From 39c55a118f778c6120cdfca40689a7411ce9e6a4 Mon Sep 17 00:00:00 2001
From: Yann Collet <cyan@fb.com>
Date: Thu, 30 Aug 2018 15:54:14 -0700
Subject: [PATCH] fixed minor compatibility issues with older compilers

---
 contrib/largeNbDicts/Makefile       |  2 +-
 contrib/largeNbDicts/largeNbDicts.c |  5 ++---
 programs/util.h                     | 10 ++++++----
 3 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/contrib/largeNbDicts/Makefile b/contrib/largeNbDicts/Makefile
index 0514e3d82..05b54fd35 100644
--- a/contrib/largeNbDicts/Makefile
+++ b/contrib/largeNbDicts/Makefile
@@ -15,7 +15,7 @@ LIBZSTD = $(LIBDIR)/libzstd.a
 CPPFLAGS+= -I$(LIBDIR) -I$(LIBDIR)/common -I$(LIBDIR)/dictBuilder -I$(PROGDIR)
 
 CFLAGS  ?= -O3
-CFLAGS  += -std=c99
+CFLAGS  += -std=gnu99
 DEBUGFLAGS= -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \
             -Wstrict-aliasing=1 -Wswitch-enum \
             -Wstrict-prototypes -Wundef -Wpointer-arith -Wformat-security \
diff --git a/contrib/largeNbDicts/largeNbDicts.c b/contrib/largeNbDicts/largeNbDicts.c
index 5b982bd42..0c5f89a8e 100644
--- a/contrib/largeNbDicts/largeNbDicts.c
+++ b/contrib/largeNbDicts/largeNbDicts.c
@@ -50,6 +50,8 @@
 
 /*---  Macros  ---*/
 #define CONTROL(c)   assert(c)
+#undef MIN
+#define MIN(a,b)   ((a) < (b) ? (a) : (b))
 
 
 /*---  Display Macros  ---*/
@@ -472,9 +474,6 @@ static size_t compressBlocks(size_t* cSizes,   /* optional (can be NULL). If pre
 
 /* ---  Benchmark  --- */
 
-typedef size_t (*BMK_benchFn_t)(const void* src, size_t srcSize, void* dst, size_t dstCapacity, void* customPayload);
-typedef size_t (*BMK_initFn_t)(void* initPayload);
-
 typedef struct {
     ZSTD_DCtx* dctx;
     size_t nbDicts;
diff --git a/programs/util.h b/programs/util.h
index 76000d991..88d048409 100644
--- a/programs/util.h
+++ b/programs/util.h
@@ -319,15 +319,17 @@ UTIL_STATIC U32 UTIL_isDirectory(const char* infilename)
 
 UTIL_STATIC U32 UTIL_isLink(const char* infilename)
 {
-#if defined(_WIN32)
-    /* no symlinks on windows */
-    (void)infilename;
-#else
+/* macro guards, as defined in : https://linux.die.net/man/2/lstat */
+#if defined(_BSD_SOURCE) \
+    || (defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE >= 500)) \
+    || (defined(_XOPEN_SOURCE) && defined(_XOPEN_SOURCE_EXTENDED)) \
+    || (defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200112L))
     int r;
     stat_t statbuf;
     r = lstat(infilename, &statbuf);
     if (!r && S_ISLNK(statbuf.st_mode)) return 1;
 #endif
+    (void)infilename;
     return 0;
 }