diff options
Diffstat (limited to 'gcc-4.9/gcc/varpool.c')
| -rw-r--r-- | gcc-4.9/gcc/varpool.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/gcc-4.9/gcc/varpool.c b/gcc-4.9/gcc/varpool.c index d9b9a1ad5..6b643973b 100644 --- a/gcc-4.9/gcc/varpool.c +++ b/gcc-4.9/gcc/varpool.c @@ -335,8 +335,16 @@ ctor_for_folding (tree decl) /* Variables declared 'const' without an initializer have zero as the initializer if they may not be - overridden at link or run time. */ - if (!DECL_INITIAL (real_decl) + overridden at link or run time. + + It is actually requirement for C++ compiler to optimize const variables + consistently. As a GNU extension, do not enfore this rule for user defined + weak variables, so we support interposition on: + static const int dummy = 0; + extern const int foo __attribute__((__weak__, __alias__("dummy"))); + */ + if ((!DECL_INITIAL (real_decl) + || (DECL_WEAK (decl) && !DECL_COMDAT (decl))) && (DECL_EXTERNAL (decl) || decl_replaceable_p (decl))) return error_mark_node; |