[Bug c/36987] New: Truncated C struct data initializer with variable size trailing array

[howard dot thomson at dial dot pipex dot com]

An initializer for a C struct with a variable sized last component is accepted,
but the data generated excludes the variable sized component.

struct s {
   int16_t a,b,c,d;
   int16_t y[];
} data = {0,0,0,0, {2,3,4,5}};

results in only the leading four int16_t values in the data segment.

Either the initializer data should be emitted, or the initializer should be
rejected with an error, or the struct declaration should be rejected with an
error, and presumably the first option would be preferable.


-- 
   Summary: Truncated C struct data initializer with variable size
trailing array
   Product: gcc
   Version: 4.0.1
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: howard dot thomson at dial dot pipex dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36987

[Bug c/36987] Truncated C struct data initializer with variable size trailing array

[howard dot thomson at dial dot pipex dot com]

--- Comment #1 from howard dot thomson at dial dot pipex dot com  
2008-07-31 12:50 ---
Created an attachment (id=15985)
 -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=15985action=view)
test for unexpected C struct field alteration

Due to the variable sized component of the struct initializer not being
emitted, assignment to the single element of that initializer results in the
following data structure being unexpectedly altered.

gcc is 4.0.1 (Apple Computer, Inc. build 5449) on an X86_64 OpenSUSE 10.3
system.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36987

[Bug middle-end/36987] Truncated C struct data initializer with variable size trailing array

[howard dot thomson at dial dot pipex dot com]

--- Comment #4 from howard dot thomson at dial dot pipex dot com  
2008-07-31 19:53 ---
OK Thanks to all.

I did look for previous reports, honest!


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36987