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| author | Bernhard Schommer <bernhardschommer@gmail.com> | 2017-01-20 10:55:26 +0100 |
|---|---|---|
| committer | Bernhard Schommer <bernhardschommer@gmail.com> | 2017-01-20 10:55:26 +0100 |
| commit | 55937c177f90ecf0dea40c318d2f8d52fa69b55d (patch) | |
| tree | 493a207959cd64f6b3419dc109d246df35b01e54 /runtime/include | |
| parent | efaf1cf1c47370ab23db190fc4c2c1f3ad05323e (diff) | |
| download | compcert-kvx-55937c177f90ecf0dea40c318d2f8d52fa69b55d.tar.gz compcert-kvx-55937c177f90ecf0dea40c318d2f8d52fa69b55d.zip | |
Implement offsetof via builtin.
The implementation of offsetof as macro in the form
((size_t) &((ty*) NULL)->member) has the problem that it cannot be
used everywhere were an integer constant expression is allowed,
for example in initiliazers of global variables and there is also
no check for the case that member is of bitifield type.
The new implementation adds a builtin function for this which is
replaced by an integer constant during elaboration.
Bug 20765
Diffstat (limited to 'runtime/include')
| -rw-r--r-- | runtime/include/stddef.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/runtime/include/stddef.h b/runtime/include/stddef.h index 5bdff564..452497c3 100644 --- a/runtime/include/stddef.h +++ b/runtime/include/stddef.h @@ -114,7 +114,7 @@ typedef signed int wchar_t; #endif #if defined(_STDDEF_H) && !defined(offsetof) -#define offsetof(ty,member) ((size_t) &((ty*) NULL)->member) +#define offsetof(ty,member) (__builtin_offsetof(ty,member)) #endif #endif |