Upstream maintainers, with few exceptions, generally don't care about
warnings in boost headers, hence we re-base our warning fix patches on
every upgrade, which is a pointless exercise in frustration.
Most of the patches are for GCC/Clang warnings, where we could use
-isystem to suppress the warnings (with corresponding hacks in the build
system, because -isystem also disables dependency generation) - but
clang-cl does not support -isystem.
So generate a bunch of wrapper headers into external/boost/include, that
disable all known warnings and use #include_next to get the real boost
header. This allows us to get rid of most of the existing patches.
There is however a bug in GCC that preprocessor warnings like -Wundef
cannot be disabled with a #pragma, so those patches cannot be removed.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53431
Change-Id: I2992bf4a463015f1140489df867bd80757f84541
Reviewed-on: https://gerrit.libreoffice.org/25563
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>
David Tardon