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build: Fix the CMake file for cross-platform builds that require libm

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Detect the availability of `libm` on the target platform.
Previously, `libm` was detected on the host platform only.

Also introduce the variable `PNG_LINK_LIBRARIES`.
Stop using `M_LIBRARY`, which was not namespace-clean.
This commit is contained in:
Cosmin Truta 2025-06-30 22:27:17 +03:00
parent 2e5f296bfa
commit 8087a21d0a
1 changed files with 13 additions and 16 deletions
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29
CMakeLists.txt
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@ -30,6 +30,7 @@ project(libpng
LANGUAGES C ASM)
include(CheckCSourceCompiles)
include(CheckLibraryExists)
include(GNUInstallDirs)
# Allow the users to specify an application-specific API prefix for libpng
@ -138,19 +139,15 @@ endif()
# Find the zlib library.
find_package(ZLIB REQUIRED)
set(PNG_LINK_LIBRARIES ZLIB::ZLIB)
# Find the math library (where available).
if(UNIX
AND NOT (APPLE OR BEOS OR HAIKU)
AND NOT EMSCRIPTEN)
find_library(M_LIBRARY m)
if(M_LIBRARY)
set(M_LIBRARY m)
else()
set(M_LIBRARY "")
endif()
else()
# libm is not available or not needed.
# Find the math library (unless we already know it's not available or
# not needed).
if(UNIX AND NOT (APPLE OR BEOS OR HAIKU OR EMSCRIPTEN))
check_library_exists(m pow "" PNG_HAVE_LIBM_POW)
endif()
if(PNG_HAVE_LIBM_POW)
list(APPEND PNG_LINK_LIBRARIES m)
endif()
# Silence function deprecation warnings on the Windows compilers that might
@ -702,7 +699,7 @@ if(PNG_SHARED)
SYSTEM
INTERFACE "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>")
target_link_libraries(png_shared
PUBLIC ZLIB::ZLIB ${M_LIBRARY})
PUBLIC ${PNG_LINK_LIBRARIES})
endif()
if(PNG_STATIC)
@ -720,7 +717,7 @@ if(PNG_STATIC)
SYSTEM
INTERFACE "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>")
target_link_libraries(png_static
PUBLIC ZLIB::ZLIB ${M_LIBRARY})
PUBLIC ${PNG_LINK_LIBRARIES})
endif()
if(PNG_FRAMEWORK AND NOT APPLE)
@ -753,7 +750,7 @@ if(PNG_FRAMEWORK)
SYSTEM
INTERFACE "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}/libpng${PNGLIB_ABI_VERSION}>")
target_link_libraries(png_framework
PUBLIC ZLIB::ZLIB ${M_LIBRARY})
PUBLIC ${PNG_LINK_LIBRARIES})
endif()
if(NOT PNG_LIBRARY_TARGETS)
@ -950,7 +947,7 @@ if(PNG_SHARED AND PNG_TOOLS)
add_executable(png-fix-itxt ${png_fix_itxt_sources})
target_link_libraries(png-fix-itxt
PRIVATE ZLIB::ZLIB ${M_LIBRARY})
PRIVATE ${PNG_LINK_LIBRARIES})
list(APPEND PNG_BIN_TARGETS png-fix-itxt)
endif()