diff options
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/lseek.m4 | 32 |
1 files changed, 26 insertions, 6 deletions
diff --git a/m4/lseek.m4 b/m4/lseek.m4 index fd4f1f27d3..6e1ab6ffaa 100644 --- a/m4/lseek.m4 +++ b/m4/lseek.m4 @@ -1,4 +1,4 @@ -# lseek.m4 serial 12 +# lseek.m4 serial 13 dnl Copyright (C) 2007, 2009-2023 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -70,9 +70,29 @@ AC_DEFUN([gl_FUNC_LSEEK], REPLACE_LSEEK=1 fi - dnl macOS SEEK_DATA is incompatible with other platforms. - case $host_os in - darwin*) - REPLACE_LSEEK=1;; - esac + AS_IF([test $REPLACE_LSEEK = 0], + [AC_CACHE_CHECK([whether SEEK_DATA works but is incompatible with GNU], + [gl_cv_func_lseek_works_but_incompatible], + [AC_PREPROC_IFELSE( + [AC_LANG_SOURCE( + dnl Use macOS "9999" to stand for a future fixed macOS version. + dnl See ../lib/unistd.in.h and <https://bugs.gnu.org/61386>. + [[#include <unistd.h> + #if defined __APPLE__ && defined __MACH__ && defined SEEK_DATA + # ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ + # include <AvailabilityMacros.h> + # endif + # if 99990000 <= MAC_OS_X_VERSION_MIN_REQUIRED + # define LSEEK_WORKS_BUT_IS_INCOMPATIBLE_WITH_GNU + # endif + #endif + #ifndef LSEEK_WORKS_BUT_IS_INCOMPATIBLE_WITH_GNU + #error "No need to work around the bug" + #endif + ]])], + [gl_cv_func_lseek_works_but_incompatible=yes], + [gl_cv_func_lseek_works_but_incompatible=no])]) + if test "$gl_cv_func_lseek_works_but_incompatible" = yes; then + REPLACE_LSEEK=1 + fi]) ]) |