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bpo-31374: undef _POSIX_C_SOURCE in expat_config.h #3601

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bpo-31374: undef _POSIX_C_SOURCE in expat_config.h #3601

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9 changes: 9 additions & 0 deletions Modules/expat/expat_config.h
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,16 @@
#ifndef EXPAT_CONFIG_H
#define EXPAT_CONFIG_H

/* bpo-31374: Expat defines _POSIX_C_SOURCE before including expat_config.h,
but pyconfig.h redefines _POSIX_C_SOURCE on some platforms. Unset it to
prevent a compiler warning. */
#ifdef _POSIX_C_SOURCE
# undef _POSIX_C_SOURCE
#endif

/* Get WORDS_BIGENDIAN and HAVE_MEMMOVE defines from pyconfig.h */
#include <pyconfig.h>

#ifdef WORDS_BIGENDIAN
#define BYTEORDER 4321
#else
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