X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/8ea6525e3a092b76256fbed7d6edbb0a1861aee1..3dc50b3bc2f11909b6edf51ea6e9414228235c2e:/configure.ac diff --git a/configure.ac b/configure.ac index d6a86a73..992e2033 100644 --- a/configure.ac +++ b/configure.ac @@ -1,6 +1,6 @@ # 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 @@ -18,7 +18,7 @@ # 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]]) @@ -26,7 +26,7 @@ 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], [$PACKAGE_COPYRIGHT_YEAR], [The copyright year for this package]) @@ -60,6 +60,20 @@ AC_PROG_CXX # Gnulib (early checks). gl_EARLY +# Gnulib uses '#pragma GCC diagnostic push' to silence some +# warnings, but older gcc doesn't support this. +AC_CACHE_CHECK([whether pragma GCC diagnostic push works], + [lv_cv_gcc_pragma_push_works], [ + save_CFLAGS=$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 $enable_gcc_warnings in @@ -69,23 +83,53 @@ AC_ARG_ENABLE([gcc-warnings], [enable_gcc_warnings=no]) if test "$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' + -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]) @@ -94,13 +138,24 @@ if test "$enable_gcc_warnings" = yes; then [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=$save_CXXFLAGS AC_LANG_POP([C++]) fi BISON_TEST_FOR_WORKING_C_COMPILER +BISON_C_COMPILER_POSIXLY_CORRECT BISON_TEST_FOR_WORKING_CXX_COMPILER +BISON_CXX_COMPILER_POSIXLY_CORRECT AC_ARG_ENABLE([yacc], [AC_HELP_STRING([--disable-yacc], @@ -118,8 +173,12 @@ AC_SUBST([YACC_SCRIPT]) AC_SUBST([YACC_LIBRARY]) # Checks for programs. +AM_MISSING_PROG([DOT], [dot]) AC_PROG_LEX -$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=: +} AC_PROG_YACC AC_PROG_RANLIB AC_PROG_GNU_M4 @@ -174,10 +233,16 @@ case $VALGRIND:$host_os in '':*) ;; *: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])