third_party/protobuf/m4/ac_system_extensions.m4 - Issue 1322483002: Revert https://codereview.chromium.org/1291903002 (protobuf roll).

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Issue 1322483002: Revert https://codereview.chromium.org/1291903002 (protobuf roll). (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master

Patch Set: Created 5 years, 3 months ago

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1 dnl Provide AC_USE_SYSTEM_EXTENSIONS for old autoconf machines.

2 AC_DEFUN([ACX_USE_SYSTEM_EXTENSIONS],[

3 ifdef([AC_USE_SYSTEM_EXTENSIONS],[

4 AC_USE_SYSTEM_EXTENSIONS

5 ],[

6 AC_BEFORE([$0], [AC_COMPILE_IFELSE])

7 AC_BEFORE([$0], [AC_RUN_IFELSE])

8

9 AC_REQUIRE([AC_GNU_SOURCE])

10 AC_REQUIRE([AC_AIX])

11 AC_REQUIRE([AC_MINIX])

12

13 AH_VERBATIM([__EXTENSIONS__],

14 [/* Enable extensions on Solaris. */

15 #ifndef __EXTENSIONS__

16 # undef __EXTENSIONS__

17 #endif

18 #ifndef _POSIX_PTHREAD_SEMANTICS

19 # undef _POSIX_PTHREAD_SEMANTICS

20 #endif

21 #ifndef _TANDEM_SOURCE

22 # undef _TANDEM_SOURCE

23 #endif])

24 AC_CACHE_CHECK([whether it is safe to define __EXTENSIONS__],

25 [ac_cv_safe_to_define___extensions__],

26 [AC_COMPILE_IFELSE(

27 [AC_LANG_PROGRAM([

28 # define __EXTENSIONS__ 1

29 AC_INCLUDES_DEFAULT])],

30 [ac_cv_safe_to_define___extensions__=yes],

31 [ac_cv_safe_to_define___extensions__=no])])

32 test $ac_cv_safe_to_define___extensions__ = yes &&

33 AC_DEFINE([__EXTENSIONS__])

34 AC_DEFINE([_POSIX_PTHREAD_SEMANTICS])

35 AC_DEFINE([_TANDEM_SOURCE])

36 ])

37 ])

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