tree 143541563f86ca537404419290627570639b4df2
parent 4d90c3b593a79727a5bb19b8cb4d58643b057551
author Martin Storsjö <martin@martin.st> 1671026240 +0200
committer Martin Storsjö <martin@martin.st> 1671642301 +0200

widl: Avoid conflicting definitions of __fastfail from Wine's winnt.h

Widl uses a subset of Wine headers, on top of the host's platform
headers (either Unix or Windows ones). When building widl for a
Windows target, the included Wine headers end up being preferred
over the toolchain's own platform headers.

Wine defines the __fastfail function in the winnt.h header (as
a static inline function), while mingw-w64 headers define it in
_mingw.h as a extern gnu_inline function.

When built with Clang, this combintion of an extern declaration
and static inline, ends up producing extern definitions of the
function in every compilation unit that ends up including both
headers - which ends up as linker errors due to duplicate definitions.
(GCC doesn't seem to produce any extern definitions in these cases.)

Patch the imported winnt.h from Wine, to skip the definition of
__fastfail if __MINGW_FASTFAIL_IMPL is defined (which is set by
_mingw.h).

Signed-off-by: Martin Storsjö <martin@martin.st>