+	dnl
+	dnl  Note: Do NOT check for GCC first since some other compilers
+	dnl  define __GNUC__ to remain compatible with it.  Compilers that
+	dnl  are very slow to start (such as Intel) are listed first.
+
+	vendors="
+		intel:		__ICC,__ECC,__INTEL_COMPILER
+		ibm:		__xlc__,__xlC__,__IBMC__,__IBMCPP__,__ibmxl__
+		pathscale:	__PATHCC__,__PATHSCALE__
+		clang:		__clang__
+		cray:		_CRAYC
+		fujitsu:	__FUJITSU
+		sdcc:		SDCC,__SDCC
+		sx:		_SX
+		nvhpc:		__NVCOMPILER
+		portland:	__PGI
+		gnu:		__GNUC__
+		sun:		__SUNPRO_C,__SUNPRO_CC,__SUNPRO_F90,__SUNPRO_F95
+		hp:		__HP_cc,__HP_aCC
+		dec:		__DECC,__DECCXX,__DECC_VER,__DECCXX_VER
+		borland:	__BORLANDC__,__CODEGEARC__,__TURBOC__
+		comeau:		__COMO__
+		kai:		__KCC
+		lcc:		__LCC__
+		sgi:		__sgi,sgi
+		microsoft:	_MSC_VER
+		metrowerks:	__MWERKS__
+		watcom:		__WATCOMC__
+		tcc:		__TINYC__
+		unknown:	UNKNOWN
+	"
+	for ventest in $vendors; do
+	    case $ventest in
+		*:)
+		    vendor=$ventest
+		    continue
+		    ;;
+		*)
+		    vencpp="defined("`echo $ventest | sed 's/,/) || defined(/g'`")"
+		    ;;
+	    esac
+
+	    AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[
+#if !($vencpp)
+      thisisanerror;
+#endif
+	    ]])], [break])
+	done
 
-AC_DEFUN([AX_COMPILER_VENDOR],
-[AC_CACHE_CHECK([for _AC_LANG compiler vendor], ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor,
-  dnl Please add if possible support to ax_compiler_version.m4
-  [# note: don't check for gcc first since some other compilers define __GNUC__
-  vendors="intel:     __ICC,__ECC,__INTEL_COMPILER
-           ibm:       __xlc__,__xlC__,__IBMC__,__IBMCPP__
-           pathscale: __PATHCC__,__PATHSCALE__
-           clang:     __clang__
-           cray:      _CRAYC
-           fujitsu:   __FUJITSU
-           sdcc:      SDCC, __SDCC
-           gnu:       __GNUC__
-           sun:       __SUNPRO_C,__SUNPRO_CC
-           hp:        __HP_cc,__HP_aCC
-           dec:       __DECC,__DECCXX,__DECC_VER,__DECCXX_VER
-           borland:   __BORLANDC__,__CODEGEARC__,__TURBOC__
-           comeau:    __COMO__
-           kai:       __KCC
-           lcc:       __LCC__
-           sgi:       __sgi,sgi
-           microsoft: _MSC_VER
-           metrowerks: __MWERKS__
-           watcom:    __WATCOMC__
-           portland:  __PGI
-	   tcc:       __TINYC__
-           unknown:   UNKNOWN"
-  for ventest in $vendors; do
-    case $ventest in
-      *:) vendor=$ventest; continue ;;
-      *)  vencpp="defined("`echo $ventest | sed 's/,/) || defined(/g'`")" ;;
-    esac
-    AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[
-      #if !($vencpp)
-        thisisanerror;
-      #endif
-    ])], [break])
-  done
-  ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor=`echo $vendor | cut -d: -f1`
- ])
-])
+	ax_cv_[]_AC_LANG_ABBREV[]_compiler_vendor=`echo $vendor | cut -d: -f1`
+    ])
+])dnl