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Use STL capabilities to choose GTEST_HAS_STD_WSTRING default

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If the standard library claims not to support wide character strings, disable `GTEST_HAS_STD_WSTRING` and disallow users overriding it. If the standard library implementation can't be recognized, fall back to using the existing list of OSes with a known lack of support.

PiperOrigin-RevId: 964237076
Change-Id: I906f296259f8f17099990d51447a0d0d04dead66
This commit is contained in:
Abseil Team
2026-08-13 12:44:03 -07:00
committed by Copybara-Service
parent aa1eefe02c
commit 49495eacfd
1 changed files with 51 additions and 7 deletions
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googletest/include/gtest/internal/gtest-port.h
+51 -7
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@@ -500,12 +500,38 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
#endif // defined(_MSC_VER) || defined(__BORLANDC__)
#endif // GTEST_HAS_EXCEPTIONS
#ifndef GTEST_HAS_STD_WSTRING
// The user didn't tell us whether ::std::wstring is available, so we need
// to figure it out.
// 1. Calculate default GTEST_HAS_STD_WSTRING values based on STL capabilities.
#if defined(_MSVC_STL_VERSION)
// Microsoft's STL implementation always supports ::std::wstring.
#define GTEST_HAS_STD_WSTRING_DEFAULT 1
#elif defined(_LIBCPP_VERSION)
// Modern libc++ always defines _LIBCPP_HAS_WIDE_CHARACTERS; its value
// determines whether wide characters are supported.
// Older libc++ omits a definition for _LIBCPP_HAS_NO_WIDE_CHARACTERS when wide
// characters are supported.
#if (defined(_LIBCPP_HAS_WIDE_CHARACTERS) && !_LIBCPP_HAS_WIDE_CHARACTERS) || \
defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS)
#define GTEST_HAS_STD_WSTRING_DEFAULT 0
#else
#define GTEST_HAS_STD_WSTRING_DEFAULT 1
#endif
#elif defined(__GLIBCXX__)
#if defined(_GLIBCXX_USE_WCHAR_T) && _GLIBCXX_USE_WCHAR_T
#define GTEST_HAS_STD_WSTRING_DEFAULT 1
#else
#define GTEST_HAS_STD_WSTRING_DEFAULT 0
#endif
#else
// Unknown standard library implementation; fall back looking at the OS.
//
// Always let the user override the defaults in this case; they might have more
// information about what's supported than we do.
#if defined(GTEST_OS_LINUX_ANDROID)
// Android started supporting std::wstring with API Level 21 (Lollipop).
#define GTEST_HAS_STD_WSTRING (__ANDROID_API__ >= 21)
#define GTEST_HAS_STD_WSTRING_DEFAULT (__ANDROID_API__ >= 21)
// The following platforms are known not to support ::std::wstring; assume it's
// supported on all others.
//
@@ -516,11 +542,29 @@ typedef struct _RTL_CRITICAL_SECTION GTEST_CRITICAL_SECTION;
defined(GTEST_OS_ESP8266) || defined(GTEST_OS_XTENSA) || \
defined(GTEST_OS_QURT) || defined(GTEST_OS_NXP_QN9090) || \
defined(GTEST_OS_NRF52)
#define GTEST_HAS_STD_WSTRING 0
#define GTEST_HAS_STD_WSTRING_DEFAULT 0
#else
#define GTEST_HAS_STD_WSTRING 1
#define GTEST_HAS_STD_WSTRING_DEFAULT 1
#endif
#endif
// 2. Validate explicit user overrides (if user passed -DGTEST_HAS_*=1) against
// what the standard library implementation tells us it supports.
#if defined(GTEST_HAS_STD_WSTRING) && GTEST_HAS_STD_WSTRING
#if defined(_LIBCPP_VERSION) && \
((defined(_LIBCPP_HAS_WIDE_CHARACTERS) && !_LIBCPP_HAS_WIDE_CHARACTERS) || \
defined(_LIBCPP_HAS_NO_WIDE_CHARACTERS))
#error Cannot explicitly enable GTEST_HAS_STD_WSTRING without libc++ wide character support.
#elif defined(__GLIBCXX__) && \
!(defined(_GLIBCXX_USE_WCHAR_T) && _GLIBCXX_USE_WCHAR_T)
#error Cannot explicitly enable GTEST_HAS_STD_WSTRING without libstdc++ wide character support.
#endif
#endif
// 3. Set final values if not explicitly overridden by user
#if !defined(GTEST_HAS_STD_WSTRING)
#define GTEST_HAS_STD_WSTRING GTEST_HAS_STD_WSTRING_DEFAULT
#endif
#endif // GTEST_HAS_STD_WSTRING
#ifndef GTEST_HAS_FILE_SYSTEM
// Most platforms support a file system.