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GCC 4.2.1 needs -Wno-address, not -Wno-always-true.

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Kalle Olavi Niemitalo 2007-09-24 10:17:19 +03:00 committed by Kalle Olavi Niemitalo
parent 27057926b9
commit 5d7e26fc90
1 changed files with 18 additions and 12 deletions
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30
configure.in
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@ -1423,18 +1423,24 @@ if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
;; ;;
esac esac
# GCC 4.2 snapshots warn that comparisons like &object != NULL # GCC 4.2.1 warns if we use the address of an object in Boolean context:
# always return true. Some macros in ELinks check whether pointer # warning: the address of `builtin_modules' will always evaluate as `true'
# arguments are NULL, and giving them addresses of named objects # This hits the object_lock and foreach_module macros in particular.
# triggers the warning. These warnings have not revealed any real # It would be okay to put something in the macros to avoid the warning,
# bugs, so shut them up instead of complicating the code. GCC 4.1 # but currently this seems to require defining parallel macros that skip
# does not recognize -Wno-always-true and exits with code 1 if it is # the NULL check, and that's too ugly. So we instead disable the warning.
# given. # GCC 4.2.1 needs -Wno-address, but GCC 4.2 snapshots need -Wno-always-true.
AC_MSG_CHECKING([whether $CC accepts -Wno-always-true]) # GCC 4.1.3 recognizes neither and exits with code 1 if they are given.
EL_SAVE_FLAGS for warning_flag in -Wno-address -Wno-always-true; do
CFLAGS="$CFLAGS -Wno-always-true" AC_MSG_CHECKING([whether $CC accepts $warning_flag])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[AC_MSG_RESULT([yes])],[EL_RESTORE_FLAGS EL_SAVE_FLAGS
AC_MSG_RESULT([no])]) CFLAGS="$CFLAGS $warning_flag"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[AC_MSG_RESULT([yes])
break],
[AC_MSG_RESULT([no])])
EL_RESTORE_FLAGS
done
fi fi
EL_LOG_CONFIG(CFLAGS, [Compiler flags (CFLAGS)], []) EL_LOG_CONFIG(CFLAGS, [Compiler flags (CFLAGS)], [])