Build issue when trying to build with ios.toolchain.cmake

[kirankumar-ravuri]

Hi All,

I am trying to use ios cmake toolchain to build libre using following command.

cmake -B build --fresh -DCMAKE_TOOLCHAIN_FILE=ios.toolchain.cmake -DPLATFORM=MAC_ARM64 && cmake --build build --target re -j

I am using this tool chain so that it can be used for other apple platforms. I found one issue when build with this tool chain.

fatal error: 'threads.h' file not found
#include <threads.h>

UPDATE:
This command is to build libre on Mac M1 for Mac M1

Would someone like to help me in figuring this out?

BRs
Kiran

[kirankumar-ravuri]

I debugged this further.

When I executed

$ cmake -B build -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++
$ cmake --build build -j

got below log for thrd_create, accept4

-- Looking for thrd_create
-- Looking for thrd_create - not found
-- Looking for accept4
-- Looking for accept4 - not found

But with

$cmake -B build --fresh -DCMAKE_TOOLCHAIN_FILE=ios.toolchain.cmake -DPLATFORM=MAC_ARM64 && cmake --build build --target re -j

there is different log

-- Looking for thrd_create
-- Looking for thrd_create - found
-- Looking for accept4
-- Looking for accept4 - found

In theory, both commands be using same toolchain and library paths.

On debugging further, there seems to be false positives for check_function_exists(thrd_create HAVE_THREADS) and check_function_exists(accept4 HAVE_ACCEPT4) with the toolchain.
I tried debugging it with logs, couldn't understand what exactly happening.

I went ahead and commented below, as this were not detected without using ios.toolchain.cmake

check_function_exists(thrde_create HAVE_THREADS)
if(HAVE_THREADS)
   list(APPEND RE_DEFINITIONS -DHAVE_THREADS)
endif()

 check_function_exists(accept4 HAVE_ACCEPT4)
 if(HAVE_ACCEPT4)
   list(APPEND RE_DEFINITIONS -DHAVE_ACCEPT4)
 endif()

Then build was success.

[kirankumar-ravuri]

I tried to do build libre in iOS using the same toolchain. I had to do some modifications because the toolchain overwrites
CMAKE_SYSTEM_NAME.

After replacing
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
with
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR ${CMAKE_SYSTEM_NAME} MATCHES "iOS")
it moved ahead.

But there is a compilation error as the below header file is not found in iOS SDK.

#include <net/route.h>

Similar thing is discussed and solved in below links. Solution is simply to copy and paste route.h from MacSDK locally and build.

fluttercommunity/plus_plugins#431
https://github.com/ygweric/IOS-RouteAddress/blob/master/RouterAddressDemo/getgateway.c

I haven't tried these yet.

But I would like to know from experts whether that is correct approach.

[kirankumar-ravuri]

Hi All

Would some like to give any inputs here?

BRs
Kiran