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AC_TYPE_PID_T: Define pid_t correctly on 64-bit native Windows.

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Reported at <https://savannah.gnu.org/support/index.php?110296>.

* lib/autoconf/types.m4 (AC_TYPE_PID_T): Define pid_t to '__int64' on 64-bit
native Windows, and to 'int' otherwise.
This commit is contained in:
Bruno Haible 2020-08-24 01:38:14 +02:00 committed by Paul Eggert
parent 9b5c0f1774
commit da4c468de9
1 changed files with 26 additions and 1 deletions
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27
lib/autoconf/types.m4
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@ -610,7 +610,32 @@ AN_IDENTIFIER([ssize_t], [AC_TYPE_SSIZE_T])
AC_DEFUN([AC_TYPE_SSIZE_T], [AC_CHECK_TYPE(ssize_t, int)])
AN_IDENTIFIER([pid_t], [AC_TYPE_PID_T])
AC_DEFUN([AC_TYPE_PID_T], [AC_CHECK_TYPE(pid_t, int)])
AC_DEFUN([AC_TYPE_PID_T],
[
AC_CHECK_TYPE([pid_t],
[],
[dnl On 64-bit native Windows, define it to the equivalent of 'intptr_t'
dnl (= 'long long' = '__int64'), because that is the return type
dnl of the _spawnv* functions
dnl <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/spawnvp-wspawnvp>
dnl and the argument type of the _cwait function
dnl <https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/cwait>.
dnl Otherwise (on 32-bit Windows and on old Unix platforms), define it
dnl to 'int'.
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[
#if defined _WIN64 && !defined __CYGWIN__
LLP64
#endif
]])
],
[ac_pid_type='int'],
[ac_pid_type='__int64'])
AC_DEFINE_UNQUOTED([pid_t], [$ac_pid_type],
[Define as a signed integer type capable of holding a process identifier.])
],
[AC_INCLUDES_DEFAULT])
])
AN_IDENTIFIER([off_t], [AC_TYPE_OFF_T])
AC_DEFUN([AC_TYPE_OFF_T], [AC_CHECK_TYPE(off_t, long int)])