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If a function has multiple format_arg attributes, clang only considers the first it finds (because AttributeLists are in reverse order, not necessarily the textually first) and ignores all others. Loop over all FormatArgAttr to print warnings for all declared format_arg attributes. For instance, libintl's ngettext (select plural or singular version of format string) has two __format_arg__ attributes. Differential Revision: https://reviews.llvm.org/D48734 llvm-svn: 336239
31 lines
855 B
C
31 lines
855 B
C
// RUN: %clang_cc1 -fsyntax-only -verify %s
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int printf(const char *, ...);
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const char* f(const char *s) __attribute__((format_arg(1)));
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const char *h(const char *msg1, const char *msg2)
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__attribute__((__format_arg__(1))) __attribute__((__format_arg__(2)));
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void g(const char *s) {
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printf("%d", 123);
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printf("%d %d", 123); // expected-warning{{more '%' conversions than data arguments}}
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printf(f("%d"), 123);
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printf(f("%d %d"), 123); // expected-warning{{more '%' conversions than data arguments}}
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printf(h(
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"", // expected-warning {{format string is empty}}
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"" // expected-warning {{format string is empty}}
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), 123);
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printf(h(
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"%d",
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"" // expected-warning {{format string is empty}}
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), 123);
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printf(h(
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"", // expected-warning {{format string is empty}}
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"%d"
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), 123);
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printf(h("%d", "%d"), 123);
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}
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