CMakeLists: Fix style
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7e555db..30d90f7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,19 +16,19 @@
cmake_policy(VERSION 3.0.2)
# Set MacOSX @rpath usage globally.
-if (POLICY CMP0020)
+if(POLICY CMP0020)
cmake_policy(SET CMP0020 NEW)
-endif(POLICY CMP0020)
-if (POLICY CMP0042)
+endif()
+if(POLICY CMP0042)
cmake_policy(SET CMP0042 NEW)
-endif(POLICY CMP0042)
+endif()
# Use new variable expansion policy.
-if (POLICY CMP0053)
+if(POLICY CMP0053)
cmake_policy(SET CMP0053 NEW)
-endif(POLICY CMP0053)
-if (POLICY CMP0054)
+endif()
+if(POLICY CMP0054)
cmake_policy(SET CMP0054 NEW)
-endif(POLICY CMP0054)
+endif()
set(CMAKE_CONFIGURATION_TYPES "Release;Debug;MinSizeRel;RelWithDebInfo")
@@ -45,20 +45,19 @@
# needed packages
-#Allow users to specify location of Zlib,
-# Useful if zlib is being built alongside this as a sub-project
+# Allow users to specify location of Zlib.
+# Useful if zlib is being built alongside this as a sub-project.
option(PNG_BUILD_ZLIB "Custom zlib Location, else find_package is used" OFF)
-IF(NOT PNG_BUILD_ZLIB)
+if(NOT PNG_BUILD_ZLIB)
find_package(ZLIB REQUIRED)
include_directories(${ZLIB_INCLUDE_DIR})
-ENDIF(NOT PNG_BUILD_ZLIB)
+endif()
if(NOT WIN32)
find_library(M_LIBRARY
NAMES m
- PATHS /usr/lib /usr/local/lib
- )
+ PATHS /usr/lib /usr/local/lib)
if(NOT M_LIBRARY)
message(STATUS "math lib 'libm' not found; floating point support disabled")
set(M_LIBRARY "")
@@ -82,6 +81,7 @@
set(DFA_XTRA "" CACHE FILEPATH "File containing extra configuration settings")
if(PNG_HARDWARE_OPTIMIZATIONS)
+
# set definitions and sources for arm
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" OR
CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
@@ -95,7 +95,7 @@
list(FIND PNG_ARM_NEON_POSSIBLE_VALUES ${PNG_ARM_NEON} index)
if(index EQUAL -1)
message(FATAL_ERROR
- " PNG_ARM_NEON must be one of [${PNG_ARM_NEON_POSSIBLE_VALUES}]")
+ "PNG_ARM_NEON must be one of [${PNG_ARM_NEON_POSSIBLE_VALUES}]")
elseif(NOT ${PNG_ARM_NEON} STREQUAL "off")
set(libpng_arm_sources
arm/arm_init.c
@@ -114,7 +114,7 @@
# set definitions and sources for powerpc
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^powerpc*" OR
- CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*" )
+ CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*")
set(PNG_POWERPC_VSX_POSSIBLE_VALUES on off)
set(PNG_POWERPC_VSX "on" CACHE STRING "Enable POWERPC VSX optimizations:
off: disable the optimizations.")
@@ -123,7 +123,7 @@
list(FIND PNG_POWERPC_VSX_POSSIBLE_VALUES ${PNG_POWERPC_VSX} index)
if(index EQUAL -1)
message(FATAL_ERROR
- " PNG_POWERPC_VSX must be one of [${PNG_POWERPC_VSX_POSSIBLE_VALUES}]")
+ "PNG_POWERPC_VSX must be one of [${PNG_POWERPC_VSX_POSSIBLE_VALUES}]")
elseif(NOT ${PNG_POWERPC_VSX} STREQUAL "off")
set(libpng_powerpc_sources
powerpc/powerpc_init.c
@@ -138,7 +138,7 @@
# set definitions and sources for intel
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^i?86" OR
- CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*" )
+ CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*")
set(PNG_INTEL_SSE_POSSIBLE_VALUES on off)
set(PNG_INTEL_SSE "on" CACHE STRING "Enable INTEL_SSE optimizations:
off: disable the optimizations")
@@ -147,7 +147,7 @@
list(FIND PNG_INTEL_SSE_POSSIBLE_VALUES ${PNG_INTEL_SSE} index)
if(index EQUAL -1)
message(FATAL_ERROR
- " PNG_INTEL_SSE must be one of [${PNG_INTEL_SSE_POSSIBLE_VALUES}]")
+ "PNG_INTEL_SSE must be one of [${PNG_INTEL_SSE_POSSIBLE_VALUES}]")
elseif(NOT ${PNG_INTEL_SSE} STREQUAL "off")
set(libpng_intel_sources
intel/intel_init.c
@@ -162,7 +162,7 @@
# set definitions and sources for MIPS
if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
- CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*" )
+ CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*")
set(PNG_MIPS_MSA_POSSIBLE_VALUES on off)
set(PNG_MIPS_MSA "on" CACHE STRING "Enable MIPS_MSA optimizations:
off: disable the optimizations")
@@ -171,7 +171,7 @@
list(FIND PNG_MIPS_MSA_POSSIBLE_VALUES ${PNG_MIPS_MSA} index)
if(index EQUAL -1)
message(FATAL_ERROR
- " PNG_MIPS_MSA must be one of [${PNG_MIPS_MSA_POSSIBLE_VALUES}]")
+ "PNG_MIPS_MSA must be one of [${PNG_MIPS_MSA_POSSIBLE_VALUES}]")
elseif(NOT ${PNG_MIPS_MSA} STREQUAL "off")
set(libpng_mips_sources
mips/mips_init.c
@@ -183,30 +183,33 @@
add_definitions(-DPNG_MIPS_MSA_OPT=0)
endif()
endif()
+
else(PNG_HARDWARE_OPTIMIZATIONS)
+
# set definitions and sources for arm
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^arm" OR
- CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
+ CMAKE_SYSTEM_PROCESSOR MATCHES "^aarch64")
add_definitions(-DPNG_ARM_NEON_OPT=0)
endif()
# set definitions and sources for powerpc
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^powerpc*" OR
- CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*" )
+ CMAKE_SYSTEM_PROCESSOR MATCHES "^ppc64*")
add_definitions(-DPNG_POWERPC_VSX_OPT=0)
endif()
# set definitions and sources for intel
if(CMAKE_SYSTEM_PROCESSOR MATCHES "^i?86" OR
- CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*" )
+ CMAKE_SYSTEM_PROCESSOR MATCHES "^x86_64*")
add_definitions(-DPNG_INTEL_SSE_OPT=0)
endif()
# set definitions and sources for MIPS
if(CMAKE_SYSTEM_PROCESSOR MATCHES "mipsel*" OR
- CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*" )
+ CMAKE_SYSTEM_PROCESSOR MATCHES "mips64el*")
add_definitions(-DPNG_MIPS_MSA_OPT=0)
endif()
+
endif(PNG_HARDWARE_OPTIMIZATIONS)
# SET LIBNAME
@@ -264,17 +267,17 @@
foreach(line ${OUT})
string(REGEX MATCH "^PREFIX=" found_match "${line}")
if(found_match)
- STRING(REGEX REPLACE "^PREFIX=(.*\)" "\\1" prefix "${line}")
+ string(REGEX REPLACE "^PREFIX=(.*\)" "\\1" prefix "${line}")
string(REGEX MATCH "__USER_LABEL_PREFIX__" found_match "${prefix}")
if(found_match)
- STRING(REGEX REPLACE "(.*)__USER_LABEL_PREFIX__(.*)" "\\1\\2" prefix "${prefix}")
+ string(REGEX REPLACE "(.*)__USER_LABEL_PREFIX__(.*)" "\\1\\2" prefix "${prefix}")
endif()
set(SYMBOL_PREFIX "${prefix}")
endif()
endforeach()
- message(STATUS "Symbol prefix: ${SYMBOL_PREFIX}")
- set(SYMBOL_PREFIX "${SYMBOL_PREFIX}" PARENT_SCOPE)
+ message(STATUS "Symbol prefix: ${SYMBOL_PREFIX}")
+ set(SYMBOL_PREFIX "${SYMBOL_PREFIX}" PARENT_SCOPE)
endfunction()
if(UNIX)
@@ -299,11 +302,11 @@
set(oneValueArgs INPUT OUTPUT)
set(multiValueArgs DEPENDS)
cmake_parse_arguments(_GC "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
- if (NOT _GC_INPUT)
- message(FATAL_ERROR "Invalid arguments. generate_out requires input.")
+ if(NOT _GC_INPUT)
+ message(FATAL_ERROR "generate_chk: Missing INPUT argument")
endif()
- if (NOT _GC_OUTPUT)
- message(FATAL_ERROR "Invalid arguments. generate_out requires output.")
+ if(NOT _GC_OUTPUT)
+ message(FATAL_ERROR "generate_chk: Missing OUTPUT argument")
endif()
add_custom_command(OUTPUT "${_GC_OUTPUT}"
@@ -322,11 +325,11 @@
set(oneValueArgs INPUT OUTPUT)
set(multiValueArgs DEPENDS)
cmake_parse_arguments(_GO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
- if (NOT _GO_INPUT)
- message(FATAL_ERROR "Invalid arguments. generate_out requires input.")
+ if(NOT _GO_INPUT)
+ message(FATAL_ERROR "generate_out: Missing INPUT argument")
endif()
- if (NOT _GO_OUTPUT)
- message(FATAL_ERROR "Invalid arguments. generate_out requires output.")
+ if(NOT _GO_OUTPUT)
+ message(FATAL_ERROR "generate_out: Missing OUTPUT argument")
endif()
add_custom_command(OUTPUT "${_GO_OUTPUT}"
@@ -345,8 +348,8 @@
set(oneValueArgs OUTPUT)
set(multiValueArgs DEPENDS)
cmake_parse_arguments(_GSO "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
- if (NOT _GSO_OUTPUT)
- message(FATAL_ERROR "Invalid arguments. generate_source requires output.")
+ if(NOT _GSO_OUTPUT)
+ message(FATAL_ERROR "generate_source: Missing OUTPUT argument")
endif()
add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/${_GSO_OUTPUT}"
@@ -528,7 +531,7 @@
if(MSVC)
add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
-endif(MSVC)
+endif()
if(PNG_DEBUG)
add_definitions(-DPNG_DEBUG)
@@ -608,7 +611,7 @@
message(SEND_ERROR
"No library variant selected to build. "
"Please enable at least one of the following options: "
- " PNG_STATIC, PNG_SHARED, PNG_FRAMEWORK")
+ "PNG_STATIC, PNG_SHARED, PNG_FRAMEWORK")
endif()
if(PNG_SHARED AND WIN32)
@@ -621,11 +624,11 @@
set(multiValueArgs OPTIONS FILES)
cmake_parse_arguments(_PAT "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
- if (NOT _PAT_NAME)
- message(FATAL_ERROR "Invalid arguments. png_add_test requires name.")
+ if(NOT _PAT_NAME)
+ message(FATAL_ERROR "png_add_test: Missing NAME argument")
endif()
- if (NOT _PAT_COMMAND)
- message(FATAL_ERROR "Invalid arguments. png_add_test requires command.")
+ if(NOT _PAT_COMMAND)
+ message(FATAL_ERROR "png_add_test: Missing COMMAND argument")
endif()
set(TEST_OPTIONS "${_PAT_OPTIONS}")
@@ -710,11 +713,11 @@
set(TEST_PNG_VALID TRUE)
if(TEST_PNG_ALPHA)
- if (NOT "${alpha_type}" STREQUAL "alpha")
+ if(NOT "${alpha_type}" STREQUAL "alpha")
set(TEST_PNG_VALID FALSE)
endif()
else()
- if ("${alpha_type}" STREQUAL "alpha")
+ if("${alpha_type}" STREQUAL "alpha")
set(TEST_PNG_VALID FALSE)
endif()
endif()
@@ -783,51 +786,44 @@
# copies if different.
include(CMakeParseArguments)
-function(CREATE_SYMLINK DEST_FILE)
+function(create_symlink DEST_FILE)
cmake_parse_arguments(S "" "FILE;TARGET" "" ${ARGN})
if(NOT S_TARGET AND NOT S_FILE)
- message(FATAL_ERROR "Specify either a TARGET or a FILE for CREATE_SYMLINK to link to.")
- endif(NOT S_TARGET AND NOT S_FILE)
+ message(FATAL_ERROR "create_symlink: Missing TARGET or FILE argument")
+ endif()
if(S_TARGET AND S_FILE)
- message(FATAL_ERROR "CREATE_SYMLINK called with both source file ${S_FILE} and build target ${S_TARGET} arguments - can only handle 1 type per call.")
- endif(S_TARGET AND S_FILE)
+ message(FATAL_ERROR "create_symlink: Both source file ${S_FILE} and build target ${S_TARGET} arguments are present; can only have one.")
+ endif()
if(S_FILE)
# If we don't need to symlink something that's coming from a build target,
# we can go ahead and symlink/copy at configure time.
-
if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
execute_process(
- COMMAND "${CMAKE_COMMAND}" -E copy_if_different ${S_FILE} ${DEST_FILE}
- WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
- )
- else(CMAKE_HOST_WIN32 AND NOT CYGWIN)
+ COMMAND "${CMAKE_COMMAND}" -E copy_if_different ${S_FILE} ${DEST_FILE}
+ WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+ else()
execute_process(
- COMMAND ${CMAKE_COMMAND} -E create_symlink ${S_FILE} ${DEST_FILE}
- WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
- )
- endif(CMAKE_HOST_WIN32 AND NOT CYGWIN)
- endif(S_FILE)
+ COMMAND ${CMAKE_COMMAND} -E create_symlink ${S_FILE} ${DEST_FILE}
+ WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+ endif()
+ endif()
if(S_TARGET)
# We need to use generator expressions, which can be a bit tricky, so for
# simplicity make the symlink a POST_BUILD step and use the TARGET
# signature of add_custom_command.
-
if(CMAKE_HOST_WIN32 AND NOT CYGWIN)
add_custom_command(TARGET ${S_TARGET} POST_BUILD
- COMMAND "${CMAKE_COMMAND}" -E copy_if_different $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE}
- )
- else(CMAKE_HOST_WIN32 AND NOT CYGWIN)
+ COMMAND "${CMAKE_COMMAND}" -E copy_if_different $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE})
+ else()
add_custom_command(TARGET ${S_TARGET} POST_BUILD
- COMMAND "${CMAKE_COMMAND}" -E create_symlink $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE}
- )
- endif(CMAKE_HOST_WIN32 AND NOT CYGWIN)
-
- endif(S_TARGET)
+ COMMAND "${CMAKE_COMMAND}" -E create_symlink $<TARGET_LINKER_FILE_NAME:${S_TARGET}> $<TARGET_LINKER_FILE_DIR:${S_TARGET}>/${DEST_FILE})
+ endif()
+ endif()
endfunction()
@@ -839,16 +835,15 @@
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/scripts/gensrc.cmake.in
${CMAKE_CURRENT_BINARY_DIR}/scripts/gensrc.cmake @ONLY)
-
# libpng is a library so default to 'lib'
if(NOT DEFINED CMAKE_INSTALL_LIBDIR)
set(CMAKE_INSTALL_LIBDIR lib)
-endif(NOT DEFINED CMAKE_INSTALL_LIBDIR)
+endif()
# CREATE PKGCONFIG FILES
-# we use the same files like ./configure, so we have to set its vars
+# We use the same files like ./configure, so we have to set its vars.
# Only do this on Windows for Cygwin - the files don't make much sense outside
-# a UNIX look alike
+# of a UNIX look-alike.
if(NOT WIN32 OR CYGWIN OR MINGW)
set(prefix ${CMAKE_INSTALL_PREFIX})
set(exec_prefix ${CMAKE_INSTALL_PREFIX})
@@ -857,12 +852,12 @@
set(LIBS "-lz -lm")
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng.pc.in
${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}.pc @ONLY)
- CREATE_SYMLINK(libpng.pc FILE ${PNGLIB_NAME}.pc)
+ create_symlink(libpng.pc FILE ${PNGLIB_NAME}.pc)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libpng-config.in
${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config @ONLY)
- CREATE_SYMLINK(libpng-config FILE ${PNGLIB_NAME}-config)
-endif(NOT WIN32 OR CYGWIN OR MINGW)
+ create_symlink(libpng-config FILE ${PNGLIB_NAME}-config)
+endif()
# SET UP LINKS
if(PNG_SHARED)
@@ -883,7 +878,7 @@
endif()
# INSTALL
-if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL )
+if(NOT SKIP_INSTALL_LIBRARIES AND NOT SKIP_INSTALL_ALL)
install(TARGETS ${PNG_LIB_TARGETS}
${PNG_EXPORT_RULE}
RUNTIME DESTINATION bin
@@ -894,48 +889,47 @@
if(PNG_SHARED)
# Create a symlink for libpng.dll.a => libpng16.dll.a on Cygwin
if(CYGWIN OR MINGW)
- CREATE_SYMLINK(libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} TARGET png)
+ create_symlink(libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} TARGET png)
install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_IMPORT_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
- endif(CYGWIN OR MINGW)
+ endif()
if(NOT WIN32)
- CREATE_SYMLINK(libpng${CMAKE_SHARED_LIBRARY_SUFFIX} TARGET png)
+ create_symlink(libpng${CMAKE_SHARED_LIBRARY_SUFFIX} TARGET png)
install(FILES $<TARGET_LINKER_FILE_DIR:png>/libpng${CMAKE_SHARED_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
- endif(NOT WIN32)
- endif(PNG_SHARED)
+ endif()
+ endif()
if(PNG_STATIC)
if(NOT WIN32 OR CYGWIN OR MINGW)
- CREATE_SYMLINK( libpng${CMAKE_STATIC_LIBRARY_SUFFIX} TARGET png_static)
+ create_symlink(libpng${CMAKE_STATIC_LIBRARY_SUFFIX} TARGET png_static)
install(FILES $<TARGET_LINKER_FILE_DIR:png_static>/libpng${CMAKE_STATIC_LIBRARY_SUFFIX} DESTINATION ${CMAKE_INSTALL_LIBDIR})
- endif(NOT WIN32 OR CYGWIN OR MINGW)
- endif()
+ endif()
+ endif()
endif()
-if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL )
- install(FILES ${libpng_public_hdrs} DESTINATION include)
- install(FILES ${libpng_public_hdrs} DESTINATION include/${PNGLIB_NAME})
+if(NOT SKIP_INSTALL_HEADERS AND NOT SKIP_INSTALL_ALL)
+ install(FILES ${libpng_public_hdrs} DESTINATION include)
+ install(FILES ${libpng_public_hdrs} DESTINATION include/${PNGLIB_NAME})
endif()
-if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL )
+if(NOT SKIP_INSTALL_EXECUTABLES AND NOT SKIP_INSTALL_ALL)
if(NOT WIN32 OR CYGWIN OR MINGW)
install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/libpng-config DESTINATION bin)
- install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
- DESTINATION bin)
- endif(NOT WIN32 OR CYGWIN OR MINGW)
+ install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config DESTINATION bin)
+ endif()
endif()
-if(NOT SKIP_INSTALL_PROGRAMS AND NOT SKIP_INSTALL_ALL )
+if(NOT SKIP_INSTALL_PROGRAMS AND NOT SKIP_INSTALL_ALL)
install(TARGETS ${PNG_BIN_TARGETS}
RUNTIME DESTINATION bin)
endif()
-if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL )
+if(NOT SKIP_INSTALL_FILES AND NOT SKIP_INSTALL_ALL)
# Install man pages
if(NOT PNG_MAN_DIR)
set(PNG_MAN_DIR "share/man")
endif()
- install(FILES libpng.3 libpngpf.3 DESTINATION ${PNG_MAN_DIR}/man3)
- install(FILES png.5 DESTINATION ${PNG_MAN_DIR}/man5)
+ install(FILES libpng.3 libpngpf.3 DESTINATION ${PNG_MAN_DIR}/man3)
+ install(FILES png.5 DESTINATION ${PNG_MAN_DIR}/man5)
# Install pkg-config files
if(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libpng.pc
@@ -946,12 +940,12 @@
DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/${PNGLIB_NAME}-config
DESTINATION bin)
- endif(NOT CMAKE_HOST_WIN32 OR CYGWIN OR MINGW)
+ endif()
endif()
# On versions of CMake that support it, create an export file CMake
# users can include() to import our targets
-if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL )
+if(PNG_EXPORT_RULE AND NOT SKIP_INSTALL_EXPORT AND NOT SKIP_INSTALL_ALL)
install(EXPORT libpng DESTINATION lib/libpng FILE lib${PNG_LIB_NAME}.cmake)
endif()
