[PATCH v2] eal: provide macro to allocate and name a section or segment

[Tyler Retzlaff]

Provide __rte_section(name) macro that allocates and names a section
or segment that works with both MSVC and GCC.

Update RTE_TRACE_POINT_REGISTER with __rte_section("__rte_trace_point")
instead of __attribute__(section(name)) so the macro may be compatibly
expanded when using MSVC.

Signed-off-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
---

v2:
    * Define an internal macro __rte_section for the trace point
      allocation and use it in RTE_TRACE_POINT_REGISTER instead of
      duplicating original macro expansion for MSVC.

 lib/eal/include/rte_common.h               | 11 +++++++++++
 lib/eal/include/rte_trace_point_register.h |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/lib/eal/include/rte_common.h b/lib/eal/include/rte_common.h
index c1ba32d..612f87b 100644
--- a/lib/eal/include/rte_common.h
+++ b/lib/eal/include/rte_common.h
@@ -178,6 +178,17 @@
 #endif
 
 /**
+ * specify data or function section/segment
+ */
+#ifdef RTE_TOOLCHAIN_MSVC
+#define __rte_section(name) \
+	__pragma(data_seg(name)) __declspec(allocate(name))
+#else
+#define __rte_section(name) \
+	__attribute__((section(name)))
+#endif
+
+/**
  * Tells compiler that the function returns a value that points to
  * memory, where the size is given by the one or two arguments.
  * Used by compiler to validate object size.
diff --git a/lib/eal/include/rte_trace_point_register.h b/lib/eal/include/rte_trace_point_register.h
index a9682d3..41260e5 100644
--- a/lib/eal/include/rte_trace_point_register.h
+++ b/lib/eal/include/rte_trace_point_register.h
@@ -19,7 +19,7 @@
 RTE_DECLARE_PER_LCORE(volatile int, trace_point_sz);
 
 #define RTE_TRACE_POINT_REGISTER(trace, name) \
-rte_trace_point_t __attribute__((section("__rte_trace_point"))) __##trace; \
+rte_trace_point_t __rte_section("__rte_trace_point") __##trace; \
 static const char __##trace##_name[] = RTE_STR(name); \
 RTE_INIT(trace##_init) \
 { \
-- 
1.8.3.1