手機 - Motorola XT897 - Sailfish OS 3.3.0.16 - Build GCC 4.9.4

參考資訊：
https://gist.github.com/unity-car-tutorials/0ce692a5ecb06c656182
https://reviews.llvm.org/rG383fe5c8668f63ef21c646b43f48da9fa41aa100
https://patchwork.ozlabs.org/project/gcc/patch/6824253.3U2boEivI2@devpool21/

步驟如下：
1. 手動掛載SWAP 2GB
2. 編譯安裝coreutils(/usr/bin/install記得symlink到/usr/local/bin/install)
3. 執行如下命令

$ export GCC_VERSION="4.9.4"
$ export WORKDIR="/home/nemo/Downloads/gcc-${GCC_VERSION}"
$ export INSTALLDIR="/opt/gcc-${GCC_VERSION}"

$ rm -rf ${WORKDIR}
$ mkdir -p ${WORKDIR}

$ cd $WORKDIR
$ wget http://www.netgull.com/gcc/releases/gcc-${GCC_VERSION}/gcc-${GCC_VERSION}.tar.bz2
$ tar -xf gcc-${GCC_VERSION}.tar.bz2

$ cd gcc-${GCC_VERSION}
$ ./contrib/download_prerequisites
 
$ cd ..
$ mkdir gcc-build
$ cd gcc-build

$ ../gcc-${GCC_VERSION}/configure --prefix=${INSTALLDIR} --with-gnu-as --with-gnu-ld --disable-libmudflap --enable-lto --enable-objc-gc --enable-shared --without-included-gettext --enable-nls --disable-sjlj-exceptions --enable-gnu-unique-object --enable-linker-build-id --disable-libstdcxx-pch --enable-c99 --enable-clocale=gnu --enable-libstdcxx-debug --enable-long-long --with-cloog=no --with-ppl=no --with-isl=no --disable-multilib --with-float=hard --with-mode=thumb --with-tune=cortex-a9 --with-arch=armv7-a --with-fpu=vfpv3-d16 --enable-threads=posix --enable-multiarch --enable-libstdcxx-time=yes --enable-checking=release --disable-bootstrap --enable-languages=c,c++,fortran,lto

$ make
    ../../../../gcc-4.9.4/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:84:23: fatal error: sys/ustat.h: No such file or directory
    #include <sys/ustat.h>

$ vim ../gcc-4.9.4/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
    84  //#include <sys/ustat.h>
    153 #if SANITIZER_LINUX
    154   unsigned struct_rlimit_sz = sizeof(struct rlimit);
    155   unsigned struct_epoll_event_sz = sizeof(struct epoll_event);
    156   unsigned struct_sysinfo_sz = sizeof(struct sysinfo);
    157   unsigned struct_timespec_sz = sizeof(struct timespec);
    158   unsigned __user_cap_header_struct_sz =
    159       sizeof(struct __user_cap_header_struct);
    160   unsigned __user_cap_data_struct_sz = sizeof(struct __user_cap_data_struct);
    161   unsigned struct_utimbuf_sz = sizeof(struct utimbuf);
    162   unsigned struct_new_utsname_sz = sizeof(struct new_utsname);
    163   unsigned struct_old_utsname_sz = sizeof(struct old_utsname);
    164   unsigned struct_oldold_utsname_sz = sizeof(struct oldold_utsname);
    165   unsigned struct_itimerspec_sz = sizeof(struct itimerspec);
    166   
    167 #if defined(__aarch64__) || defined(__s390x__) || defined (__mips64) || defined(__powerpc64__) || defined(__arch64__) || defined(__sparcv9) || defined(__x86_64__)
    168 #define SIZEOF_STRUCT_USTAT 32
    169 #elif defined(__arm__) || defined(__i386__) || defined(__mips__) || defined(__powerpc__) || defined(__s390__)
    170 #define SIZEOF_STRUCT_USTAT 20
    171 #else
    172 #error Unknown size of struct ustat
    173 #endif
    174 
    175   unsigned struct_ustat_sz = SIZEOF_STRUCT_USTAT;
    176 #endif // SANITIZER_LINUX

$ make
    ../../../../gcc-4.9.4/libsanitizer/asan/asan_linux.cc:107:20: error: 'SIGSEGV' was not declared in this scope
        return signum == SIGSEGV && flags()->handle_segv;
                    ^
    ../../../../gcc-4.9.4/libsanitizer/asan/asan_linux.cc:108:1: warning: control reaches end of non-void function [-Wreturn-type]
        }

$ vim ../gcc-4.9.4/libsanitizer/asan/asan_linux.cc 
    29  #include <signal.h>

$ make
$ sudo make install