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https://bugs.gentoo.org/907474
From 87b95c17dc8611f9483b966d052eefc930f43927 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Mon, 5 Jun 2023 22:04:37 -0700
Subject: [PATCH] copy-file-range: support building for older kernels
* m4/copy-file-range.m4 (gl_FUNC_COPY_FILE_RANGE):
Remove static check, to support the dubious practice of
building for platforms that predate the build platform.
On working kernels this adds an extra syscall the first time
that copy_file_range is used. Problem reported for Gentoo by
Sam James <https://bugs.gnu.org/63850>.
--- a/m4/copy-file-range.m4
+++ b/m4/copy-file-range.m4
@@ -39,21 +39,9 @@ AC_DEFUN([gl_FUNC_COPY_FILE_RANGE],
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;;
+ # See copy-file-range.c comment re pre-5.3 Linux kernel bugs.
+ # We should be able to remove this hack in 2025.
+ REPLACE_COPY_FILE_RANGE=1;;
esac
fi
])
--- a/configure
+++ b/configure
@@ -39903,42 +39903,9 @@ printf "%s\n" "#define HAVE_COPY_FILE_RANGE 1" >>confdefs.h
case $host_os in
linux*)
- { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether copy_file_range is known to work" >&5
-printf %s "checking whether copy_file_range is known to work... " >&6; }
-if test ${gl_cv_copy_file_range_known_to_work+y}
-then :
- printf %s "(cached) " >&6
-else case e in #(
- e) cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h. */
-#include <linux/version.h>
-
-int
-main (void)
-{
-#if LINUX_VERSION_CODE < KERNEL_VERSION (5, 3, 0)
- #error "copy_file_range is buggy"
- #endif
-
- ;
- return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"
-then :
- gl_cv_copy_file_range_known_to_work=yes
-else case e in #(
- e) gl_cv_copy_file_range_known_to_work=no ;;
-esac
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext ;;
-esac
-fi
-{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $gl_cv_copy_file_range_known_to_work" >&5
-printf "%s\n" "$gl_cv_copy_file_range_known_to_work" >&6; }
- if test "$gl_cv_copy_file_range_known_to_work" = no; then
- REPLACE_COPY_FILE_RANGE=1
- fi;;
+ # See copy-file-range.c comment re pre-5.3 Linux kernel bugs.
+ # We should be able to remove this hack in 2025.
+ REPLACE_COPY_FILE_RANGE=1;;
esac
fi
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