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strdup is not C99 #2008

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strdup is not C99 #2008

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10 changes: 10 additions & 0 deletions crypto/err/err.c
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,16 @@
* ([email protected]). This product includes software written by Tim
* Hudson ([email protected]). */

// `strdup` was only officially added in C23:
// * https://en.cppreference.com/w/c/string/byte/strdup
// The following macros are needed to ensure its definition
// is provided by the headers.
#ifdef __STDC_ALLOC_LIB__
#define __STDC_WANT_LIB_EXT2__ 1
#else
#define _POSIX_C_SOURCE 200809L
#endif

// Ensure we can't call OPENSSL_malloc circularly.
#define _BORINGSSL_PROHIBIT_OPENSSL_MALLOC
#include <openssl/err.h>
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