# Configure template for GNU Bison. -*-Autoconf-*-
#
-# Copyright (C) 2001-2012 Free Software Foundation, Inc.
+# Copyright (C) 2001-2013 Free Software Foundation, Inc.
#
# 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
# In order for some versions of Sun Studio to compile our C++ test cases
# correctly, we need Autoconf 2.64 or better to handle the restrict
# keyword in at least string.h from gnulib. We need Autoconf 2.68 or
-# better to avoid a typo in the `configure --help' entry for the YACC
+# better to avoid a typo in the 'configure --help' entry for the YACC
# environment variable.
AC_PREREQ([2.68])
m4_pattern_forbid([^gl_[A-Z]])
AC_INIT([GNU Bison],
m4_esyscmd([build-aux/git-version-gen .tarball-version]),
[bug-bison@gnu.org])
-AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2012])
+AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2013])
AC_DEFINE_UNQUOTED([PACKAGE_COPYRIGHT_YEAR], [$PACKAGE_COPYRIGHT_YEAR],
[The copyright year for this package])
# Gnulib (early checks).
gl_EARLY
+# Gnulib uses '#pragma GCC diagnostic push' to silence some
+# warnings, but older gcc doesn't support this.
+AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
+ [lv_cv_gcc_pragma_push_works], [
+ save_CFLAGS=$CFLAGS
+ CFLAGS='-Wunknown-pragmas -Werror'
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+ #pragma GCC diagnostic push
+ #pragma GCC diagnostic pop
+ ]])],
+ [lv_cv_gcc_pragma_push_works=yes],
+ [lv_cv_gcc_pragma_push_works=no])
+ CFLAGS=$save_CFLAGS])
+
AC_ARG_ENABLE([gcc-warnings],
[ --enable-gcc-warnings turn on lots of GCC warnings (not recommended)],
[case $enable_gcc_warnings in
esac],
[enable_gcc_warnings=no])
if test "$enable_gcc_warnings" = yes; then
- warn_common='-Wall -Wextra -Wno-sign-compare -Wcast-align
- -Wcast-qual -Wformat -Wpointer-arith -Wwrite-strings'
- warn_c='-Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes
- -Wshadow -Wstrict-prototypes'
+ warn_common='-Wall-Wextra -Wno-sign-compare -Wcast-align -Wdocumentation
+ -Wformat -Wpointer-arith -Wwrite-strings'
+ warn_c='-Wbad-function-cast -Wshadow -Wstrict-prototypes'
warn_cxx='-Wnoexcept'
+ # Warnings for the test suite only.
+ #
+ # -fno-color-diagnostics: Clang's use of colors in the error
+ # messages is confusing the tests looking at the compiler's output
+ # (e.g., synclines.at).
+ warn_tests='-Wundef -pedantic -Wsign-compare -fno-color-diagnostics'
AC_LANG_PUSH([C])
+ # Clang supports many of GCC's -W options, but only issues warnings
+ # on the ones it does not recognize. In that case, gl_WARN_ADD
+ # thinks the option is supported, and unknown options are then added
+ # to CFLAGS. But then, when -Werror is added in the test suite for
+ # instance, the warning about the unknown option turns into an
+ # error.
+ #
+ # This should be addressed by gnulib's gl_WARN_ADD, but in the
+ # meanwhile, turn warnings about unknown options into errors in
+ # CFLAGS, and restore CFLAGS after the tests.
+ save_CFLAGS=$CFLAGS
+ gl_WARN_ADD([-Werror=unknown-warning-option], [CFLAGS])
for i in $warn_common $warn_c;
do
gl_WARN_ADD([$i], [WARN_CFLAGS])
done
gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
+
+ # Warnings for the test suite, and maybe for bison if GCC is modern
+ # enough.
+ gl_WARN_ADD([-Wmissing-declarations], [WARN_CFLAGS_TEST])
+ gl_WARN_ADD([-Wmissing-prototypes], [WARN_CFLAGS_TEST])
+ test $lv_cv_gcc_pragma_push_works = yes &&
+ AS_VAR_APPEND([WARN_CFLAGS], [" $WARN_CFLAGS_TEST"])
+
# Warnings for the test suite only.
- gl_WARN_ADD([-Wundef], [WARN_CFLAGS_TEST])
- gl_WARN_ADD([-pedantic], [WARN_CFLAGS_TEST])
+ for i in $warn_tests;
+ do
+ gl_WARN_ADD([$i], [WARN_CFLAGS_TEST])
+ done
+ CFLAGS=$save_CFLAGS
AC_LANG_POP([C])
AC_LANG_PUSH([C++])
+ save_CXXFLAGS=$CXXFLAGS
+ gl_WARN_ADD([-Werror=unknown-warning-option], [CXXFLAGS])
for i in $warn_common $warn_cxx;
do
gl_WARN_ADD([$i], [WARN_CXXFLAGS])
[AC_LANG_PROGRAM([], [nullptr])])
gl_WARN_ADD([-Werror], [WERROR_CXXFLAGS])
# Warnings for the test suite only.
- gl_WARN_ADD([-Wundef], [WARN_CXXFLAGS_TEST])
- gl_WARN_ADD([-pedantic], [WARN_CXXFLAGS_TEST])
+ for i in $warn_tests;
+ do
+ gl_WARN_ADD([$i], [WARN_CXXFLAGS_TEST])
+ done
+ # Clang++ 3.2+ reject C code generated by Flex.
+ gl_WARN_ADD([-Wno-null-conversion], [FLEX_SCANNER_CXXFLAGS])
+ # So does G++ 4.8...
+ gl_WARN_ADD([-Wno-sign-compare], [FLEX_SCANNER_CXXFLAGS])
+ # ... possiby in std=c++11 mode.
+ gl_WARN_ADD([-Wno-zero-as-null-pointer-constant], [FLEX_SCANNER_CXXFLAGS])
+ CXXFLAGS=$save_CXXFLAGS
AC_LANG_POP([C++])
fi
BISON_TEST_FOR_WORKING_C_COMPILER
+BISON_C_COMPILER_POSIXLY_CORRECT
BISON_TEST_FOR_WORKING_CXX_COMPILER
+BISON_CXX_COMPILER_POSIXLY_CORRECT
AC_ARG_ENABLE([yacc],
[AC_HELP_STRING([--disable-yacc],
AC_SUBST([YACC_LIBRARY])
# Checks for programs.
+AM_MISSING_PROG([DOT], [dot])
AC_PROG_LEX
-$LEX_IS_FLEX || AC_MSG_ERROR([Flex is required])
+$LEX_IS_FLEX || test "X$LEX" = X: || {
+ AC_MSG_WARN([bypassing lex because flex is required])
+ LEX=:
+}
+AM_CONDITIONAL([FLEX_CXX_WORKS],
+ [$LEX_IS_FLEX && test $bison_cv_cxx_works = yes])
AC_PROG_YACC
AC_PROG_RANLIB
AC_PROG_GNU_M4
'':*) ;;
*:darwin*)
# See README-hacking.
- # VALGRIND+=' --suppressions=$(abs_top_srcdir)/build-aux/darwin11.4.0.valgrind'
+ # VALGRIND+='-q --suppressions=$(abs_top_srcdir)/build-aux/darwin11.4.0.valgrind'
VALGRIND=;;
*:*)
- AC_SUBST([VALGRIND_PREBISON], ["$VALGRIND -q"]);;
+ suppfile=build-aux/$host_os.valgrind
+ if test -f "$srcdir/$suppfile"; then
+ VALGRIND="$VALGRIND --gen-suppressions=all"
+ VALGRIND="$VALGRIND --suppressions=\$(abs_top_srcdir)/$suppfile"
+ fi
+ AC_SUBST([VALGRIND_PREBISON], ["$VALGRIND -q"])
+ ;;
esac
AM_MISSING_PROG([AUTOM4TE], [autom4te])
projects / bison.git / blobdiff