From: Thierry Reding treding@nvidia.com
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.
Signed-off-by: Thierry Reding treding@nvidia.com --- Changes in v3: - distribute libdrm.h
Makefile.am | 1 + configure.ac | 20 ++++++++++++++++++++ libdrm.h | 34 ++++++++++++++++++++++++++++++++++ 3 files changed, 55 insertions(+) create mode 100644 libdrm.h
diff --git a/Makefile.am b/Makefile.am index 826c30d0c0d9..65680da963eb 100644 --- a/Makefile.am +++ b/Makefile.am @@ -69,6 +69,7 @@ libdrm_la_SOURCES = \ xf86drmSL.c \ xf86drmMode.c \ xf86atomic.h \ + libdrm.h \ libdrm_lists.h
libdrmincludedir = ${includedir} diff --git a/configure.ac b/configure.ac index 1c78c4520c49..f7c7177bfb2a 100644 --- a/configure.ac +++ b/configure.ac @@ -366,6 +366,26 @@ AC_ARG_WITH([kernel-source], [kernel_source="$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 diff --git a/libdrm.h b/libdrm.h new file mode 100644 index 000000000000..23926e6f6741 --- /dev/null +++ b/libdrm.h @@ -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