e7228062b2
Standard C allows all standard headers to declare macros for all their functions. So after possibly including any standard header like <ctype.h>, it's perfectly normal for any and all of the functions it declares to be defined as macros. Standard C requires explicit `#undef` before using that identifier in a way that is not compatible with function-like macro definitions. The C standard's rules for this are extended to POSIX as well for the interfaces it defines, and it's the expected norm for nonstandard extensions declared by standard C library headers too. So far the only place this has come up for llvm-libc's code is with the isascii function in Fuchsia's libc. But other cases can arise for any standard (or common extension) function names that source code in llvm-libc is using in nonstandard ways, i.e. as C++ identifiers. The only correct and robust way to handle the possible inclusion of standard C library headers when building llvm-libc source code is to use `#undef` explicitly for each identifier before using it. The easy and obvious place to do that is in the per-function header. This requires that all code, such as test code, that might include any standard C library headers, e.g. via utils/UnitTest/Test.h, make sure to include those *first* before the per-function header. This change does that for isascii and its test. But it should be done uniformly for all the code and documented as a consistent convention so new implementation files are sure to get this right. Reviewed By: sivachandra Differential Revision: https://reviews.llvm.org/D94642
15 lines
542 B
C++
15 lines
542 B
C++
//===-- Header for setting up the Fuchsia tests -----------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIBC_UTILS_UNITTEST_FUCHSIATEST_H
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#define LLVM_LIBC_UTILS_UNITTEST_FUCHSIATEST_H
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#include <zxtest/zxtest.h>
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#endif // LLVM_LIBC_UTILS_UNITTEST_FUCHSIATEST_H
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