Hi,
I'm currently testing CMake 3.14.2's iOS support with our build system
and ran into a problem with try_compile() not finding the binary. Here
is an example while trying to configure libjpeg-turbo 2.0.2 (I've
shortened the paths to make this easier to read):
--- SNIP ---
-- Check size of size_t
CMake Error at share/cmake-3.14/Modules/CheckTypeSize.cmake:120
(try_compile):
Cannot copy output executable
''
to destination specified by COPY_FILE:
'libjpegturbo_library-ext-build/CMakeFiles/CheckTypeSize/SIZE_T.bin'
Unable to find the executable at any of:
libjpegturbo_library-ext-build/CMakeFiles/CMakeTmp/cmTC_3f58e
libjpegturbo_library-ext-build/CMakeFiles/CMakeTmp/Debug/cmTC_3f58e
libjpegturbo_library-ext-build/CMakeFiles/CMakeTmp/Debug/cmTC_3f58e.app/cmTC_3f58e
libjpegturbo_library-ext-build/CMakeFiles/CMakeTmp/Development/cmTC_3f58e
Call Stack (most recent call first):
share/cmake-3.14/Modules/CheckTypeSize.cmake:247 (__check_type_size_impl)
CMakeLists.txt:362 (check_type_size)
--- SNIP ---
The problem is that the binary created by try_compile is located at
libjpegturbo_library-ext-build/CMakeFiles/CMakeTmp/cmTC_3f58e.app, where
cmake doesn't look. This happens with both the Unix Makefile and Ninja
generators (since I don't use the Xcode generator I have no idea if it
works there). The following patch to cmake fixes the problem:
--- SNIP ---
diff -uNr cmake-3.14.2.orig/Source/cmCoreTryCompile.cxx
cmake-3.14.2/Source/cmCoreTryCompile.cxx
--- cmake-3.14.2.orig/Source/cmCoreTryCompile.cxx 2019-04-12
14:10:08.000000000 +0200
+++ cmake-3.14.2/Source/cmCoreTryCompile.cxx 2019-04-15
14:54:32.466161185 +0200
@@ -1040,8 +1040,12 @@
}
searchDirs.emplace_back("/Debug");
#if defined(__APPLE__)
- std::string app = "/Debug/" + targetName + ".app";
+ // When building for Darwin, iOS, etc., the test program may be an .app
+ // bundle, so look for those as well.
+ std::string app = "/" + targetName + ".app";
searchDirs.push_back(std::move(app));
+ std::string appd = "/Debug/" + targetName + ".app";
+ searchDirs.push_back(std::move(appd));
#endif
searchDirs.emplace_back("/Development");
--- SNIP ---
So my question - is this a bug in CMake (the documentation says the
Xcode generator is recommended, so I presume the other generators do not
receive as much testing for iOS targets), or I am doing something
fundamentally wrong ?
With kind regards,
Eric
--
*Dr. Eric Dönges *
Senior Software Engineer
MVTec Software GmbH | Arnulfstr. 205 | 80634 Munich | Germany
doen...@mvtec.com <mailto:doen...@mvtec.com> | Tel: +49 89 457 695-0 |
www.mvtec.com <http://www.mvtec.com>
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