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GCC 4.2.1 needs -Wno-address, not -Wno-always-true.
[ Backported from ELinks 0.12.GIT. The 0.11 branch is still using older Autoconf macros. ]
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32
configure.in
32
configure.in
@ -1318,20 +1318,24 @@ if test "x$ac_cv_prog_gcc" = "xyes"; then
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;;
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esac
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# GCC 4.2 snapshots warn that comparisons like &object != NULL
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# always return true. Some macros in ELinks check whether pointer
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# arguments are NULL, and giving them addresses of named objects
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# triggers the warning. These warnings have not revealed any real
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# bugs, so shut them up instead of complicating the code. GCC 4.1
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# does not recognize -Wno-always-true and exits with code 1 if it is
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# given.
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AC_MSG_CHECKING([whether $CC accepts -Wno-always-true])
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EL_SAVE_FLAGS
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CFLAGS="$CFLAGS -Wno-always-true"
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AC_TRY_COMPILE([], [],
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[AC_MSG_RESULT([yes])],
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[EL_RESTORE_FLAGS
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AC_MSG_RESULT([no])])
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# GCC 4.2.1 warns if we use the address of an object in Boolean context:
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# warning: the address of `builtin_modules' will always evaluate as `true'
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# This hits the object_lock and foreach_module macros in particular.
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# It would be okay to put something in the macros to avoid the warning,
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# but currently this seems to require defining parallel macros that skip
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# the NULL check, and that's too ugly. So we instead disable the warning.
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# GCC 4.2.1 needs -Wno-address, but GCC 4.2 snapshots need -Wno-always-true.
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# GCC 4.1.3 recognizes neither and exits with code 1 if they are given.
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for warning_flag in -Wno-address -Wno-always-true; do
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AC_MSG_CHECKING([whether $CC accepts $warning_flag])
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EL_SAVE_FLAGS
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CFLAGS="$CFLAGS $warning_flag"
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AC_TRY_COMPILE([], [],
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[AC_MSG_RESULT([yes])
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break],
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[AC_MSG_RESULT([no])])
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EL_RESTORE_FLAGS
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done
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fi
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# CFLAGS doesn't contain all compile flags. Some will be added only when
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