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552c6c2328
Old GCC used to aggressively fold VLAs to constant-bound arrays at block scope in GNU mode. That's non-conforming, and more modern versions of GCC only do this at file scope. Update Clang to do the same. Also promote the warning for this from off-by-default to on-by-default in all cases; more recent versions of GCC likewise warn on this by default. This is still slightly more permissive than GCC, as pointed out in PR44406, as we still fold VLAs to constant arrays in structs, but that seems justifiable given that we don't support VLA-in-struct (and don't intend to ever support it), but GCC does. Differential Revision: https://reviews.llvm.org/D89523
26 lines
943 B
C
26 lines
943 B
C
// RUN: %clang_cc1 -fsyntax-only -Wno-pointer-to-int-cast -verify %s
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typedef long unsigned int __darwin_size_t;
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typedef long __darwin_ssize_t;
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typedef __darwin_size_t size_t;
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typedef __darwin_ssize_t ssize_t;
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struct cmsghdr {};
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#if 0
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This code below comes from the following system headers:
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sys/socket.h:#define CMSG_SPACE(l) (__DARWIN_ALIGN(sizeof(struct
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cmsghdr)) + __DARWIN_ALIGN(l))
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i386/_param.h:#define __DARWIN_ALIGN(p) ((__darwin_size_t)((char *)(p)
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+ __DARWIN_ALIGNBYTES) &~ __DARWIN_ALIGNBYTES)
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#endif
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ssize_t sendFileDescriptor(int fd, void *data, size_t nbytes, int sendfd) {
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union {
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// expected-warning@+1 {{folded to constant array}}
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char control[(((__darwin_size_t)((char *)(sizeof(struct cmsghdr)) + (sizeof(__darwin_size_t) - 1)) &~ (sizeof(__darwin_size_t) - 1)) + ((__darwin_size_t)((char *)(sizeof(int)) + (sizeof(__darwin_size_t) - 1)) &~ (sizeof(__darwin_size_t) - 1)))];
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} control_un;
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return 0;
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}
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