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+2020-10-04 Bruno Haible <bruno@clisp.org>
+
+ Fix warnings from Autoconf 2.69c.
+ * configure.ac: Invoke AC_INIT, AC_OUTPUT without arguments.
+ * doc/configure.ac: Likewise.
+ * lib/configure.ac: Likewise.
+ * src/configure.ac: Invoke AC_INIT, AC_OUTPUT without arguments. Use
+ AC_CACHE_CHECK, AC_LANG_PUSH/AC_LANG_POP, AC_COMPILE_IFELSE
+ * tests/configure.ac: Invoke AC_INIT, AC_OUTPUT without arguments. Use
+ ac_cv_c_compiler_gnu instead of ac_cv_prog_gcc, and
+ ac_cv_cxx_compiler_gnu instead of ac_cv_prog_gxx. Don't use 'test' with
+ option '-a'.
+
2020-08-30 Bruno Haible <bruno@clisp.org>
Make the code C++17 compliant.