Re: CI failure on Solaris 11.4

Bruno Haible via Gnulib discussion list <[email protected]>
Newsgroups gmane.comp.lib.gnulib.bugs
Message-ID <3738873.7x91mkYCy2@cagnes> 
Pádraig Brady wrote:
> The attached adds an extra configure time check for this issue,
> and I've verified that fixes the issue for numfmt, printf, seq on Solaris.

Thanks for the investigation and fix.

I'm adding this patch
  - to document the issue,
  - to add a test case. (We should not need to run the coreutils test suite
    in order to detect whether vasnprintf is working right.)

Bruno
0001-Add-unit-tests-and-doc-for-the-Lf-large-precision-is.patch (text/x-patch, 10 KB) 
From 78a859110fdbd297cedaa8bbba132c60976bfb4c Mon Sep 17 00:00:00 2001
From: Bruno Haible <[email protected]>
Date: Fri, 14 Aug 2026 19:56:38 +0200
Subject: [PATCH] Add unit tests and doc for the %Lf large precision issue on
 Solaris.

* tests/test-vasnprintf-posix.c (test_function): Add a testcase for
"%.5119Lf".
* tests/test-vasprintf-posix.c (test_function): Likewise.
* tests/test-snprintf-posix.h (test_function): Likewise.
* tests/test-sprintf-posix.h (test_function): Likewise.
* tests/test-vasnwprintf-posix.c (test_function): Likewise.
* doc/posix-functions/*printf.texi: Document the Solaris 11.4 bug.
---
 ChangeLog                          | 11 +++++++++++
 doc/posix-functions/fprintf.texi   |  2 +-
 doc/posix-functions/printf.texi    |  2 +-
 doc/posix-functions/snprintf.texi  |  2 +-
 doc/posix-functions/sprintf.texi   |  2 +-
 doc/posix-functions/vfprintf.texi  |  2 +-
 doc/posix-functions/vprintf.texi   |  2 +-
 doc/posix-functions/vsnprintf.texi |  2 +-
 doc/posix-functions/vsprintf.texi  |  2 +-
 tests/test-snprintf-posix.h        | 13 ++++++++++++-
 tests/test-sprintf-posix.h         | 13 ++++++++++++-
 tests/test-vasnprintf-posix.c      | 14 ++++++++++++++
 tests/test-vasnwprintf-posix.c     | 14 ++++++++++++++
 tests/test-vasprintf-posix.c       | 14 ++++++++++++++
 14 files changed, 85 insertions(+), 10 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 5ebd27d047..65793e578c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+2026-08-14  Bruno Haible  <[email protected]>
+
+	Add unit tests and doc for the %Lf large precision issue on Solaris.
+	* tests/test-vasnprintf-posix.c (test_function): Add a testcase for
+	"%.5119Lf".
+	* tests/test-vasprintf-posix.c (test_function): Likewise.
+	* tests/test-snprintf-posix.h (test_function): Likewise.
+	* tests/test-sprintf-posix.h (test_function): Likewise.
+	* tests/test-vasnwprintf-posix.c (test_function): Likewise.
+	* doc/posix-functions/*printf.texi: Document the Solaris 11.4 bug.
+
 2026-08-14  Pádraig Brady  <[email protected]>
 
 	tests: avoid -Wformat= warning re unsigned mismatch
diff --git a/doc/posix-functions/fprintf.texi b/doc/posix-functions/fprintf.texi
index 2b0f2cb7e2..8e6ef3a3e9 100644
--- a/doc/posix-functions/fprintf.texi
+++ b/doc/posix-functions/fprintf.texi
@@ -103,7 +103,7 @@
 This function mishandles large floating point precisions
 (for example, formatting 1.0 with @samp{"%.511f"})
 on some platforms:
-Solaris 10.
+Solaris 11.4.
 @item
 This function produces wrong output for the @samp{lc} directive with a NUL
 wide character argument on some platforms:
diff --git a/doc/posix-functions/printf.texi b/doc/posix-functions/printf.texi
index f57c16ba47..47167fdea2 100644
--- a/doc/posix-functions/printf.texi
+++ b/doc/posix-functions/printf.texi
@@ -103,7 +103,7 @@
 This function mishandles large floating point precisions
 (for example, formatting 1.0 with @samp{"%.511f"})
 on some platforms:
-Solaris 10.
+Solaris 11.4.
 @item
 This function produces wrong output for the @samp{lc} directive with a NUL
 wide character argument on some platforms:
diff --git a/doc/posix-functions/snprintf.texi b/doc/posix-functions/snprintf.texi
index 23dd6704fa..ba2578b2ba 100644
--- a/doc/posix-functions/snprintf.texi
+++ b/doc/posix-functions/snprintf.texi
@@ -102,7 +102,7 @@
 This function mishandles large floating point precisions
 (for example, formatting 1.0 with @samp{"%.511f"})
 on some platforms:
-Solaris 10.
+Solaris 11.4.
 @item
 This function produces wrong output for the @samp{lc} directive with a NUL
 wide character argument on some platforms:
diff --git a/doc/posix-functions/sprintf.texi b/doc/posix-functions/sprintf.texi
index 8dd59ed611..2948797c6b 100644
--- a/doc/posix-functions/sprintf.texi
+++ b/doc/posix-functions/sprintf.texi
@@ -90,7 +90,7 @@
 This function mishandles large floating point precisions
 (for example, formatting 1.0 with @samp{"%.511f"})
 on some platforms:
-Solaris 10.
+Solaris 11.4.
 @item
 This function produces wrong output for the @samp{lc} directive with a NUL
 wide character argument on some platforms:
diff --git a/doc/posix-functions/vfprintf.texi b/doc/posix-functions/vfprintf.texi
index feaa2318c1..52b9491a63 100644
--- a/doc/posix-functions/vfprintf.texi
+++ b/doc/posix-functions/vfprintf.texi
@@ -103,7 +103,7 @@
 This function mishandles large floating point precisions
 (for example, formatting 1.0 with @samp{"%.511f"})
 on some platforms:
-Solaris 10.
+Solaris 11.4.
 @item
 This function produces wrong output for the @samp{lc} directive with a NUL
 wide character argument on some platforms:
diff --git a/doc/posix-functions/vprintf.texi b/doc/posix-functions/vprintf.texi
index 1256971aec..97bf877a1a 100644
--- a/doc/posix-functions/vprintf.texi
+++ b/doc/posix-functions/vprintf.texi
@@ -103,7 +103,7 @@
 This function mishandles large floating point precisions
 (for example, formatting 1.0 with @samp{"%.511f"})
 on some platforms:
-Solaris 10.
+Solaris 11.4.
 @item
 This function produces wrong output for the @samp{lc} directive with a NUL
 wide character argument on some platforms:
diff --git a/doc/posix-functions/vsnprintf.texi b/doc/posix-functions/vsnprintf.texi
index 8a6ca05706..f23e3967a5 100644
--- a/doc/posix-functions/vsnprintf.texi
+++ b/doc/posix-functions/vsnprintf.texi
@@ -99,7 +99,7 @@
 This function mishandles large floating point precisions
 (for example, formatting 1.0 with @samp{"%.511f"})
 on some platforms:
-Solaris 10.
+Solaris 11.4.
 @item
 This function produces wrong output for the @samp{lc} directive with a NUL
 wide character argument on some platforms:
diff --git a/doc/posix-functions/vsprintf.texi b/doc/posix-functions/vsprintf.texi
index b94afc2eca..907bf74443 100644
--- a/doc/posix-functions/vsprintf.texi
+++ b/doc/posix-functions/vsprintf.texi
@@ -90,7 +90,7 @@
 This function mishandles large floating point precisions
 (for example, formatting 1.0 with @samp{"%.511f"})
 on some platforms:
-Solaris 10.
+Solaris 11.4.
 @item
 This function produces wrong output for the @samp{lc} directive with a NUL
 wide character argument on some platforms:
diff --git a/tests/test-snprintf-posix.h b/tests/test-snprintf-posix.h
index d7a3b4eda2..18d285b05b 100644
--- a/tests/test-snprintf-posix.h
+++ b/tests/test-snprintf-posix.h
@@ -79,7 +79,7 @@ static void
 test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
 {
   char buf[8];
-  char result[5000];
+  char result[10000];
 
   /* Test return value convention.  */
 
@@ -2955,6 +2955,17 @@ test_function (int (*my_snprintf) (char *, size_t, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  {
+    int retval =
+      my_snprintf (result, sizeof (result), "%.5119Lf %d", 1.0L, 99);
+    ASSERT (result[0] == '1');
+    ASSERT (result[1] == '.');
+    for (size_t i = 0; i < 5119; i++)
+      ASSERT (result[2 + i] == '0');
+    ASSERT (streq (result + 2 + 5119, " 99"));
+    ASSERT (retval == strlen (result));
+  }
+
   {
     char input[5000];
     int retval;
diff --git a/tests/test-sprintf-posix.h b/tests/test-sprintf-posix.h
index 40d4be65c6..007b8ba56d 100644
--- a/tests/test-sprintf-posix.h
+++ b/tests/test-sprintf-posix.h
@@ -78,7 +78,7 @@ strisnan (const char *string, size_t start_index, size_t end_index, int uppercas
 static void
 test_function (int (*my_sprintf) (char *, const char *, ...))
 {
-  char result[5000];
+  char result[10000];
   char buf[8];
 
   /* Test return value convention.  */
@@ -2942,6 +2942,17 @@ test_function (int (*my_sprintf) (char *, const char *, ...))
     ASSERT (retval == strlen (result));
   }
 
+  {
+    int retval =
+      my_sprintf (result, "%.5119Lf %d", 1.0L, 99);
+    ASSERT (result[0] == '1');
+    ASSERT (result[1] == '.');
+    for (size_t i = 0; i < 5119; i++)
+      ASSERT (result[2 + i] == '0');
+    ASSERT (streq (result + 2 + 5119, " 99"));
+    ASSERT (retval == strlen (result));
+  }
+
   {
     char input[5000];
     int retval;
diff --git a/tests/test-vasnprintf-posix.c b/tests/test-vasnprintf-posix.c
index fe0a59d647..9019f8d460 100644
--- a/tests/test-vasnprintf-posix.c
+++ b/tests/test-vasnprintf-posix.c
@@ -3809,6 +3809,20 @@ test_function (char * (*my_asnprintf) (char *, size_t *, const char *, ...))
     free (result);
   }
 
+  {
+    size_t length;
+    char *result =
+      my_asnprintf (NULL, &length, "%.5119Lf %d", 1.0L, 99);
+    ASSERT (result != NULL);
+    ASSERT (result[0] == '1');
+    ASSERT (result[1] == '.');
+    for (size_t i = 0; i < 5119; i++)
+      ASSERT (result[2 + i] == '0');
+    ASSERT (streq (result + 2 + 5119, " 99"));
+    ASSERT (length == strlen (result));
+    free (result);
+  }
+
   {
     char input[5000];
     size_t length;
diff --git a/tests/test-vasnwprintf-posix.c b/tests/test-vasnwprintf-posix.c
index d1b3d6e0bb..765b21b57a 100644
--- a/tests/test-vasnwprintf-posix.c
+++ b/tests/test-vasnwprintf-posix.c
@@ -3813,6 +3813,20 @@ test_function (wchar_t * (*my_asnwprintf) (wchar_t *, size_t *, const wchar_t *,
     free (result);
   }
 
+  {
+    size_t length;
+    wchar_t *result =
+      my_asnwprintf (NULL, &length, L"%.5119Lf %d", 1.0L, 99);
+    ASSERT (result != NULL);
+    ASSERT (result[0] == '1');
+    ASSERT (result[1] == '.');
+    for (size_t i = 0; i < 5119; i++)
+      ASSERT (result[2 + i] == '0');
+    ASSERT (wcscmp (result + 2 + 5119, L" 99") == 0);
+    ASSERT (length == wcslen (result));
+    free (result);
+  }
+
   {
     char input[5000];
     size_t length;
diff --git a/tests/test-vasprintf-posix.c b/tests/test-vasprintf-posix.c
index 6d62468cce..d38541ffb4 100644
--- a/tests/test-vasprintf-posix.c
+++ b/tests/test-vasprintf-posix.c
@@ -3793,6 +3793,20 @@ test_function (int (*my_asprintf) (char **, const char *, ...))
     free (result);
   }
 
+  {
+    char *result;
+    int retval =
+      my_asprintf (&result, "%.5119Lf %d", 1.0L, 99);
+    ASSERT (result != NULL);
+    ASSERT (result[0] == '1');
+    ASSERT (result[1] == '.');
+    for (size_t i = 0; i < 5119; i++)
+      ASSERT (result[2 + i] == '0');
+    ASSERT (streq (result + 2 + 5119, " 99"));
+    ASSERT (retval == strlen (result));
+    free (result);
+  }
+
   {
     char input[5000];
     char *result;
-- 
2.53.0
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