Some sort of locale problem? The issue seems to be benign, except that it's a false positive when testing.

To reproduce it, clone current gnulib (commit fde88b711c9b1df5b142444ac7b0bc2aa8892d3a) and current emacs (commit fd859fbea2e9d13e76db1c5295d9ddd1c5955d83) under the current directory, and then run:

cd emacs
LC_ALL=en_US.utf8 GNULIB_TOOL_IMPL=sh+py admin/merge-gnulib

Here's what happens on Ubuntu 23.10 x86-64:

$ GNULIB_TOOL_IMPL=sh+py admin/merge-gnulib
Checking whether you have the necessary tools...
(Read INSTALL.REPO for more details on building Emacs)
Checking for autoconf (need at least version 2.65) ... ok
Your system has the required tools.
Building aclocal.m4 ...
Running 'autoreconf -fi -I m4' ...
Building 'aclocal.m4' in exec ...
Running 'autoreconf -fi' in exec ...
Configuring local git repository...
'.git/config' -> '.git/config.~1~'
git config transfer.fsckObjects 'true'
git config diff.cpp.xfuncname '!^[ ]*[A-Za-z_][A-Za-z_0-9]*:[[:space:]]*($|/[/*])
^((::[[:space:]]*)?[A-Za-z_][A-Za-z_0-9]*[[:space:]]*\(.*)$
^((#define[[:space:]]|DEFUN).*)$'
git config diff.elisp.xfuncname '^\([^[:space:]]*def[^[:space:]]+[[:space:]]+([^()[:space:]]+)'
git config diff.m4.xfuncname '^((m4_)?define|A._DEFUN(_ONCE)?)\([^),]*'
git config diff.make.xfuncname '^([$.[:alnum:]_].*:|[[:alnum:]_]+[[:space:]]*([*:+]?[:?]?|!?)=|define .*)' git config diff.shell.xfuncname '^([[:space:]]*[[:alpha:]_][[:alnum:]_]*[[:space:]]*\(\)|[[:alpha:]_][[:alnum:]_]*=)'
git config diff.texinfo.xfuncname '^@node[[:space:]]+([^,[:space:]][^,]+)'
Installing git hooks...
'build-aux/git-hooks/commit-msg' -> '.git/hooks/commit-msg'
'build-aux/git-hooks/pre-commit' -> '.git/hooks/pre-commit'
'build-aux/git-hooks/prepare-commit-msg' -> '.git/hooks/prepare-commit-msg'
'build-aux/git-hooks/post-commit' -> '.git/hooks/post-commit'
'build-aux/git-hooks/pre-push' -> '.git/hooks/pre-push'
'build-aux/git-hooks/commit-msg-files.awk' -> '.git/hooks/commit-msg-files.awk'
'.git/hooks/applypatch-msg.sample' -> '.git/hooks/applypatch-msg'
'.git/hooks/pre-applypatch.sample' -> '.git/hooks/pre-applypatch'
You can now run './configure'.
../gnulib/gnulib-tool: *** gnulib-tool.py produced different files than gnulib-tool.sh! Compare /home/eggert/src/gnu/d/emacs and /home/eggert/src/gnu/d/glpyD3FBYw.
../gnulib/gnulib-tool: *** Stop.


The difference is between autom4te.cache/requests and ../glpyD3FBYw/autom4te.cache/requests. They're sorted differently:

$ diff -ur ./autom4te.cache/requests ../glpyD3FBYw/autom4te.cache/requests
--- ./autom4te.cache/requests   2024-05-04 08:47:45.397566582 -0700
+++ ../glpyD3FBYw/autom4te.cache/requests 2024-05-04 08:46:41.307448492 -0700
@@ -16,69 +16,69 @@
                         'configure.ac'
                       ],
                       {
-                        '_LT_AC_TAGCONFIG' => 1,
-                        'LT_INIT' => 1,
-                        'AM_XGETTEXT_OPTION' => 1,
-                        'm4_sinclude' => 1,
-                        '_AM_COND_IF' => 1,
-                        'AM_PROG_MOC' => 1,
+                        'AM_GNU_GETTEXT' => 1,
+                        'AC_CANONICAL_BUILD' => 1,
                         'AC_CONFIG_AUX_DIR' => 1,
+                        'AC_PROG_LIBTOOL' => 1,
+                        'm4_include' => 1,
+                        'AM_CONDITIONAL' => 1,
+                        'AM_PROG_MKDIR_P' => 1,
+                        '_AM_SUBST_NOTMAKE' => 1,
+                        'AM_EXTRA_RECURSIVE_TARGETS' => 1,
+                        'AC_DEFINE_TRACE_LITERAL' => 1,
+                        'AC_FC_FREEFORM' => 1,
+                        'm4_pattern_forbid' => 1,
+                        'AM_INIT_AUTOMAKE' => 1,
                         'LT_CONFIG_LTDL_DIR' => 1,
                         'AC_CANONICAL_SYSTEM' => 1,
-                        'AC_CANONICAL_BUILD' => 1,
-                        '_AM_COND_ELSE' => 1,
+                        'AC_FC_PP_DEFINE' => 1,
+                        'LT_INIT' => 1,
+                        'AC_FC_SRCEXT' => 1,
+                        'AC_LIBSOURCE' => 1,
                         'AC_CONFIG_LIBOBJ_DIR' => 1,
-                        'AM_PROG_CXX_C_O' => 1,
+                        'AM_PROG_FC_C_O' => 1,
                         'AC_CONFIG_HEADERS' => 1,
-                        'AM_GNU_GETTEXT' => 1,
+                        '_AM_COND_ELSE' => 1,
+                        'AC_CONFIG_SUBDIRS' => 1,
+                        'AM_PROG_CXX_C_O' => 1,
+                        'm4_sinclude' => 1,
+                        'AM_MAKEFILE_INCLUDE' => 1,
                         'AM_PROG_LIBTOOL' => 1,
+                        'AC_INIT' => 1,
+                        'include' => 1,
+                        '_AM_COND_ENDIF' => 1,
+                        'AM_POT_TOOLS' => 1,
+                        'AM_MAINTAINER_MODE' => 1,
+                        '_LT_AC_TAGCONFIG' => 1,
+                        '_AM_MAKEFILE_INCLUDE' => 1,
+                        'm4_pattern_allow' => 1,
+                        '_m4_warn' => 1,
+                        'AC_SUBST_TRACE' => 1,
                         'AH_OUTPUT' => 1,
-                        'AC_CONFIG_SUBDIRS' => 1,
-                        'sinclude' => 1,
-                        'AC_DEFINE_TRACE_LITERAL' => 1,
-                        'AM_PROG_FC_C_O' => 1,
-                        'AM_PROG_MKDIR_P' => 1,
-                        'AM_SILENT_RULES' => 1,
-                        'AM_PROG_F77_C_O' => 1,
+                        'AC_CONFIG_LINKS' => 1,
+                        'AM_GNU_GETTEXT_INTL_SUBDIR' => 1,
+                        'AM_XGETTEXT_OPTION' => 1,
+                        'AC_CANONICAL_TARGET' => 1,
+                        'LT_SUPPORTED_TAG' => 1,
+                        'AM_PROG_CC_C_O' => 1,
                         'GTK_DOC_CHECK' => 1,
+                        'AM_PATH_GUILE' => 1,
+                        'AM_SILENT_RULES' => 1,
+                        'AM_AUTOMAKE_VERSION' => 1,
+                        'AM_PROG_MOC' => 1,
+                        'AC_REQUIRE_AUX_FILE' => 1,
                         'AM_ENABLE_MULTILIB' => 1,
+                        'sinclude' => 1,
                         'AC_CONFIG_MACRO_DIR_TRACE' => 1,
+                        '_AM_COND_IF' => 1,
+                        'AC_FC_PP_SRCEXT' => 1,
+                        'AM_NLS' => 1,
                         'AM_PROG_AR' => 1,
-                        'AC_LIBSOURCE' => 1,
-                        'AM_MAKEFILE_INCLUDE' => 1,
+                        'AC_CANONICAL_HOST' => 1,
                         'IT_PROG_INTLTOOL' => 1,
-                        'm4_pattern_forbid' => 1,
-                        'AM_GNU_GETTEXT_INTL_SUBDIR' => 1,
-                        'AM_NLS' => 1,
-                        'AC_SUBST_TRACE' => 1,
-                        'AM_PATH_GUILE' => 1,
-                        'AC_FC_FREEFORM' => 1,
-                        'AM_POT_TOOLS' => 1,
-                        'AC_CANONICAL_TARGET' => 1,
-                        'AC_CONFIG_LINKS' => 1,
-                        '_m4_warn' => 1,
-                        '_AM_COND_ENDIF' => 1,
-                        'AM_AUTOMAKE_VERSION' => 1,
-                        'AM_PROG_CC_C_O' => 1,
                         'AC_SUBST' => 1,
-                        'm4_pattern_allow' => 1,
-                        'AC_PROG_LIBTOOL' => 1,
-                        'AM_EXTRA_RECURSIVE_TARGETS' => 1,
-                        'AC_CANONICAL_HOST' => 1,
-                        'AC_INIT' => 1,
-                        'AC_REQUIRE_AUX_FILE' => 1,
-                        'include' => 1,
-                        'AC_FC_PP_SRCEXT' => 1,
-                        'AC_FC_PP_DEFINE' => 1,
-                        'AM_INIT_AUTOMAKE' => 1,
-                        'm4_include' => 1,
-                        'AC_CONFIG_FILES' => 1,
-                        'AM_CONDITIONAL' => 1,
-                        '_AM_SUBST_NOTMAKE' => 1,
-                        'AM_MAINTAINER_MODE' => 1,
-                        'LT_SUPPORTED_TAG' => 1,
-                        '_AM_MAKEFILE_INCLUDE' => 1,
-                        'AC_FC_SRCEXT' => 1
+                        'AM_PROG_F77_C_O' => 1,
+                        'AC_CONFIG_FILES' => 1
                       }
                     ], 'Autom4te::Request' ),
              bless( [
@@ -95,69 +95,69 @@
                         'configure.ac'
                       ],
                       {
-                        '_LT_AC_TAGCONFIG' => 1,
-                        'LT_INIT' => 1,
-                        'm4_sinclude' => 1,
-                        'AM_XGETTEXT_OPTION' => 1,
-                        '_AM_COND_IF' => 1,
-                        'AM_PROG_MOC' => 1,
-                        'AC_CONFIG_AUX_DIR' => 1,
-                        'AC_CANONICAL_BUILD' => 1,
-                        'AC_CANONICAL_SYSTEM' => 1,
-                        'LT_CONFIG_LTDL_DIR' => 1,
+                        'include' => 1,
+                        'AM_MAKEFILE_INCLUDE' => 1,
+                        'AC_INIT' => 1,
+                        'AM_PROG_LIBTOOL' => 1,
+                        '_AM_COND_ENDIF' => 1,
                         'AC_CONFIG_LIBOBJ_DIR' => 1,
-                        'AM_PROG_CXX_C_O' => 1,
-                        '_AM_COND_ELSE' => 1,
                         'AC_CONFIG_HEADERS' => 1,
-                        'AM_PROG_LIBTOOL' => 1,
-                        'AM_GNU_GETTEXT' => 1,
-                        'AH_OUTPUT' => 1,
+                        'AM_PROG_FC_C_O' => 1,
                         'AC_CONFIG_SUBDIRS' => 1,
-                        'sinclude' => 1,
-                        'AM_PROG_MKDIR_P' => 1,
+                        '_AM_COND_ELSE' => 1,
+                        'm4_sinclude' => 1,
+                        'AM_PROG_CXX_C_O' => 1,
+                        'AC_CANONICAL_SYSTEM' => 1,
+                        'AC_FC_PP_DEFINE' => 1,
+                        'AC_LIBSOURCE' => 1,
+                        'LT_INIT' => 1,
+                        'AC_FC_SRCEXT' => 1,
+                        'AC_CANONICAL_BUILD' => 1,
+                        'AM_GNU_GETTEXT' => 1,
+                        'AC_CONFIG_AUX_DIR' => 1,
+                        'AM_CONDITIONAL' => 1,
+                        'AC_PROG_LIBTOOL' => 1,
+                        'm4_include' => 1,
+                        'AM_EXTRA_RECURSIVE_TARGETS' => 1,
                         'AC_DEFINE_TRACE_LITERAL' => 1,
-                        'AM_PROG_FC_C_O' => 1,
-                        'AM_PROG_F77_C_O' => 1,
-                        'AM_SILENT_RULES' => 1,
-                        'AM_ENABLE_MULTILIB' => 1,
-                        'GTK_DOC_CHECK' => 1,
+                        'AC_FC_FREEFORM' => 1,
+                        'AM_PROG_MKDIR_P' => 1,
+                        '_AM_SUBST_NOTMAKE' => 1,
+                        'm4_pattern_forbid' => 1,
+                        'AM_INIT_AUTOMAKE' => 1,
+                        'LT_CONFIG_LTDL_DIR' => 1,
+                        '_AM_COND_IF' => 1,
+                        'sinclude' => 1,
                         'AC_CONFIG_MACRO_DIR_TRACE' => 1,
+                        'AC_FC_PP_SRCEXT' => 1,
                         'AM_PROG_AR' => 1,
-                        'AC_LIBSOURCE' => 1,
-                        'AM_MAKEFILE_INCLUDE' => 1,
-                        'IT_PROG_INTLTOOL' => 1,
-                        'm4_pattern_forbid' => 1,
-                        'AM_GNU_GETTEXT_INTL_SUBDIR' => 1,
-                        'AM_PATH_GUILE' => 1,
-                        'AC_SUBST_TRACE' => 1,
                         'AM_NLS' => 1,
-                        'AM_POT_TOOLS' => 1,
-                        'AC_FC_FREEFORM' => 1,
+                        'AC_CANONICAL_HOST' => 1,
+                        'AM_PROG_F77_C_O' => 1,
+                        'AC_CONFIG_FILES' => 1,
+                        'IT_PROG_INTLTOOL' => 1,
+                        'AC_SUBST' => 1,
+                        'LT_SUPPORTED_TAG' => 1,
                         'AC_CANONICAL_TARGET' => 1,
-                        '_m4_warn' => 1,
-                        'AC_CONFIG_LINKS' => 1,
-                        '_AM_COND_ENDIF' => 1,
-                        'AM_PROG_CC_C_O' => 1,
+                        'AM_XGETTEXT_OPTION' => 1,
+                        'AM_SILENT_RULES' => 1,
+                        'AM_PATH_GUILE' => 1,
                         'AM_AUTOMAKE_VERSION' => 1,
-                        'AC_SUBST' => 1,
-                        'm4_pattern_allow' => 1,
-                        'AC_PROG_LIBTOOL' => 1,
-                        'AM_EXTRA_RECURSIVE_TARGETS' => 1,
-                        'AC_CANONICAL_HOST' => 1,
-                        'AC_INIT' => 1,
+                        'GTK_DOC_CHECK' => 1,
+                        'AM_PROG_CC_C_O' => 1,
                         'AC_REQUIRE_AUX_FILE' => 1,
-                        'include' => 1,
-                        'AC_FC_PP_SRCEXT' => 1,
-                        'AM_INIT_AUTOMAKE' => 1,
-                        'AC_FC_PP_DEFINE' => 1,
-                        'm4_include' => 1,
-                        'AC_CONFIG_FILES' => 1,
-                        'AM_CONDITIONAL' => 1,
-                        '_AM_SUBST_NOTMAKE' => 1,
+                        'AM_PROG_MOC' => 1,
+                        'AM_ENABLE_MULTILIB' => 1,
+                        '_m4_warn' => 1,
+                        'm4_pattern_allow' => 1,
+                        'AC_SUBST_TRACE' => 1,
+                        'AH_OUTPUT' => 1,
+                        'AC_CONFIG_LINKS' => 1,
+                        'AM_GNU_GETTEXT_INTL_SUBDIR' => 1,
                         'AM_MAINTAINER_MODE' => 1,
-                        '_AM_MAKEFILE_INCLUDE' => 1,
-                        'LT_SUPPORTED_TAG' => 1,
-                        'AC_FC_SRCEXT' => 1
+                        '_LT_AC_TAGCONFIG' => 1,
+                        'AM_POT_TOOLS' => 1,
+                        '_AM_MAKEFILE_INCLUDE' => 1
                       }
                     ], 'Autom4te::Request' ),
              bless( [
@@ -172,69 +172,69 @@
                         'configure.ac'
                       ],
                       {
-                        'm4_pattern_allow' => 1,
-                        'AC_SUBST' => 1,
-                        'AC_PROG_LIBTOOL' => 1,
-                        'AM_EXTRA_RECURSIVE_TARGETS' => 1,
-                        'AC_CANONICAL_HOST' => 1,
-                        'AC_INIT' => 1,
-                        'AC_REQUIRE_AUX_FILE' => 1,
-                        'include' => 1,
-                        'AC_FC_PP_SRCEXT' => 1,
-                        'AM_INIT_AUTOMAKE' => 1,
-                        'AC_FC_PP_DEFINE' => 1,
-                        'm4_include' => 1,
-                        'AC_CONFIG_FILES' => 1,
-                        'AM_CONDITIONAL' => 1,
-                        'AM_MAINTAINER_MODE' => 1,
-                        '_AM_SUBST_NOTMAKE' => 1,
-                        '_AM_MAKEFILE_INCLUDE' => 1,
                         'LT_SUPPORTED_TAG' => 1,
-                        'AC_FC_SRCEXT' => 1,
+                        'AC_CANONICAL_TARGET' => 1,
+                        'AM_XGETTEXT_OPTION' => 1,
+                        'AM_PATH_GUILE' => 1,
+                        'AM_SILENT_RULES' => 1,
+                        'AM_AUTOMAKE_VERSION' => 1,
+                        'GTK_DOC_CHECK' => 1,
+                        'AM_PROG_CC_C_O' => 1,
+                        'AC_REQUIRE_AUX_FILE' => 1,
+                        'AM_PROG_MOC' => 1,
+                        'AM_ENABLE_MULTILIB' => 1,
+                        '_AM_COND_IF' => 1,
+                        'sinclude' => 1,
                         'AC_CONFIG_MACRO_DIR_TRACE' => 1,
+                        'AC_FC_PP_SRCEXT' => 1,
+                        'AM_NLS' => 1,
                         'AM_PROG_AR' => 1,
-                        'AC_LIBSOURCE' => 1,
-                        'AM_MAKEFILE_INCLUDE' => 1,
+                        'AC_CANONICAL_HOST' => 1,
+                        'AC_CONFIG_FILES' => 1,
+                        'AM_PROG_F77_C_O' => 1,
                         'IT_PROG_INTLTOOL' => 1,
-                        'm4_pattern_forbid' => 1,
-                        'AM_GNU_GETTEXT_INTL_SUBDIR' => 1,
-                        'AM_PATH_GUILE' => 1,
-                        'AM_NLS' => 1,
-                        'AC_SUBST_TRACE' => 1,
+                        'AC_SUBST' => 1,
+                        'AM_MAINTAINER_MODE' => 1,
+                        '_LT_AC_TAGCONFIG' => 1,
                         'AM_POT_TOOLS' => 1,
-                        'AC_FC_FREEFORM' => 1,
-                        'AC_CANONICAL_TARGET' => 1,
+                        '_AM_MAKEFILE_INCLUDE' => 1,
                         '_m4_warn' => 1,
+                        'm4_pattern_allow' => 1,
+                        'AC_SUBST_TRACE' => 1,
+                        'AH_OUTPUT' => 1,
                         'AC_CONFIG_LINKS' => 1,
-                        '_AM_COND_ENDIF' => 1,
-                        'AM_PROG_CC_C_O' => 1,
-                        'AM_AUTOMAKE_VERSION' => 1,
+                        'AM_GNU_GETTEXT_INTL_SUBDIR' => 1,
+                        'AC_CONFIG_LIBOBJ_DIR' => 1,
+                        'AM_PROG_FC_C_O' => 1,
+                        '_AM_COND_ELSE' => 1,
+                        'AC_CONFIG_SUBDIRS' => 1,
                         'AC_CONFIG_HEADERS' => 1,
+                        'm4_sinclude' => 1,
+                        'AM_PROG_CXX_C_O' => 1,
+                        'include' => 1,
+                        'AM_MAKEFILE_INCLUDE' => 1,
+                        'AC_INIT' => 1,
                         'AM_PROG_LIBTOOL' => 1,
+                        '_AM_COND_ENDIF' => 1,
                         'AM_GNU_GETTEXT' => 1,
-                        'AH_OUTPUT' => 1,
-                        'AC_CONFIG_SUBDIRS' => 1,
-                        'sinclude' => 1,
-                        'AM_PROG_MKDIR_P' => 1,
-                        'AC_DEFINE_TRACE_LITERAL' => 1,
-                        'AM_PROG_FC_C_O' => 1,
-                        'AM_PROG_F77_C_O' => 1,
-                        'AM_SILENT_RULES' => 1,
-                        'AM_ENABLE_MULTILIB' => 1,
-                        'GTK_DOC_CHECK' => 1,
-                        '_LT_AC_TAGCONFIG' => 1,
-                        'LT_INIT' => 1,
-                        'm4_sinclude' => 1,
-                        'AM_XGETTEXT_OPTION' => 1,
-                        '_AM_COND_IF' => 1,
-                        'AM_PROG_MOC' => 1,
-                        'AC_CONFIG_AUX_DIR' => 1,
                         'AC_CANONICAL_BUILD' => 1,
-                        'AC_CANONICAL_SYSTEM' => 1,
+                        'AC_CONFIG_AUX_DIR' => 1,
+                        'AM_CONDITIONAL' => 1,
+                        'AC_PROG_LIBTOOL' => 1,
+                        'm4_include' => 1,
+                        'AM_EXTRA_RECURSIVE_TARGETS' => 1,
+                        'AC_FC_FREEFORM' => 1,
+                        'AC_DEFINE_TRACE_LITERAL' => 1,
+                        'AM_PROG_MKDIR_P' => 1,
+                        '_AM_SUBST_NOTMAKE' => 1,
+                        'm4_pattern_forbid' => 1,
+                        'AM_INIT_AUTOMAKE' => 1,
                         'LT_CONFIG_LTDL_DIR' => 1,
-                        'AC_CONFIG_LIBOBJ_DIR' => 1,
-                        'AM_PROG_CXX_C_O' => 1,
-                        '_AM_COND_ELSE' => 1
+                        'AC_CANONICAL_SYSTEM' => 1,
+                        'AC_FC_PP_DEFINE' => 1,
+                        'AC_LIBSOURCE' => 1,
+                        'LT_INIT' => 1,
+                        'AC_FC_SRCEXT' => 1
                       }
                     ], 'Autom4te::Request' )
            );

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