On 2020-12-07 17:47, Ard Biesheuvel wrote:
On Mon, 7 Dec 2020 at 18:41, Marc Zyngier <maz@xxxxxxxxxx> wrote:
On 2020-12-07 17:19, Ard Biesheuvel wrote:
(resend with David's email address fixed)
Irk. Thanks for that.
+#ifdef CONFIG_CC_HAS_BROKEN_S_CONSTRAINT
+#define SYM_CONSTRAINT "i"
+#else
+#define SYM_CONSTRAINT "S"
+#endif
+
Could we just check GCC_VERSION here?
I guess we could. But I haven't investigated which exact range of
compiler is broken (GCC 6.3 seems fixed, but that's the oldest
I have apart from the offending 4.9).
I tried 5.4 on godbolt, and it seems happy. And the failure will be
obvious, so we can afford to get it slightly wrong and refine it
later.
FWIW the Linaro 14.11, 15.02 and 15.05 releases of GCC 4.9.3 seem to
build rc7 without complaint. The only thing older that I have to hand is
Ubuntu's GCC 4.8.4, which Kbuild chokes on entirely now.
Robin.
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