From 7a01a09fe70dec20ea439ed3639e327a03e54d68 Mon Sep 17 00:00:00 2001
From: Rosen Penev <rosenp@gmail.com>
Date: Sun, 5 Jul 2020 14:41:40 -0700
Subject: [PATCH] libpng: fix compilation with ccache

It seems an extra CMake variable is needed for one of the scripts.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 libs/libpng/Makefile                 |  2 +-
 libs/libpng/patches/200-ccache.patch | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 libs/libpng/patches/200-ccache.patch

diff --git a/libs/libpng/Makefile b/libs/libpng/Makefile
index 93736985ee..7e0bea5d70 100644
--- a/libs/libpng/Makefile
+++ b/libs/libpng/Makefile
@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libpng
 PKG_VERSION:=1.6.37
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@SF/libpng
diff --git a/libs/libpng/patches/200-ccache.patch b/libs/libpng/patches/200-ccache.patch
new file mode 100644
index 0000000000..25de329476
--- /dev/null
+++ b/libs/libpng/patches/200-ccache.patch
@@ -0,0 +1,19 @@
+--- a/scripts/genout.cmake.in
++++ b/scripts/genout.cmake.in
+@@ -14,6 +14,7 @@ set(BINDIR "@CMAKE_CURRENT_BINARY_DIR@")
+ 
+ set(AWK "@AWK@")
+ set(CMAKE_C_COMPILER "@CMAKE_C_COMPILER@")
++set(CMAKE_C_COMPILER_ARG1 "@CMAKE_C_COMPILER_ARG1@")
+ set(CMAKE_C_FLAGS @CMAKE_C_FLAGS@)
+ set(INCDIR "@CMAKE_CURRENT_BINARY_DIR@")
+ set(PNG_PREFIX "@PNG_PREFIX@")
+@@ -58,7 +59,7 @@ if ("${INPUTEXT}" STREQUAL ".c" AND "${OUTPUTEXT}" STREQUAL ".out")
+     set(PNG_PREFIX_DEF "-DPNG_PREFIX=${PNG_PREFIX}")
+   endif()
+ 
+-  execute_process(COMMAND "${CMAKE_C_COMPILER}" "-E"
++  execute_process(COMMAND "${CMAKE_C_COMPILER}" ${CMAKE_C_COMPILER_ARG1} "-E"
+                           ${CMAKE_C_FLAGS}
+                           ${PLATFORM_C_FLAGS}
+                           "-I${SRCDIR}"