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The new warning flag is `-Winvalid-gnu-asm-cast`, which is enabled by default and is a downgradable diagnostic which defaults to an error. This language dialect flag only controls whether a single diagnostic is emitted as a warning or as an error, and has never been expanded to include other behaviors. Given the rather perjorative name, it's better for us to just expose a diagnostic flag for the one warning in question and let the user elect to do `-Wno-error=` if they need to. There's not a lot of use of the language dialect flag in the wild, but there is some use of it. For the time being, this aliases the -f flag to `-Wno-error=invalid-gnu-asm-cast`, but the -f flag can eventually be removed.
10 lines
363 B
C
10 lines
363 B
C
// RUN: %clang_cc1 %s -verify -Wno-error=invalid-gnu-asm-cast
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void foo(void) {
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int a;
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// PR3788
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asm("nop" : : "m"((int)(a))); // expected-warning {{invalid use of a cast in an inline asm context requiring an lvalue}}
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// PR3794
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asm("nop" : "=r"((unsigned)a)); // expected-warning {{invalid use of a cast in an inline asm context requiring an lvalue}}
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}
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