Update macros from autoconf-archive.

configure

@@ -7551,10 +7551,10 @@ ac_link='$CC_FOR_BUILD -o conftest$ac_build_exeext $CFLAGS_FOR_BUILD $CPPFLAGS_F
 ac_compiler_gnu=$ac_cv_build_c_compiler_gnu
 
 
-was_set_ac_cv_c_compiler_gnu=${ac_cv_c_compiler_gnu+y}
+was_set_c_compiler_gnu=${ac_cv_c_compiler_gnu+y}
-if test ${was_set_ac_cv_c_compiler_gnu}
+if test ${was_set_c_compiler_gnu}
 then :
-  saved_ac_cv_c_compiler_gnu=$ac_cv_c_compiler_gnu
+  saved_c_compiler_gnu=$ac_cv_c_compiler_gnu
     { ac_cv_c_compiler_gnu=; unset ac_cv_c_compiler_gnu;}
 fi
 
@@ -8312,9 +8312,9 @@ ac_link='$CC_FOR_BUILD -o conftest$ac_build_exeext $CFLAGS_FOR_BUILD $CPPFLAGS_F
 ac_compiler_gnu=$ac_cv_build_c_compiler_gnu
 
 
-if test ${was_set_ac_cv_c_compiler_gnu}
+if test ${was_set_c_compiler_gnu}
 then :
-  ac_cv_c_compiler_gnu=saved_ac_cv_c_compiler_gnu
+  ac_cv_c_compiler_gnu=$saved_c_compiler_gnu
 fi
 
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
@@ -31437,7 +31437,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___static_libgcc" >&5
 printf "%s\n" "$ax_cv_check_cflags___static_libgcc" >&6; }
-if test x"$ax_cv_check_cflags___static_libgcc" = xyes
+if test "x$ax_cv_check_cflags___static_libgcc" = xyes
 then :
 
 if test ${LT_LDFLAGS+y}
@@ -31672,7 +31672,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fvisibility_hidden" >&5
 printf "%s\n" "$ax_cv_check_cflags___fvisibility_hidden" >&6; }
-if test x"$ax_cv_check_cflags___fvisibility_hidden" = xyes
+if test "x$ax_cv_check_cflags___fvisibility_hidden" = xyes
 then :
 
 	printf "%s\n" "#define HAVE_DSO_VISIBILITY 1" >>confdefs.h
@@ -31722,7 +31722,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___Bhidden_def" >&5
 printf "%s\n" "$ax_cv_check_cflags___Bhidden_def" >&6; }
-if test x"$ax_cv_check_cflags___Bhidden_def" = xyes
+if test "x$ax_cv_check_cflags___Bhidden_def" = xyes
 then :
 
 		# HP-UX cc may not allow __declspec(dllexport) to be
@@ -31809,7 +31809,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___xldscope_hidden" >&5
 printf "%s\n" "$ax_cv_check_cflags___xldscope_hidden" >&6; }
-if test x"$ax_cv_check_cflags___xldscope_hidden" = xyes
+if test "x$ax_cv_check_cflags___xldscope_hidden" = xyes
 then :
 
 		printf "%s\n" "#define HAVE_DSO_VISIBILITY 1" >>confdefs.h
@@ -32011,7 +32011,7 @@ fi
 eval ac_res=\$$as_CACHEVAR
 	       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
 printf "%s\n" "$ac_res" >&6; }
-if test x"`eval 'as_val=${'$as_CACHEVAR'};printf "%s\n" "$as_val"'`" = xyes
+if eval test \"x\$"$as_CACHEVAR"\" = x"yes"
 then :
 
 
@@ -32149,7 +32149,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fno_omit_frame_pointer" >&5
 printf "%s\n" "$ax_cv_check_cflags___fno_omit_frame_pointer" >&6; }
-if test x"$ax_cv_check_cflags___fno_omit_frame_pointer" = xyes
+if test "x$ax_cv_check_cflags___fno_omit_frame_pointer" = xyes
 then :
 
 
@@ -32250,7 +32250,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fsanitize_fuzzer_no_link" >&5
 printf "%s\n" "$ax_cv_check_cflags___fsanitize_fuzzer_no_link" >&6; }
-if test x"$ax_cv_check_cflags___fsanitize_fuzzer_no_link" = xyes
+if test "x$ax_cv_check_cflags___fsanitize_fuzzer_no_link" = xyes
 then :
 
 
@@ -32391,7 +32391,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fno_omit_frame_pointer" >&5
 printf "%s\n" "$ax_cv_check_cflags___fno_omit_frame_pointer" >&6; }
-if test x"$ax_cv_check_cflags___fno_omit_frame_pointer" = xyes
+if test "x$ax_cv_check_cflags___fno_omit_frame_pointer" = xyes
 then :
 
 
@@ -32528,7 +32528,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fno_pie" >&5
 printf "%s\n" "$ax_cv_check_cflags___fno_pie" >&6; }
-if test x"$ax_cv_check_cflags___fno_pie" = xyes
+if test "x$ax_cv_check_cflags___fno_pie" = xyes
 then :
 
 		_CFLAGS="$CFLAGS"
@@ -32619,7 +32619,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fPIE" >&5
 printf "%s\n" "$ax_cv_check_cflags___fPIE" >&6; }
-if test x"$ax_cv_check_cflags___fPIE" = xyes
+if test "x$ax_cv_check_cflags___fPIE" = xyes
 then :
 
 		_CFLAGS="$CFLAGS"
@@ -33056,7 +33056,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___fcf_protection" >&5
 printf "%s\n" "$ax_cv_check_cflags___fcf_protection" >&6; }
-if test x"$ax_cv_check_cflags___fcf_protection" = xyes
+if test "x$ax_cv_check_cflags___fcf_protection" = xyes
 then :
 
 	{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether the linker accepts -fcf-protection" >&5
@@ -33473,7 +33473,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___Wshadow" >&5
 printf "%s\n" "$ax_cv_check_cflags___Wshadow" >&6; }
-if test x"$ax_cv_check_cflags___Wshadow" = xyes
+if test "x$ax_cv_check_cflags___Wshadow" = xyes
 then :
   CFLAGS="$CFLAGS -Wshadow"
 else case e in #(
@@ -33514,7 +33514,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___Wvla" >&5
 printf "%s\n" "$ax_cv_check_cflags___Wvla" >&6; }
-if test x"$ax_cv_check_cflags___Wvla" = xyes
+if test "x$ax_cv_check_cflags___Wvla" = xyes
 then :
   CFLAGS="$CFLAGS -Wvla"
 else case e in #(
@@ -33555,7 +33555,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___Walloca" >&5
 printf "%s\n" "$ax_cv_check_cflags___Walloca" >&6; }
-if test x"$ax_cv_check_cflags___Walloca" = xyes
+if test "x$ax_cv_check_cflags___Walloca" = xyes
 then :
   CFLAGS="$CFLAGS -Walloca"
 else case e in #(
@@ -33596,7 +33596,7 @@ esac
 fi
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ax_cv_check_cflags___Wtrampolines" >&5
 printf "%s\n" "$ax_cv_check_cflags___Wtrampolines" >&6; }
-if test x"$ax_cv_check_cflags___Wtrampolines" = xyes
+if test "x$ax_cv_check_cflags___Wtrampolines" = xyes
 then :
   CFLAGS="$CFLAGS -Wtrampolines"
 else case e in #(

m4/ax_append_flag.m4

@@ -1,5 +1,5 @@
 # ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_append_flag.html
+#      https://www.gnu.org/software/autoconf-archive/ax_append_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -23,33 +23,12 @@
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
 #
-#   This program is free software: you can redistribute it and/or modify it
+#   Copying and distribution of this file, with or without modification, are
-#   under the terms of the GNU General Public License as published by the
+#   permitted in any medium without royalty provided the copyright notice
-#   Free Software Foundation, either version 3 of the License, or (at your
+#   and this notice are preserved.  This file is offered as-is, without any
-#   option) any later version.
+#   warranty.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
 
-#serial 6
+#serial 8
 
 AC_DEFUN([AX_APPEND_FLAG],
 [dnl

m4/ax_check_compile_flag.m4

@@ -1,10 +1,10 @@
 # ===========================================================================
-#   http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
+#  https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
 # ===========================================================================
 #
 # SYNOPSIS
 #
-#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS])
+#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
 #
 # DESCRIPTION
 #
@@ -19,6 +19,8 @@
 #   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
 #   force the compiler to issue an error when a bad flag is given.
 #
+#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
+#
 #   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
 #   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
 #
@@ -27,45 +29,24 @@
 #   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
 #   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
 #
-#   This program is free software: you can redistribute it and/or modify it
+#   Copying and distribution of this file, with or without modification, are
-#   under the terms of the GNU General Public License as published by the
+#   permitted in any medium without royalty provided the copyright notice
-#   Free Software Foundation, either version 3 of the License, or (at your
+#   and this notice are preserved.  This file is offered as-is, without any
-#   option) any later version.
+#   warranty.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
 
-#serial 2
+#serial 6
 
 AC_DEFUN([AX_CHECK_COMPILE_FLAG],
-[AC_PREREQ(2.59)dnl for _AC_LANG_PREFIX
+[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
 AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
 AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
   ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
   _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
-  AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
+  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
     [AS_VAR_SET(CACHEVAR,[yes])],
     [AS_VAR_SET(CACHEVAR,[no])])
   _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
-AS_IF([test x"AS_VAR_GET(CACHEVAR)" = xyes],
+AS_VAR_IF(CACHEVAR,yes,
   [m4_default([$2], :)],
   [m4_default([$3], :)])
 AS_VAR_POPDEF([CACHEVAR])dnl

m4/ax_func_snprintf.m4

@@ -1,5 +1,5 @@
 # ===========================================================================
-#     http://www.gnu.org/software/autoconf-archive/ax_func_snprintf.html
+#     https://www.gnu.org/software/autoconf-archive/ax_func_snprintf.html
 # ===========================================================================
 #
 # SYNOPSIS
@@ -24,8 +24,9 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 5
+#serial 7
 
+AU_ALIAS([AC_FUNC_SNPRINTF], [AX_FUNC_SNPRINTF])
 AC_DEFUN([AX_FUNC_SNPRINTF],
 [AC_CHECK_FUNCS(snprintf vsnprintf)
 AC_MSG_CHECKING(for working snprintf)

m4/ax_prog_cc_for_build.m4

@@ -32,7 +32,7 @@
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.
 
-#serial 20
+#serial 21
 
 AU_ALIAS([AC_PROG_CC_FOR_BUILD], [AX_PROG_CC_FOR_BUILD])
 AC_DEFUN([AX_PROG_CC_FOR_BUILD], [dnl
@@ -89,16 +89,16 @@ AC_LANG_PUSH([C])
 dnl The pushdef([ac_cv_c_compiler_gnu], ...) currently does not cover
 dnl the use of this variable in _AC_LANG_COMPILER_GNU called by
 dnl AC_PROG_CC. Unset this cache variable temporarily as a workaround.
-was_set_ac_cv_c_compiler_gnu=${[ac_cv_c_compiler_gnu]+y}
+was_set_c_compiler_gnu=${[ac_cv_c_compiler_gnu]+y}
-AS_IF([test ${was_set_ac_cv_c_compiler_gnu}],
+AS_IF([test ${was_set_c_compiler_gnu}],
-    [saved_ac_cv_c_compiler_gnu=$[ac_cv_c_compiler_gnu]
+    [saved_c_compiler_gnu=$[ac_cv_c_compiler_gnu]
     AS_UNSET([[ac_cv_c_compiler_gnu]])])
 
 AC_PROG_CC
 
 dnl Restore ac_cv_c_compiler_gnu
-AS_IF([test ${was_set_ac_cv_c_compiler_gnu}],
+AS_IF([test ${was_set_c_compiler_gnu}],
-  [[ac_cv_c_compiler_gnu]=saved_ac_cv_c_compiler_gnu])
+  [[ac_cv_c_compiler_gnu]=$[saved_c_compiler_gnu]])
 
 _AC_COMPILER_EXEEXT
 _AC_COMPILER_OBJEXT