[LLVMbugs] [Bug 14037] New: #pragma pack in nested struct rejected, and with poor diagnostics

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14037

             Bug #: 14037
           Summary: #pragma pack in nested struct rejected, and with poor
                    diagnostics
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: matti.niemenmaa+llvmbugs at iki.fi
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


clang 3.1 as well as the latest trunk version rejects the following:


struct s {
#pragma pack(push)
#pragma pack(1)
   struct { char x; int y; } nested;
#pragma pack(pop)
};
int f(struct s *p) { return p->nested.x + p->nested.y; }


(The f function is there just to check from the asm that the struct is
correctly packed.)

The output from clang consists of the following fairly unhelpful errors:


$ clang -S asdf.c
asdf.c:2:9: error: type name requires a specifier or qualifier
#pragma pack(push)
        ^
asdf.c:2:9: error: expected member name or ';' after declaration specifiers
#pragma pack(push)
        ^~~~
asdf.c:1:11: error: expected ';' at end of declaration list
struct s {
          ^
          ;
asdf.c:5:9: error: type name requires a specifier or qualifier
#pragma pack(pop)
        ^
asdf.c:5:9: error: expected member name or ';' after declaration specifiers
#pragma pack(pop)
        ^~~~
asdf.c:4:37: error: expected ';' at end of declaration list
   struct { char x; int y; } nested;
                                    ^
                                    ;
asdf.c:7:32: error: no member named 'nested' in 'struct s'
int f(struct s *p) { return p->nested.x + p->nested.y; }
                            ~  ^
asdf.c:7:46: error: no member named 'nested' in 'struct s'
int f(struct s *p) { return p->nested.x + p->nested.y; }
                                          ~  ^
8 errors generated.


If the #pragmas are placed outside the top-level struct, clang compiles the
file without error. GCC 4.7.1 accepts both versions of the code.

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