libphobos: Move rt.sections modules to gcc.sections

These modules depend on a mixture between how the compiler emits
run-time module information, and what functions are exposed by the
platform to inquire about loaded global and thread-local data sections.

As the upstream implementation is written to work only with how the
reference D compiler writes out data, much of what is present does not
apply to the GCC D front-end.  So it has been moved to a non-upstream
location in the source tree, where most of it will be rewritten once
each port has been completed.

The only tested module sections/elf_shared.d has been cleaned up so that
all deprecated declarations have been removed, as well as the brittle
module collision checking, which required bss_sections.c.  All other
ports have been left unchanged apart from a commonizing of attributes.

libphobos/ChangeLog:

2019-04-13  Iain Buclaw  <ibuclaw@gdcproject.org>

	* libdruntime/Makefile.am (DRUNTIME_CSOURCES): Remove bss_sections.c.
	(DRUNTIME_DSOURCES): Rename rt/sections_* modules to gcc/sections/*.
	* libdruntime/Makefile.in: Regenerate.
	* libdruntime/gcc/sections/android.d: New file.
	* libdruntime/gcc/sections/elf_shared.d: New file.
	* libdruntime/gcc/sections/osx.d: New file.
	* libdruntime/gcc/sections/package.d: New file.
	* libdruntime/gcc/sections/solaris.d: New file.
	* libdruntime/gcc/sections/win32.d: New file.
	* libdruntime/gcc/sections/win64.d: New file.
	* libdruntime/rt/bss_section.c: Remove.
	* libdruntime/rt/sections.d: Publicly import gcc.sections.
	* libdruntime/rt/sections_android.d: Remove.
	* libdruntime/rt/sections_elf_shared.d: Remove.
	* libdruntime/rt/sections_osx.d: Remove.
	* libdruntime/rt/sections_solaris.d: Remove.
	* libdruntime/rt/sections_win32.d: Remove.
	* libdruntime/rt/sections_win64.d: Remove.

From-SVN: r270341

libphobos/ChangeLog

+2019-04-13  Iain Buclaw  <ibuclaw@gdcproject.org>
+
+	* libdruntime/Makefile.am (DRUNTIME_CSOURCES): Remove bss_sections.c.
+	(DRUNTIME_DSOURCES): Rename rt/sections_* modules to gcc/sections/*.
+	* libdruntime/Makefile.in: Regenerate.
+	* libdruntime/gcc/sections/android.d: New file.
+	* libdruntime/gcc/sections/elf_shared.d: New file.
+	* libdruntime/gcc/sections/osx.d: New file.
+	* libdruntime/gcc/sections/package.d: New file.
+	* libdruntime/gcc/sections/solaris.d: New file.
+	* libdruntime/gcc/sections/win32.d: New file.
+	* libdruntime/gcc/sections/win64.d: New file.
+	* libdruntime/rt/bss_section.c: Remove.
+	* libdruntime/rt/sections.d: Publicly import gcc.sections.
+	* libdruntime/rt/sections_android.d: Remove.
+	* libdruntime/rt/sections_elf_shared.d: Remove.
+	* libdruntime/rt/sections_osx.d: Remove.
+	* libdruntime/rt/sections_solaris.d: Remove.
+	* libdruntime/rt/sections_win32.d: Remove.
+	* libdruntime/rt/sections_win64.d: Remove.
+
 2019-04-12  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	* configure.ac (AM_INIT_AUTOMAKE): Add subdir-objects.

libphobos/libdruntime/Makefile.am

@@ -122,7 +122,7 @@ DRUNTIME_DSOURCES_GENERATED = gcc/config.d gcc/libbacktrace.d
 # https://www.gnu.org/software/automake/manual/html_node/Wildcards.html
 DRUNTIME_SSOURCES = core/threadasm.S
 
-DRUNTIME_CSOURCES = core/stdc/errno_.c rt/bss_section.c
+DRUNTIME_CSOURCES = core/stdc/errno_.c
 
 DRUNTIME_DSOURCES = core/atomic.d core/attribute.d core/bitop.d \
 	core/checkedint.d core/cpuid.d core/demangle.d core/exception.d \
@@ -140,14 +140,14 @@ DRUNTIME_DSOURCES = core/atomic.d core/attribute.d core/bitop.d \
 	core/sync/config.d core/sync/exception.d core/sync/mutex.d \
 	core/sync/rwmutex.d core/sync/semaphore.d core/thread.d core/time.d \
 	core/vararg.d gcc/attribute.d gcc/backtrace.d gcc/builtins.d gcc/deh.d \
-	gcc/unwind/arm.d gcc/unwind/arm_common.d gcc/unwind/c6x.d \
-	gcc/unwind/generic.d gcc/unwind/package.d gcc/unwind/pe.d object.d \
-	rt/aApply.d rt/aApplyR.d rt/aaA.d rt/adi.d rt/arrayassign.d \
-	rt/arraycast.d rt/arraycat.d rt/cast_.d rt/config.d rt/critical_.d \
-	rt/deh.d rt/dmain2.d rt/invariant.d rt/lifetime.d rt/memory.d \
-	rt/minfo.d rt/monitor_.d rt/obj.d rt/qsort.d rt/sections.d \
-	rt/sections_android.d rt/sections_elf_shared.d rt/sections_osx.d \
-	rt/sections_solaris.d rt/sections_win32.d rt/sections_win64.d \
+	gcc/sections/android.d gcc/sections/elf_shared.d gcc/sections/osx.d \
+	gcc/sections/package.d gcc/sections/solaris.d gcc/sections/win32.d \
+	gcc/sections/win64.d gcc/unwind/arm.d gcc/unwind/arm_common.d \
+	gcc/unwind/c6x.d gcc/unwind/generic.d gcc/unwind/package.d \
+	gcc/unwind/pe.d object.d rt/aApply.d rt/aApplyR.d rt/aaA.d rt/adi.d \
+	rt/arrayassign.d rt/arraycast.d rt/arraycat.d rt/cast_.d rt/config.d \
+	rt/critical_.d rt/deh.d rt/dmain2.d rt/invariant.d rt/lifetime.d \
+	rt/memory.d rt/minfo.d rt/monitor_.d rt/obj.d rt/qsort.d rt/sections.d \
 	rt/switch_.d rt/tlsgc.d rt/typeinfo/ti_Acdouble.d \
 	rt/typeinfo/ti_Acfloat.d rt/typeinfo/ti_Acreal.d \
 	rt/typeinfo/ti_Adouble.d rt/typeinfo/ti_Afloat.d rt/typeinfo/ti_Ag.d \

libphobos/libdruntime/Makefile.in

@@ -194,7 +194,10 @@ am__objects_1 = core/atomic.lo core/attribute.lo core/bitop.lo \
 	core/sync/exception.lo core/sync/mutex.lo core/sync/rwmutex.lo \
 	core/sync/semaphore.lo core/thread.lo core/time.lo \
 	core/vararg.lo gcc/attribute.lo gcc/backtrace.lo \
-	gcc/builtins.lo gcc/deh.lo gcc/unwind/arm.lo \
+	gcc/builtins.lo gcc/deh.lo gcc/sections/android.lo \
+	gcc/sections/elf_shared.lo gcc/sections/osx.lo \
+	gcc/sections/package.lo gcc/sections/solaris.lo \
+	gcc/sections/win32.lo gcc/sections/win64.lo gcc/unwind/arm.lo \
 	gcc/unwind/arm_common.lo gcc/unwind/c6x.lo \
 	gcc/unwind/generic.lo gcc/unwind/package.lo gcc/unwind/pe.lo \
 	object.lo rt/aApply.lo rt/aApplyR.lo rt/aaA.lo rt/adi.lo \
@@ -202,31 +205,29 @@ am__objects_1 = core/atomic.lo core/attribute.lo core/bitop.lo \
 	rt/config.lo rt/critical_.lo rt/deh.lo rt/dmain2.lo \
 	rt/invariant.lo rt/lifetime.lo rt/memory.lo rt/minfo.lo \
 	rt/monitor_.lo rt/obj.lo rt/qsort.lo rt/sections.lo \
-	rt/sections_android.lo rt/sections_elf_shared.lo \
-	rt/sections_osx.lo rt/sections_solaris.lo rt/sections_win32.lo \
-	rt/sections_win64.lo rt/switch_.lo rt/tlsgc.lo \
-	rt/typeinfo/ti_Acdouble.lo rt/typeinfo/ti_Acfloat.lo \
-	rt/typeinfo/ti_Acreal.lo rt/typeinfo/ti_Adouble.lo \
-	rt/typeinfo/ti_Afloat.lo rt/typeinfo/ti_Ag.lo \
-	rt/typeinfo/ti_Aint.lo rt/typeinfo/ti_Along.lo \
-	rt/typeinfo/ti_Areal.lo rt/typeinfo/ti_Ashort.lo \
-	rt/typeinfo/ti_C.lo rt/typeinfo/ti_byte.lo \
-	rt/typeinfo/ti_cdouble.lo rt/typeinfo/ti_cent.lo \
-	rt/typeinfo/ti_cfloat.lo rt/typeinfo/ti_char.lo \
-	rt/typeinfo/ti_creal.lo rt/typeinfo/ti_dchar.lo \
-	rt/typeinfo/ti_delegate.lo rt/typeinfo/ti_double.lo \
-	rt/typeinfo/ti_float.lo rt/typeinfo/ti_idouble.lo \
-	rt/typeinfo/ti_ifloat.lo rt/typeinfo/ti_int.lo \
-	rt/typeinfo/ti_ireal.lo rt/typeinfo/ti_long.lo \
-	rt/typeinfo/ti_n.lo rt/typeinfo/ti_ptr.lo \
-	rt/typeinfo/ti_real.lo rt/typeinfo/ti_short.lo \
-	rt/typeinfo/ti_ubyte.lo rt/typeinfo/ti_ucent.lo \
-	rt/typeinfo/ti_uint.lo rt/typeinfo/ti_ulong.lo \
-	rt/typeinfo/ti_ushort.lo rt/typeinfo/ti_void.lo \
-	rt/typeinfo/ti_wchar.lo rt/util/array.lo \
-	rt/util/container/array.lo rt/util/container/common.lo \
-	rt/util/container/hashtab.lo rt/util/container/treap.lo \
-	rt/util/random.lo rt/util/typeinfo.lo rt/util/utf.lo
+	rt/switch_.lo rt/tlsgc.lo rt/typeinfo/ti_Acdouble.lo \
+	rt/typeinfo/ti_Acfloat.lo rt/typeinfo/ti_Acreal.lo \
+	rt/typeinfo/ti_Adouble.lo rt/typeinfo/ti_Afloat.lo \
+	rt/typeinfo/ti_Ag.lo rt/typeinfo/ti_Aint.lo \
+	rt/typeinfo/ti_Along.lo rt/typeinfo/ti_Areal.lo \
+	rt/typeinfo/ti_Ashort.lo rt/typeinfo/ti_C.lo \
+	rt/typeinfo/ti_byte.lo rt/typeinfo/ti_cdouble.lo \
+	rt/typeinfo/ti_cent.lo rt/typeinfo/ti_cfloat.lo \
+	rt/typeinfo/ti_char.lo rt/typeinfo/ti_creal.lo \
+	rt/typeinfo/ti_dchar.lo rt/typeinfo/ti_delegate.lo \
+	rt/typeinfo/ti_double.lo rt/typeinfo/ti_float.lo \
+	rt/typeinfo/ti_idouble.lo rt/typeinfo/ti_ifloat.lo \
+	rt/typeinfo/ti_int.lo rt/typeinfo/ti_ireal.lo \
+	rt/typeinfo/ti_long.lo rt/typeinfo/ti_n.lo \
+	rt/typeinfo/ti_ptr.lo rt/typeinfo/ti_real.lo \
+	rt/typeinfo/ti_short.lo rt/typeinfo/ti_ubyte.lo \
+	rt/typeinfo/ti_ucent.lo rt/typeinfo/ti_uint.lo \
+	rt/typeinfo/ti_ulong.lo rt/typeinfo/ti_ushort.lo \
+	rt/typeinfo/ti_void.lo rt/typeinfo/ti_wchar.lo \
+	rt/util/array.lo rt/util/container/array.lo \
+	rt/util/container/common.lo rt/util/container/hashtab.lo \
+	rt/util/container/treap.lo rt/util/random.lo \
+	rt/util/typeinfo.lo rt/util/utf.lo
 am__objects_2 = gc/bits.lo gc/config.lo gc/gcinterface.lo \
 	gc/impl/conservative/gc.lo gc/impl/manual/gc.lo gc/os.lo \
 	gc/pooltable.lo gc/proxy.lo
@@ -425,8 +426,7 @@ am__objects_27 = $(am__objects_1) $(am__objects_3) $(am__objects_5) \
 	$(am__objects_13) $(am__objects_15) $(am__objects_17) \
 	$(am__objects_19) $(am__objects_21) $(am__objects_23) \
 	$(am__objects_25) $(am__objects_26)
-am__objects_28 = core/stdc/libgdruntime_la-errno_.lo \
-	rt/libgdruntime_la-bss_section.lo
+am__objects_28 = core/stdc/libgdruntime_la-errno_.lo
 am__objects_29 = core/libgdruntime_la-threadasm.lo
 am__objects_30 = $(am__objects_27) $(am__objects_28) $(am__objects_29)
 am_libgdruntime_la_OBJECTS = $(am__objects_30)
@@ -719,7 +719,7 @@ DRUNTIME_DSOURCES_GENERATED = gcc/config.d gcc/libbacktrace.d
 # Can't use wildcards here:
 # https://www.gnu.org/software/automake/manual/html_node/Wildcards.html
 DRUNTIME_SSOURCES = core/threadasm.S
-DRUNTIME_CSOURCES = core/stdc/errno_.c rt/bss_section.c
+DRUNTIME_CSOURCES = core/stdc/errno_.c
 DRUNTIME_DSOURCES = core/atomic.d core/attribute.d core/bitop.d \
 	core/checkedint.d core/cpuid.d core/demangle.d core/exception.d \
 	core/internal/abort.d core/internal/arrayop.d core/internal/convert.d \
@@ -736,14 +736,14 @@ DRUNTIME_DSOURCES = core/atomic.d core/attribute.d core/bitop.d \
 	core/sync/config.d core/sync/exception.d core/sync/mutex.d \
 	core/sync/rwmutex.d core/sync/semaphore.d core/thread.d core/time.d \
 	core/vararg.d gcc/attribute.d gcc/backtrace.d gcc/builtins.d gcc/deh.d \
-	gcc/unwind/arm.d gcc/unwind/arm_common.d gcc/unwind/c6x.d \
-	gcc/unwind/generic.d gcc/unwind/package.d gcc/unwind/pe.d object.d \
-	rt/aApply.d rt/aApplyR.d rt/aaA.d rt/adi.d rt/arrayassign.d \
-	rt/arraycast.d rt/arraycat.d rt/cast_.d rt/config.d rt/critical_.d \
-	rt/deh.d rt/dmain2.d rt/invariant.d rt/lifetime.d rt/memory.d \
-	rt/minfo.d rt/monitor_.d rt/obj.d rt/qsort.d rt/sections.d \
-	rt/sections_android.d rt/sections_elf_shared.d rt/sections_osx.d \
-	rt/sections_solaris.d rt/sections_win32.d rt/sections_win64.d \
+	gcc/sections/android.d gcc/sections/elf_shared.d gcc/sections/osx.d \
+	gcc/sections/package.d gcc/sections/solaris.d gcc/sections/win32.d \
+	gcc/sections/win64.d gcc/unwind/arm.d gcc/unwind/arm_common.d \
+	gcc/unwind/c6x.d gcc/unwind/generic.d gcc/unwind/package.d \
+	gcc/unwind/pe.d object.d rt/aApply.d rt/aApplyR.d rt/aaA.d rt/adi.d \
+	rt/arrayassign.d rt/arraycast.d rt/arraycat.d rt/cast_.d rt/config.d \
+	rt/critical_.d rt/deh.d rt/dmain2.d rt/invariant.d rt/lifetime.d \
+	rt/memory.d rt/minfo.d rt/monitor_.d rt/obj.d rt/qsort.d rt/sections.d \
 	rt/switch_.d rt/tlsgc.d rt/typeinfo/ti_Acdouble.d \
 	rt/typeinfo/ti_Acfloat.d rt/typeinfo/ti_Acreal.d \
 	rt/typeinfo/ti_Adouble.d rt/typeinfo/ti_Afloat.d rt/typeinfo/ti_Ag.d \
@@ -1083,6 +1083,16 @@ gcc/attribute.lo: gcc/$(am__dirstamp)
 gcc/backtrace.lo: gcc/$(am__dirstamp)
 gcc/builtins.lo: gcc/$(am__dirstamp)
 gcc/deh.lo: gcc/$(am__dirstamp)
+gcc/sections/$(am__dirstamp):
+	@$(MKDIR_P) gcc/sections
+	@: > gcc/sections/$(am__dirstamp)
+gcc/sections/android.lo: gcc/sections/$(am__dirstamp)
+gcc/sections/elf_shared.lo: gcc/sections/$(am__dirstamp)
+gcc/sections/osx.lo: gcc/sections/$(am__dirstamp)
+gcc/sections/package.lo: gcc/sections/$(am__dirstamp)
+gcc/sections/solaris.lo: gcc/sections/$(am__dirstamp)
+gcc/sections/win32.lo: gcc/sections/$(am__dirstamp)
+gcc/sections/win64.lo: gcc/sections/$(am__dirstamp)
 gcc/unwind/$(am__dirstamp):
 	@$(MKDIR_P) gcc/unwind
 	@: > gcc/unwind/$(am__dirstamp)
@@ -1115,12 +1125,6 @@ rt/monitor_.lo: rt/$(am__dirstamp)
 rt/obj.lo: rt/$(am__dirstamp)
 rt/qsort.lo: rt/$(am__dirstamp)
 rt/sections.lo: rt/$(am__dirstamp)
-rt/sections_android.lo: rt/$(am__dirstamp)
-rt/sections_elf_shared.lo: rt/$(am__dirstamp)
-rt/sections_osx.lo: rt/$(am__dirstamp)
-rt/sections_solaris.lo: rt/$(am__dirstamp)
-rt/sections_win32.lo: rt/$(am__dirstamp)
-rt/sections_win64.lo: rt/$(am__dirstamp)
 rt/switch_.lo: rt/$(am__dirstamp)
 rt/tlsgc.lo: rt/$(am__dirstamp)
 rt/typeinfo/$(am__dirstamp):
@@ -1627,7 +1631,6 @@ core/sys/solaris/time.lo: core/sys/solaris/$(am__dirstamp)
 gcc/config.lo: gcc/$(am__dirstamp)
 gcc/libbacktrace.lo: gcc/$(am__dirstamp)
 core/stdc/libgdruntime_la-errno_.lo: core/stdc/$(am__dirstamp)
-rt/libgdruntime_la-bss_section.lo: rt/$(am__dirstamp)
 core/libgdruntime_la-threadasm.lo: core/$(am__dirstamp)
 
 libgdruntime.la: $(libgdruntime_la_OBJECTS) $(libgdruntime_la_DEPENDENCIES) $(EXTRA_libgdruntime_la_DEPENDENCIES) 
@@ -1703,6 +1706,8 @@ mostlyclean-compile:
 	-rm -f gc/impl/manual/*.lo
 	-rm -f gcc/*.$(OBJEXT)
 	-rm -f gcc/*.lo
+	-rm -f gcc/sections/*.$(OBJEXT)
+	-rm -f gcc/sections/*.lo
 	-rm -f gcc/unwind/*.$(OBJEXT)
 	-rm -f gcc/unwind/*.lo
 	-rm -f gcstub/*.$(OBJEXT)
@@ -1743,9 +1748,6 @@ core/libgdruntime_la-threadasm.lo: core/threadasm.S
 core/stdc/libgdruntime_la-errno_.lo: core/stdc/errno_.c
 	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(libgdruntime_la_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o core/stdc/libgdruntime_la-errno_.lo `test -f 'core/stdc/errno_.c' || echo '$(srcdir)/'`core/stdc/errno_.c
 
-rt/libgdruntime_la-bss_section.lo: rt/bss_section.c
-	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(libgdruntime_la_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o rt/libgdruntime_la-bss_section.lo `test -f 'rt/bss_section.c' || echo '$(srcdir)/'`rt/bss_section.c
-
 mostlyclean-libtool:
 	-rm -f *.lo
 
@@ -1785,6 +1787,7 @@ clean-libtool:
 	-rm -rf gc/impl/conservative/.libs gc/impl/conservative/_libs
 	-rm -rf gc/impl/manual/.libs gc/impl/manual/_libs
 	-rm -rf gcc/.libs gcc/_libs
+	-rm -rf gcc/sections/.libs gcc/sections/_libs
 	-rm -rf gcc/unwind/.libs gcc/unwind/_libs
 	-rm -rf gcstub/.libs gcstub/_libs
 	-rm -rf rt/.libs rt/_libs
@@ -1931,6 +1934,7 @@ distclean-generic:
 	-rm -f gc/impl/conservative/$(am__dirstamp)
 	-rm -f gc/impl/manual/$(am__dirstamp)
 	-rm -f gcc/$(am__dirstamp)
+	-rm -f gcc/sections/$(am__dirstamp)
 	-rm -f gcc/unwind/$(am__dirstamp)
 	-rm -f gcstub/$(am__dirstamp)
 	-rm -f rt/$(am__dirstamp)

libphobos/libdruntime/rt/sections_android.d → libphobos/libdruntime/gcc/sections/android.d

-/**
- * Written in the D programming language.
- * This module provides bionic-specific support for sections.
- *
- * Copyright: Copyright Martin Nowak 2012-2013.
- * License:   $(WEB www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
- * Authors:   Martin Nowak
- * Source: $(DRUNTIMESRC src/rt/_sections_android.d)
- */
+// Bionic-specific support for sections.
+// Copyright (C) 2019 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.
 
-module rt.sections_android;
+// 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.android;
 
 version (CRuntime_Bionic):
 
@@ -69,6 +81,8 @@ void initSections() nothrow @nogc
 
     auto pbeg = cast(void*)&_tlsend;
     auto pend = cast(void*)&__bss_end__;
+    // _tlsend is a 32-bit int and may not be 64-bit void*-aligned, so align pbeg.
+    version (D_LP64) pbeg = cast(void*)(cast(size_t)(pbeg + 7) & ~cast(size_t)7);
     _sections._gcRanges[0] = pbeg[0 .. pend - pbeg];
 }
 
@@ -105,32 +119,14 @@ void scanTLSRanges(void[]* rng, scope void delegate(void* pbeg, void* pend) noth
  *       the corresponding address in the TLS dynamic per-thread data.
  */
 
-version (X86)
+extern(C) void* __tls_get_addr( void* p ) nothrow @nogc
 {
-    // NB: the compiler mangles this function as '___tls_get_addr'
-    // even though it is extern(D)
-    extern(D) void* ___tls_get_addr( void* p ) nothrow @nogc
-    {
-        debug(PRINTF) printf("  ___tls_get_addr input - %p\n", p);
+    debug(PRINTF) printf("  __tls_get_addr input - %p\n", p);
     immutable offset = cast(size_t)(p - cast(void*)&_tlsstart);
     auto tls = getTLSBlockAlloc();
     assert(offset < tls.length);
     return tls.ptr + offset;
-    }
-}
-else version (ARM)
-{
-    extern(C) void* __tls_get_addr( void** p ) nothrow @nogc
-    {
-        debug(PRINTF) printf("  __tls_get_addr input - %p\n", *p);
-        immutable offset = cast(size_t)(*p - cast(void*)&_tlsstart);
-        auto tls = getTLSBlockAlloc();
-        assert(offset < tls.length);
-        return tls.ptr + offset;
-    }
 }
-else
-    static assert( false, "Android architecture not supported." );
 
 private:
 
@@ -182,7 +178,7 @@ extern(C)
 
         size_t __bss_end__;
 
-        void* _tlsstart;
-        void* _tlsend;
+        int _tlsstart;
+        int _tlsend;
     }
 }

libphobos/libdruntime/rt/sections_osx.d → libphobos/libdruntime/gcc/sections/osx.d

-/**
- * Written in the D programming language.
- * This module provides OSX-specific support for sections.
- *
- * Copyright: Copyright Digital Mars 2008 - 2012.
- * License: Distributed under the
- *      $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
- *    (See accompanying file LICENSE)
- * Authors:   Walter Bright, Sean Kelly, Martin Nowak
- * Source: $(DRUNTIMESRC src/rt/_sections_osx.d)
- */
+// OSX-specific support for sections.
+// Copyright (C) 2019 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.
 
-module rt.sections_osx;
+// 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.osx;
 
 version (OSX):
 
@@ -35,22 +45,22 @@ struct SectionGroup
         return dg(_sections);
     }
 
-    @property immutable(ModuleInfo*)[] modules() const
+    @property immutable(ModuleInfo*)[] modules() const nothrow @nogc
     {
         return _moduleGroup.modules;
     }
 
-    @property ref inout(ModuleGroup) moduleGroup() inout
+    @property ref inout(ModuleGroup) moduleGroup() inout nothrow @nogc
     {
         return _moduleGroup;
     }
 
-    @property inout(void[])[] gcRanges() inout
+    @property inout(void[])[] gcRanges() inout nothrow @nogc
     {
         return _gcRanges[];
     }
 
-    @property immutable(FuncTable)[] ehTables() const
+    @property immutable(FuncTable)[] ehTables() const nothrow @nogc
     {
         return _ehTables[];
     }
@@ -70,7 +80,7 @@ __gshared bool _isRuntimeInitialized;
 /****
  * Gets called on program startup just before GC is initialized.
  */
-void initSections()
+void initSections() nothrow @nogc
 {
     pthread_key_create(&_tlsKey, null);
     _dyld_register_func_for_add_image(&sections_osx_onAddImage);
@@ -80,19 +90,19 @@ void initSections()
 /***
  * Gets called on program shutdown just after GC is terminated.
  */
-void finiSections()
+void finiSections() nothrow @nogc
 {
     _sections._gcRanges.reset();
     pthread_key_delete(_tlsKey);
     _isRuntimeInitialized = false;
 }
 
-void[]* initTLSRanges()
+void[]* initTLSRanges() nothrow @nogc
 {
     return &getTLSBlock();
 }
 
-void finiTLSRanges(void[]* rng)
+void finiTLSRanges(void[]* rng) nothrow @nogc
 {
     .free(rng.ptr);
     .free(rng);
@@ -148,7 +158,7 @@ body
     assert(0);
 }
 
-ref void[] getTLSBlock()
+ref void[] getTLSBlock() nothrow @nogc
 {
     auto pary = cast(void[]*)pthread_getspecific(_tlsKey);
     if (pary is null)
@@ -180,7 +190,6 @@ ref void[] getTLSBlockAlloc()
     return *pary;
 }
 
-
 __gshared SectionGroup _sections;
 
 extern (C) void sections_osx_onAddImage(in mach_header* h, intptr_t slide)
@@ -245,12 +254,10 @@ struct SegRef
     string sect;
 }
 
-
 static immutable SegRef[] dataSegs = [{SEG_DATA, SECT_DATA},
                                       {SEG_DATA, SECT_BSS},
                                       {SEG_DATA, SECT_COMMON}];
 
-
 ubyte[] getSection(in mach_header* header, intptr_t slide,
                    in char* segmentName, in char* sectionName)
 {

libphobos/libdruntime/gcc/sections/package.d

+// Run-time support for retrieving platform-specific sections.
+// Copyright (C) 2019 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;
+
+version (CRuntime_Glibc)
+    public import gcc.sections.elf_shared;
+else version (CRuntime_Musl)
+    public import gcc.sections.elf_shared;
+else version (CRuntime_UClibc)
+    public import gcc.sections.elf_shared;
+else version (FreeBSD)
+    public import gcc.sections.elf_shared;
+else version (NetBSD)
+    public import gcc.sections.elf_shared;
+else version (DragonFlyBSD)
+    public import gcc.sections.elf_shared;
+else version (Solaris)
+    public import gcc.sections.solaris;
+else version (OSX)
+    public import gcc.sections.osx;
+else version (CRuntime_DigitalMars)
+    public import gcc.sections.win32;
+else version (CRuntime_Microsoft)
+    public import gcc.sections.win64;
+else version (CRuntime_Bionic)
+    public import gcc.sections.android;
+else
+    static assert(0, "unimplemented");

libphobos/libdruntime/rt/sections_solaris.d → libphobos/libdruntime/gcc/sections/solaris.d

-/**
- * Written in the D programming language.
- * This module provides Solaris-specific support for sections.
- *
- * Copyright: Copyright Martin Nowak 2012-2013.
- * License:   $(WEB www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
- * Authors:   Martin Nowak
- * Source: $(DRUNTIMESRC src/rt/_sections_solaris.d)
- */
+// Solaris-specific support for sections.
+// Copyright (C) 2019 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 rt.sections_solaris;
+module gcc.sections.solaris;
 
 version (Solaris):
 

libphobos/libdruntime/rt/sections_win32.d → libphobos/libdruntime/gcc/sections/win32.d

-/**
- * Written in the D programming language.
- * This module provides Win32-specific support for sections.
- *
- * Copyright: Copyright Digital Mars 2008 - 2012.
- * License: Distributed under the
- *      $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
- *    (See accompanying file LICENSE)
- * Authors:   Walter Bright, Sean Kelly, Martin Nowak
- * Source: $(DRUNTIMESRC src/rt/_sections_win32.d)
- */
-
-module rt.sections_win32;
+// Win32-specific support for sections.
+// Copyright (C) 2019 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.win32;
 
 version (CRuntime_DigitalMars):
 

libphobos/libdruntime/rt/sections_win64.d → libphobos/libdruntime/gcc/sections/win64.d

-/**
- * Written in the D programming language.
- * This module provides Win32-specific support for sections.
- *
- * Copyright: Copyright Digital Mars 2008 - 2012.
- * License: Distributed under the
- *      $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
- *    (See accompanying file LICENSE)
- * Authors:   Walter Bright, Sean Kelly, Martin Nowak
- * Source: $(DRUNTIMESRC src/rt/_sections_win64.d)
- */
+// Win64-specific support for sections.
+// Copyright (C) 2019 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 rt.sections_win64;
+module gcc.sections.win64;
 
 version (CRuntime_Microsoft):
 
@@ -271,7 +281,7 @@ struct IMAGE_NT_HEADERS
 
 struct IMAGE_SECTION_HEADER
 {
-    char[8] Name;
+    char[8] Name = 0;
     union {
         uint   PhysicalAddress;
         uint   VirtualSize;

libphobos/libdruntime/rt/bss_section.c

-/**
- * This module is used to detect copy relocated ModuleInfos (located in .bss section).
- *
- * Copyright: Copyright Martin Nowak 2014-.
- * License:   $(WEB www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
- * Authors:   Martin Nowak
- * Source: $(DRUNTIMESRC src/rt/_bss_section.c)
- */
-
-/* These symbols are defined in the linker script and bracket the
- * .bss, .lbss, .lrodata and .ldata sections.
- */
-#if defined(__linux__) || defined(__FreeBSD__) || defined(__NetBSD__)
-// Need to use weak linkage to workaround a bug in ld.bfd (Bugzilla 13025).
-extern int __attribute__((weak)) __bss_start, _end;
-
-__attribute__ ((visibility ("hidden"))) void* rt_get_bss_start();
-__attribute__ ((visibility ("hidden"))) void* rt_get_end();
-void* rt_get_bss_start() { return (void*)&__bss_start; }
-void* rt_get_end() { return (void*)&_end; }
-#endif

libphobos/libdruntime/rt/sections.d

@@ -8,6 +8,9 @@
  * Source: $(DRUNTIMESRC src/rt/_sections.d)
  */
 
+/* NOTE: This file has been patched from the original DMD distribution to
+ * work with the GDC compiler.
+ */
 module rt.sections;
 
 version (OSX)
@@ -19,7 +22,9 @@ else version (TVOS)
 else version (WatchOS)
     version = Darwin;
 
-version (CRuntime_Glibc)
+version (GNU)
+    public import gcc.sections;
+else version (CRuntime_Glibc)
     public import rt.sections_elf_shared;
 else version (FreeBSD)
     public import rt.sections_elf_shared;