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Use -Wno-always-true only if $CC accepts it. GCC 4.1 doesn't.

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Kalle Olavi Niemitalo 2007-02-22 10:59:25 +02:00 committed by Kalle Olavi Niemitalo
parent d8ffd3b4b6
commit 67ee2205f3
1 changed files with 17 additions and 2 deletions
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19
configure.in
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@ -1413,13 +1413,28 @@ if test "x$ac_cv_prog_gcc" = "xyes"; then
;;
4.*)
# Do not show warnings related to (char * | unsigned char *) type
# difference. Do not show "always evaluate as true".
CFLAGS="$CFLAGS -fno-strict-aliasing -Wno-pointer-sign -Wno-always-true"
# difference.
CFLAGS="$CFLAGS -fno-strict-aliasing -Wno-pointer-sign"
;;
*)
# These should be ok using -Werror
;;
esac
# GCC 4.2 snapshots warn that comparisons like &object != NULL
# always return true. Some macros in ELinks check whether pointer
# arguments are NULL, and giving them addresses of named objects
# triggers the warning. These warnings have not revealed any real
# bugs, so shut them up instead of complicating the code. GCC 4.1
# does not recognize -Wno-always-true and exits with code 1 if it is
# given.
AC_MSG_CHECKING([whether $CC accepts -Wno-always-true])
EL_SAVE_FLAGS
CFLAGS="$CFLAGS -Wno-always-true"
AC_TRY_COMPILE([], [],
[AC_MSG_RESULT([yes])],
[EL_RESTORE_FLAGS
AC_MSG_RESULT([no])])
fi
EL_LOG_CONFIG(CFLAGS, [Compiler flags (CFLAGS)], [])