From db94dfb1d5ec08777918352bbf6c65666d2e09b7 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Mon, 23 Apr 2018 21:55:59 -0700
Subject: [PATCH] Fixed bug 4144 - CMake complains about trailing spaces in
 sdl2.pc

 Azamat H. Hackimov

When you try use SDL2 2.0.8 in CMake project in Linux, it complains about trailing spaces in sdl2.pc:

CMake Error at CMakeLists.txt:147 (add_executable):
  Target "TestSimpleMain" links to item "-L/usr/lib64 -lSDL2 " which has
  leading or trailing whitespace.  This is now an error according to policy
  CMP0004.
---
 configure    | 15 +++++++++++----
 configure.in | 15 +++++++++++----
 2 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/configure b/configure
index e932dce76cdc4..d8fc074b0fe51 100755
--- a/configure
+++ b/configure
@@ -15752,10 +15752,17 @@ EXTRA_LDFLAGS="$BASE_LDFLAGS"
 #    fi
 #done
 SDL_CFLAGS="$BASE_CFLAGS"
-SDL_LIBS="-lSDL2 $BASE_LDFLAGS"
-CPPFLAGS="$CPPFLAGS $EXTRA_CFLAGS"
-CFLAGS="$CFLAGS $EXTRA_CFLAGS"
-LDFLAGS="$LDFLAGS $EXTRA_LDFLAGS"
+SDL_LIBS="-lSDL2"
+if  "$BASE_LDFLAGS" != "" ; then
+    SDL_LIBS="$SDL_LIBS $BASE_LDFLAGS"
+fi
+if  "$EXTRA_CFLAGS" != "" ; then
+    CPPFLAGS="$CPPFLAGS $EXTRA_CFLAGS"
+    CFLAGS="$CFLAGS $EXTRA_CFLAGS"
+fi
+if  "$EXTRA_LDFLAGS" != "" ; then
+    LDFLAGS="$LDFLAGS $EXTRA_LDFLAGS"
+fi
 
 base_libdir=`echo \${libdir} | sed 's/.*\/\(.*\)/\1/; q'`
 
diff --git a/configure.in b/configure.in
index 9d815dbc3d62b..1b9935c713aac 100644
--- a/configure.in
+++ b/configure.in
@@ -123,10 +123,17 @@ EXTRA_LDFLAGS="$BASE_LDFLAGS"
 #    fi
 #done
 SDL_CFLAGS="$BASE_CFLAGS"
-SDL_LIBS="-lSDL2 $BASE_LDFLAGS"
-CPPFLAGS="$CPPFLAGS $EXTRA_CFLAGS"
-CFLAGS="$CFLAGS $EXTRA_CFLAGS"
-LDFLAGS="$LDFLAGS $EXTRA_LDFLAGS"
+SDL_LIBS="-lSDL2"
+if [ "$BASE_LDFLAGS" != "" ]; then
+    SDL_LIBS="$SDL_LIBS $BASE_LDFLAGS"
+fi
+if [ "$EXTRA_CFLAGS" != "" ]; then
+    CPPFLAGS="$CPPFLAGS $EXTRA_CFLAGS"
+    CFLAGS="$CFLAGS $EXTRA_CFLAGS"
+fi
+if [ "$EXTRA_LDFLAGS" != "" ]; then
+    LDFLAGS="$LDFLAGS $EXTRA_LDFLAGS"
+fi
 
 dnl set this to use on systems that use lib64 instead of lib
 base_libdir=`echo \${libdir} | sed 's/.*\/\(.*\)/\1/; q'`