tr2: make process info collection platform-generic

To pave the way for non-Windows platforms to define
trace2_collect_process_info(), reorganize the stub-or-definition schema
to something which doesn't directly reference Windows.

Platforms which want to collect parent process information in the
future should:

 1. Add an implementation to compat/ (e.g. compat/somearch/procinfo.c)
 2. Add that object to COMPAT_OBJS to config.mak.uname
    (e.g. COMPAT_OBJS += compat/somearch/procinfo.o)
 3. Define HAVE_PLATFORM_PROCINFO in config.mak.uname

In the Windows case, this definition lives in
compat/win32/trace2_win32_process_info.c, which is already conditionally
added to COMPAT_OBJS; so let's add HAVE_PLATFORM_PROCINFO to hint to the
build that compat/stub/procinfo.c should not be used.

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
Helped-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/trace2.h b/trace2.h
index ede18c2e06..0d990db817 100644
--- a/trace2.h
+++ b/trace2.h
@@ -492,13 +492,7 @@ enum trace2_process_info_reason {
 	TRACE2_PROCESS_INFO_EXIT,
 };
 
-#if defined(GIT_WINDOWS_NATIVE)
 void trace2_collect_process_info(enum trace2_process_info_reason reason);
-#else
-#define trace2_collect_process_info(reason) \
-	do {                                \
-	} while (0)
-#endif
 
 const char *trace2_session_id(void);