d: Merge upstream dmd 313d28b3d, druntime e361d200.

D front-end changes:

    - Import latest bug fixes from the 2.100 release branch.
    - Fix signatures of extern C++ functions that have size_t
      parameters.

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 313d28b3d.
	* d-port.cc (Port::memicmp): Use d_size_t instead of size_t.
	(Port::valcpy): Likewise.

libphobos/ChangeLog:

	* libdruntime/MERGE: Merge upstream druntime e361d200.

6 files changed, 109 insertions, 30 deletions

diff --git a/gcc/d/dmd/MERGE b/gcc/d/dmd/MERGE
index 2bc9b95..d181191 100644
--- a/gcc/d/dmd/MERGE
+++ b/gcc/d/dmd/MERGE
@@ -1,4 +1,4 @@
-eb7bee331a13026eeb4dcbf9d43d5d4e744a4d26
+313d28b3db7523e67880ae3baf8ef28ce9abe9bd
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.
diff --git a/gcc/d/dmd/cparse.d b/gcc/d/dmd/cparse.d
index 53bf26e..2b2046f 100644
--- a/gcc/d/dmd/cparse.d
+++ b/gcc/d/dmd/cparse.d
@@ -213,16 +213,12 @@ final class CParser(AST) : Parser!AST
                     goto Lexp;
 
                 case TOK.leftParenthesis:
-                {
-                    /* If tokens look like a function call, assume it is one,
-                     * As any type-name won't be resolved until semantic, this
-                     * could be rewritten later.
-                     */
-                    auto tk = &token;
-                    if (isFunctionCall(tk))
-                        goto Lexp;
-                    goto default;
-                }
+                    if (auto pt = lookupTypedef(token.ident))
+                    {
+                        if (*pt)
+                            goto Ldeclaration;
+                    }
+                    goto Lexp;  // function call
 
                 default:
                 {
@@ -1626,10 +1622,21 @@ final class CParser(AST) : Parser!AST
          */
         if (token.value == TOK.semicolon)
         {
-            nextToken();
             if (!tspec)
+            {
+                nextToken();
                 return;         // accept empty declaration as an extension
+            }
+
+            if (auto ti = tspec.isTypeIdentifier())
+            {
+                // C11 6.7.2-2
+                error("type-specifier missing for declaration of `%s`", ti.ident.toChars());
+                nextToken();
+                return;
+            }
 
+            nextToken();
             auto tt = tspec.isTypeTag();
             if (!tt ||
                 !tt.id && (tt.tok == TOK.struct_ || tt.tok == TOK.union_))
@@ -1661,6 +1668,22 @@ final class CParser(AST) : Parser!AST
             specifier.mod &= ~MOD.xnone;          // 'used' it
         }
 
+        void scanPastSemicolon()
+        {
+            while (token.value != TOK.semicolon && token.value != TOK.endOfFile)
+                nextToken();
+            nextToken();
+        }
+
+        if (token.value == TOK.assign && tspec && tspec.isTypeIdentifier())
+        {
+            /* C11 6.7.2-2
+             * Special check for `const b = 1;` because some compilers allow it
+             */
+            error("type-specifier omitted for declaration of `%s`", tspec.isTypeIdentifier().ident.toChars());
+            return scanPastSemicolon();
+        }
+
         bool first = true;
         while (1)
         {
@@ -1880,10 +1903,7 @@ final class CParser(AST) : Parser!AST
                 default:
                     error("`=`, `;` or `,` expected to end declaration instead of `%s`", token.toChars());
                 Lend:
-                    while (token.value != TOK.semicolon && token.value != TOK.endOfFile)
-                        nextToken();
-                    nextToken();
-                    return;
+                    return scanPastSemicolon();
             }
         }
     }
@@ -2528,7 +2548,14 @@ final class CParser(AST) : Parser!AST
                 default:
                     if (declarator == DTR.xdirect)
                     {
-                        error("identifier or `(` expected"); // )
+                        if (!t || t.isTypeIdentifier())
+                        {
+                            // const arr[1];
+                            error("no type-specifier for declarator");
+                            t = AST.Type.tint32;
+                        }
+                        else
+                            error("identifier or `(` expected"); // )
                         panic();
                     }
                     ts = t;
@@ -2744,6 +2771,11 @@ final class CParser(AST) : Parser!AST
         Specifier specifier;
         specifier.packalign.setDefault();
         auto tspec = cparseSpecifierQualifierList(LVL.global, specifier);
+        if (!tspec)
+        {
+            error("type-specifier is missing");
+            tspec = AST.Type.tint32;
+        }
         if (tspec && specifier.mod & MOD.xconst)
         {
             tspec = toConst(tspec);
@@ -2829,8 +2861,18 @@ final class CParser(AST) : Parser!AST
             Specifier specifier;
             specifier.packalign.setDefault();
             auto tspec = cparseDeclarationSpecifiers(LVL.prototype, specifier);
-            if (tspec && specifier.mod & MOD.xconst)
+            if (!tspec)
             {
+                error("no type-specifier for parameter");
+                tspec = AST.Type.tint32;
+            }
+
+            if (specifier.mod & MOD.xconst)
+            {
+                if ((token.value == TOK.rightParenthesis || token.value == TOK.comma) &&
+                    tspec.isTypeIdentifier())
+                    error("type-specifier omitted for parameter `%s`", tspec.isTypeIdentifier().ident.toChars());
+
                 tspec = toConst(tspec);
                 specifier.mod = MOD.xnone;      // 'used' it
             }
@@ -3400,7 +3442,12 @@ final class CParser(AST) : Parser!AST
         Specifier specifier;
         specifier.packalign = this.packalign;
         auto tspec = cparseSpecifierQualifierList(LVL.member, specifier);
-        if (tspec && specifier.mod & MOD.xconst)
+        if (!tspec)
+        {
+            error("no type-specifier for struct member");
+            tspec = AST.Type.tint32;
+        }
+        if (specifier.mod & MOD.xconst)
         {
             tspec = toConst(tspec);
             specifier.mod = MOD.xnone;          // 'used' it
@@ -3413,7 +3460,13 @@ final class CParser(AST) : Parser!AST
             nextToken();
             auto tt = tspec.isTypeTag();
             if (!tt)
+            {
+                if (auto ti = tspec.isTypeIdentifier())
+                {
+                    error("type-specifier omitted before declaration of `%s`", ti.ident.toChars());
+                }
                 return; // legal but meaningless empty declaration
+            }
 
             /* If anonymous struct declaration
              *   struct { ... members ... };
@@ -3453,6 +3506,12 @@ final class CParser(AST) : Parser!AST
             AST.Type dt;
             if (token.value == TOK.colon)
             {
+                if (auto ti = tspec.isTypeIdentifier())
+                {
+                    error("type-specifier omitted before bit field declaration of `%s`", ti.ident.toChars());
+                    tspec = AST.Type.tint32;
+                }
+
                 // C11 6.7.2.1-12 unnamed bit-field
                 id = Identifier.generateAnonymousId("BitField");
                 dt = tspec;
diff --git a/gcc/d/dmd/dscope.d b/gcc/d/dmd/dscope.d
index c3a1d05..6339a9e 100644
--- a/gcc/d/dmd/dscope.d
+++ b/gcc/d/dmd/dscope.d
@@ -457,6 +457,8 @@ struct Scope
 
                 if (sc.scopesym.isModule())
                     flags |= SearchUnqualifiedModule;        // tell Module.search() that SearchLocalsOnly is to be obeyed
+                else if (sc.flags & SCOPE.Cfile && sc.scopesym.isStructDeclaration())
+                    continue;                                // C doesn't have struct scope
 
                 if (Dsymbol s = sc.scopesym.search(loc, ident, flags))
                 {
diff --git a/gcc/d/dmd/expression.h b/gcc/d/dmd/expression.h
index a0d63e0..330dcdb 100644
--- a/gcc/d/dmd/expression.h
+++ b/gcc/d/dmd/expression.h
@@ -373,11 +373,11 @@ public:
     OwnedBy ownedByCtfe;
 
     static StringExp *create(const Loc &loc, const char *s);
-    static StringExp *create(const Loc &loc, const void *s, size_t len);
+    static StringExp *create(const Loc &loc, const void *s, d_size_t len);
     static void emplace(UnionExp *pue, const Loc &loc, const char *s);
     bool equals(const RootObject *o) const;
-    char32_t getCodeUnit(size_t i) const;
-    void setCodeUnit(size_t i, char32_t c);
+    char32_t getCodeUnit(d_size_t i) const;
+    void setCodeUnit(d_size_t i, char32_t c);
     StringExp *toStringExp();
     StringExp *toUTF8(Scope *sc);
     Optional<bool> toBool();
diff --git a/gcc/d/dmd/expressionsem.d b/gcc/d/dmd/expressionsem.d
index 22a1f45..d4e96bb 100644
--- a/gcc/d/dmd/expressionsem.d
+++ b/gcc/d/dmd/expressionsem.d
@@ -5216,13 +5216,30 @@ private extern (C++) final class ExpressionSemanticVisitor : Visitor
         if (s.ident)
         {
             VarDeclaration v = s.isVarDeclaration();
-            if (v && !(sc.flags & SCOPE.Cfile))
+            if (v)
             {
-                /* Do semantic() on initializer first so this will be illegal:
-                 *      int a = a;
-                 */
-                e.declaration.dsymbolSemantic(sc);
-                s.parent = sc.parent;
+                if (sc.flags & SCOPE.Cfile)
+                {
+                    /* Do semantic() on the type before inserting v into the symbol table
+                     */
+                    if (!v.originalType)
+                        v.originalType = v.type.syntaxCopy();
+                    Scope* sc2 = sc.push();
+                    sc2.stc |= v.storage_class & STC.FUNCATTR;
+                    sc2.linkage = LINK.c;       // account for the extern(C) in front of the declaration
+                    v.inuse++;
+                    v.type = v.type.typeSemantic(v.loc, sc2);
+                    v.inuse--;
+                    sc2.pop();
+                }
+                else
+                {
+                    /* Do semantic() on initializer first so this will be illegal:
+                     *      int a = a;
+                     */
+                    e.declaration.dsymbolSemantic(sc);
+                    s.parent = sc.parent;
+                }
             }
 
             if (!sc.insert(s))
diff --git a/gcc/d/dmd/root/port.h b/gcc/d/dmd/root/port.h
index 069a365..66a6760 100644
--- a/gcc/d/dmd/root/port.h
+++ b/gcc/d/dmd/root/port.h
@@ -13,12 +13,13 @@
 // The idea is to minimize #ifdef's in the app code.
 
 #include "dsystem.h"
+#include "dcompat.h"
 
 typedef unsigned char utf8_t;
 
 struct Port
 {
-    static int memicmp(const char *s1, const char *s2, size_t n);
+    static int memicmp(const char *s1, const char *s2, d_size_t n);
     static char *strupr(char *s);
 
     static bool isFloat32LiteralOutOfRange(const char *s);
@@ -30,5 +31,5 @@ struct Port
     static unsigned readlongBE(const void *buffer);
     static unsigned readwordLE(const void *buffer);
     static unsigned readwordBE(const void *buffer);
-    static void valcpy(void *dst, uint64_t val, size_t size);
+    static void valcpy(void *dst, uint64_t val, d_size_t size);
 };