runtime: make more build-friendly
Collapse the arch,os-specific directories into the main directory
by renaming xxx/foo.c to foo_xxx.c, and so on.
There are no substantial edits here, except to the Makefile.
The assumption is that the Go tool will #define GOOS_darwin
and GOARCH_amd64 and will make any file named something
like signals_darwin.h available as signals_GOOS.h during the
build. This replaces what used to be done with -I$(GOOS).
There is still work to be done to make runtime build with
standard tools, but this is a big step. After this we will have
to write a script to generate all the generated files so they
can be checked in (instead of generated during the build).
R=r, iant, r, lucio.dere
CC=golang-dev
https://golang.org/cl/5490053
diff --git a/src/pkg/runtime/stack.h b/src/pkg/runtime/stack.h
index 4832338..f56dac1 100644
--- a/src/pkg/runtime/stack.h
+++ b/src/pkg/runtime/stack.h
@@ -57,7 +57,7 @@
// to each stack below the usual guard area for OS-specific
// purposes like signal handling. Used on Windows because
// it does not use a separate stack.
-#ifdef __WINDOWS__
+#ifdef GOOS_windows
StackSystem = 512 * sizeof(uintptr),
#else
StackSystem = 0,
