Declare system functions in a way that works with C++.

* m4/fdopendir.m4 (gl_FUNC_FDOPENDIR) [C++]: In the test program,
declare fdopendir as extern "C".
* m4/frexpl.m4 (gl_FUNC_FREXPL_WORKS) [C++]: In the test program,
declare frexpl as extern "C".
* m4/getaddrinfo.m4 (gl_GETADDRINFO) [C++]: In the test program,
declare gai_strerror as extern "C".
* m4/getdomainname.m4 (gl_FUNC_GETDOMAINNAME) [C++]: In the test
programs, declare gai_strerror as extern "C".
* m4/getlogin_r.m4 (gl_FUNC_GETLOGIN_R) [C++]: In the test program,
declare getlogin_r as extern "C".
* m4/ioctl.m4 (gl_FUNC_IOCTL) [C++]: In the test program, declare ioctl
as extern "C".
* m4/ldexpl.m4 (gl_FUNC_LDEXPL_WORKS) [C++]: In the test program,
declare ldexpl as extern "C".
* m4/logb.m4 (gl_FUNC_LOGB) [C++]: In the test programs, declare logb
as extern "C".
* m4/ls-mntd-fs.m4 (gl_LIST_MOUNTED_FILE_SYSTEMS) [C++]: In the test
program, declare getmntinfo as extern "C".
* m4/stpncpy.m4 (gl_FUNC_STPNCPY) [C++]: In the test program, declare
stpncpy as extern "C".
* m4/strerror_r.m4 (gl_FUNC_STRERROR_R_WORKS) [C++]: In the test
program, declare __xpg_strerror_r as extern "C".
* m4/strndup.m4 (gl_FUNC_STRNDUP) [C++]: In the test program, declare
strndup as extern "C".
* m4/sys_select_h.m4 (gl_HEADER_SYS_SELECT) [C++]: In the test program,
declare memset and bzero as extern "C".
Reported by Sam Steingold <sds@gnu.org>.

diff --git a/ChangeLog b/ChangeLog
index 91abaf5daf5aa0d17590d6ecc30a1eabf31c3c9a..606b9fe13e837a08e675d53cc4f3ce38fb5f8bc8 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,34 @@
+2011-07-21  Bruno Haible  <bruno@clisp.org>
+
+       Declare system functions in a way that works with C++.
+       * m4/fdopendir.m4 (gl_FUNC_FDOPENDIR) [C++]: In the test program,
+       declare fdopendir as extern "C".
+       * m4/frexpl.m4 (gl_FUNC_FREXPL_WORKS) [C++]: In the test program,
+       declare frexpl as extern "C".
+       * m4/getaddrinfo.m4 (gl_GETADDRINFO) [C++]: In the test program,
+       declare gai_strerror as extern "C".
+       * m4/getdomainname.m4 (gl_FUNC_GETDOMAINNAME) [C++]: In the test
+       programs, declare gai_strerror as extern "C".
+       * m4/getlogin_r.m4 (gl_FUNC_GETLOGIN_R) [C++]: In the test program,
+       declare getlogin_r as extern "C".
+       * m4/ioctl.m4 (gl_FUNC_IOCTL) [C++]: In the test program, declare ioctl
+       as extern "C".
+       * m4/ldexpl.m4 (gl_FUNC_LDEXPL_WORKS) [C++]: In the test program,
+       declare ldexpl as extern "C".
+       * m4/logb.m4 (gl_FUNC_LOGB) [C++]: In the test programs, declare logb
+       as extern "C".
+       * m4/ls-mntd-fs.m4 (gl_LIST_MOUNTED_FILE_SYSTEMS) [C++]: In the test
+       program, declare getmntinfo as extern "C".
+       * m4/stpncpy.m4 (gl_FUNC_STPNCPY) [C++]: In the test program, declare
+       stpncpy as extern "C".
+       * m4/strerror_r.m4 (gl_FUNC_STRERROR_R_WORKS) [C++]: In the test
+       program, declare __xpg_strerror_r as extern "C".
+       * m4/strndup.m4 (gl_FUNC_STRNDUP) [C++]: In the test program, declare
+       strndup as extern "C".
+       * m4/sys_select_h.m4 (gl_HEADER_SYS_SELECT) [C++]: In the test program,
+       declare memset and bzero as extern "C".
+       Reported by Sam Steingold <sds@gnu.org>.
+
 2011-07-12  Jim Meyering  <meyering@redhat.com>
 
        maint.mk: prohibit inclusion of "verify.h" without use

diff --git a/m4/fdopendir.m4 b/m4/fdopendir.m4
index 25dee3fc404ee56bd9543a19c87831883a7e3b61..f0d8cfa67430db8d9b4a55d7a7e6def36d4fe739 100644 (file)
--- a/m4/fdopendir.m4
+++ b/m4/fdopendir.m4
@@ -1,4 +1,4 @@
-# serial 7
+# serial 8
 # See if we need to provide fdopendir.
 
 dnl Copyright (C) 2009-2011 Free Software Foundation, Inc.
@@ -26,7 +26,11 @@ AC_DEFUN([gl_FUNC_FDOPENDIR],
 #include <fcntl.h>
 #include <unistd.h>
 #if !HAVE_DECL_FDOPENDIR
-extern DIR *fdopendir (int);
+extern
+# ifdef __cplusplus
+"C"
+# endif
+DIR *fdopendir (int);
 #endif
 ]], [int result = 0;
      int fd = open ("conftest.c", O_RDONLY);

diff --git a/m4/frexpl.m4 b/m4/frexpl.m4
index 63fcb1a8b4100644c17269449c37a7560e11a21e..2e8c68136dc7d0b03f54273ba9b4f41caca9fcac 100644 (file)
--- a/m4/frexpl.m4
+++ b/m4/frexpl.m4
@@ -1,4 +1,4 @@
-# frexpl.m4 serial 14
+# frexpl.m4 serial 15
 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -115,7 +115,11 @@ AC_DEFUN([gl_FUNC_FREXPL_WORKS],
 # undef LDBL_MIN_EXP
 # define LDBL_MIN_EXP    (-16381)
 #endif
-extern long double frexpl (long double, int *);
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double frexpl (long double, int *);
 int main()
 {
   int result = 0;

diff --git a/m4/getaddrinfo.m4 b/m4/getaddrinfo.m4
index 20a62261189acfceec4651ed8a8d762cf6f3c071..4fecfb2fa357db020f25b12aefcba9985d435fbd 100644 (file)
--- a/m4/getaddrinfo.m4
+++ b/m4/getaddrinfo.m4
@@ -1,4 +1,4 @@
-# getaddrinfo.m4 serial 26
+# getaddrinfo.m4 serial 27
 dnl Copyright (C) 2004-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -92,7 +92,11 @@ AC_DEFUN([gl_GETADDRINFO],
 #include <ws2tcpip.h>
 #endif
 #include <stddef.h>
-extern const char *gai_strerror(int);]])],
+extern
+#ifdef __cplusplus
+"C"
+#endif
+const char *gai_strerror(int);]])],
         [gl_cv_func_gai_strerror_posix_signature=yes],
         [gl_cv_func_gai_strerror_posix_signature=no])])
     if test $gl_cv_func_gai_strerror_posix_signature = no; then

diff --git a/m4/getdomainname.m4 b/m4/getdomainname.m4
index 9e93fc93cde4fb918d12796910045921beecec56..542e4cead44e65459883b06e886a37d884c30dcc 100644 (file)
--- a/m4/getdomainname.m4
+++ b/m4/getdomainname.m4
@@ -1,4 +1,4 @@
-# getdomainname.m4 serial 7
+# getdomainname.m4 serial 8
 dnl Copyright (C) 2002-2003, 2008-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -28,7 +28,11 @@ AC_DEFUN([gl_FUNC_GETDOMAINNAME],
        AC_LINK_IFELSE(
          [AC_LANG_PROGRAM(
             [[#include <stddef.h>
-              extern int getdomainname (char *, size_t);
+              extern
+              #ifdef __cplusplus
+              "C"
+              #endif
+              int getdomainname (char *, size_t);
             ]],
             [[getdomainname(NULL, 0);]])],
          [gl_cv_func_getdomainname_in_libnsl=yes])
@@ -63,7 +67,12 @@ AC_DEFUN([gl_FUNC_GETDOMAINNAME],
               #include <netdb.h>
               #endif
               #include <unistd.h>
-              extern int getdomainname (char *, int);]],
+              extern
+              #ifdef __cplusplus
+              "C"
+              #endif
+              int getdomainname (char *, int);
+            ]],
             [[]])],
          [gl_cv_decl_getdomainname_argtype2='int'],
          [gl_cv_decl_getdomainname_argtype2='size_t'])

diff --git a/m4/getlogin_r.m4 b/m4/getlogin_r.m4
index ad15c9879aabbafe1e090b6d6af5ba14082ff2d1..eb6744481d77a63dbcdf7e6cf18036fe40725f21 100644 (file)
--- a/m4/getlogin_r.m4
+++ b/m4/getlogin_r.m4
@@ -1,4 +1,4 @@
-#serial 10
+#serial 11
 
 # Copyright (C) 2005-2007, 2009-2011 Free Software Foundation, Inc.
 #
@@ -50,7 +50,11 @@ changequote([,])dnl
 #include <stddef.h>
 #include <unistd.h>
 #if !HAVE_DECL_GETLOGIN_R
-extern int getlogin_r (char *, size_t);
+extern
+# ifdef __cplusplus
+"C"
+# endif
+int getlogin_r (char *, size_t);
 #endif
 int
 main (void)

diff --git a/m4/ioctl.m4 b/m4/ioctl.m4
index e799600f95381e7b6c847ce5f2ba24b38ba9006f..a1db8fc0964bbb9f8ec2774ed7608a146633c49c 100644 (file)
--- a/m4/ioctl.m4
+++ b/m4/ioctl.m4
@@ -1,4 +1,4 @@
-# ioctl.m4 serial 3
+# ioctl.m4 serial 4
 dnl Copyright (C) 2008-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -24,7 +24,12 @@ AC_DEFUN([gl_FUNC_IOCTL],
       [AC_COMPILE_IFELSE(
          [AC_LANG_PROGRAM(
             [[#include <sys/ioctl.h>]],
-            [[extern int ioctl (int, int, ...);]])
+            [[extern
+              #ifdef __cplusplus
+              "C"
+              #endif
+              int ioctl (int, int, ...);
+            ]])
          ],
          [gl_cv_func_ioctl_posix_signature=yes],
          [gl_cv_func_ioctl_posix_signature=no])

diff --git a/m4/ldexpl.m4 b/m4/ldexpl.m4
index 2f4cf4b89b3486ad161aa44cdce1c3a5d1ab453d..76101f336017259a185d11e438b7871ef804cfd3 100644 (file)
--- a/m4/ldexpl.m4
+++ b/m4/ldexpl.m4
@@ -1,4 +1,4 @@
-# ldexpl.m4 serial 11
+# ldexpl.m4 serial 12
 dnl Copyright (C) 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -86,7 +86,11 @@ AC_DEFUN([gl_FUNC_LDEXPL_WORKS],
       AC_RUN_IFELSE(
         [AC_LANG_SOURCE([[
 #include <math.h>
-extern long double ldexpl (long double, int);
+extern
+#ifdef __cplusplus
+"C"
+#endif
+long double ldexpl (long double, int);
 int main()
 {
   int result = 0;

diff --git a/m4/logb.m4 b/m4/logb.m4
index 855d5ec2c7bc7a828825565a31921b7832bddac4..972d38f7cef03ad61bf3c26dd08e905f831b255f 100644 (file)
--- a/m4/logb.m4
+++ b/m4/logb.m4
@@ -1,4 +1,4 @@
-# logb.m4 serial 2
+# logb.m4 serial 3
 dnl Copyright (C) 2010-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -20,7 +20,11 @@ AC_DEFUN([gl_FUNC_LOGB],
          # define __NO_MATH_INLINES 1 /* for glibc */
          #endif
          #include <math.h>
-         extern double logb (double x);
+         extern
+         #ifdef __cplusplus
+         "C"
+         #endif
+         double logb (double x);
          double x;]],
        [[x = logb(x);]])],
     [LOGB_LIBM=])
@@ -33,7 +37,11 @@ AC_DEFUN([gl_FUNC_LOGB],
            # define __NO_MATH_INLINES 1 /* for glibc */
            #endif
            #include <math.h>
-           extern double logb (double x);
+           extern
+           #ifdef __cplusplus
+           "C"
+           #endif
+           double logb (double x);
            double x;]],
          [[x = logb(x);]])],
       [LOGB_LIBM="-lm"])

diff --git a/m4/ls-mntd-fs.m4 b/m4/ls-mntd-fs.m4
index 72beaed9a4cfd00ce23290438c8e11563fac15f4..714d539bfe40cbd1b89be672e43f424a48d0bc3b 100644 (file)
--- a/m4/ls-mntd-fs.m4
+++ b/m4/ls-mntd-fs.m4
@@ -1,4 +1,4 @@
-# serial 28
+# serial 29
 # How to list mounted file systems.
 
 # Copyright (C) 1998-2004, 2006, 2009-2011 Free Software Foundation, Inc.
@@ -247,7 +247,11 @@ if test -z "$ac_list_mounted_fs"; then
 #if HAVE_SYS_STATVFS_H
 # include <sys/statvfs.h>
 #endif
-extern int getmntinfo (struct statfs **, int);
+extern
+#ifdef __cplusplus
+"C"
+#endif
+int getmntinfo (struct statfs **, int);
             ]], [])],
           [fu_cv_sys_mounted_getmntinfo2=no],
           [fu_cv_sys_mounted_getmntinfo2=yes])

diff --git a/m4/stpncpy.m4 b/m4/stpncpy.m4
index 9c9b77be492b27195135136257bac628e1af28e4..78627108ba98bd0e4879400eeca7d0884f10315d 100644 (file)
--- a/m4/stpncpy.m4
+++ b/m4/stpncpy.m4
@@ -1,4 +1,4 @@
-# stpncpy.m4 serial 14
+# stpncpy.m4 serial 15
 dnl Copyright (C) 2002-2003, 2005-2007, 2009-2011 Free Software Foundation,
 dnl Inc.
 dnl This file is free software; the Free Software Foundation
@@ -35,7 +35,11 @@ AC_DEFUN([gl_FUNC_STPNCPY],
 #include <string.h> /* for strcpy */
 /* The stpncpy prototype is missing in <string.h> on AIX 4.  */
 #if !HAVE_DECL_STPNCPY
-extern char *stpncpy (char *dest, const char *src, size_t n);
+extern
+# ifdef __cplusplus
+"C"
+# endif
+char *stpncpy (char *dest, const char *src, size_t n);
 #endif
 int main ()
 {

diff --git a/m4/strerror_r.m4 b/m4/strerror_r.m4
index f6aceff642f063be48f504d3c1e75dfbc02bcfa6..0c5cc696805ad5f5487a1fa60f1671d9c35deda9 100644 (file)
--- a/m4/strerror_r.m4
+++ b/m4/strerror_r.m4
@@ -1,4 +1,4 @@
-# strerror_r.m4 serial 12
+# strerror_r.m4 serial 13
 dnl Copyright (C) 2002, 2007-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -138,7 +138,11 @@ changequote([,])dnl
                [AC_LANG_PROGRAM(
                   [[#include <errno.h>
                     #include <string.h>
-                    extern int __xpg_strerror_r(int, char *, size_t);
+                    extern
+                    #ifdef __cplusplus
+                    "C"
+                    #endif
+                    int __xpg_strerror_r(int, char *, size_t);
                   ]],
                   [[int result = 0;
                     char buf[256] = "^";

diff --git a/m4/strndup.m4 b/m4/strndup.m4
index 969e3191a40fbec0ea2f6319d9ff5b560660308f..e1ac20b8aa437cb32eee9edcc1ec84b4dc78ac99 100644 (file)
--- a/m4/strndup.m4
+++ b/m4/strndup.m4
@@ -1,4 +1,4 @@
-# strndup.m4 serial 19
+# strndup.m4 serial 20
 dnl Copyright (C) 2002-2003, 2005-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -25,7 +25,11 @@ AC_DEFUN([gl_FUNC_STRNDUP],
          AC_LANG_PROGRAM([[#include <string.h>
                            #include <stdlib.h>]], [[
 #ifndef HAVE_DECL_STRNDUP
-  extern char *strndup (const char *, size_t);
+  extern
+  #ifdef __cplusplus
+  "C"
+  #endif
+  char *strndup (const char *, size_t);
 #endif
   char *s;
   s = strndup ("some longer string", 15);

diff --git a/m4/sys_select_h.m4 b/m4/sys_select_h.m4
index f7fd18aab1675bdd49849468eef81c474466640d..b1914fb80f0c05651f6ba4723283a5f0e0b582ba 100644 (file)
--- a/m4/sys_select_h.m4
+++ b/m4/sys_select_h.m4
@@ -1,4 +1,4 @@
-# sys_select_h.m4 serial 19
+# sys_select_h.m4 serial 20
 dnl Copyright (C) 2006-2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -32,10 +32,18 @@ AC_DEFUN([gl_HEADER_SYS_SELECT],
              [AC_LANG_PROGRAM([[#include <sys/select.h>]], [[
                   #undef memset
                   #define memset nonexistent_memset
-                  extern void *memset (void *, int, unsigned long);
+                  extern
+                  #ifdef __cplusplus
+                  "C"
+                  #endif
+                  void *memset (void *, int, unsigned long);
                   #undef bzero
                   #define bzero nonexistent_bzero
-                  extern void bzero (void *, unsigned long);
+                  extern
+                  #ifdef __cplusplus
+                  "C"
+                  #endif
+                  void bzero (void *, unsigned long);
                   fd_set fds;
                   FD_ZERO (&fds);
                 ]])