Building FlightGear - Cross Compiling: Difference between revisions

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Building FlightGear - Cross Compiling (view source)

Revision as of 18:14, 31 May 2015

3,062 bytes added ,  31 May 2015
m
→‎Contributing: ccache & cmake
m (add placeholder image as "logo" for now (screen shot showing mxe/shared build))
m (→‎Contributing: ccache & cmake)
Line 439: Line 439:
* Building mxe: http://mxe.cc/#usage
* Building mxe: http://mxe.cc/#usage
* Creating packages: http://mxe.cc/#creating-packages
* Creating packages: http://mxe.cc/#creating-packages
Before building mxe, you should consider installing ccache first, which also requires adapting the pkgconf.mk file in mxe:
<syntaxhighlight lang="bash">
sudo apt-get install ccache
</syntaxhighlight>
Next, open src/pkgconf.mk and add the ccache executable in front of the compiler executable (this will only affect mxe-conf.cmake, so it will only benefit cmake-based projects in its current form).
<syntaxhighlight lang="diff">
diff --git a/src/pkgconf.mk b/src/pkgconf.mk
index 9a23619..c1e30e4 100644
--- a/src/pkgconf.mk
+++ b/src/pkgconf.mk
@@ -52,9 +52,9 @@ define $(PKG)_BUILD_COMMON
      echo 'set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)'; \
      echo 'set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)'; \
      echo 'set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)'; \
-    echo 'set(CMAKE_C_COMPILER $(PREFIX)/bin/$(TARGET)-gcc)'; \
-    echo 'set(CMAKE_CXX_COMPILER $(PREFIX)/bin/$(TARGET)-g++)'; \
-    echo 'set(CMAKE_Fortran_COMPILER $(PREFIX)/bin/$(TARGET)-gfortran)'; \
+    echo 'set(CMAKE_C_COMPILER ccache $(PREFIX)/bin/$(TARGET)-gcc)'; \
+    echo 'set(CMAKE_CXX_COMPILER ccache $(PREFIX)/bin/$(TARGET)-g++)'; \
+    echo 'set(CMAKE_Fortran_COMPILER ccache $(PREFIX)/bin/$(TARGET)-gfortran)'; \
      echo 'set(CMAKE_RC_COMPILER $(PREFIX)/bin/$(TARGET)-windres)'; \
      echo 'set(CMAKE_MODULE_PATH "$(PWD)/src/cmake" $${CMAKE_MODULE_PATH}) # For mxe FindPackage scripts'; \
      echo 'set(CMAKE_INSTALL_PREFIX $(PREFIX)/$(TARGET) CACHE PATH "Installation Prefix")'; \
</syntaxhighlight>
To see if you were successful adding ccache, check the generated toolchain file:
<syntaxhighlight lang="bash">
cat usr/x86_64-w64-mingw32.shared/share/cmake/mxe-conf.cmake
</syntaxhighlight>
it should look like this:
<syntaxhighlight lang="cmake">
set(CMAKE_SYSTEM_NAME Windows)
set(MSYS 1)
set(BUILD_SHARED_LIBS ON)
set(LIBTYPE SHARED)
set(CMAKE_BUILD_TYPE Release)
set(CMAKE_FIND_ROOT_PATH /home/hooray/mxe/usr/x86_64-w64-mingw32.shared)
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_C_COMPILER ccache /home/hooray/mxe/usr/bin/x86_64-w64-mingw32.shared-gcc)
set(CMAKE_CXX_COMPILER ccache /home/hooray/mxe/usr/bin/x86_64-w64-mingw32.shared-g++)
set(CMAKE_Fortran_COMPILER ccache /home/hooray/mxe/usr/bin/x86_64-w64-mingw32.shared-gfortran)
set(CMAKE_RC_COMPILER /home/hooray/mxe/usr/bin/x86_64-w64-mingw32.shared-windres)
set(CMAKE_MODULE_PATH "/home/hooray/mxe/src/cmake" ${CMAKE_MODULE_PATH}) # For mxe FindPackage scripts
set(CMAKE_INSTALL_PREFIX /home/hooray/mxe/usr/x86_64-w64-mingw32.shared CACHE PATH "Installation Prefix")
set(CMAKE_BUILD_TYPE Release CACHE STRING "Debug|Release|RelWithDebInfo|MinSizeRel")
set(CMAKE_CROSS_COMPILING ON) # Workaround for http://www.cmake.org/Bug/view.php?id=14075
set(CMAKE_RC_COMPILE_OBJECT "<CMAKE_RC_COMPILER> -O coff <FLAGS> <DEFINES> -o <OBJECT> <SOURCE>") # Workaround for buggy windres rules
set(PKG_CONFIG_EXECUTABLE /home/hooray/mxe/usr/bin/x86_64-w64-mingw32.shared-pkg-config)
</syntaxhighlight>




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