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Add valgrind suppressions for python code.

Python's allocator does some low-level tricks for efficiency;unfortunately they trigger valgrind errors. Those tricks can be disabledmaking instrumentation easier; but few people testing postgres will havesuch a build of python. So add broad suppressions of the resultingerrors.See alsohttps://svn.python.org/projects/python/trunk/Misc/README.valgrindThis possibly will suppress valid errors, but without it it's basicallyimpossible to use valgrind with plpython code.Author: Andres FreundBackpatch: 9.4, where we started to maintain valgrind suppressions

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src/tools
- valgrind.supp

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`‎src/tools/valgrind.supp`

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`@@ -146,3 +146,69 @@`
`146`	`146`
`147`	`147`	`fun:IsBinaryCoercible`
`148`	`148`	`}`
	`149`	`+`
	`150`	`+`
	`151`	`+# Python's allocator does some low-level tricks for efficiency. Those`
	`152`	`+# can be disabled for better instrumentation; but few people testing`
	`153`	`+# postgres will have such a build of python. So add broad`
	`154`	`+# suppressions of the resulting errors.`
	`155`	`+# See also https://svn.python.org/projects/python/trunk/Misc/README.valgrind`
	`156`	`+{`
	`157`	`+ python_clever_allocator`
	`158`	`+ Memcheck:Addr4`
	`159`	`+ fun:PyObject_Free`
	`160`	`+}`
	`161`	`+`
	`162`	`+{`
	`163`	`+ python_clever_allocator`
	`164`	`+ Memcheck:Addr8`
	`165`	`+ fun:PyObject_Free`
	`166`	`+}`
	`167`	`+`
	`168`	`+{`
	`169`	`+ python_clever_allocator`
	`170`	`+ Memcheck:Value4`
	`171`	`+ fun:PyObject_Free`
	`172`	`+}`
	`173`	`+`
	`174`	`+{`
	`175`	`+ python_clever_allocator`
	`176`	`+ Memcheck:Value8`
	`177`	`+ fun:PyObject_Free`
	`178`	`+}`
	`179`	`+`
	`180`	`+{`
	`181`	`+ python_clever_allocator`
	`182`	`+ Memcheck:Cond`
	`183`	`+ fun:PyObject_Free`
	`184`	`+}`
	`185`	`+`
	`186`	`+{`
	`187`	`+ python_clever_allocator`
	`188`	`+ Memcheck:Addr4`
	`189`	`+ fun:PyObject_Realloc`
	`190`	`+}`
	`191`	`+`
	`192`	`+{`
	`193`	`+ python_clever_allocator`
	`194`	`+ Memcheck:Addr8`
	`195`	`+ fun:PyObject_Realloc`
	`196`	`+}`
	`197`	`+`
	`198`	`+{`
	`199`	`+ python_clever_allocator`
	`200`	`+ Memcheck:Value4`
	`201`	`+ fun:PyObject_Realloc`
	`202`	`+}`
	`203`	`+`
	`204`	`+{`
	`205`	`+ python_clever_allocator`
	`206`	`+ Memcheck:Value8`
	`207`	`+ fun:PyObject_Realloc`
	`208`	`+}`
	`209`	`+`
	`210`	`+{`
	`211`	`+ python_clever_allocator`
	`212`	`+ Memcheck:Cond`
	`213`	`+ fun:PyObject_Realloc`
	`214`	`+}`

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`‎src/tools/valgrind.supp`

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