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configure: Support symbol visibility when available 

Checks whether or not the compiler supports the -fvisibility option. If
so it sets the VISIBILITY_CFLAGS variable which can be added to the per
directory AM_CFLAGS where appropriate.

By default all symbols will be hidden via the VISIBILITY_CFLAGS. The
drm_public macro can be used to mark symbols that should be exported.

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
main
Thierry Reding 2014-02-19 15:56:50 +01:00
parent d6861609b2
commit 5d8357976a
3 changed files with 55 additions and 0 deletions
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1
Makefile.am
View File

@ -69,6 +69,7 @@ libdrm_la_SOURCES = \
xf86drmSL.c \
xf86drmMode.c \
xf86atomic.h \
libdrm.h \
libdrm_lists.h
libdrmincludedir = ${includedir}

20
configure.ac
View File

@ -366,6 +366,26 @@ AC_ARG_WITH([kernel-source],
[kernel_source="$with_kernel_source"])
AC_SUBST(kernel_source)
dnl Add flags for gcc and g++
if test "x$GCC" = xyes; then
# Enable -fvisibility=hidden if using a gcc that supports it
save_CFLAGS="$CFLAGS"
AC_MSG_CHECKING([whether $CC supports -fvisibility=hidden])
VISIBILITY_CFLAGS="-fvisibility=hidden"
CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]),
[VISIBILITY_CFLAGS=""; AC_MSG_RESULT([no])]);
# Restore CFLAGS; VISIBILITY_CFLAGS are added to it where needed.
CFLAGS=$save_CFLAGS
if test "x$VISIBILITY_CFLAGS" != x; then
AC_DEFINE(HAVE_VISIBILITY, 1, [Compiler has -fvisibility support])
fi
AC_SUBST([VISIBILITY_CFLAGS])
fi
AC_SUBST(WARN_CFLAGS)
AC_CONFIG_FILES([
Makefile

34
libdrm.h Normal file
View File

@ -0,0 +1,34 @@
/*
* Copyright © 2014 NVIDIA Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef LIBDRM_LIBDRM_H
#define LIBDRM_LIBDRM_H
#if defined(HAVE_VISIBILITY)
# define drm_private __attribute__((visibility("hidden")))
# define drm_public __attribute__((visibility("default")))
#else
# define drm_private
# define drm_public
#endif
#endif