Install a the configure_file (config.h) and use in headers

This addresses: https://github.com/libfuse/libfuse/issues/724

HAVE_LIBC_VERSIONED_SYMBOLS configures the library if to use
versioned symbols and is set at meson configuration time.
External filesystems (the main target, actually)
include fuse headers and the preprocessor
then acts on HAVE_LIBC_VERSIONED_SYMBOLS. Problem was now that
'config.h' was not distributed with libfuse and so
HAVE_LIBC_VERSIONED_SYMBOLS was never defined with external
tools and the preprocessor did the wrong decision.

This commit also increases the the minimal meson version,
as this depends on meson feature only available in 0.50

<quote 'meson' >
WARNING: Project specifies a minimum meson_
version '>= 0.42' but uses features which were added
 in newer versions:
 * 0.50.0: {'install arg in configure_file'}
</quote>

Additionally the config file has been renamed to "fuse_config.h"
to avoid clashes - 'config.h' is not very specific.

29 files changed, 26 insertions, 42 deletions

diff --git a/example/passthrough.c b/example/passthrough.c
index ae13225..5963d58 100644
--- a/example/passthrough.c
+++ b/example/passthrough.c
@@ -25,10 +25,6 @@
 
 #define FUSE_USE_VERSION 31
 
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
 #define _GNU_SOURCE
 
 #ifdef linux
diff --git a/example/passthrough_fh.c b/example/passthrough_fh.c
index bdc5ecd..bc02794 100644
--- a/example/passthrough_fh.c
+++ b/example/passthrough_fh.c
@@ -25,10 +25,6 @@
 
 #define FUSE_USE_VERSION 31
 
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
 #define _GNU_SOURCE
 
 #include <fuse.h>
diff --git a/example/passthrough_hp.cc b/example/passthrough_hp.cc
index b367978..26fa42e 100644
--- a/example/passthrough_hp.cc
+++ b/example/passthrough_hp.cc
@@ -45,10 +45,6 @@
 
 #define FUSE_USE_VERSION FUSE_MAKE_VERSION(3, 12)
 
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
 #ifndef _GNU_SOURCE
 #define _GNU_SOURCE
 #endif
diff --git a/example/passthrough_ll.c b/example/passthrough_ll.c
index a1d237a..8b2eb4b 100644
--- a/example/passthrough_ll.c
+++ b/example/passthrough_ll.c
@@ -37,8 +37,6 @@
 #define _GNU_SOURCE
 #define FUSE_USE_VERSION 34
 
-#include "config.h"
-
 #include <fuse_lowlevel.h>
 #include <unistd.h>
 #include <stdlib.h>
diff --git a/example/poll.c b/example/poll.c
index 521e6aa..e231b96 100644
--- a/example/poll.c
+++ b/example/poll.c
@@ -23,8 +23,6 @@
 
 #define FUSE_USE_VERSION 31
 
-#include <config.h>
-
 #include <fuse.h>
 #include <unistd.h>
 #include <ctype.h>
diff --git a/example/poll_client.c b/example/poll_client.c
index 222452a..e51bd0e 100644
--- a/example/poll_client.c
+++ b/example/poll_client.c
@@ -19,7 +19,7 @@
  * \include poll_client.c
  */
 
-#include <config.h>
+#include <fuse_config.h>
 
 #include <sys/select.h>
 #include <sys/time.h>
diff --git a/example/printcap.c b/example/printcap.c
index 4867988..30e2057 100644
--- a/example/printcap.c
+++ b/example/printcap.c
@@ -21,8 +21,6 @@
 
 #define FUSE_USE_VERSION 31
 
-#include <config.h>
-
 #include <fuse_lowlevel.h>
 #include <stdio.h>
 #include <unistd.h>
diff --git a/include/fuse_common.h b/include/fuse_common.h
index cf9bc27..1d050bb 100644
--- a/include/fuse_common.h
+++ b/include/fuse_common.h
@@ -14,6 +14,7 @@
 #ifndef FUSE_COMMON_H_
 #define FUSE_COMMON_H_
 
+#include "fuse_config.h"
 #include "fuse_opt.h"
 #include "fuse_log.h"
 #include <stdint.h>
diff --git a/lib/buffer.c b/lib/buffer.c
index 757807a..4f2f491 100644
--- a/lib/buffer.c
+++ b/lib/buffer.c
@@ -11,7 +11,7 @@
 
 #define _GNU_SOURCE
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_i.h"
 #include "fuse_lowlevel.h"
 #include <string.h>
diff --git a/lib/compat.c b/lib/compat.c
index 6d4dece..cab6cbf 100644
--- a/lib/compat.c
+++ b/lib/compat.c
@@ -15,7 +15,7 @@
     support version symboling
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_i.h"
 #include "fuse_misc.h"
 #include "fuse_opt.h"
diff --git a/lib/cuse_lowlevel.c b/lib/cuse_lowlevel.c
index 01a62ab..cd68787 100644
--- a/lib/cuse_lowlevel.c
+++ b/lib/cuse_lowlevel.c
@@ -7,7 +7,7 @@
   See the file COPYING.LIB.
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "cuse_lowlevel.h"
 #include "fuse_kernel.h"
 #include "fuse_i.h"
diff --git a/lib/fuse.c b/lib/fuse.c
index 9834f75..a247d3c 100644
--- a/lib/fuse.c
+++ b/lib/fuse.c
@@ -13,7 +13,7 @@
 /* For pthread_rwlock_t */
 #define _GNU_SOURCE
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_i.h"
 #include "fuse_lowlevel.h"
 #include "fuse_opt.h"
diff --git a/lib/fuse_loop.c b/lib/fuse_loop.c
index e6560aa..b9c498b 100644
--- a/lib/fuse_loop.c
+++ b/lib/fuse_loop.c
@@ -8,7 +8,7 @@
   See the file COPYING.LIB
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_lowlevel.h"
 #include "fuse_i.h"
 
diff --git a/lib/fuse_loop_mt.c b/lib/fuse_loop_mt.c
index b8b2fdd..cf9ad86 100644
--- a/lib/fuse_loop_mt.c
+++ b/lib/fuse_loop_mt.c
@@ -8,7 +8,7 @@
   See the file COPYING.LIB.
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_lowlevel.h"
 #include "fuse_misc.h"
 #include "fuse_kernel.h"
diff --git a/lib/fuse_lowlevel.c b/lib/fuse_lowlevel.c
index 8fe47db..fcc2108 100644
--- a/lib/fuse_lowlevel.c
+++ b/lib/fuse_lowlevel.c
@@ -11,7 +11,7 @@
 
 #define _GNU_SOURCE
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_i.h"
 #include "fuse_kernel.h"
 #include "fuse_opt.h"
diff --git a/lib/fuse_opt.c b/lib/fuse_opt.c
index 93066b9..1d3b6a1 100644
--- a/lib/fuse_opt.c
+++ b/lib/fuse_opt.c
@@ -9,7 +9,7 @@
   See the file COPYING.LIB
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_i.h"
 #include "fuse_opt.h"
 #include "fuse_misc.h"
diff --git a/lib/fuse_signals.c b/lib/fuse_signals.c
index 4271947..048d047 100644
--- a/lib/fuse_signals.c
+++ b/lib/fuse_signals.c
@@ -8,7 +8,7 @@
   See the file COPYING.LIB
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_lowlevel.h"
 #include "fuse_i.h"
 
diff --git a/lib/helper.c b/lib/helper.c
index c3796c1..b270b85 100644
--- a/lib/helper.c
+++ b/lib/helper.c
@@ -10,7 +10,7 @@
   See the file COPYING.LIB.
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_i.h"
 #include "fuse_misc.h"
 #include "fuse_opt.h"
diff --git a/lib/modules/iconv.c b/lib/modules/iconv.c
index 0ec3c2b..3d18a36 100644
--- a/lib/modules/iconv.c
+++ b/lib/modules/iconv.c
@@ -6,7 +6,7 @@
   See the file COPYING.LIB
 */
 
-#include <config.h>
+#include <fuse_config.h>
 
 #include <fuse.h>
 #include <stdio.h>
diff --git a/lib/modules/subdir.c b/lib/modules/subdir.c
index 616c0ee..e92eb62 100644
--- a/lib/modules/subdir.c
+++ b/lib/modules/subdir.c
@@ -6,7 +6,7 @@
   See the file COPYING.LIB
 */
 
-#include <config.h>
+#include <fuse_config.h>
 
 #include <fuse.h>
 #include <stdio.h>
diff --git a/lib/mount.c b/lib/mount.c
index 484bf40..bda3c47 100644
--- a/lib/mount.c
+++ b/lib/mount.c
@@ -8,7 +8,7 @@
   See the file COPYING.LIB.
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "fuse_i.h"
 #include "fuse_misc.h"
 #include "fuse_opt.h"
diff --git a/lib/mount_util.c b/lib/mount_util.c
index 35e9948..daf7b5e 100644
--- a/lib/mount_util.c
+++ b/lib/mount_util.c
@@ -8,7 +8,7 @@
   See the file COPYING.LIB.
 */
 
-#include "config.h"
+#include "fuse_config.h"
 #include "mount_util.h"
 #include <stdio.h>
 #include <unistd.h>
diff --git a/meson.build b/meson.build
index d1b2ae0..0057c11 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('libfuse3', ['c'], version: '3.13.0',
-        meson_version: '>= 0.42',
+        meson_version: '>= 0.50',
         default_options: [
             'buildtype=debugoptimized',
             'cpp_std=c++11',
@@ -141,8 +141,8 @@ else
 endif
 
 # Write the test results into config.h (stored in build directory)
-configure_file(output: 'config.h',
-               configuration : cfg)
+configure_file(output: 'fuse_config.h',
+               configuration : cfg, install: true, install_dir: 'include/fuse3')
 
 # '.' will refer to current build directory, which contains config.h
 include_dirs = include_directories('include', 'lib', '.')
@@ -169,3 +169,4 @@ endif
 foreach n : subdirs
     subdir(n)
 endforeach
+
diff --git a/test/test_setattr.c b/test/test_setattr.c
index fa7c8ba..8575203 100644
--- a/test/test_setattr.c
+++ b/test/test_setattr.c
@@ -9,7 +9,7 @@
 
 #define FUSE_USE_VERSION 30
 
-#include <config.h>
+#include <fuse_config.h>
 #include <fuse_lowlevel.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/test/test_syscalls.c b/test/test_syscalls.c
index c835661..2ba55de 100644
--- a/test/test_syscalls.c
+++ b/test/test_syscalls.c
@@ -1,5 +1,5 @@
 #define _GNU_SOURCE
-#include "config.h"
+#include "fuse_config.h"
 
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/test/test_write_cache.c b/test/test_write_cache.c
index 03ccc98..bc62ac1 100644
--- a/test/test_write_cache.c
+++ b/test/test_write_cache.c
@@ -9,7 +9,7 @@
 
 #define FUSE_USE_VERSION 30
 
-#include <config.h>
+#include <fuse_config.h>
 #include <fuse_lowlevel.h>
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/test/travis-install.sh b/test/travis-install.sh
index 65360b4..924623b 100755
--- a/test/travis-install.sh
+++ b/test/travis-install.sh
@@ -4,7 +4,7 @@ set -e
 
 sudo python3 -m pip install --upgrade pip
 # Meson 0.45 requires Python 3.5 or newer
-sudo python3 -m pip install pytest meson==0.44
+sudo python3 -m pip install pytest meson==0.50
 valgrind --version
 ninja --version
 meson --version
diff --git a/util/fusermount.c b/util/fusermount.c
index ed62ea9..50989eb 100644
--- a/util/fusermount.c
+++ b/util/fusermount.c
@@ -8,7 +8,7 @@
 /* This program does the mounting and unmounting of FUSE filesystems */
 
 #define _GNU_SOURCE /* for clone */
-#include "config.h"
+#include "fuse_config.h"
 #include "mount_util.h"
 
 #include <stdio.h>
diff --git a/util/mount.fuse.c b/util/mount.fuse.c
index a6e5629..04d63b2 100644
--- a/util/mount.fuse.c
+++ b/util/mount.fuse.c
@@ -6,7 +6,7 @@
   See the file COPYING.
 */
 
-#include "config.h"
+#include "fuse_config.h"
 
 #include <stdio.h>
 #include <stdlib.h>