Added Redirects to longdouble error functions [BZ #29033]

This patch redirects the error functions to the appropriate
longdouble variants which enables the compiler to optimize
for the abi ieeelongdouble.

Signed-off-by: Sachin Monga <smonga@linux.ibm.com>

1 files changed, 87 insertions, 0 deletions

diff --git a/misc/tst-ldbl-errorfptr.c b/misc/tst-ldbl-errorfptr.c
new file mode 100644
index 0000000..155932a
--- /dev/null
+++ b/misc/tst-ldbl-errorfptr.c
@@ -0,0 +1,87 @@
+/* Test for the long double redirections in error* functions
+   when they are returned as function pointer BZ #29033.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <err.h>
+#include <errno.h>
+#include <error.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stdlib.h>
+#include <dlfcn.h>
+#include <sys/cdefs.h>
+
+#include <support/capture_subprocess.h>
+#include <support/check.h>
+#include <support/xdlfcn.h>
+
+#if __LDOUBLE_REDIRECTS_TO_FLOAT128_ABI == 1
+# define LDBL_NAME(alias) "__" #alias "ieee128"
+#elif defined __LONG_DOUBLE_MATH_OPTIONAL && defined __NO_LONG_DOUBLE_MATH
+# define LDBL_NAME(alias) "__nldbl_" #alias
+#else
+# define LDBL_NAME(alias) #alias
+#endif
+
+typedef void (*error_func_t) (int, int, const char*, ...);
+typedef void (*error_at_line_func_t) (int, int, const char*,
+	      unsigned int, const char*, ...);
+
+error_func_t
+__attribute__ ((noinline))
+get_error_func (void) {
+  return &error;
+}
+
+error_at_line_func_t
+__attribute__ ((noinline))
+get_error_at_line_func (void) {
+  return &error_at_line;
+}
+
+static int
+do_test (void)
+{
+  /* Prepare the symbol names as per long double standards */
+  char *error_sym = NULL;
+  char *error_sym_at_line = NULL;
+  error_sym = (char *) LDBL_NAME(error);
+  error_sym_at_line = (char *) LDBL_NAME(error_at_line);
+  TEST_VERIFY (error_sym != NULL && error_sym_at_line != NULL);
+  /* Map the function pointers to appropriate redirected error symbols */
+  error_func_t fp;
+  fp = get_error_func ();
+  if (fp != xdlsym (RTLD_DEFAULT, error_sym))
+    {
+      printf ("FAIL: fp=%p error_sym=%p\n", fp, error_sym);
+      return 1;
+    }
+
+  error_at_line_func_t fpat;
+  fpat = get_error_at_line_func ();
+  if (fpat != xdlsym (RTLD_DEFAULT, error_sym_at_line))
+    {
+      printf ("FAIL: fpat=%p error_sym_at_line=%p\n",
+	      fpat, error_sym_at_line);
+      return 1;
+    }
+
+  return 0;
+}
+
+#include <support/test-driver.c>