From: Thomas Monjalon <thomas@monjalon.net>
Date: Mon, 16 Mar 2020 12:04:53 +0000 (+0100)
Subject: eal: fix compiler detection in public headers
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=0c9a5735a9479e8b6c05580efdbd15ae00869edf;p=dpdk.git

eal: fix compiler detection in public headers

RTE_TOOLCHAIN_* macros are defining the target compiler.
Some API may be used in a host application like pmdinfogen.
That's why the the public headers should check the effective compiler
in use instead of the target compiler.

Detecting the compiler with macros is easy, except for __GNUC__
which is defined in all compilers supporting some GNU compatibility.

It is improved by defining RTE_CC_CLANG, RTE_CC_ICC and RTE_CC_GCC.
The extra macro RTE_CC_IS_GNU is defined to 0 or 1 in GCC case,
so it can be used simply with #if.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
---

diff --git a/lib/librte_eal/common/include/arch/arm/rte_memcpy_64.h b/lib/librte_eal/common/include/arch/arm/rte_memcpy_64.h
index beb97a71ef..85ad587bd3 100644
--- a/lib/librte_eal/common/include/arch/arm/rte_memcpy_64.h
+++ b/lib/librte_eal/common/include/arch/arm/rte_memcpy_64.h
@@ -89,7 +89,7 @@ n <= (size_t)RTE_ARM64_MEMCPY_UNALIGNED_THRESHOLD)
  **************************************/
 
 
-#if defined(RTE_TOOLCHAIN_GCC) && !defined(RTE_ARM64_MEMCPY_SKIP_GCC_VER_CHECK)
+#if RTE_CC_IS_GNU && !defined RTE_ARM64_MEMCPY_SKIP_GCC_VER_CHECK
 #if (GCC_VERSION < 50400)
 #warning "The GCC version is quite old, which may result in sub-optimal \
 performance of the compiled code. It is suggested that at least GCC 5.4.0 \
diff --git a/lib/librte_eal/common/include/arch/arm/rte_vect.h b/lib/librte_eal/common/include/arch/arm/rte_vect.h
index 2a18a68546..454ac7e578 100644
--- a/lib/librte_eal/common/include/arch/arm/rte_vect.h
+++ b/lib/librte_eal/common/include/arch/arm/rte_vect.h
@@ -62,7 +62,7 @@ vaddvq_u16(uint16x8_t a)
 
 #endif
 
-#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70000)
+#if RTE_CC_IS_GNU && (GCC_VERSION < 70000)
 static inline uint32x4_t
 vcopyq_laneq_u32(uint32x4_t a, const int lane_a,
 		 uint32x4_t b, const int lane_b)
@@ -72,7 +72,7 @@ vcopyq_laneq_u32(uint32x4_t a, const int lane_a,
 #endif
 
 #if defined(RTE_ARCH_ARM64)
-#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION < 70000)
+#if RTE_CC_IS_GNU && (GCC_VERSION < 70000)
 
 #if (GCC_VERSION < 40900)
 typedef uint64_t poly64_t;
diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h
index 3662545d20..17f2d0291f 100644
--- a/lib/librte_eal/common/include/rte_common.h
+++ b/lib/librte_eal/common/include/rte_common.h
@@ -42,8 +42,23 @@ extern "C" {
 #define RTE_STD_C11
 #endif
 
-/** Define GCC_VERSION **/
-#ifdef RTE_TOOLCHAIN_GCC
+/*
+ * RTE_TOOLCHAIN_GCC is defined if the target is built with GCC,
+ * while a host application (like pmdinfogen) may have another compiler.
+ * RTE_CC_IS_GNU is true if the file is compiled with GCC,
+ * no matter it is a target or host application.
+ */
+#define RTE_CC_IS_GNU 0
+#if defined __clang__
+#define RTE_CC_CLANG
+#elif defined __INTEL_COMPILER
+#define RTE_CC_ICC
+#elif defined __GNUC__
+#define RTE_CC_GCC
+#undef RTE_CC_IS_GNU
+#define RTE_CC_IS_GNU 1
+#endif
+#if RTE_CC_IS_GNU
 #define GCC_VERSION (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 +	\
 		__GNUC_PATCHLEVEL__)
 #endif
diff --git a/lib/librte_table/rte_lru_x86.h b/lib/librte_table/rte_lru_x86.h
index 7a67ee8bd5..0e24906c2c 100644
--- a/lib/librte_table/rte_lru_x86.h
+++ b/lib/librte_table/rte_lru_x86.h
@@ -19,7 +19,7 @@ extern "C" {
 
 #if RTE_TABLE_HASH_LRU_STRATEGY == 2
 
-#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION > 40306)
+#if RTE_CC_IS_GNU && (GCC_VERSION > 40306)
 #include <x86intrin.h>
 #else
 #include <emmintrin.h>
@@ -63,7 +63,7 @@ do {									\
 
 #elif RTE_TABLE_HASH_LRU_STRATEGY == 3
 
-#if defined(RTE_TOOLCHAIN_GCC) && (GCC_VERSION > 40306)
+#if RTE_CC_IS_GNU && (GCC_VERSION > 40306)
 #include <x86intrin.h>
 #else
 #include <emmintrin.h>