The naive time(0) seed is unique only within one second. Instead try to
read a real source of entropy and otherwise fall back to a combination
of the process id and high-resolution time.
Under Windows "locationURI" must be used for virtual folders, while
"location" must be used only for linked folders. Under Linux it doesn't
seem to matter.
Alex
08b9397 find_package: Fix system package registry test path conversion
93021ad find_package: Test system package registry when possible
b95f3ca find_package: Check both 32-bit and 64-bit registry views
a0d76c1 find_package: Search a "system package registry"
549458f find_package: Document user package registry locations
c9563db find_package: Cleanup user package registry less aggressively
4df1197 find_package: Rename implementation of user package registry
08fa5dd Also generate dependers-graphviz files.
4f96a76 GRAPHVIZ_IGNORE_TARGETS is now a list of regular expressions
5698ad2 Make it possible to exlude external libs from dot files
The system package registry is under HKEY_LOCAL_MACHINE\SOFTWARE which
has separate views for 32-bit and 64-bit applications. Look in both
views, but prefer the architecture matching the build target platform.
Generalize the "user package registry" created by commit ed0650f6 (Teach
find_package to search a "package registry", 2009-09-01). Define a
corresponding "system" registry key under HKEY_LOCAL_MACHINE. This
gives package installers a place to create a registry value that points
at the right location for find_package() to locate the package.
Delete only REG_SZ entries that are specifically detected to point to
invalid paths. This will allow future versions to add other value types
for different purposes.
