build: new configure option --enable-gcc-warnings

[chaz/tar] / configure.ac

diff --git a/configure.ac b/configure.ac
index c3a3af775a427bd169733f3f97ffa6e9044c8297..35edb08afc81d30a26fac4631921c41f9e376e23 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -19,12 +19,12 @@
 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 # 02110-1301, USA.
 
-AC_INIT([GNU tar], [1.23.90], [bug-tar@gnu.org])
+AC_INIT([GNU tar], [1.26.90], [bug-tar@gnu.org])
 AC_CONFIG_SRCDIR([src/tar.c])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_HEADERS([config.h])
 AC_PREREQ([2.63])
-AM_INIT_AUTOMAKE([1.11 gnits tar-ustar dist-bzip2 dist-shar std-options silent-rules])
+AM_INIT_AUTOMAKE([1.11 gnits tar-ustar dist-bzip2 dist-xz dist-shar std-options silent-rules])
 
 # Enable silent rules by default:
 AM_SILENT_RULES([yes])
@@ -70,6 +70,29 @@ if test $diff_cv_st_fstype_string = yes; then
     [Define if struct stat has a char st_fstype[] member.])
 fi
 
+# even if we use gnulib's acl.h with integrated m4 file later on (used because
+# of very useful file_has_acl() function) we need following checks that restrict
+# tar to use POSIX.1e ACLs only.
+AC_ARG_WITH([posix-acls],
+    AS_HELP_STRING([--without-posix-acls],
+                   [do not use POSIX.1e access control lists]),
+    [with_posix_acls=no])
+if test "x$with_posix_acls" != "xno"; then
+  AC_CHECK_HEADERS(sys/acl.h,, [with_posix_acl=no])
+  AC_SEARCH_LIBS([acl_get_file],  [acl pacl],, [with_posix_acl=no])
+  AC_SEARCH_LIBS([acl_get_fd],    [acl pacl],, [with_posix_acl=no])
+  AC_SEARCH_LIBS([acl_set_file],  [acl pacl],, [with_posix_acl=no])
+  AC_SEARCH_LIBS([acl_set_fd],    [acl pacl],, [with_posix_acl=no])
+  AC_SEARCH_LIBS([acl_to_text],   [acl pacl],, [with_posix_acl=no])
+  AC_SEARCH_LIBS([acl_from_text], [acl pacl],, [with_posix_acl=no])
+  if test "x$with_posix_acls" != xno; then
+    AC_DEFINE(HAVE_POSIX_ACLS,,[Define when we have working POSIX acls])
+  fi
+else
+  # disable acls in gnulib's checks
+  export enable_acl=no
+fi
+
 AC_TYPE_SIGNAL
 AC_TYPE_MODE_T
 AC_TYPE_PID_T
@@ -90,7 +113,90 @@ gl_INIT
 # paxutils modules
 tar_PAXUTILS
 
+AC_ARG_ENABLE([gcc-warnings],
+  [AS_HELP_STRING([--enable-gcc-warnings],
+     [turn on many GCC warnings (for developers; best with GNU make)])],
+  [case $enableval in
+     yes|no) ;;
+     *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
+   esac
+   gl_gcc_warnings=$enableval],
+  [if test -d "$srcdir"/.git; then
+     gl_gcc_warnings=yes
+   else
+     gl_gcc_warnings=no
+   fi]
+)
+
+if test "$gl_gcc_warnings" = yes; then
+  gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
+  AC_SUBST([WERROR_CFLAGS])
+
+  nw=
+  # This, $nw, is the list of warnings we disable.
+  nw="$nw -Wformat-nonliteral"      # warnings in Fedora 17 stdio.h
+  nw="$nw -Wvla"                    # warnings in gettext.h
+  nw="$nw -Wswitch-default"         # Too many warnings for now
+  nw="$nw -Wunsafe-loop-optimizations" # It's OK to omit unsafe optimizations.
+  nw="$nw -Winline"                 # It's OK to not inline.
+  nw="$nw -Wstrict-overflow"       # It's OK to optimize strictly.
+  nw="$nw -Wsuggest-attribute=pure" # Too many warnings for now.
+
+  gl_MANYWARN_ALL_GCC([ws])
+  gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
+  for w in $ws; do
+    gl_WARN_ADD([$w])
+  done
+  gl_WARN_ADD([-Wno-sign-compare])     # Too many warnings for now
+  gl_WARN_ADD([-Wno-type-limits])      # It's OK to optimize based on types.
+  gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now
+  gl_WARN_ADD([-Wno-format-nonliteral])
+
+  gl_WARN_ADD([-fdiagnostics-show-option])
+  gl_WARN_ADD([-funit-at-a-time])
+
+  AC_SUBST([WARN_CFLAGS])
+
+  AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
+  AH_VERBATIM([FORTIFY_SOURCE],
+  [/* Enable compile-time and run-time bounds-checking, and some warnings,
+      without upsetting glibc 2.15+. */
+   #if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
+   # define _FORTIFY_SOURCE 2
+   #endif
+  ])
+  AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])
+
+  # Use a slightly smaller set of warning options for lib/.
+  # Remove the following and save the result in GNULIB_WARN_CFLAGS.
+  nw=
+  nw="$nw -Wmissing-prototypes"
+  nw="$nw -Wunused-macros"
+  #
+  # These are for argp.
+  nw="$nw -Wmissing-field-initializers"
+  nw="$nw -Wshadow"
+  #
+  gl_MANYWARN_COMPLEMENT([GNULIB_WARN_CFLAGS], [$WARN_CFLAGS], [$nw])
+
+  # This is also for argp.
+  gl_WARN_ADD([-Wno-missing-field-initializers], [GNULIB_WARN_CFLAGS])
+
+  AC_SUBST([GNULIB_WARN_CFLAGS])
+
+  # For gnulib-tests, the set is slightly smaller still.
+  nw=
+  # It's not worth being this picky about test programs.
+  nw="$nw -Wsuggest-attribute=const"
+  gl_MANYWARN_COMPLEMENT([GNULIB_TEST_WARN_CFLAGS],
+                         [$GNULIB_WARN_CFLAGS], [$nw])
+  AC_SUBST([GNULIB_TEST_WARN_CFLAGS])
+fi
+
+TAR_HEADERS_ATTR_XATTR_H
+
 AC_CHECK_FUNCS_ONCE([fchmod fchown fsync lstat mkfifo readlink symlink])
+
 AC_CHECK_DECLS([getgrgid],,, [#include <grp.h>])
 AC_CHECK_DECLS([getpwuid],,, [#include <pwd.h>])
 AC_CHECK_DECLS([time],,, [#include <time.h>])
@@ -157,7 +263,7 @@ if test -z "$DEFAULT_ARCHIVE"; then
   DEFAULT_ARCHIVE=-
 else
   if test -z "`ls $DEFAULT_ARCHIVE 2>/dev/null`"; then
-    AC_MSG_WARN(DEFAULT_ARCHIVE \`$DEFAULT_ARCHIVE' not found on this system)
+    AC_MSG_WARN(DEFAULT_ARCHIVE '$DEFAULT_ARCHIVE' not found on this system)
   fi
   # FIXME: Look for DEFTAPE in <sys/mtio.h>.
   # FIXME: Let DEVICE_PREFIX be configured from the environment.