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
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@ -69,6 +69,7 @@ libdrm_la_SOURCES = \
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xf86drmSL.c \
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xf86drmSL.c \
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xf86drmMode.c \
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xf86drmMode.c \
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xf86atomic.h \
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xf86atomic.h \
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libdrm.h \
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libdrm_lists.h
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libdrm_lists.h
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libdrmincludedir = ${includedir}
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libdrmincludedir = ${includedir}
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20
configure.ac
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configure.ac
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@ -366,6 +366,26 @@ AC_ARG_WITH([kernel-source],
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[kernel_source="$with_kernel_source"])
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[kernel_source="$with_kernel_source"])
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AC_SUBST(kernel_source)
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AC_SUBST(kernel_source)
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dnl Add flags for gcc and g++
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if test "x$GCC" = xyes; then
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# Enable -fvisibility=hidden if using a gcc that supports it
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save_CFLAGS="$CFLAGS"
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AC_MSG_CHECKING([whether $CC supports -fvisibility=hidden])
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VISIBILITY_CFLAGS="-fvisibility=hidden"
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CFLAGS="$CFLAGS $VISIBILITY_CFLAGS"
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AC_LINK_IFELSE([AC_LANG_PROGRAM()], AC_MSG_RESULT([yes]),
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[VISIBILITY_CFLAGS=""; AC_MSG_RESULT([no])]);
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# Restore CFLAGS; VISIBILITY_CFLAGS are added to it where needed.
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CFLAGS=$save_CFLAGS
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if test "x$VISIBILITY_CFLAGS" != x; then
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AC_DEFINE(HAVE_VISIBILITY, 1, [Compiler has -fvisibility support])
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fi
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AC_SUBST([VISIBILITY_CFLAGS])
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fi
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AC_SUBST(WARN_CFLAGS)
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AC_SUBST(WARN_CFLAGS)
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AC_CONFIG_FILES([
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AC_CONFIG_FILES([
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Makefile
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Makefile
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@ -0,0 +1,34 @@
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/*
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* Copyright © 2014 NVIDIA Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#ifndef LIBDRM_LIBDRM_H
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#define LIBDRM_LIBDRM_H
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#if defined(HAVE_VISIBILITY)
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# define drm_private __attribute__((visibility("hidden")))
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# define drm_public __attribute__((visibility("default")))
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#else
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# define drm_private
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# define drm_public
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#endif
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#endif
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