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define _DEFAULT_SOURCE as well as _BSD_SOURCE for glibc version 2.20 and up 

in recent versions of feature_test_macros(7), it says of _BSD_SOURCE:

    Since glibc 2.20, this macro is deprecated.  It now has the same
    effect as defining _DEFAULT_SOURCE, but generates a compile-time
    warning   (unless   _DEFAULT_SOURCE   is   also  defined).   Use
    _DEFAULT_SOURCE  instead.    To   allow   code   that   requires
    _BSD_SOURCE  in  glibc  2.19  and earlier and _DEFAULT_SOURCE in
    glibc 2.20 and later to compile without  warnings,  define  both
    _BSD_SOURCE and _DEFAULT_SOURCE.
This commit is contained in:
Daniel Kahn Gillmor 2015-12-18 09:57:23 -05:00 committed by Sara Dickinson
parent ce1185166c
commit 4047bd09da
1 changed files with 1 additions and 1 deletions
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configure.ac
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@ -98,7 +98,7 @@ AX_CHECK_COMPILE_FLAG([-xc99],[CFLAGS="$CFLAGS -xc99"],[],[])
AX_CHECK_COMPILE_FLAG([-Wall],[CFLAGS="$CFLAGS -Wall"],[],[]) AX_CHECK_COMPILE_FLAG([-Wall],[CFLAGS="$CFLAGS -Wall"],[],[])
case "$host_os" in case "$host_os" in
linux* ) CFLAGS="$CFLAGS -D_BSD_SOURCE" linux* ) CFLAGS="$CFLAGS -D_BSD_SOURCE -D_DEFAULT_SOURCE"
;; ;;
solaris* ) CFLAGS="$CFLAGS -D__EXTENSIONS__" # for strdup() from <string.h> solaris* ) CFLAGS="$CFLAGS -D__EXTENSIONS__" # for strdup() from <string.h>
;; ;;