From 681d5010d53cc2631ad96afa5dfc7ea70f13e5de Mon Sep 17 00:00:00 2001
From: Georg Sauthoff <mail@georg.so>
Date: Sat, 27 Aug 2016 10:47:50 +0200
Subject: use gnu c99 to get both c99 and POSIX

when compiling with gcc

fixes fileno() implicitly defined on Linx and compile error on Solaris 10
---
 cmake_unofficial/CMakeLists.txt | 22 ++++++++++++----------
 examples/Makefile               |  2 +-
 lib/Makefile                    |  2 +-
 3 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/cmake_unofficial/CMakeLists.txt b/cmake_unofficial/CMakeLists.txt
index 3f113b1..af39cb0 100644
--- a/cmake_unofficial/CMakeLists.txt
+++ b/cmake_unofficial/CMakeLists.txt
@@ -92,21 +92,23 @@ endif()
 #warnings
 
 if(MSVC)
-ADD_DEFINITIONS("-W4")
+    ADD_DEFINITIONS("-W4")
 endif()
 if(GNU_COMPATIBLE_COMPILER)
-ADD_DEFINITIONS("-Wall")
+    ADD_DEFINITIONS("-Wall")
 endif()
 if(CMAKE_COMPILER_IS_GNUCXX)
-ADD_DEFINITIONS("-Wextra")
-ADD_DEFINITIONS("-Wundef")
-ADD_DEFINITIONS("-Wshadow")
-ADD_DEFINITIONS("-Wcast-align")
-ADD_DEFINITIONS("-Wstrict-prototypes")
+    ADD_DEFINITIONS("-Wextra")
+    ADD_DEFINITIONS("-Wundef")
+    ADD_DEFINITIONS("-Wshadow")
+    ADD_DEFINITIONS("-Wcast-align")
+    ADD_DEFINITIONS("-Wstrict-prototypes")
 endif(CMAKE_COMPILER_IS_GNUCXX)
-if(GNU_COMPATIBLE_COMPILER AND
-   (NOT CMAKE_SYSTEM_NAME MATCHES "SunOS"))
-ADD_DEFINITIONS("-std=c99")
+if(GNU_COMPATIBLE_COMPILER)
+    # we need gnu99 instead of c99 on Linux and Solaris
+    # to get C99 and POSIX definitions
+    # an alternative with cmake >= 3.1/3.2 is the C_STANDARD property
+    ADD_DEFINITIONS("-std=gnu99")
 endif()
 ADD_DEFINITIONS("-DLZ4_VERSION=\"${CPACK_PACKAGE_VERSION_PATCH}\"")
 INCLUDE_DIRECTORIES (${LZ4_DIR})
diff --git a/examples/Makefile b/examples/Makefile
index 1e4f075..c8caf24 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -28,7 +28,7 @@
 # ##########################################################################
 
 CFLAGS ?= -O3
-CFLAGS += -std=c99 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wstrict-prototypes
+CFLAGS += -std=gnu99 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wstrict-prototypes
 FLAGS  := -I../lib $(CPPFLAGS) $(CFLAGS) $(LDFLAGS)
 
 TESTFILE= Makefile
diff --git a/lib/Makefile b/lib/Makefile
index 879d2b3..52e0f95 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -41,7 +41,7 @@ DESTDIR?=
 PREFIX ?= /usr/local
 CPPFLAGS= -DXXH_NAMESPACE=LZ4_
 CFLAGS ?= -O3
-CFLAGS += -std=c99 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wcast-qual -Wstrict-prototypes -pedantic
+CFLAGS += -std=gnu99 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wcast-qual -Wstrict-prototypes -pedantic
 FLAGS   = $(CPPFLAGS) $(CFLAGS) $(LDFLAGS)
 
 LIBDIR?= $(PREFIX)/lib
-- 
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