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build: Do not rely on internal autoconf ac_cv_sys_file_offset_bits variable

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This is an internal implementation detail from AC_SYS_LARGEFILE, which
happened to change with autoconf 2.72. Instead compute our own size
for off_t.

Closes: #28
This commit is contained in:
Guillem Jover 2024-03-14 01:56:36 +01:00
parent 149aafe198
commit 2a3d521318
1 changed files with 11 additions and 1 deletions
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12
m4/libbsd-large.m4
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@ -43,7 +43,17 @@ AC_DEFUN([LIBBSD_SYS_TIME64], [
])
LIBBSD_SELECT_ABI([time64], [explicit time64 time_t support])
AS_IF([test $ac_cv_sys_file_offset_bits -eq 64 && \
AC_CHECK_SIZEOF([off_t], [], [[
#define _FILE_OFFSET_BITS 64
#include <sys/types.h>
]])
AS_IF([test $ac_cv_sizeof_off_t = 8], [
libbsd_sys_has_lfs=1
], [
libbsd_sys_has_lfs=0
])
AS_IF([test $libbsd_sys_has_lfs -eq 1 && \
test $libbsd_sys_time_bits -eq 32 && \
test $ac_cv_sizeof_time_t -eq 8], [
AC_DEFINE([_TIME_BITS], [64], [Enable 64-bit time_t support])