Use ccache if available.

If ccache is availble, use it. It can improve a lot the compilation time.
We do not change the meson_cross_file.txt as, for now, meson doesn't
support ccache when cross-compiling.

kiwix-build.py

@@ -358,7 +358,14 @@ class BuildEnv:
                                   if env['PKG_CONFIG_PATH']
                                   else pkgconfig_path
                                  )
-        env['PATH'] = ':'.join([pj(self.install_dir, 'bin'), env['PATH']])
+        # Add ccache path
+        for p in ('/usr/lib/ccache', '/usr/lib64/ccache'):
+            if os.path.isdir(p):
+                ccache_path=[p]
+                break
+        else:
+            ccache_path = []
+        env['PATH'] = ':'.join([pj(self.install_dir, 'bin')] + ccache_path + [env['PATH']])
         ld_library_path = ':'.join([
             pj(self.install_dir, 'lib'),
             pj(self.install_dir, 'lib64')

templates/bash_wrapper.sh

@@ -10,9 +10,18 @@ PATH="{root_path}/bin:$PATH_ORIG"; export PATH;
 HOST_CC=gcc; export HOST_CC;
 unset PKG_CONFIG_PATH;
 
-CC={which:{binaries[c]}}; export CC
+ccache=`which ccache`
+
+CC={which:{binaries[c]}}
+CXX={which:{binaries[cpp]}}
+if [ "x$ccache" != "x" ] ; then
+    CC="ccache $CC"
+    CXX="ccache $CXX"
+fi
+export CC
+export CXX
+
 AR={which:{binaries[ar]}}; export AR
-CXX={which:{binaries[cpp]}}; export CXX
 STRIP={which:{binaries[strip]}}; export STRIP
 CFLAGS=" -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions --param=ssp-buffer-size=4"; export CFLAGS;
 CXXFLAGS=" -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions --param=ssp-buffer-size=4"; export CXXFLAGS;

templates/cmake_cross_file.txt

@@ -2,12 +2,18 @@ SET(CMAKE_SYSTEM_NAME Windows)
 SET(CMAKE_SYSTEM_PROCESSOR x86)
 
 # specify the cross compiler
-SET(CMAKE_C_COMPILER {which:{binaries[c]}})
+SET(CMAKE_C_COMPILER "{which:{binaries[c]}}")
-SET(CMAKE_CXX_COMPILER {which:{binaries[cpp]}})
+SET(CMAKE_CXX_COMPILER "{which:{binaries[cpp]}}")
 SET(CMAKE_RC_COMPILER {which:{binaries[windres]}})
 SET(CMAKE_AR:FILEPATH {which:{binaries[ar]}})
 SET(CMAKE_RANLIB:FILEPATH {which:{binaries[ranlib]}})
 
+find_program(CCACHE_FOUND ccache)
+if(CCACHE_FOUND)
+        set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
+        set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
+endif(CCACHE_FOUND)
+
 # where is the target environment
 SET(CMAKE_FIND_ROOT_PATH {root_path})