Недавно на форуме задавал вопрос по сборке и линковке libpng CMake`ом, получил решение и оно отлично работает - но только для сборки либы в статичном виде. Попытка собрать её же в SHARED виде оканчивается ошибками линковки. Вопрос, что я делаю не так? Текущий CMakeLists.txt:
cmake_minimum_required(VERSION 3.16 FATAL_ERROR)
set(PROJECT_NAME test)
project(${PROJECT_NAME} VERSION 1.0.0 LANGUAGES CXX)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/zlib ${CMAKE_CURRENT_BINARY_DIR}/zlib)
include_directories(${CMAKE_CURRENT_SOURCE_DIR}/libpng ${CMAKE_CURRENT_BINARY_DIR}/libpng)
set(PNG_BUILD_ZLIB ON CACHE BOOL "" FORCE)
set(PNG_SHARED ON CACHE BOOL "" FORCE)
set(PNG_TESTS OFF CACHE BOOL "" FORCE)
set(ZLIB_INCLUDE_DIR ${zlib_SOURCE_DIR} ${zlib_BINARY_DIR})
add_subdirectory(zlib)
add_subdirectory(libpng)
Если установить PNG_SHARED как OFF, прекрасно собирается png_static, иначе выдаёт ошибки:
png.obj : error LNK2019: unresolved external symbol inflateReset referenced in function png_reset_zstream [D:\Projects\
temp\build\libpng\png.vcxproj]
pngrutil.obj : error LNK2001: unresolved external symbol inflateReset [D:\Projects\temp\build\libpng\png.vcxproj]
png.obj : error LNK2019: unresolved external symbol adler32 referenced in function png_compare_ICC_profile_with_sRGB [D
:\Projects\temp\build\libpng\png.vcxproj]
png.obj : error LNK2019: unresolved external symbol crc32 referenced in function png_calculate_crc [D:\Projects\temp\bu
ild\libpng\png.vcxproj]
pngread.obj : error LNK2019: unresolved external symbol inflateEnd referenced in function png_destroy_read_struct [D:\P
rojects\temp\build\libpng\png.vcxproj]
pngrutil.obj : error LNK2019: unresolved external symbol inflate referenced in function png_inflate [D:\Projects\temp\b
uild\libpng\png.vcxproj]
pngrutil.obj : error LNK2019: unresolved external symbol inflateReset2 referenced in function png_inflate_claim [D:\Pro
jects\temp\build\libpng\png.vcxproj]
pngrutil.obj : error LNK2019: unresolved external symbol inflateInit2_ referenced in function png_inflate_claim [D:\Pro
jects\temp\build\libpng\png.vcxproj]
pngrutil.obj : error LNK2019: unresolved external symbol inflateValidate referenced in function png_inflate_claim [D:\P
rojects\temp\build\libpng\png.vcxproj]
pngwrite.obj : error LNK2019: unresolved external symbol deflateEnd referenced in function png_destroy_write_struct [D:
\Projects\temp\build\libpng\png.vcxproj]
pngwutil.obj : error LNK2001: unresolved external symbol deflateEnd [D:\Projects\temp\build\libpng\png.vcxproj]
pngwutil.obj : error LNK2019: unresolved external symbol deflate referenced in function png_compress_IDAT [D:\Projects\
temp\build\libpng\png.vcxproj]
pngwutil.obj : error LNK2019: unresolved external symbol deflateReset referenced in function png_deflate_claim [D:\Proj
ects\temp\build\libpng\png.vcxproj]
pngwutil.obj : error LNK2019: unresolved external symbol deflateInit2_ referenced in function png_deflate_claim [D:\Pro
jects\temp\build\libpng\png.vcxproj]
D:\Projects\temp\build\libpng\Release\libpng16.dll : fatal error LNK1120: 12 unresolved externals [D:\Projects\temp\bui
ld\libpng\png.vcxproj]
Building Custom Rule D:/Projects/temp/libpng/CMakeLists.txt
png-fix-itxt.c
png-fix-itxt.obj : error LNK2019: unresolved external symbol crc32 referenced in function main [D:\Projects\temp\build\
libpng\png-fix-itxt.vcxproj]
D:\Projects\temp\build\libpng\Release\png-fix-itxt.exe : fatal error LNK1120: 1 unresolved externals [D:\Projects\temp\
build\libpng\png-fix-itxt.vcxproj]
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