<div dir="ltr"><div>Hi,</div><div><br></div><div>Sorry a small correction.</div><div><br></div><div>There is no such thing as "NO_CMAKE_SYSROOT".<br></div><div><br></div><div><span class="gmail-im"><div>find_file(AWSSDK_CORE_HEADER_FILE Aws.h<br> "${AWSSDK_ROOT_DIR}/${AWSSDK_INSTALL_INCLUDEDIR}/aws/core"<br> "${AWSSDK_DEFAULT_ROOT_DIR}/${AWSSDK_INSTALL_INCLUDEDIR}/aws/core"</div></span><div> NO_CMAKE_FIND_ROOT_PATH</div><div><b> NO_CMAKE_SYSTEM_PATH</b><br></div><div> )</div><div><br></div><div>Regards,</div><div>Ugesh<br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jul 31, 2019 at 9:49 AM ugesh reddy <<a href="mailto:abhiugeshreddy@gmail.com">abhiugeshreddy@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi,</div><div><br></div><div>I also have the same issue with find_file/find_path/find_package when I use the Android NDK and Eric's explanation make sense.<br></div><div><br></div><div>One way to solve this</div><div><br></div><div>find_file(AWSSDK_CORE_HEADER_FILE Aws.h<br> "${AWSSDK_ROOT_DIR}/${AWSSDK_INSTALL_INCLUDEDIR}/aws/core"<br> "${AWSSDK_DEFAULT_ROOT_DIR}/${AWSSDK_INSTALL_INCLUDEDIR}/aws/core"</div><div><b> NO_CMAKE_FIND_ROOT_PATH</b></div><div><b> NO_CMAKE_SYSROOT</b><br></div><div> )</div><div><br></div><div></div><div>Regards,</div><div>Ugesh Gurram.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jul 31, 2019 at 9:16 AM Eric Doenges <<a href="mailto:doenges@mvtec.com" target="_blank">doenges@mvtec.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
Am 31.07.19 um 08:20 schrieb Stephan Menzel:<br>
<blockquote type="cite">
<div dir="ltr">Hello all,
<div><br>
</div>
<div>I'm trying to adapt my CMake based toolchain to Android and
I'm noticing very strange behavior that I'd like to ask about.</div>
<div>My toolchain is C++ based with some dependencies such as
Boost, OpenSSL or protobuf. So far it works on a variety of
platforms such as Windows (MSVC), several Linuxes, including
Raspbian on ARM. So I considered myself well prepared for
Android, thinking it can't be that different. How wrong I
was... I'm cross compiling from a Linux system, which is able
to build the source in question just fine with clang and gcc.
Most recent Android SDK and bundled NDK.</div>
<div><br>
</div>
<div>As soon as I started building and finding my 3rd party
dependencies I noticed that many commands in my own scripts or
others that try to find a file (like a header) or a lib fail
despite the file being there.</div>
<div>Like here in this case for example (randomly taken from the
AWS SDK installed CMake finders):</div>
</div>
</blockquote>
<p>My experience has been that find_file and friends behave in
unexpected ways when you set CMAKE_SYSROOT. In our toolchain
files, we set</p>
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)<br>
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)<br>
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)<br>
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)<br>
<p>as suggested in the cmake-toolchains(7) documentation. We then
add the path to the top-level directory where we keep all our
thirdparty dependencies to CMAKE_FIND_ROOT_PATH, as otherwise
find_package and find_path cannot find anything even when we give
them the absolute path where to search (the find_file
documentation suggests that the elements of the
CMAKE_FIND_ROOT_PATH are prepended to the paths specified in the
find_file arguments, but that does not seem to happen if the
search paths are subpaths of the CMAKE_FIND_ROOT_PATH). My guess
would be that the NDK does something similar, meaning you would
need to add the path where to look for AWS to
CMAKE_FIND_ROOT_PATH.<br>
</p>
<p>CMake feature request: it would be real nice to have a verbose
mode for the find_XXX functions that tell you exactly where CMake
is looking for stuff and why to help debug problems like this.</p>
<p>With kind regards,<br>
Eric<br>
</p>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail-m_-4730681873049219729gmail_signature"> Ugesh</div>
</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"> Ugesh</div>