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| author | cypherpunks <cypherpunks@torproject.org> | 2016-06-17 13:43:25 +0000 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2016-06-17 10:17:44 -0400 |
| commit | 94762e37b950f3ce1696c78dd4f7a89b6d05f1ac (patch) | |
| tree | e9b3517710fc601d2e7cac22d0620498cc145a0c /m4 | |
| parent | 9a63f059b9eefa910a8c74b4936623dd37e946dd (diff) | |
| download | tor-94762e37b950f3ce1696c78dd4f7a89b6d05f1ac.tar.gz tor-94762e37b950f3ce1696c78dd4f7a89b6d05f1ac.zip | |
Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS
The Autoconf macro AC_USE_SYSTEM_EXTENSIONS defines preprocessor macros
which turn on extensions to C and POSIX. The macro also makes it easier
for developers to use the extensions without needing (or forgetting) to
define them manually.
The macro can be safely used because it was introduced in Autoconf 2.60
and Tor requires Autoconf 2.63 and above.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/pc_from_ucontext.m4 | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/m4/pc_from_ucontext.m4 b/m4/pc_from_ucontext.m4 index 6bedcbb2da..8a9dc459e6 100644 --- a/m4/pc_from_ucontext.m4 +++ b/m4/pc_from_ucontext.m4 @@ -79,24 +79,21 @@ AC_DEFUN([AC_PC_FROM_UCONTEXT], if ! $pc_field_found; then # Prefer sys/ucontext.h to ucontext.h, for OS X's sake. if test "x$ac_cv_header_cygwin_signal_h" = xyes; then - AC_TRY_COMPILE([#define _GNU_SOURCE 1 - #include <cygwin/signal.h>], + AC_TRY_COMPILE([#include <cygwin/signal.h>], [ucontext_t u; return u.$pc_field == 0;], AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field, How to access the PC from a struct ucontext) AC_MSG_RESULT([$pc_field]) pc_field_found=true) elif test "x$ac_cv_header_sys_ucontext_h" = xyes; then - AC_TRY_COMPILE([#define _GNU_SOURCE 1 - #include <sys/ucontext.h>], + AC_TRY_COMPILE([#include <sys/ucontext.h>], [ucontext_t u; return u.$pc_field == 0;], AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field, How to access the PC from a struct ucontext) AC_MSG_RESULT([$pc_field]) pc_field_found=true) elif test "x$ac_cv_header_ucontext_h" = xyes; then - AC_TRY_COMPILE([#define _GNU_SOURCE 1 - #include <ucontext.h>], + AC_TRY_COMPILE([#include <ucontext.h>], [ucontext_t u; return u.$pc_field == 0;], AC_DEFINE_UNQUOTED(PC_FROM_UCONTEXT, $pc_field, How to access the PC from a struct ucontext) |