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Commit 5687e78

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Doc: improve commentary about providing our own definitions of M_PI.
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‎contrib/earthdistance/earthdistance.c

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#include "utils/geo_decls.h" /* for Point */
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/* X/Open (XSI) requires <math.h> to provide M_PI, but core POSIX does not */
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif

‎src/bin/pgbench/pgbench.c

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#include "port/pg_bitutils.h"
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#include "portability/instr_time.h"
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/* X/Open (XSI) requires <math.h> to provide M_PI, but core POSIX does not */
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif

‎src/include/utils/float.h

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#include <math.h>
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/* X/Open (XSI) requires <math.h> to provide M_PI, but core POSIX does not */
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#ifndef M_PI
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/* From my RH5.2 gcc math.h file - thomas 2000-04-03 */
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#define M_PI 3.14159265358979323846
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#endif
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