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

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[ Backported from ELinks 0.12.GIT.  The 0.11 branch is still using
  older Autoconf macros.  ]
This commit is contained in:
Kalle Olavi Niemitalo 2007-09-24 10:17:19 +03:00 committed by Kalle Olavi Niemitalo
parent 8165e85d82
commit fa20852ce2
1 changed files with 18 additions and 14 deletions
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28
configure.in
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@ -1318,20 +1318,24 @@ if test "x$ac_cv_prog_gcc" = "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.
for warning_flag in -Wno-address -Wno-always-true; do
AC_MSG_CHECKING([whether $CC accepts $warning_flag])
EL_SAVE_FLAGS EL_SAVE_FLAGS
CFLAGS="$CFLAGS -Wno-always-true" CFLAGS="$CFLAGS $warning_flag"
AC_TRY_COMPILE([], [], AC_TRY_COMPILE([], [],
[AC_MSG_RESULT([yes])], [AC_MSG_RESULT([yes])
[EL_RESTORE_FLAGS break],
AC_MSG_RESULT([no])]) [AC_MSG_RESULT([no])])
EL_RESTORE_FLAGS
done
fi fi
# CFLAGS doesn't contain all compile flags. Some will be added only when # CFLAGS doesn't contain all compile flags. Some will be added only when