[Bug 268514] graphics/png: missing symbol after upgrading from 1.6.37 to 1.6.38

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 27 Dec 2022 17:57:37 UTC

--- Comment #3 from gnikl@justmail.de ---
(In reply to Tijl Coosemans from comment #1)
> Can you attach the following file:
> /usr/ports/graphics/png/work/.build/CMakeFiles/CMakeOutput.log
I attached CMakeError.log since this shows that the missing symbol versions are
caused by a libpng cmake configuration bug. CMakeLists.txt uses a compile/link
test to detect symbol versioning support, configure parses the linker help
output to detect version-script support. The CMakeLists.txt approach is broken
since the test creates a normal executable. The test "works" with lld but fails
for GNU ld as shown in the attached CMakeOutput.log.

/usr/local/bin/ld --version: GNU ld (GNU Binutils) 2.39

Using ${CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS} fixes the detection test for GNU

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