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This causes signed integer & pointer overflow to have a defined
behaviour of wrapping according to two's compliment. I.e INT_MAX will
wrap to INT_MIN and vice versa.
This is mainly to cover existing cases, not an invitation to add more.
Cc: Dan Callahan <d.callahan@f5.com>
Suggested-by: Alejandro Colomar <alx@kernel.org>
Reviewed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
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Aliasing is essentially when you access the same memory via different
types.
If the compiler knows this doesn't happen it can make some
optimisations.
There is however code in Unit, for example in the wasm language module
and the websocket code that may fall foul of strict-aliasing rules.
(For the wasm module I explicitly disable it there)
In auto/cc/test for GCC we have
NXT_CFLAGS="$NXT_CFLAGS -O"
...
# -O2 enables -fstrict-aliasing and -fstrict-overflow.
#NXT_CFLAGS="$NXT_CFLAGS -O2"
#NXT_CFLAGS="$NXT_CFLAGS -Wno-strict-aliasing"
So with GCC by default we effectively compile with -fno-strict-aliasing.
For clang we have this
NXT_CFLAGS="$NXT_CFLAGS -O"
...
#NXT_CFLAGS="$NXT_CFLAGS -O2"
...
NXT_CFLAGS="$NXT_CFLAGS -fstrict-aliasing"
(In _clang_, -fstrict-aliasing is always enabled by default)
So in clang we always build with -fstrict-aliasing. I don't think this
is the best idea, building with something as fundamental as this
disabled in one compiler and enabled in another.
This patch adjusts the Clang side of things to match that of GCC. I.e
compile with -fno-strict-aliasing. It also explicitly sets
-fno-strict-aliasing for GCC, which is what we were getting anyway but
lets be explicit about it.
Cc: Dan Callahan <d.callahan@f5.com>
Reviewed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
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Expand on the comment on why we don't enable -Wstrict-overflow=5 on GCC.
Link: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96658>
Reviewed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
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This is what -Wextra used to be called, but any version of GCC or Clang
in at least the last decade has -Wextra.
Cc: Dan Callahan <d.callahan@f5.com>
Reviewed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
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We really only support building Unit with GCC and Clang.
Cc: Dan Callahan <d.callahan@f5.com>
Reviewed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
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We really only support building Unit with GCC and Clang.
Cc: Dan Callahan <d.callahan@f5.com>
Reviewed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
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We only really support building Unit with GCC and Clang.
Cc: Dan Callahan <d.callahan@f5.com>
Reviewed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
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We don't run on Windows and only really support compiling Unit with GCC
and Clang.
Cc: Dan Callahan <d.callahan@f5.com>
Co-developed-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
Signed-off-by: Andrew Clayton <a.clayton@nginx.com>
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