Rework symbol visibility for easier maintenance

  Save in a few special cases, _X_EXPORT should not be used in C source
files. Instead, it should be used in headers, and the proper C source
include that header. Some special cases are symbols that need to be
shared between modules, but not expected to be used by external drivers,
and symbols that are accessible via LoaderSymbol/dlopen.

  This patch also adds conditionally some new sdk header files, depending
on extensions enabled. These files were added to match pattern for
other extensions/modules, that is, have the headers "deciding" symbol
visibility in the sdk. These headers are:
o Xext/panoramiXsrv.h, Xext/panoramiX.h
o fbpict.h (unconditionally)
o vidmodeproc.h
o mioverlay.h (unconditionally, used only by xaa)
o xfixes.h (unconditionally, symbols required by dri2)

  LoaderSymbol and similar functions now don't have different prototypes,
in loaderProcs.h and xf86Module.h, so that both headers can be included,
without the need of defining IN_LOADER.

  xf86NewInputDevice() device prototype readded to xf86Xinput.h, but
not exported (and with a comment about it).

1 files changed, 3 insertions, 3 deletions

diff --git a/os/backtrace.c b/os/backtrace.c
index e51b93043..b52dcded8 100644
--- a/os/backtrace.c
+++ b/os/backtrace.c
@@ -30,7 +30,7 @@
 #ifdef HAVE_BACKTRACE
 #include <execinfo.h>
 
-_X_EXPORT void xorg_backtrace(void)
+void xorg_backtrace(void)
 {
     void *array[32]; /* deeper nesting than this means something's wrong */
     size_t size, i;
@@ -168,7 +168,7 @@ static int xorg_backtrace_pstack(void) {
 
 # if defined(HAVE_PSTACK) || defined(HAVE_WALKCONTEXT)
 
-_X_EXPORT void xorg_backtrace(void) {
+void xorg_backtrace(void) {
 
     ErrorF("\nBacktrace:\n");
 
@@ -195,7 +195,7 @@ _X_EXPORT void xorg_backtrace(void) {
 # else
 
 /* Default fallback if we can't find any way to get a backtrace */
-_X_EXPORT void xorg_backtrace(void) { return; }
+void xorg_backtrace(void) { return; }
 
 # endif
 #endif