2cb2cd242c
C89 allowed a type specifier to be elided with the resulting type being int, aka implicit int behavior. This feature was subsequently removed in C99 without a deprecation period, so implementations continued to support the feature. Now, as with implicit function declarations, is a good time to reevaluate the need for this support. This patch allows -Wimplicit-int to issue warnings in C89 mode (off by default), defaults the warning to an error in C99 through C17, and disables support for the feature entirely in C2x. It also removes a warning about missing declaration specifiers that really was just an implicit int warning in disguise and other minor related cleanups.
46 lines
3.0 KiB
C
46 lines
3.0 KiB
C
// RUN: %clang_cc1 -fsyntax-only -std=c2x -DTEST_SPELLING -verify=c2x %s
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// RUN: %clang_cc1 -fsyntax-only -std=c2x -DTEST_SPELLING -fms-compatibility -verify=c2x-ms %s
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// RUN: %clang_cc1 -fsyntax-only -std=c2x -Wpre-c2x-compat -verify=c2x-compat %s
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// RUN: %clang_cc1 -fsyntax-only -std=c99 -verify=c99 %s
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// RUN: %clang_cc1 -fsyntax-only -std=c99 -pedantic -verify=c99-pedantic %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++17 -verify=cxx17 -x c++ %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++17 -pedantic -verify=cxx17-pedantic -x c++ %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++98 -verify=cxx98 -x c++ %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++98 -pedantic -verify=cxx98-pedantic -x c++ %s
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// RUN: %clang_cc1 -fsyntax-only -std=c++17 -Wpre-c++17-compat -verify=cxx17-compat -x c++ %s
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// cxx17-no-diagnostics
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#ifdef TEST_SPELLING
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// Only test the C++ spelling in C mode in some of the tests, to reduce the
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// amount of diagnostics to have to check. This spelling is allowed in MS-
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// compatibility mode in C, but otherwise produces errors.
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static_assert(1, ""); // c2x-error {{expected parameter declarator}} \
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// c2x-error {{expected ')'}} \
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// c2x-note {{to match this '('}} \
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// c2x-error {{a type specifier is required for all declarations}} \
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// c2x-ms-warning {{use of 'static_assert' without inclusion of <assert.h> is a Microsoft extension}}
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#endif
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// We support _Static_assert as an extension in older C modes and in all C++
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// modes, but only as a pedantic warning.
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_Static_assert(1, ""); // c99-pedantic-warning {{'_Static_assert' is a C11 extension}} \
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// cxx17-pedantic-warning {{'_Static_assert' is a C11 extension}} \
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// cxx98-pedantic-warning {{'_Static_assert' is a C11 extension}}
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// _Static_assert without a message has more complex diagnostic logic:
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// * In C++17 or C2x mode, it's supported by default.
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// * But there is a special compat warning flag to warn about portability to
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// older standards.
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// * In older standard pedantic modes, warn about supporting without a
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// message as an extension.
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_Static_assert(1); // c99-pedantic-warning {{'_Static_assert' with no message is a C2x extension}} \
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// c99-warning {{'_Static_assert' with no message is a C2x extension}} \
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// cxx98-pedantic-warning {{'static_assert' with no message is a C++17 extension}} \
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// cxx98-warning {{'static_assert' with no message is a C++17 extension}} \
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// c2x-compat-warning {{'_Static_assert' with no message is incompatible with C standards before C2x}} \
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// cxx17-compat-warning {{'static_assert' with no message is incompatible with C++ standards before C++17}} \
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// c99-pedantic-warning {{'_Static_assert' is a C11 extension}} \
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// cxx17-pedantic-warning {{'_Static_assert' is a C11 extension}} \
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// cxx98-pedantic-warning {{'_Static_assert' is a C11 extension}}
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