X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=m4%2Fjm-glibc-io.m4;h=3d32b9ff5adaf5d77b0384838f97e9b6c2b8138d;hb=264a64244c721c14c74448bb003efda5059e37a9;hp=115601f32eedfe70f79de35750e5888e9e1f938d;hpb=4dc4afb121108fad28cfecaf671ca8368482b8b6;p=gnulib.git

diff --git a/m4/jm-glibc-io.m4 b/m4/jm-glibc-io.m4
index 115601f32..3d32b9ff5 100644
--- a/m4/jm-glibc-io.m4
+++ b/m4/jm-glibc-io.m4
@@ -1,23 +1,35 @@
-#serial 1
+dnl This file is automatically generated from jm-glibc-io.m4n.
+
+#serial 6 -*- autoconf -*-
 
 dnl From Jim Meyering.
 dnl
 dnl See if the glibc *_unlocked I/O macros are available.
+dnl Use only those *_unlocked macros that are declared.
 dnl
 
 AC_DEFUN(jm_FUNC_GLIBC_UNLOCKED_IO,
-  [AC_CHECK_FUNCS(				\
-    clearerr_unlocked				\
-    feof_unlocked				\
-    ferror_unlocked				\
-    fflush_unlocked				\
-    fputc_unlocked				\
-    fread_unlocked				\
-    fwrite_unlocked				\
-    getc_unlocked				\
-    getchar_unlocked				\
-    putc_unlocked				\
-    putchar_unlocked				\
-   )
+  [
+    # Kludge (not executed) to make autoheader do the right thing.
+    if test a = b; then
+      AC_CHECK_DECLS([clearerr_unlocked,feof_unlocked,ferror_unlocked,fflush_unlocked,fgets_unlocked,fputc_unlocked,fputs_unlocked,fread_unlocked,fwrite_unlocked,getc_unlocked,getchar_unlocked,putc_unlocked,putchar_unlocked])
+      AC_CHECK_FUNCS(clearerr_unlocked feof_unlocked ferror_unlocked fflush_unlocked fgets_unlocked fputc_unlocked fputs_unlocked fread_unlocked fwrite_unlocked getc_unlocked getchar_unlocked putc_unlocked putchar_unlocked)
+    fi
+
+    io_functions='clearerr_unlocked feof_unlocked ferror_unlocked fflush_unlocked fgets_unlocked fputc_unlocked fputs_unlocked fread_unlocked fwrite_unlocked getc_unlocked getchar_unlocked putc_unlocked putchar_unlocked'
+
+    for jm_io_func in $io_functions; do
+      # Check for the existence of each function only if it is declared.
+      # Otherwise, we'd get the Solaris5.5.1 functions that are not
+      # declared, and that have been removed from Solaris5.6.  The resulting
+      # 5.5.1 binaries would not run on 5.6 due to shared library differences.
+      AC_CHECK_DECLS([$jm_io_func],
+		     jm_declared=yes,
+		     jm_declared=no,
+		     [#include <stdio.h>])
+      if test $jm_declared = yes; then
+        AC_CHECK_FUNCS($jm_io_func)
+      fi
+    done
   ]
 )