Building for iOS: fatal error: 'fp.h' file not found

patrickkidd

I am seeing this trying to build qt-5.15.16 for iOS from source.

Host: macOS Sequoia 15.13.2
Xcode: Version 16.3 (16E140)
Configure line:

./configure -prefix /Users/patrick/dev/familydiagram/lib/Qt/5.15.16-ios -xplatform macx-ios-clang -opensource -confirm-license -nomake examples -nomake tests -skip qtactiveqt -skip qtcanvas3d -skip qtgamepad -skip qtremoteobjects -skip qtscript -skip qtspeech -skip qtvirtualkeyboard -skip qtwayland -skip qtwebview -skip qtwebengine -skip qtwebchannel -skip qtwebglplugin -skip qtwebsockets -skip qtserialbus -skip qtserialport

Error:

cd 3rdparty/libpng/ && ( test -e Makefile || /Users/patrick/dev/familydiagram/lib/qt-everywhere-src-ios-5.15.16/qtbase/bin/qmake -o Makefile /Users/patrick/dev/familydiagram/lib/qt-everywhere-src-ios-5.15.16/qtbase/src/3rdparty/libpng/libpng.pro ) && /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile 
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile.Debug all
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -c -pipe -g -fPIC -std=gnu11  -arch arm64  -arch x86_64 -Xarch_arm64 -miphoneos-version-min=12.0 -Xarch_arm64 -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS18.4.sdk -Xarch_x86_64 -mios-simulator-version-min=12.0 -Xarch_x86_64 -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator18.4.sdk -fobjc-nonfragile-abi -fobjc-legacy-dispatch -fvisibility=hidden -w -fno-exceptions -DQT_NO_LINKED_LIST -DQT_NO_JAVA_STYLE_ITERATORS -DQT_COMPILER_SUPPORTS_SSE2 -DQT_NO_NARROWING_CONVERSIONS_IN_CONNECT -DGLES_SILENCE_DEPRECATION -DPNG_ARM_NEON_OPT=0 -DPNG_POWERPC_VSX_OPT=0 -DPNG_IMPEXP= -D_CRT_SECURE_NO_DEPRECATE -DQT_NO_DYNAMIC_CAST -DQT_NO_EXCEPTIONS -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I. -I../../../mkspecs/common/uikit -I. -I../../../mkspecs/macx-ios-clang -o .obj/debug/png.o png.c
In file included from png.c:14:
./pngpriv.h:524:16: fatal error: 'fp.h' file not found
  524 | #      include <fp.h>
      |                ^~~~~~
1 error generated.
make[4]: *** [.obj/debug/png.o] Error 1
make[3]: *** [debug-all] Error 2
make[2]: *** [sub-3rdparty-libpng-make_first] Error 2
make[1]: *** [sub-src-make_first] Error 2
make: *** [module-qtbase-make_first] Error 2

lbryan

I am also encountering this issue when building from source for qt 5.15.2
Host: macOS Sequoia 15.4 (24E248)
Xcode: Version 16.3 (16E140)

I was able to patch the issue on my end by making the edit to pngpriv.h from this commit https://github.com/qt/qtbase/commit/528032c02771ddc35d054ff8d414b382904b607e#diff-55d511ae5f1abd6828d0c0dc1e20806b2014b8f792c41998bbf12f73b37411c3R559

patrickkidd

I got a response in my QT Guerra issue report saying that it is recommended practice to always compile your own static third-party libraries. That way keeping them up-to-date. So in this case that would mean cross compiling Lib PNG and then passing the correct options to your configure script so that it is linked in.

lbryan

Ah that makes sense. Thanks @patrickkidd