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diff --git a/graphics/asymptote/gc/include/gc_config_macros.h b/graphics/asymptote/gc/include/gc_config_macros.h
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@@ -0,0 +1,466 @@
+/*
+ * Copyright (c) 1994 by Xerox Corporation. All rights reserved.
+ * Copyright (c) 1996 by Silicon Graphics. All rights reserved.
+ * Copyright (c) 1998 by Fergus Henderson. All rights reserved.
+ * Copyright (c) 2000-2009 by Hewlett-Packard Development Company.
+ * All rights reserved.
+ * Copyright (c) 2008-2020 Ivan Maidanski
+ *
+ * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
+ * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
+ *
+ * Permission is hereby granted to use or copy this program
+ * for any purpose, provided the above notices are retained on all copies.
+ * Permission to modify the code and to distribute modified code is granted,
+ * provided the above notices are retained, and a notice that the code was
+ * modified is included with the above copyright notice.
+ */
+
+/* This should never be included directly; it is included only from gc.h. */
+/* We separate it only to make gc.h more suitable as documentation. */
+#if defined(GC_H)
+
+/* Convenient internal macro to test version of GCC. */
+#if defined(__GNUC__) && defined(__GNUC_MINOR__)
+# define GC_GNUC_PREREQ(major, minor) \
+ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((major) << 16) + (minor))
+#else
+# define GC_GNUC_PREREQ(major, minor) 0 /* FALSE */
+#endif
+
+/* Some tests for old macros. These violate our namespace rules and */
+/* will disappear shortly. Use the GC_ names. */
+#if defined(SOLARIS_THREADS) || defined(_SOLARIS_THREADS) \
+ || defined(_SOLARIS_PTHREADS) || defined(GC_SOLARIS_PTHREADS)
+ /* We no longer support old style Solaris threads. */
+ /* GC_SOLARIS_THREADS now means pthreads. */
+# ifndef GC_SOLARIS_THREADS
+# define GC_SOLARIS_THREADS
+# endif
+#endif
+#if defined(IRIX_THREADS)
+# define GC_IRIX_THREADS
+#endif
+#if defined(DGUX_THREADS) && !defined(GC_DGUX386_THREADS)
+# define GC_DGUX386_THREADS
+#endif
+#if defined(AIX_THREADS)
+# define GC_AIX_THREADS
+#endif
+#if defined(HPUX_THREADS)
+# define GC_HPUX_THREADS
+#endif
+#if defined(OSF1_THREADS)
+# define GC_OSF1_THREADS
+#endif
+#if defined(LINUX_THREADS)
+# define GC_LINUX_THREADS
+#endif
+#if defined(WIN32_THREADS)
+# define GC_WIN32_THREADS
+#endif
+#if defined(RTEMS_THREADS)
+# define GC_RTEMS_PTHREADS
+#endif
+#if defined(USE_LD_WRAP)
+# define GC_USE_LD_WRAP
+#endif
+
+#if defined(GC_WIN32_PTHREADS) && !defined(GC_WIN32_THREADS)
+ /* Using pthreads-win32 library (or other Win32 implementation). */
+# define GC_WIN32_THREADS
+#endif
+
+#if defined(GC_AIX_THREADS) || defined(GC_DARWIN_THREADS) \
+ || defined(GC_DGUX386_THREADS) || defined(GC_FREEBSD_THREADS) \
+ || defined(GC_HPUX_THREADS) \
+ || defined(GC_IRIX_THREADS) || defined(GC_LINUX_THREADS) \
+ || defined(GC_NETBSD_THREADS) || defined(GC_OPENBSD_THREADS) \
+ || defined(GC_OSF1_THREADS) || defined(GC_SOLARIS_THREADS) \
+ || defined(GC_WIN32_THREADS) || defined(GC_RTEMS_PTHREADS)
+# ifndef GC_THREADS
+# define GC_THREADS
+# endif
+#elif defined(GC_THREADS)
+# if defined(__linux__)
+# define GC_LINUX_THREADS
+# elif defined(__OpenBSD__)
+# define GC_OPENBSD_THREADS
+# elif defined(_PA_RISC1_1) || defined(_PA_RISC2_0) || defined(hppa) \
+ || defined(__HPPA) || (defined(__ia64) && defined(_HPUX_SOURCE))
+# define GC_HPUX_THREADS
+# elif defined(__HAIKU__)
+# define GC_HAIKU_THREADS
+# elif (defined(__DragonFly__) || defined(__FreeBSD_kernel__) \
+ || defined(__FreeBSD__)) && !defined(GC_NO_FREEBSD)
+# define GC_FREEBSD_THREADS
+# elif defined(__NetBSD__)
+# define GC_NETBSD_THREADS
+# elif defined(__alpha) || defined(__alpha__) /* && !Linux && !xBSD */
+# define GC_OSF1_THREADS
+# elif (defined(mips) || defined(__mips) || defined(_mips)) \
+ && !(defined(nec_ews) || defined(_nec_ews) \
+ || defined(ultrix) || defined(__ultrix))
+# define GC_IRIX_THREADS
+# elif defined(__sparc) /* && !Linux */ \
+ || ((defined(sun) || defined(__sun)) \
+ && (defined(i386) || defined(__i386__) \
+ || defined(__amd64) || defined(__amd64__)))
+# define GC_SOLARIS_THREADS
+# elif defined(__APPLE__) && defined(__MACH__)
+# define GC_DARWIN_THREADS
+# endif
+# if defined(DGUX) && (defined(i386) || defined(__i386__))
+# define GC_DGUX386_THREADS
+# endif
+# if defined(_AIX)
+# define GC_AIX_THREADS
+# endif
+# if (defined(_WIN32) || defined(_MSC_VER) || defined(__BORLANDC__) \
+ || defined(__CYGWIN32__) || defined(__CYGWIN__) || defined(__CEGCC__) \
+ || defined(_WIN32_WCE) || defined(__MINGW32__)) \
+ && !defined(GC_WIN32_THREADS)
+ /* Either posix or native Win32 threads. */
+# define GC_WIN32_THREADS
+# endif
+# if defined(__rtems__) && (defined(i386) || defined(__i386__))
+# define GC_RTEMS_PTHREADS
+# endif
+#endif /* GC_THREADS */
+
+#undef GC_PTHREADS
+#if (!defined(GC_WIN32_THREADS) || defined(GC_WIN32_PTHREADS) \
+ || defined(__CYGWIN32__) || defined(__CYGWIN__)) && defined(GC_THREADS) \
+ && !defined(NN_PLATFORM_CTR) && !defined(NN_BUILD_TARGET_PLATFORM_NX)
+ /* Posix threads. */
+# define GC_PTHREADS
+#endif
+
+#if !defined(_PTHREADS) && defined(GC_NETBSD_THREADS)
+# define _PTHREADS
+#endif
+
+#if defined(GC_DGUX386_THREADS) && !defined(_POSIX4A_DRAFT10_SOURCE)
+# define _POSIX4A_DRAFT10_SOURCE 1
+#endif
+
+#if !defined(_REENTRANT) && defined(GC_PTHREADS) && !defined(GC_WIN32_THREADS)
+ /* Better late than never. This fails if system headers that depend */
+ /* on this were previously included. */
+# define _REENTRANT 1
+#endif
+
+#define __GC
+#if !defined(_WIN32_WCE) || defined(__GNUC__)
+# include <stddef.h>
+# if defined(__MINGW32__) && !defined(_WIN32_WCE)
+# include <stdint.h>
+ /* We mention uintptr_t. */
+ /* Perhaps this should be included in pure msft environments */
+ /* as well? */
+# endif
+#else /* _WIN32_WCE */
+ /* Yet more kludges for WinCE. */
+# include <stdlib.h> /* size_t is defined here */
+# ifndef _PTRDIFF_T_DEFINED
+ /* ptrdiff_t is not defined */
+# define _PTRDIFF_T_DEFINED
+ typedef long ptrdiff_t;
+# endif
+#endif /* _WIN32_WCE */
+
+#if !defined(GC_NOT_DLL) && !defined(GC_DLL) \
+ && ((defined(_DLL) && !defined(__GNUC__)) \
+ || (defined(DLL_EXPORT) && defined(GC_BUILD)))
+# define GC_DLL
+#endif
+
+#if defined(GC_DLL) && !defined(GC_API)
+
+# if defined(__CEGCC__)
+# if defined(GC_BUILD)
+# define GC_API __declspec(dllexport)
+# else
+# define GC_API __declspec(dllimport)
+# endif
+
+# elif defined(__MINGW32__)
+# if defined(__cplusplus) && defined(GC_BUILD)
+# define GC_API extern __declspec(dllexport)
+# elif defined(GC_BUILD) || defined(__MINGW32_DELAY_LOAD__)
+# define GC_API __declspec(dllexport)
+# else
+# define GC_API extern __declspec(dllimport)
+# endif
+
+# elif defined(_MSC_VER) || defined(__DMC__) || defined(__BORLANDC__) \
+ || defined(__CYGWIN__)
+# ifdef GC_BUILD
+# define GC_API extern __declspec(dllexport)
+# else
+# define GC_API __declspec(dllimport)
+# endif
+
+# elif defined(__WATCOMC__)
+# ifdef GC_BUILD
+# define GC_API extern __declspec(dllexport)
+# else
+# define GC_API extern __declspec(dllimport)
+# endif
+
+# elif defined(__SYMBIAN32__)
+# ifdef GC_BUILD
+# define GC_API extern EXPORT_C
+# else
+# define GC_API extern IMPORT_C
+# endif
+
+# elif defined(__GNUC__)
+ /* Only matters if used in conjunction with -fvisibility=hidden option. */
+# if defined(GC_BUILD) && !defined(GC_NO_VISIBILITY) \
+ && (GC_GNUC_PREREQ(4, 0) || defined(GC_VISIBILITY_HIDDEN_SET))
+# define GC_API extern __attribute__((__visibility__("default")))
+# endif
+# endif
+#endif /* GC_DLL */
+
+#ifndef GC_API
+# define GC_API extern
+#endif
+
+#ifndef GC_CALL
+# define GC_CALL
+#endif
+
+#ifndef GC_CALLBACK
+# define GC_CALLBACK GC_CALL
+#endif
+
+#ifndef GC_ATTR_MALLOC
+ /* 'malloc' attribute should be used for all malloc-like functions */
+ /* (to tell the compiler that a function may be treated as if any */
+ /* non-NULL pointer it returns cannot alias any other pointer valid */
+ /* when the function returns). If the client code violates this rule */
+ /* by using custom GC_oom_func then define GC_OOM_FUNC_RETURNS_ALIAS. */
+# ifdef GC_OOM_FUNC_RETURNS_ALIAS
+# define GC_ATTR_MALLOC /* empty */
+# elif GC_GNUC_PREREQ(3, 1)
+# define GC_ATTR_MALLOC __attribute__((__malloc__))
+# elif defined(_MSC_VER) && (_MSC_VER >= 1900) && !defined(__EDG__)
+# define GC_ATTR_MALLOC \
+ __declspec(allocator) __declspec(noalias) __declspec(restrict)
+# elif defined(_MSC_VER) && _MSC_VER >= 1400
+# define GC_ATTR_MALLOC __declspec(noalias) __declspec(restrict)
+# else
+# define GC_ATTR_MALLOC
+# endif
+#endif
+
+#ifndef GC_ATTR_ALLOC_SIZE
+ /* 'alloc_size' attribute improves __builtin_object_size correctness. */
+# undef GC_ATTR_CALLOC_SIZE
+# ifdef __clang__
+# if __has_attribute(__alloc_size__)
+# define GC_ATTR_ALLOC_SIZE(argnum) __attribute__((__alloc_size__(argnum)))
+# define GC_ATTR_CALLOC_SIZE(n, s) __attribute__((__alloc_size__(n, s)))
+# else
+# define GC_ATTR_ALLOC_SIZE(argnum) /* empty */
+# endif
+# elif GC_GNUC_PREREQ(4, 3) && !defined(__ICC)
+# define GC_ATTR_ALLOC_SIZE(argnum) __attribute__((__alloc_size__(argnum)))
+# define GC_ATTR_CALLOC_SIZE(n, s) __attribute__((__alloc_size__(n, s)))
+# else
+# define GC_ATTR_ALLOC_SIZE(argnum) /* empty */
+# endif
+#endif
+
+#ifndef GC_ATTR_CALLOC_SIZE
+# define GC_ATTR_CALLOC_SIZE(n, s) /* empty */
+#endif
+
+#ifndef GC_ATTR_NONNULL
+# if GC_GNUC_PREREQ(4, 0)
+# define GC_ATTR_NONNULL(argnum) __attribute__((__nonnull__(argnum)))
+# else
+# define GC_ATTR_NONNULL(argnum) /* empty */
+# endif
+#endif
+
+#ifndef GC_ATTR_CONST
+# if GC_GNUC_PREREQ(4, 0)
+# define GC_ATTR_CONST __attribute__((__const__))
+# else
+# define GC_ATTR_CONST /* empty */
+# endif
+#endif
+
+#ifndef GC_ATTR_DEPRECATED
+# ifdef GC_BUILD
+# undef GC_ATTR_DEPRECATED
+# define GC_ATTR_DEPRECATED /* empty */
+# elif GC_GNUC_PREREQ(4, 0)
+# define GC_ATTR_DEPRECATED __attribute__((__deprecated__))
+# elif defined(_MSC_VER) && _MSC_VER >= 1200
+# define GC_ATTR_DEPRECATED __declspec(deprecated)
+# else
+# define GC_ATTR_DEPRECATED /* empty */
+# endif
+#endif
+
+#if defined(__sgi) && !defined(__GNUC__) && _COMPILER_VERSION >= 720
+# define GC_ADD_CALLER
+# define GC_RETURN_ADDR (GC_word)__return_address
+#endif
+
+#if defined(__linux__) || defined(__GLIBC__)
+# if !defined(__native_client__)
+# include <features.h>
+# endif
+# if (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 1 || __GLIBC__ > 2) \
+ && !defined(__ia64__) \
+ && !defined(GC_MISSING_EXECINFO_H) \
+ && !defined(GC_HAVE_BUILTIN_BACKTRACE)
+# define GC_HAVE_BUILTIN_BACKTRACE
+# endif
+# if defined(__i386__) || defined(__amd64__) || defined(__x86_64__)
+# define GC_CAN_SAVE_CALL_STACKS
+# endif
+#endif /* GLIBC */
+
+#if defined(_MSC_VER) && _MSC_VER >= 1200 /* version 12.0+ (MSVC 6.0+) */ \
+ && !defined(_M_ARM) && !defined(_M_ARM64) \
+ && !defined(_AMD64_) && !defined(_M_X64) && !defined(_WIN32_WCE) \
+ && !defined(GC_HAVE_NO_BUILTIN_BACKTRACE) \
+ && !defined(GC_HAVE_BUILTIN_BACKTRACE)
+# define GC_HAVE_BUILTIN_BACKTRACE
+#endif
+
+#if defined(GC_HAVE_BUILTIN_BACKTRACE) && !defined(GC_CAN_SAVE_CALL_STACKS)
+# define GC_CAN_SAVE_CALL_STACKS
+#endif
+
+#if defined(__sparc__)
+# define GC_CAN_SAVE_CALL_STACKS
+#endif
+
+/* If we're on a platform on which we can't save call stacks, but */
+/* gcc is normally used, we go ahead and define GC_ADD_CALLER. */
+/* We make this decision independent of whether gcc is actually being */
+/* used, in order to keep the interface consistent, and allow mixing */
+/* of compilers. */
+/* This may also be desirable if it is possible but expensive to */
+/* retrieve the call chain. */
+#if (defined(__linux__) || defined(__DragonFly__) || defined(__FreeBSD__) \
+ || defined(__FreeBSD_kernel__) || defined(__HAIKU__) \
+ || defined(__NetBSD__) || defined(__OpenBSD__) \
+ || defined(HOST_ANDROID) || defined(__ANDROID__)) \
+ && !defined(GC_CAN_SAVE_CALL_STACKS)
+# define GC_ADD_CALLER
+# if GC_GNUC_PREREQ(2, 95)
+ /* gcc knows how to retrieve return address, but we don't know */
+ /* how to generate call stacks. */
+# define GC_RETURN_ADDR (GC_word)__builtin_return_address(0)
+# if GC_GNUC_PREREQ(4, 0) && (defined(__i386__) || defined(__amd64__) \
+ || defined(__x86_64__) /* and probably others... */) \
+ && !defined(GC_NO_RETURN_ADDR_PARENT)
+# define GC_HAVE_RETURN_ADDR_PARENT
+# define GC_RETURN_ADDR_PARENT \
+ (GC_word)__builtin_extract_return_addr(__builtin_return_address(1))
+ /* Note: a compiler might complain that calling */
+ /* __builtin_return_address with a nonzero argument is unsafe. */
+# endif
+# else
+ /* Just pass 0 for gcc compatibility. */
+# define GC_RETURN_ADDR 0
+# endif
+#endif /* !GC_CAN_SAVE_CALL_STACKS */
+
+#ifdef GC_PTHREADS
+
+# if (defined(GC_DARWIN_THREADS) || defined(GC_WIN32_PTHREADS) \
+ || defined(__native_client__) || defined(GC_RTEMS_PTHREADS)) \
+ && !defined(GC_NO_DLOPEN)
+ /* Either there is no dlopen() or we do not need to intercept it. */
+# define GC_NO_DLOPEN
+# endif
+
+# if (defined(GC_DARWIN_THREADS) || defined(GC_WIN32_PTHREADS) \
+ || defined(__native_client__)) \
+ && !defined(GC_NO_PTHREAD_SIGMASK)
+ /* Either there is no pthread_sigmask() or no need to intercept it. */
+# define GC_NO_PTHREAD_SIGMASK
+# endif
+
+# if defined(__native_client__)
+ /* At present, NaCl pthread_create() prototype does not have */
+ /* "const" for its "attr" argument; also, NaCl pthread_exit() one */
+ /* does not have "noreturn" attribute. */
+# ifndef GC_PTHREAD_CREATE_CONST
+# define GC_PTHREAD_CREATE_CONST /* empty */
+# endif
+# ifndef GC_HAVE_PTHREAD_EXIT
+# define GC_HAVE_PTHREAD_EXIT
+# define GC_PTHREAD_EXIT_ATTRIBUTE /* empty */
+# endif
+# endif
+
+# if !defined(GC_HAVE_PTHREAD_EXIT) \
+ && !defined(HOST_ANDROID) && !defined(__ANDROID__) \
+ && (defined(GC_LINUX_THREADS) || defined(GC_SOLARIS_THREADS))
+# define GC_HAVE_PTHREAD_EXIT
+ /* Intercept pthread_exit on Linux and Solaris. */
+# if GC_GNUC_PREREQ(2, 7)
+# define GC_PTHREAD_EXIT_ATTRIBUTE __attribute__((__noreturn__))
+# elif defined(__NORETURN) /* used in Solaris */
+# define GC_PTHREAD_EXIT_ATTRIBUTE __NORETURN
+# else
+# define GC_PTHREAD_EXIT_ATTRIBUTE /* empty */
+# endif
+# endif
+
+# if (!defined(GC_HAVE_PTHREAD_EXIT) || defined(__native_client__)) \
+ && !defined(GC_NO_PTHREAD_CANCEL)
+ /* Either there is no pthread_cancel() or no need to intercept it. */
+# define GC_NO_PTHREAD_CANCEL
+# endif
+
+#endif /* GC_PTHREADS */
+
+#ifdef __cplusplus
+
+#ifndef GC_ATTR_EXPLICIT
+# if __cplusplus >= 201103L && !defined(__clang__) || _MSVC_LANG >= 201103L \
+ || defined(CPPCHECK)
+# define GC_ATTR_EXPLICIT explicit
+# else
+# define GC_ATTR_EXPLICIT /* empty */
+# endif
+#endif
+
+#ifndef GC_NOEXCEPT
+# if defined(__DMC__) || (defined(__BORLANDC__) \
+ && (defined(_RWSTD_NO_EXCEPTIONS) || defined(_RWSTD_NO_EX_SPEC))) \
+ || (defined(_MSC_VER) && defined(_HAS_EXCEPTIONS) && !_HAS_EXCEPTIONS) \
+ || (defined(__WATCOMC__) && !defined(_CPPUNWIND))
+# define GC_NOEXCEPT /* empty */
+# ifndef GC_NEW_ABORTS_ON_OOM
+# define GC_NEW_ABORTS_ON_OOM
+# endif
+# elif __cplusplus >= 201103L || _MSVC_LANG >= 201103L
+# define GC_NOEXCEPT noexcept
+# else
+# define GC_NOEXCEPT throw()
+# endif
+#endif
+
+#ifndef GC_CONSTEXPR
+# if __cplusplus >= 202002L
+# define GC_CONSTEXPR constexpr
+# else
+# define GC_CONSTEXPR /* empty */
+# endif
+#endif
+
+#endif /* __cplusplus */
+
+#endif