GNU logs - #78377, boring messages

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Subject: bug#78377: Cross-Compile - "src/make-prime-list: cannot execute: required file not found"
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It'd be nice to be able to cross-compile coreutils.

It could be done by detecting if `--host=` is different from the build system.
If it is different, then make the `src/primes.h` target natively
(specifically the `src/make-prime-list` target).

I noticed it was a very old issue (going back to 2012).
My workaround was just to `configure` without any arguments, `make
src/primes.h`, then `configure` again for cross-compiling, and run a
normal `make`.

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Subject: bug#78377: Acknowledgement (Cross-Compile - "src/make-prime-list:
 cannot execute: required file not found")
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Subject: bug#78377: Cross-Compile - "src/make-prime-list: cannot execute: required file not found"
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forcemerge 12741 78377
stop

On 11/05/2025 16:26, NR wrote:
> It'd be nice to be able to cross-compile coreutils.
> 
> It could be done by detecting if `--host=` is different from the build system.
> If it is different, then make the `src/primes.h` target natively
> (specifically the `src/make-prime-list` target).
> 
> I noticed it was a very old issue (going back to 2012).
> My workaround was just to `configure` without any arguments, `make
> src/primes.h`, then `configure` again for cross-compiling, and run a
> normal `make`.

Yes this was discussed at https://bugs.gnu.org/12741

The workaround isn't too onerous,
but yes it would be good to clean this up.

cheers,
Pádraig

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Subject: bug#78377: Cross-Compile - "src/make-prime-list: cannot execute: required file not found"
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P=C3=A1draig Brady <P@HIDDEN> writes:

> The workaround isn't too onerous,
> but yes it would be good to clean this up.

Doesn't crc32 in Gnulib handle this using $(BUILD_CC)? I imagine it
should be simple to do the same here. I can have a look later.

Collin

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On 2025-05-13 10:01, Collin Funk wrote:
> Doesn't crc32 in Gnulib handle this using $(BUILD_CC)? I imagine it
> should be simple to do the same here. I can have a look later.

Yes, that should work, so long as the build host isn't a Microsoft 
Windows platform that would require $(BUILD_EXEEXT). And that should be 
good enough; we don't need the full power of AX_PROG_CC_FOR_BUILD from 
the Autoconf Archive.

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Content-Type: text/plain

Hi Paul,

Paul Eggert <eggert@HIDDEN> writes:

> Yes, that should work, so long as the build host isn't a Microsoft
> Windows platform that would require $(BUILD_EXEEXT). And that should
> be good enough; we don't need the full power of AX_PROG_CC_FOR_BUILD
> from the Autoconf Archive.

Here is a patch that worked in an x86 docker container with an arm64
cross compiler.

Can we just assume that crc will always be used and depend on
build-cc.m4? I guess the more robust way to do things is to do the
following in bootstrap.conf:

    bootstrap_post_import_hook ()
    {
      $gnulib_tool --copy-file m4/build-cc.m4
    }

Like we do for tests/init.sh.

Collin


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-build-allow-make-prime-list-to-build-when-cross-comp.patch

From 9dab53ad3f15e0482020253f3f87f7be03748d53 Mon Sep 17 00:00:00 2001
From: Collin Funk <collin.funk1@HIDDEN>
Date: Thu, 15 May 2025 22:02:26 -0700
Subject: [PATCH] build: allow make-prime-list to build when cross-compiling

* src/local.mk: Compile the make-prime-list in a temporary directory
using $(BUILD_CC) so it can be run even when $(CC) is a cross-compiler.
Add some comments.
(noinst_PROGRAMS): Remove src/make-prime-list.
(src_make_prime_list_LDADD): Remove variable.
* src/make-prime-list.c: Don't include config.h and attributes.h.
Remove unnecessary #undefs
(ATTRIBUTE_CONST, ATTRIBUTE_MALLOC): Define for the host compiler.
---
 src/local.mk          | 33 ++++++++++++++++++---------------
 src/make-prime-list.c | 22 ++++++++++++++--------
 2 files changed, 32 insertions(+), 23 deletions(-)

diff --git a/src/local.mk b/src/local.mk
index fd9dc81c2..833c714e1 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -36,8 +36,7 @@ pkglibexec_PROGRAMS = @pkglibexec_PROGRAMS@
 
 # Needed by the testsuite.
 noinst_PROGRAMS =		\
-  src/getlimits			\
-  src/make-prime-list
+  src/getlimits
 
 noinst_HEADERS =		\
   src/chown.h			\
@@ -150,11 +149,6 @@ src_ln_LDADD = $(LDADD)
 src_logname_LDADD = $(LDADD)
 src_ls_LDADD = $(LDADD)
 
-# This must *not* depend on anything in lib/, since it is used to generate
-# src/primes.h.  If it depended on libcoreutils.a, that would pull all lib/*.c
-# into BUILT_SOURCES.
-src_make_prime_list_LDADD =
-
 src_md5sum_LDADD = $(LDADD)
 src_mkdir_LDADD = $(LDADD)
 src_mkfifo_LDADD = $(LDADD)
@@ -556,15 +550,24 @@ $(top_srcdir)/src/dircolors.h: src/dcgen src/dircolors.hin
 # and it needs to be built on a widest-known-int architecture, so it's
 # built only if absent.  It is not cleaned because we don't want to
 # insist that maintainers must build on hosts that support the widest
-# known ints (currently 128-bit).
+# known ints (currently 128-bit).  It is built in a temporary directory
+# to avoid Gnulib and allow cross-compilers.  The BUILD_* definitions
+# come from Gnulib's gl_BUILD_CC which is invoked for the crc module.
 BUILT_SOURCES += $(top_srcdir)/src/primes.h
-$(top_srcdir)/src/primes.h:
-	$(AM_V_at)${MKDIR_P} src
-	$(MAKE) src/make-prime-list$(EXEEXT)
-	$(AM_V_GEN)rm -f $@ $@-t
-	$(AM_V_at)src/make-prime-list$(EXEEXT) 5000 > $@-t
-	$(AM_V_at)chmod a-w $@-t
-	$(AM_V_at)mv $@-t $@
+$(top_srcdir)/src/primes.h: $(top_srcdir)/src/make-prime-list.c
+	$(AM_V_GEN)if test -n '$(BUILD_CC)'; then \
+	  $(MKDIR_P) $(top_srcdir)/src/primes-tmp \
+	  && (cd $(top_srcdir)/src/primes-tmp \
+	      && $(BUILD_CC) $(BUILD_CPPFLAGS) $(BUILD_CFLAGS) \
+	        $(BUILD_LDFLAGS) -o make-prime-list$(EXEEXT) \
+	        $(abs_top_srcdir)/src/make-prime-list.c) \
+	  && rm -f $@ $@-t \
+	  && $(top_srcdir)/src/primes-tmp/make-prime-list$(EXEEXT) \
+	    5000 > $@-t \
+	  && chmod a-w $@-t \
+	  && mv $@-t $@ \
+	  && rm -rf $(top_srcdir)/src/primes-tmp; \
+	fi
 
 # false exits nonzero even with --help or --version.
 # test doesn't support --help or --version.
diff --git a/src/make-prime-list.c b/src/make-prime-list.c
index 35cf3627c..1b4c50f34 100644
--- a/src/make-prime-list.c
+++ b/src/make-prime-list.c
@@ -17,9 +17,6 @@ PARTICULAR PURPOSE.  See the GNU General Public License for more details.
 You should have received a copy of the GNU General Public License along with
 this program.  If not, see https://www.gnu.org/licenses/.  */
 
-#include <config.h>
-
-#include <attribute.h>
 #include <inttypes.h>
 
 #include <limits.h>
@@ -29,11 +26,20 @@ this program.  If not, see https://www.gnu.org/licenses/.  */
 #include <stdlib.h>
 #include <errno.h>
 
-/* Deactivate "rpl_"-prefixed definitions of these symbols.  */
-#undef fclose
-#undef free
-#undef malloc
-#undef strerror
+/* This program is compiled in a separate directory to avoid linking to Gnulib
+   which may be cross-compiled.  Therefore, we also do not have config.h and
+   attribute.h.  Just define what we need.  */
+#if 2 < __GNUC__ + (95 <= __GNUC_MINOR__)
+# define ATTRIBUTE_CONST __attribute__ ((__const__))
+#else
+# define ATTRIBUTE_CONST
+#endif
+#if 3 < __GNUC__
+# define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
+#else
+# define ATTRIBUTE_MALLOC
+#endif
+
 
 /* An unsigned type that is no narrower than 32 bits and no narrower
    than unsigned int.  It's best to make it as wide as possible.
-- 
2.49.0


--=-=-=--

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On 16/05/2025 06:36, Collin Funk wrote:
> Hi Paul,
> 
> Paul Eggert <eggert@HIDDEN> writes:
> 
>> Yes, that should work, so long as the build host isn't a Microsoft
>> Windows platform that would require $(BUILD_EXEEXT). And that should
>> be good enough; we don't need the full power of AX_PROG_CC_FOR_BUILD
>> from the Autoconf Archive.
> 
> Here is a patch that worked in an x86 docker container with an arm64
> cross compiler.
> 
> Can we just assume that crc will always be used and depend on
> build-cc.m4? I guess the more robust way to do things is to do the
> following in bootstrap.conf:
> 
>      bootstrap_post_import_hook ()
>      {
>        $gnulib_tool --copy-file m4/build-cc.m4
>      }
> 
> Like we do for tests/init.sh.

Well given we also need to call gl_BUILD_CC perhaps the
best way would be to have a separate build-cc gnulib module
and have the crc module depend on that. I'm fine just depending
on crc for now though, though I can see a build-cc gnulib module
being generally useful.

Talking about crc, given our crctab.c has expanded recently,
it probably makes sense to generate that at build time also.

The patch looks good, and I tested with:
make BUILD_CC=clang BUILD_CFLAGS=-m32 V=1

I'll apply later and squash the following in
to avoid `make syntax-check` failures,
and remove a stale entry from .gitignore.

thank you!
Pádraig

diff --git a/.gitignore b/.gitignore
index bafeb2bc5..ba7344994 100644
--- a/.gitignore
+++ b/.gitignore
@@ -201,7 +201,6 @@
  /src/fs-kernel-magic
  /src/fs-latest-magic.h
  /src/fs-magic
-/src/make-prime-list
  /src/primes.h
  /src/single-binary.mk
  /src/version.c
diff --git a/cfg.mk b/cfg.mk
index e147d4ae7..fa032f52e 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -869,7 +869,7 @@ exclude_file_name_regexp--sc_system_h_headers = \
    ^src/((system|copy|chown-core|find-mount-point)\.h|make-prime-list\.c)$$

  _src := (false|lbracket|chown-(chgrp|chown)
-_src := $(_src)|ls-(dir|ls|vdir)|tac-pipe|uname-(arch|uname))
+_src := $(_src)|ls-(dir|ls|vdir)|make-prime-list|tac-pipe|uname-(arch|uname))
  _gl_src = (xdecto.max|cl-strtold)
  exclude_file_name_regexp--sc_require_config_h_first = \
    (^lib/buffer-lcm\.c|gl/lib/$(_gl_src)\.c|src/$(_src)\.c)$$
@@ -921,8 +921,10 @@ exclude_file_name_regexp--sc_prohibit_operator_at_end_of_line = \
  exclude_file_name_regexp--sc_error_message_uppercase = ^src/factor\.c$$
  exclude_file_name_regexp--sc_prohibit_atoi_atof = ^src/make-prime-list\.c$$

-# Exception here as we don't want __attribute elided on non GCC
-exclude_file_name_regexp--sc_prohibit-gl-attributes = ^src/libstdbuf\.c$$
+# Exception here as we don't want __attribute elided on non GCC for stdbuf
+# and we don't want to depend on gnulib for make-prime-list
+exclude_file_name_regexp--sc_prohibit-gl-attributes = \
+  ^src/(make-prime-list|libstdbuf)\.c$$

  exclude_file_name_regexp--sc_prohibit_uppercase_id_est = \.diff$$
  exclude_file_name_regexp--sc_ensure_dblspace_after_dot_before_id_est = \.diff$$
diff --git a/src/local.mk b/src/local.mk
index 833c714e1..68c7db63a 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -559,8 +559,8 @@ $(top_srcdir)/src/primes.h: $(top_srcdir)/src/make-prime-list.c
           $(MKDIR_P) $(top_srcdir)/src/primes-tmp \
           && (cd $(top_srcdir)/src/primes-tmp \
               && $(BUILD_CC) $(BUILD_CPPFLAGS) $(BUILD_CFLAGS) \
-               $(BUILD_LDFLAGS) -o make-prime-list$(EXEEXT) \
-               $(abs_top_srcdir)/src/make-prime-list.c) \
+               $(BUILD_LDFLAGS) -o make-prime-list$(EXEEXT) \
+               $(abs_top_srcdir)/src/make-prime-list.c) \
           && rm -f $@ $@-t \
           && $(top_srcdir)/src/primes-tmp/make-prime-list$(EXEEXT) \
             5000 > $@-t \

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Hi P=C3=A1draig,

P=C3=A1draig Brady <P@HIDDEN> writes:

> Well given we also need to call gl_BUILD_CC perhaps the
> best way would be to have a separate build-cc gnulib module
> and have the crc module depend on that. I'm fine just depending
> on crc for now though, though I can see a build-cc gnulib module
> being generally useful.

Yeah, that sounds better. But since it seems Coreutils is the only one
using it I am not in a rush to do it. :)

> Talking about crc, given our crctab.c has expanded recently,
> it probably makes sense to generate that at build time also.

I can have a look at that. Seems fairly simple.

> The patch looks good, and I tested with:
> make BUILD_CC=3Dclang BUILD_CFLAGS=3D-m32 V=3D1
>
> I'll apply later and squash the following in
> to avoid `make syntax-check` failures,
> and remove a stale entry from .gitignore.

Thanks! I forgot to run 'make syntax-check'.

Collin

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