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| author | J"orn Rennecke <amylaar@cygnus.co.uk> | 1999-10-14 02:18:10 +0000 |
|---|---|---|
| committer | Joern Rennecke <amylaar@gcc.gnu.org> | 1999-10-14 03:18:10 +0100 |
| commit | a59f86402f8ffb904e9dccb10568371a890e1f30 (patch) | |
| tree | 4156840afb1607ce49dc0ece52f2b961fbaa942f /gcc/expr.c | |
| parent | 5cf531a862a201c899afabde00e1cdc8b04cd9c9 (diff) | |
| download | gcc-a59f86402f8ffb904e9dccb10568371a890e1f30.zip gcc-a59f86402f8ffb904e9dccb10568371a890e1f30.tar.gz gcc-a59f86402f8ffb904e9dccb10568371a890e1f30.tar.bz2 | |
gcc toplevel:
* expr.c (store_constructor): Clear union if constructor is empty.
cp:
* typeck2.c (process_init_constructor): Handle empty constructors.
testsuite:
* g++.old-deja/g++.other/union2.C: New test.
From-SVN: r29956
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 9 |
1 files changed, 8 insertions, 1 deletions
@@ -4073,7 +4073,14 @@ store_constructor (exp, target, align, cleared) /* Inform later passes that the whole union value is dead. */ if (TREE_CODE (type) == UNION_TYPE || TREE_CODE (type) == QUAL_UNION_TYPE) - emit_insn (gen_rtx_CLOBBER (VOIDmode, target)); + { + emit_insn (gen_rtx_CLOBBER (VOIDmode, target)); + + /* If the constructor is empty, clear the union. */ + if (! CONSTRUCTOR_ELTS (exp) && ! cleared) + clear_storage (target, expr_size (exp), + TYPE_ALIGN (type) / BITS_PER_UNIT); + } /* If we are building a static constructor into a register, set the initial value as zero so we can fold the value into |