PNG support will not be enabled

[Mr-Z-2697]

${COMPILE_FLAGS} and ${CJPEG_BMP_SOURCES} are not used anywhere else.

mozjpeg/CMakeLists.txt

Lines 793 to 797 in 9b8d11f

	if(PNG_SUPPORTED)
	report_option(PNG_SUPPORTED "PNG reading support")
	set(COMPILE_FLAGS "${COMPILE_FLAGS} -DPNG_SUPPORTED")
	set(CJPEG_BMP_SOURCES ${CJPEG_BMP_SOURCES} rdpng.c)
	endif()

[Sofahamster]

I can't get PNG suppport working either.

cmake output shows:

-- PNG reading support enabled (PNG_SUPPORTED = 1)
-- Found ZLIB: /usr/lib/x86_64-linux-gnu/libz.so (found version "1.2.13")
-- Found PNG: /usr/lib/x86_64-linux-gnu/libpng.so (found suitable version "1.6.39", minimum required is "1.6")
-- PNG reading support enabled (PNG_SUPPORTED = 1)                                                                          

yet when trying to invoke cjpeg with a png file:

MozJPEG can't read the image (PNG support is disabled in this build)

Checking in build/sharedlib/CMakeFiles/cjpeg.dir/flags.make, I can see that PNG_SUPPORTED is missing from the C_FLAGS:

C_FLAGS = -O3 -DNDEBUG -DBMP_SUPPORTED -DGIF_SUPPORTED -DPPM_SUPPORTED -DTARGA_SUPPORTED

Using:

• Debian 12 aka Bookworm
• CMake 3.25.1

[templarundead]

The same issue on Debian Bookworm/Trixie Aarch64.