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Since the wchar_t type depends on the architecture and the system we are
compiling for we replace the typedef to a fixed type by a typedef to a
define which is predefined by the compiler itself.
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ISO C2011 7.19 para 3 says "NULL, which expands to an implementation-defined null pointer constant"
ISO C2011 6.3.2.3 para 3 says "An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant."
So, it seems NULL can be defined either as "0" or as "(void *) 0". However, the two definitions are not equivalent in the context of a call to a variadic or unprototyped function: passing 0 when the function expects a pointer value can go wrong if sizeof(int) != sizeof(void *).
This commit changes the definition of NULL to the safer one:
This is what GCC and Clang do in C mode; they use "#define NULL 0" for C++ only.
Fixes issue #265
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As specified in ISO C99 section 7.16 and C11 section 7.18.
Fixes issue #266
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The definition is similar to that of gcc, however since we don't support
long doubles out of the box and long doubles are doubles in compat mode
we can directly define max_align_t to be long long.
Bug 23380
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This only means that there must be one identifier at the begining
and then a designator.
Bug 20765
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The c standard allows member designators for offsetof. The current
implementation works by recursively combining the offset of each
of the member designators. For array access the size of the
subtypes is multiplied by the index and for members the offset of
the member is calculated.
Bug 20765
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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
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The iso646 header defines some macros that expand to common
operators. Both clang and gcc ship with them and they are required
by the standard.
Bug 18645.
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CompCert now recognizes the C11 _Noreturn function specifier and
emits a simple warning for functions declared _Noreturn containing
a return statement. Also the stdnoreturn header and additionally
the stdalign header are added.
Bug 18541
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Gcc defines wint_t in the stddef header (even if it is not stanadard) and
additionally defines it if stddef is reincluded. The fix now defines it
before stddef is checked for reinclusion.
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Some newlib headers use the __extension__ keyword which suppresses
warnings for gcc extensions in strict mode. CompCert now ignores
this keyword for the gnu backends.
Also it seems that stddef of the gcc defines wint_t even though
it should not. However some libs rely on this. So wint_t is now
defined in CompCert's stddef header.
Bug 17613.
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typedefs in stdio, etc. for the diab compiler.
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header and set the __VA_LIST macro if it is not defined.
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This branch provides implementations of the following standard headers:
<float.h> <stdarg.h> <stdbool.h> <stddef.h> <varargs.h>
These are the headers that are provided by GCC and Clang, as opposed
to being provided by Glibc and similar C standard libraries.
Configuration flag "-no-standard-headers" deactivates the installation
and use of these headers.
Lightly tested so far (IA32 Linux).
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