+# Sometimes a test group needs to ignore gcc warnings, so it locally
+# sets CFLAGS to this.
+ NO_WERROR_CFLAGS='@CFLAGS@ @WARN_CFLAGS@ @WARN_CFLAGS_TEST@'
+NO_WERROR_CXXFLAGS='@CXXFLAGS@ @WARN_CXXFLAGS@ @WARN_CXXFLAGS_TEST@'
+
+# But most of the time, we want -Werror.
+ CFLAGS="$NO_WERROR_CFLAGS @WERROR_CFLAGS@"
+CXXFLAGS="$NO_WERROR_CXXFLAGS @WERROR_CXXFLAGS@"
+
+# C++ variants break strict aliasing analysis.
+NO_STRICT_ALIAS_CXXFLAGS='@NO_STRICT_ALIAS_CXXFLAGS@'
+
+# If 'exit 77'; skip all C++ tests; otherwise ':'.
+BISON_CXX_WORKS='@BISON_CXX_WORKS@'
+
+# Whether the compiler supports POSIXLY_CORRECT defined.
+: ${C_COMPILER_POSIXLY_CORRECT='@C_COMPILER_POSIXLY_CORRECT@'}
+: ${CXX_COMPILER_POSIXLY_CORRECT='@CXX_COMPILER_POSIXLY_CORRECT@'}
+
+if $POSIXLY_CORRECT_IS_EXPORTED; then
+ $C_COMPILER_POSIXLY_CORRECT ||
+ BISON_C_WORKS="as_fn_error 77 POSIXLY_CORRECT"
+ $CXX_COMPILER_POSIXLY_CORRECT ||
+ BISON_CXX_WORKS="as_fn_error 77 POSIXLY_CORRECT"
+fi
+
+# Handle --compile-c-with-cxx here, once CXX and CXXFLAGS are known.
+if "$at_arg_compile_c_with_cxx"; then
+ CC_IS_CXX=1
+ CC=$CXX
+ NO_WERROR_CFLAGS=$NO_WERROR_CXXFLAGS
+ CFLAGS=$CXXFLAGS
+ BISON_C_WORKS=$BISON_CXX_WORKS
+else
+ CC_IS_CXX=0
+fi
+
+
+## ------- ##
+## Other. ##
+## ------- ##
+
+# Empty if no javac was found
+CONF_JAVAC='@CONF_JAVAC@'
+
+# Empty if no Java VM was found
+CONF_JAVA='@CONF_JAVA@'
+
+# We need egrep and perl.
+: ${EGREP='@EGREP@'}
+: ${PERL='@PERL@'}
+
+# Use simple quotes (lib/quote.c).
+LC_CTYPE=C
+export LC_CTYPE
+
+# Are special link options needed?
+LDFLAGS='@LDFLAGS@'
+
+# Are special libraries needed?
+LIBS="$abs_top_builddir/lib/libbison.a @LIBS@ @INTLLIBS@"
+
+# Empty if no xsltproc was found
+: ${XSLTPROC='@XSLTPROC@'}
+
+# Don't just check if $POSIXLY_CORRECT is set, as Bash, when launched
+# as /bin/sh, sets the shell variable POSIXLY_CORRECT to y, but not
+# the environment variable.
+: ${C_COMPILER_POSIXLY_CORRECT='@C_COMPILER_POSIXLY_CORRECT@'}
+if env | grep '^POSIXLY_CORRECT=' >/dev/null; then
+ POSIXLY_CORRECT_IS_EXPORTED=true
+else
+ POSIXLY_CORRECT_IS_EXPORTED=false
+fi