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| author | Paul Eggert <eggert@cs.ucla.edu> | 2022-02-23 11:11:52 -0800 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2022-02-23 11:41:02 -0800 |
| commit | 308e63ccfcc6a6b1285bb17eff641f48639fb329 (patch) | |
| tree | e3f1daf0bdfb7180fc1f007280fa2a4ee43c259c /m4/copy-file-range.m4 | |
| parent | 995aed477dc9be708920cc46442673126ed75760 (diff) | |
| download | emacs-308e63ccfcc6a6b1285bb17eff641f48639fb329.tar.gz emacs-308e63ccfcc6a6b1285bb17eff641f48639fb329.tar.bz2 emacs-308e63ccfcc6a6b1285bb17eff641f48639fb329.zip | |
Update from Gnulib by running admin/merge-gnulib
Diffstat (limited to 'm4/copy-file-range.m4')
| -rw-r--r-- | m4/copy-file-range.m4 | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/m4/copy-file-range.m4 b/m4/copy-file-range.m4 index 4c7ec4eaafa..1b8b9d88589 100644 --- a/m4/copy-file-range.m4 +++ b/m4/copy-file-range.m4 @@ -7,6 +7,7 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_COPY_FILE_RANGE], [ AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl Persuade glibc <unistd.h> to declare copy_file_range. AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) @@ -21,7 +22,7 @@ AC_DEFUN([gl_FUNC_COPY_FILE_RANGE], [AC_LANG_PROGRAM( [[#include <unistd.h> ]], - [[ssize_t (*func) (int, off_t *, int, off_t, size_t, unsigned) + [[ssize_t (*func) (int, off_t *, int, off_t *, size_t, unsigned) = copy_file_range; return func (0, 0, 0, 0, 0, 0) & 127; ]]) @@ -32,5 +33,27 @@ AC_DEFUN([gl_FUNC_COPY_FILE_RANGE], if test "$gl_cv_func_copy_file_range" != yes; then HAVE_COPY_FILE_RANGE=0 + else + AC_DEFINE([HAVE_COPY_FILE_RANGE], 1, + [Define to 1 if the function copy_file_range exists.]) + + case $host_os in + linux*) + AC_CACHE_CHECK([whether copy_file_range is known to work], + [gl_cv_copy_file_range_known_to_work], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <linux/version.h> + ]], + [[#if LINUX_VERSION_CODE < KERNEL_VERSION (5, 3, 0) + #error "copy_file_range is buggy" + #endif + ]])], + [gl_cv_copy_file_range_known_to_work=yes], + [gl_cv_copy_file_range_known_to_work=no])]) + if test "$gl_cv_copy_file_range_known_to_work" = no; then + REPLACE_COPY_FILE_RANGE=1 + fi;; + esac fi ]) |