gcc: Backport patch for PR 87137

mingw-w64-gcc/0021-Backport-patch-for-pr87137.patch

@@ -0,0 +1,31 @@
+--- a/gcc/stor-layout.c	2018/04/25 07:39:32	259630
++++ b/gcc/stor-layout.c	2018/09/05 10:42:59	264123
+@@ -1685,14 +1685,21 @@
+     {
+       rli->bitpos = size_binop (PLUS_EXPR, rli->bitpos, DECL_SIZE (field));
+ 
+-      /* If we ended a bitfield before the full length of the type then
+-	 pad the struct out to the full length of the last type.  */
+-      if ((DECL_CHAIN (field) == NULL
+-	   || TREE_CODE (DECL_CHAIN (field)) != FIELD_DECL)
+-	  && DECL_BIT_FIELD_TYPE (field)
++      /* If FIELD is the last field and doesn't end at the full length
++	 of the type then pad the struct out to the full length of the
++	 last type.  */
++      if (DECL_BIT_FIELD_TYPE (field)
+ 	  && !integer_zerop (DECL_SIZE (field)))
+-	rli->bitpos = size_binop (PLUS_EXPR, rli->bitpos,
+-				  bitsize_int (rli->remaining_in_alignment));
++	{
++	  /* We have to scan, because non-field DECLS are also here.  */
++	  tree probe = field;
++	  while ((probe = DECL_CHAIN (probe)))
++	    if (TREE_CODE (probe) == FIELD_DECL)
++	      break;
++	  if (!probe)
++	    rli->bitpos = size_binop (PLUS_EXPR, rli->bitpos,
++				      bitsize_int (rli->remaining_in_alignment));
++	}
+ 
+       normalize_rli (rli);
+     }

mingw-w64-gcc/PKGBUILD

@@ -49,10 +49,11 @@ source=("https://ftp.gnu.org/gnu/gcc/${_realname}-${pkgver}/${_realname}-${pkgve
         0011-Enable-shared-gnat-implib.patch
         0014-clone_function_name_1-Retain-any-stdcall-suffix.patch
         0019-gcc-8.2.0-Backport-patches-for-std-filesystem-from-master.patch
+        0020-gcc-8.2.0-Backport-patches-for-std-variant-_M_destructive_move.patch
+        0021-Backport-patch-for-pr87137.patch
         0130-libstdc++-in-out.patch
         0140-gcc-8.2.0-diagnostic-color.patch
-        0300-ada-tools-build.patch
-        0020-gcc-8.2.0-Backport-patches-for-std-variant-_M_destructive_move.patch)
+        0300-ada-tools-build.patch)
 sha256sums=('196c3c04ba2613f893283977e6011b2345d1cd1af9abeac58e916b1aab3e0080'
             'SKIP'
             'dea2bbad4967280910559c6a11b865aeec19cab34647fb5894cb498b24b14462'
@@ -68,10 +69,11 @@ sha256sums=('196c3c04ba2613f893283977e6011b2345d1cd1af9abeac58e916b1aab3e0080'
             '8faff8e503a617f283270f411399a8bcacda3ab62b4072dedf117e108af4844a'
             '60a58ed41389691a68ef4b7d47a0328df4d28d26e6c680a6b06b31191481ca65'
             '1a2309d027c3defd0257f50a3c82fa8d2b5ea825c9d880ed77ea8e43505112b2'
+            '7999073ba0827b1d61b3d60fed9efcf2f8f250997b9fcc865184f1c2fe2083dc'
+            '57b1a870ed5ac0b067f6b1dd114abe9f26dc28e1374fd0391da5683534b5c3ca'
             'ba2f77db605577d08e4079f08a7a9556c975b5416be8610c5be31e915637feb7'
             'e467f0ac68b349de826c79b00a45c5ad9e7c5a55d06b9b9fa7afd94c597f6376'
-            'ecf58edd60509a1d0ba554ff4824c999fb22b449ea3649790588c1377e80f10b'
-            '7999073ba0827b1d61b3d60fed9efcf2f8f250997b9fcc865184f1c2fe2083dc')
+            'ecf58edd60509a1d0ba554ff4824c999fb22b449ea3649790588c1377e80f10b')
 
 _threads="posix"
 
@@ -115,7 +117,8 @@ prepare() {
     0011-Enable-shared-gnat-implib.patch \
     0014-clone_function_name_1-Retain-any-stdcall-suffix.patch \
     0019-gcc-8.2.0-Backport-patches-for-std-filesystem-from-master.patch \
-    0020-gcc-8.2.0-Backport-patches-for-std-variant-_M_destructive_move.patch
+    0020-gcc-8.2.0-Backport-patches-for-std-variant-_M_destructive_move.patch \
+    0021-Backport-patch-for-pr87137.patch
 
   apply_patch_with_msg \
     0130-libstdc++-in-out.patch