c1760eaf3b
To help detect common kinds of memory (and other resource) management bugs, GCC 11 adds support for the detection of mismatched calls to allocation and deallocation functions. At each call site to a known deallocation function GCC checks the set of allocation functions the former can be paired with and, if the two don't match, issues a -Wmismatched-dealloc warning (something similar happens in C++ for mismatched calls to new and delete). GCC also uses the same mechanism to detect attempts to deallocate objects not allocated by any allocation function (or pointers past the first byte into allocated objects) by -Wfree-nonheap-object. This support is enabled for built-in functions like malloc and free. To extend it beyond those, GCC extends attribute malloc to designate a deallocation function to which pointers returned from the allocation function may be passed to deallocate the allocated objects. Another, optional argument designates the positional argument to which the pointer must be passed. This change is the first step in enabling this extended support for Glibc.
43 lines
944 B
C
43 lines
944 B
C
#include <wchar.h>
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extern int fclose (FILE*);
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#if defined __GNUC__ && __GNUC__ >= 11
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/* Verify that calling fclose on the result of open_wmemstream doesn't
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trigger GCC -Wmismatched-dealloc with fclose forward-declared and
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without <stdio.h> included first (it is included later, in.
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"tst-memstream1.c"). */
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#pragma GCC diagnostic push
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#pragma GCC diagnostic error "-Wmismatched-dealloc"
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#endif
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int test_open_wmemstream_no_stdio (void)
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{
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{
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wchar_t *buf;
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size_t size;
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FILE *f = open_wmemstream (&buf, &size);
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fclose (f);
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}
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{
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FILE* (*pf)(wchar_t**, size_t*) = open_wmemstream;
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wchar_t *buf;
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size_t size;
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FILE *f = pf (&buf, &size);
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fclose (f);
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}
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return 0;
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}
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#if defined __GNUC__ && __GNUC__ >= 11
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/* Restore -Wmismatched-dealloc setting. */
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# pragma GCC diagnostic pop
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#endif
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#define CHAR_T wchar_t
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#define W(o) L##o
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#define OPEN_MEMSTREAM open_wmemstream
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#include "tst-memstream1.c"
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