From c3bd5ffdc8a3b459f18ba6e35fca93e29f3b0ab0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Tor=20Arne=20Vestb=C3=B8?= Date: Sun, 8 Dec 2019 23:47:10 +0100 Subject: Don't wrap feature detection macros with QT_HAS_FOO() variants Using wrappers for these macros is problematic when for example passing the -frewrite-includes flag to preprocess sources before shipping off to distcc or Icecream. It will also start producing warnings when compilers implement http://eel.is/c++draft/cpp.cond#7.sentence-2. See for example https://reviews.llvm.org/D49091 Both https://clang.llvm.org/docs/LanguageExtensions.html and the SD-6 document at https://isocpp.org/std/standing-documents/sd-6-sg10-feature-test-recommendations recommend defining '__has_foo(x) 0' as a fallback for compilers without the macros, so that's what we go for. Change-Id: I0298cd3b4a6ff6618821e34642a5ddd6728be767 Reviewed-by: Alex Richardson Reviewed-by: Thiago Macieira --- src/corelib/global/qnumeric_p.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/corelib/global/qnumeric_p.h') diff --git a/src/corelib/global/qnumeric_p.h b/src/corelib/global/qnumeric_p.h index 86e7997680..fdfcbda6ca 100644 --- a/src/corelib/global/qnumeric_p.h +++ b/src/corelib/global/qnumeric_p.h @@ -249,7 +249,7 @@ QT_WARNING_POP // size_t. Implementations for 8- and 16-bit types will work but may not be as // efficient. Implementations for 64-bit may be missing on 32-bit platforms. -#if (defined(Q_CC_GNU) && (Q_CC_GNU >= 500) || (defined(Q_CC_INTEL) && !defined(Q_OS_WIN))) || QT_HAS_BUILTIN(__builtin_add_overflow) +#if (defined(Q_CC_GNU) && (Q_CC_GNU >= 500) || (defined(Q_CC_INTEL) && !defined(Q_OS_WIN))) || __has_builtin(__builtin_add_overflow) // GCC 5, ICC 18, and Clang 3.8 have builtins to detect overflows template inline -- cgit v1.2.3