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author | Andy Wingo <wingo@pobox.com> | 2021-01-20 21:52:54 +0100 |
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committer | Andy Wingo <wingo@pobox.com> | 2021-01-20 23:03:56 +0100 |
commit | a91b95cca2d397c84f8b9bbd602d40209a7092ce (patch) | |
tree | 2c286a291f5a2b812d6e216be10936f2709d59cf /m4/pid_t.m4 | |
parent | 758b31994cff582c7e8785b4cc2240dbf3573837 (diff) | |
download | guile-a91b95cca2d397c84f8b9bbd602d40209a7092ce.tar.gz |
Update Gnulib to v0.1-4379-g2ef5a9b4b
Also bump required autoconf version to 2.64, as required by Gnulib.
Diffstat (limited to 'm4/pid_t.m4')
-rw-r--r-- | m4/pid_t.m4 | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/m4/pid_t.m4 b/m4/pid_t.m4 new file mode 100644 index 000000000..b7650a10f --- /dev/null +++ b/m4/pid_t.m4 @@ -0,0 +1,38 @@ +# pid_t.m4 serial 4 +dnl Copyright (C) 2020-2021 Free Software Foundation, Inc. +dnl This file is free software; the Free Software Foundation +dnl gives unlimited permission to copy and/or distribute it, +dnl with or without modifications, as long as this notice is preserved. + +# The following implementation works around a problem in autoconf <= 2.69. +m4_version_prereq([2.70], [], [ + +dnl Define pid_t if the headers don't define it. +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 + ]]) + ], + [gl_pid_type='int'], + [gl_pid_type='__int64']) + AC_DEFINE_UNQUOTED([pid_t], [$gl_pid_type], + [Define as a signed integer type capable of holding a process identifier.]) + ], + [AC_INCLUDES_DEFAULT]) +]) + +])# m4_version_prereq 2.70 |