libphobos: Add section support code for MACHO and PE/COFF

This replaces the original and untested support for Windows and OSX, and
is the 90% of the work needed to support libphobos on those targets.

The core.thread interface has been updated to accomodate for the same
function might be implemented by any of the platform-dependent modules.

libphobos/ChangeLog:

	* libdruntime/Makefile.am (DRUNTIME_DSOURCES): Removed
	gcc/sections/android.d, elf_shared.d, osx.d, win32.d, and win64.d.
	Added gcc/sections/common.d, elf.d macho.d, and pecoff.d.
	* libdruntime/Makefile.in: Regenerate.
	* libdruntime/core/thread/osthread.d: Update externDFunc FQDN names to
	use platform independant section function names.
	* libdruntime/gcc/sections/elf_shared.d: Renamed to...
	* libdruntime/gcc/sections/elf.d: ...this.  Mangle functions for
	core.thread interface as if they come from the gcc.sections module.
	* libdruntime/gcc/sections/package.d: Update public imports, declare
	functions for core.thread interface.
	* libdruntime/gcc/sections/android.d: Removed.
	* libdruntime/gcc/sections/osx.d: Removed.
	* libdruntime/gcc/sections/win32.d: Removed.
	* libdruntime/gcc/sections/win64.d: Removed.
	* libdruntime/gcc/sections/common.d: New file.
	* libdruntime/gcc/sections/macho.d: New file.
	* libdruntime/gcc/sections/pecoff.d: New file.

1 files changed, 39 insertions, 0 deletions

diff --git a/libphobos/libdruntime/gcc/sections/common.d b/libphobos/libdruntime/gcc/sections/common.d
new file mode 100644
index 0000000..85fdc0e
--- /dev/null
+++ b/libphobos/libdruntime/gcc/sections/common.d
@@ -0,0 +1,39 @@
+// Contains various utility functions used by the runtime implementation.
+// Copyright (C) 2019-2021 Free Software Foundation, Inc.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+// for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+module gcc.sections.common;
+
+/**
+ * Asserts that the given condition is `true`.
+ *
+ * The assertion is independent from -release, by abort()ing. Regular assertions
+ * throw an AssertError and thus require an initialized GC, which might not be
+ * the case (yet or anymore) for the startup/shutdown code in this package
+ * (called by CRT ctors/dtors etc.).
+ */
+package(gcc) void safeAssert(
+    bool condition, scope string msg, scope string file = __FILE__, size_t line = __LINE__
+) nothrow @nogc @safe
+{
+    import core.internal.abort;
+    condition || abort(msg, file, line);
+}