Merge bitcoin/bitcoin#27656: build, doc: Adjust comment after PR27254

3ece0ebf62 build, doc: Adjust comment after PR27254 (Hennadii Stepanov)

Pull request description:

  This is a follow up for https://github.com/bitcoin/bitcoin/pull/27254.

ACKs for top commit:
  TheCharlatan:
    ACK 3ece0ebf62

Tree-SHA512: 36c627524304f0ea964383488acb9b16d0b553cc9cf3bce7a12aec65a7905b13e4582b7b7ec6d1efa32cd3c623969bc00f805ff31d9e6eec86a614e75796c8ff
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fanquake 2023-05-15 11:17:51 +01:00
commit b2c85bd82f
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@ -1075,7 +1075,7 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <malloc.h>]],
dnl Check for posix_fallocate
AC_MSG_CHECKING([for posix_fallocate])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
// same as in src/util/system.cpp
// same as in src/util/fs_helpers.cpp
#ifdef __linux__
#ifdef _POSIX_C_SOURCE
#undef _POSIX_C_SOURCE