Fix quoting of AC_LANG_SOURCE arguments

[Bruno Haible]

Some changequote invocations in the *.m4 files looked wrong. And indeed
a bug was lurking in there, in printf.m4.


2020-08-16  Bruno Haible  <bruno@clisp.org>

        Fix quoting of AC_LANG_SOURCE arguments.
        * m4/printf.m4 (gl_PRINTF_ENOMEM): Fix an m4 quoting bug in the
        GL_NOCRASH expansion.
        * m4/locale-ar.m4 (gt_LOCALE_AR): Simplify m4 quoting.
        * m4/locale-fr.m4 (gt_LOCALE_FR, gt_LOCALE_FR_UTF8): Likewise.
        * m4/locale-ja.m4 (gt_LOCALE_JA): Likewise.
        * m4/locale-tr.m4 (gt_LOCALE_TR_UTF8): Likewise.
        * m4/locale-zh.m4 (gt_LOCALE_ZH_CN): Likewise.

diff --git a/m4/locale-ar.m4 b/m4/locale-ar.m4
index a754b29..e59181d 100644
--- a/m4/locale-ar.m4
+++ b/m4/locale-ar.m4
@@ -1,4 +1,4 @@
-# locale-ar.m4 serial 8
+# locale-ar.m4 serial 9
 dnl Copyright (C) 2003, 2005-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -12,8 +12,7 @@ AC_DEFUN([gt_LOCALE_AR],
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_REQUIRE([AM_LANGINFO_CODESET])
   AC_CACHE_CHECK([for a traditional Arabic locale], [gt_cv_locale_ar], [
-    AC_LANG_CONFTEST([AC_LANG_SOURCE([
-changequote(,)dnl
+    AC_LANG_CONFTEST([AC_LANG_SOURCE([[
 #include <locale.h>
 #include <time.h>
 #if HAVE_LANGINFO_CODESET
@@ -61,8 +60,7 @@ int main () {
   return 0;
 #endif
 }
-changequote([,])dnl
-      ])])
+      ]])])
     if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
       case "$host_os" in
         # Handle native Windows specially, because there setlocale() interprets
diff --git a/m4/locale-fr.m4 b/m4/locale-fr.m4
index 5abe052..406951f 100644
--- a/m4/locale-fr.m4
+++ b/m4/locale-fr.m4
@@ -1,4 +1,4 @@
-# locale-fr.m4 serial 19
+# locale-fr.m4 serial 20
 dnl Copyright (C) 2003, 2005-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -12,8 +12,7 @@ AC_DEFUN([gt_LOCALE_FR],
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_REQUIRE([AM_LANGINFO_CODESET])
   AC_CACHE_CHECK([for a traditional french locale], [gt_cv_locale_fr], [
-    AC_LANG_CONFTEST([AC_LANG_SOURCE([
-changequote(,)dnl
+    AC_LANG_CONFTEST([AC_LANG_SOURCE([[
 #include <locale.h>
 #include <time.h>
 #if HAVE_LANGINFO_CODESET
@@ -78,8 +77,7 @@ int main () {
   return 0;
 #endif
 }
-changequote([,])dnl
-      ])])
+      ]])])
     if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
       case "$host_os" in
         # Handle native Windows specially, because there setlocale() interprets
@@ -143,8 +141,7 @@ AC_DEFUN([gt_LOCALE_FR_UTF8],
 [
   AC_REQUIRE([AM_LANGINFO_CODESET])
   AC_CACHE_CHECK([for a french Unicode locale], [gt_cv_locale_fr_utf8], [
-    AC_LANG_CONFTEST([AC_LANG_SOURCE([
-changequote(,)dnl
+    AC_LANG_CONFTEST([AC_LANG_SOURCE([[
 #include <locale.h>
 #include <time.h>
 #if HAVE_LANGINFO_CODESET
@@ -206,8 +203,7 @@ int main () {
 #endif
   return 0;
 }
-changequote([,])dnl
-      ])])
+      ]])])
     if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
       case "$host_os" in
         # Handle native Windows specially, because there setlocale() interprets
diff --git a/m4/locale-ja.m4 b/m4/locale-ja.m4
index 0982ab1..31e95b8 100644
--- a/m4/locale-ja.m4
+++ b/m4/locale-ja.m4
@@ -1,4 +1,4 @@
-# locale-ja.m4 serial 14
+# locale-ja.m4 serial 15
 dnl Copyright (C) 2003, 2005-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -12,8 +12,7 @@ AC_DEFUN([gt_LOCALE_JA],
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_REQUIRE([AM_LANGINFO_CODESET])
   AC_CACHE_CHECK([for a traditional japanese locale], [gt_cv_locale_ja], [
-    AC_LANG_CONFTEST([AC_LANG_SOURCE([
-changequote(,)dnl
+    AC_LANG_CONFTEST([AC_LANG_SOURCE([[
 #include <locale.h>
 #include <time.h>
 #if HAVE_LANGINFO_CODESET
@@ -82,8 +81,7 @@ int main ()
   return 0;
 #endif
 }
-changequote([,])dnl
-      ])])
+      ]])])
     if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
       case "$host_os" in
         # Handle native Windows specially, because there setlocale() interprets
diff --git a/m4/locale-tr.m4 b/m4/locale-tr.m4
index 75a45b8..b88a8a3 100644
--- a/m4/locale-tr.m4
+++ b/m4/locale-tr.m4
@@ -1,4 +1,4 @@
-# locale-tr.m4 serial 12
+# locale-tr.m4 serial 13
 dnl Copyright (C) 2003, 2005-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -12,8 +12,7 @@ AC_DEFUN([gt_LOCALE_TR_UTF8],
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_REQUIRE([AM_LANGINFO_CODESET])
   AC_CACHE_CHECK([for a turkish Unicode locale], [gt_cv_locale_tr_utf8], [
-    AC_LANG_CONFTEST([AC_LANG_SOURCE([
-changequote(,)dnl
+    AC_LANG_CONFTEST([AC_LANG_SOURCE([[
 #include <locale.h>
 #include <time.h>
 #if HAVE_LANGINFO_CODESET
@@ -75,8 +74,7 @@ int main () {
     return 1;
   return 0;
 }
-changequote([,])dnl
-      ])])
+      ]])])
     if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
       case "$host_os" in
         # Handle native Windows specially, because there setlocale() interprets
diff --git a/m4/locale-zh.m4 b/m4/locale-zh.m4
index cde5140..c60883c 100644
--- a/m4/locale-zh.m4
+++ b/m4/locale-zh.m4
@@ -1,4 +1,4 @@
-# locale-zh.m4 serial 14
+# locale-zh.m4 serial 15
 dnl Copyright (C) 2003, 2005-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -12,8 +12,7 @@ AC_DEFUN([gt_LOCALE_ZH_CN],
   AC_REQUIRE([AC_CANONICAL_HOST])
   AC_REQUIRE([AM_LANGINFO_CODESET])
   AC_CACHE_CHECK([for a transitional chinese locale], [gt_cv_locale_zh_CN], [
-    AC_LANG_CONFTEST([AC_LANG_SOURCE([
-changequote(,)dnl
+    AC_LANG_CONFTEST([AC_LANG_SOURCE([[
 #include <locale.h>
 #include <stdlib.h>
 #include <time.h>
@@ -83,8 +82,7 @@ int main ()
   return 0;
 #endif
 }
-changequote([,])dnl
-      ])])
+      ]])])
     if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
       case "$host_os" in
         # Handle native Windows specially, because there setlocale() interprets
diff --git a/m4/printf.m4 b/m4/printf.m4
index f5c16ef..8a4aaf6 100644
--- a/m4/printf.m4
+++ b/m4/printf.m4
@@ -1,4 +1,4 @@
-# printf.m4 serial 67
+# printf.m4 serial 68
 dnl Copyright (C) 2003, 2007-2020 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -1072,9 +1072,8 @@ AC_DEFUN([gl_PRINTF_ENOMEM],
       gl_cv_func_printf_enomem="guessing no"
       if test "$cross_compiling" = no; then
         if test $APPLE_UNIVERSAL_BUILD = 0; then
-          AC_LANG_CONFTEST([AC_LANG_SOURCE([
+          AC_LANG_CONFTEST([AC_LANG_SOURCE([[
 ]GL_NOCRASH[
-changequote(,)dnl
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/time.h>
@@ -1119,8 +1118,7 @@ int main()
   ret = printf ("%.5000000f", 1.0);
   return !(ret == 5000002 || (ret < 0 && errno == ENOMEM));
 }
-changequote([,])dnl
-          ])])
+          ]])])
           if AC_TRY_EVAL([ac_link]) && test -s conftest$ac_exeext; then
             (./conftest 2>&AS_MESSAGE_LOG_FD
              result=$?