<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Wingdings;
panose-1:5 0 0 0 0 0 0 0 0 0;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
/* List Definitions */
@list l0
{mso-list-id:1152868207;
mso-list-type:hybrid;
mso-list-template-ids:1550879954 67698689 67698691 67698693 67698689 67698691 67698693 67698689 67698691 67698693;}
@list l0:level1
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:Symbol;}
@list l0:level2
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:"Courier New";}
@list l0:level3
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:Wingdings;}
@list l0:level4
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:Symbol;}
@list l0:level5
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:"Courier New";}
@list l0:level6
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:Wingdings;}
@list l0:level7
{mso-level-number-format:bullet;
mso-level-text:\F0B7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:Symbol;}
@list l0:level8
{mso-level-number-format:bullet;
mso-level-text:o;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:"Courier New";}
@list l0:level9
{mso-level-number-format:bullet;
mso-level-text:\F0A7;
mso-level-tab-stop:none;
mso-level-number-position:left;
text-indent:-.25in;
font-family:Wingdings;}
ol
{margin-bottom:0in;}
ul
{margin-bottom:0in;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>HI All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We are working towards creating a toolchain file for an ANDROID compiler<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We understand that the flow in CMAKE, when CMAKE_SYSTEM_NAME is specified in Android is different when compared to specifying CMAKE_SYSTEM_NAME as IOS or LINUX<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Please validate our current understanding when a toolchain file or command-line option sets CMAKE_SYSTEM_NAME to "Android" <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><ul style='margin-top:0in' type=disc><li class=MsoNormal style='mso-list:l0 level1 lfo1'>CMakeDetermineSystem.cmake loads this file: Android-Determine.cmake<o:p></o:p></li><li class=MsoNormal style='mso-list:l0 level1 lfo1'>Next is the platform-specific initialization step: CMakeSystemSpecificInitialize.cmake which loads Android-Initialize.cmake to select the sysroot.<o:p></o:p></li><li class=MsoNormal style='mso-list:l0 level1 lfo1'>A "determine" step also runs for each language when it is first enabled in a new build tree:<o:p></o:p></li></ul><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'>Android-Determine-C.cmake<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Android-Determine-CXX.cmake<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><ul style='margin-top:0in' type=disc><li class=MsoNormal style='mso-list:l0 level1 lfo1'>The language files go here:<o:p></o:p></li></ul><p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p><p class=MsoNormal style='margin-left:.5in'>Determine-Compiler.cmake<o:p></o:p></p><p class=MsoNormal style='margin-left:.5in'>Determine-Compiler-NDK.cmake<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><ul style='margin-top:0in' type=disc><li class=MsoNormal style='mso-list:l0 level1 lfo1'>The latter file is where we parse a bunch of information from the NDK.<o:p></o:p></li></ul><p class=MsoNormal style='margin-left:.5in;text-indent:.5in'>The results persist in CMakeFiles/$v/CMake${lang}Compiler.cmake for future runs.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-left:1.0in'>Next is the language-specific initialization step. For Example – in case {lang} is C : CMakeCInformation.cmake<o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p><p class=MsoNormal style='margin-left:1.0in'>That loads one of these:<o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p><p class=MsoNormal style='margin-left:1.0in'>Android-GNU-C.cmake<o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'>Android-Clang-C.cmake<o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p><p class=MsoNormal style='margin-left:1.0in'>which loads one of these:<o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p><p class=MsoNormal style='margin-left:1.0in'>Android-GNU.cmake<o:p></o:p></p><p class=MsoNormal style='margin-left:1.0in'>Android-Clang.cmake <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-indent:.5in'>Determine-Compiler-NDK.cmake is where cmake looks for versions of clang or gcc or llvm toolchains and sets the appropriate compiler.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><b><u>Our Requirement and Problem statement<o:p></o:p></u></b></p><p class=MsoNormal>When we tried manually setting a c and cxx compiler from a toolchain file, cmake would not allow us to point to our own compilers. Ideally, we want our toolchain file to tell cmake the libraries to include/link and the compilers to use. But once, System has been determined as android, cmake goes through the above sequence of events and expects toolchains to be specified for either clang, gcc or llvm compilers.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We would probably need to make changes in the following files to accommodate cmake to use our own compilers.<o:p></o:p></p><p class=MsoNormal>Determine-Compiler-NDK.cmake - We would need to add support for an "NewCompiler Toolchain" which would contain android libraries and compilers.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>New Android-{NewCompiler}-C.cmake, Android-{ NewCompiler }-CXX.cmake, Android-{ NewCompiler }.cmake and another appropriate toolchain file to set target architecture and compiler flags.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Can you please provide your suggestions and validate the understanding as well<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks & Regards,<o:p></o:p></p><p class=MsoNormal>Ramya<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>