9a92f2f742
In GCC, `#pragma GCC diagnostic warning "-Wfoo"` overrides command-line
`-Werror=foo` and errors that can become warnings (pedwarn with
-pedantic-errors and permerror).
```
#pragma GCC diagnostic warning "-Wnarrowing"
int x = {4.2};
#pragma GCC diagnostic warning "-Wundef"
#if FOO
#endif
// gcc -c -Werror=undef -Werror=narrowing => two warnings
```
These diagnostics are similar to our Warning/ExtWarn/Extension
diagnostics with DefaultError. This patch ports the behavior to Clang.
Fix #93474
Pull Request: https://github.com/llvm/llvm-project/pull/93647
64 lines
2.5 KiB
C
64 lines
2.5 KiB
C
// RUN: %clang_cc1 -fsyntax-only -verify -Wno-undef %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Wno-undef -Wno-unknown-warning-option -DAVOID_UNKNOWN_WARNING %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Werror=undef -DINITIAL_UNDEF %s
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#ifdef INITIAL_UNDEF
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#if FOO // expected-error {{'FOO' is not defined}}
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#endif
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#else
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#if FOO // ok.
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#endif
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#endif
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#pragma GCC diagnostic warning "-Wundef"
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#if FOO // expected-warning {{'FOO' is not defined}}
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#endif
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#pragma GCC diagnostic ignored "-Wun" "def"
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#if FOO // ok.
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#endif
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#pragma GCC diagnostic error "-Wundef"
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#if FOO // expected-error {{'FOO' is not defined}}
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#endif
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#define foo error
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#pragma GCC diagnostic foo "-Wundef" // expected-warning {{pragma diagnostic expected 'error', 'warning', 'ignored', 'fatal', 'push', or 'pop'}}
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#pragma GCC diagnostic error 42 // expected-error {{expected string literal in pragma diagnostic}}
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#pragma GCC diagnostic error "-Wundef" 42 // expected-warning {{unexpected token in pragma diagnostic}}
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#pragma GCC diagnostic error "invalid-name" // expected-warning {{pragma diagnostic expected option name (e.g. "-Wundef")}}
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#pragma GCC diagnostic error "-Winvalid-name"
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#ifndef AVOID_UNKNOWN_WARNING
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// expected-warning@-2 {{unknown warning group '-Winvalid-name', ignored}}
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#endif
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// From GH13920
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#pragma clang diagnostic push ignored "-Wdeprecated-declarations" // expected-warning {{unexpected token in pragma diagnostic}}
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#pragma clang diagnostic pop ignored "-Wdeprecated-declarations" // expected-warning {{unexpected token in pragma diagnostic}}
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// Testing pragma clang diagnostic with -Weverything
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void ppo(void){} // First test that we do not diagnose on this.
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#pragma clang diagnostic warning "-Weverything"
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void ppp(void){} // expected-warning {{no previous prototype for function 'ppp'}}
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// expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
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#pragma clang diagnostic ignored "-Weverything" // Reset it.
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void ppq(void){}
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#pragma clang diagnostic error "-Weverything" // Now set to error
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void ppr(void){} // expected-error {{no previous prototype for function 'ppr'}}
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// expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
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#pragma clang diagnostic warning "-Weverything" // Set to warning
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void pps(void){} // expected-warning {{no previous prototype for function 'pps'}}
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// expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
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