獲取gcc源碼包

# wget https://ftp.gnu.org/gnu/gcc/gcc-6.1.0/gcc-6.1.0.tar.bz2

# tar -jxvf gcc-6.1.0.tar.bz2

下載依賴項

執(zhí)行download_prerequisites將會自動下載這些軟件并解壓到當前目錄，生成gcc編譯的make文件。自動安裝gcc需要下載諸如gmp、mpfr、mpc等依賴文件：

# cd gcc-6.1.0

# ./contrib/download_prerequisites

如果你的Linux無法直接聯(lián)網(wǎng)，那么你只能打開文件download_prerequisites，獲取到這些文件的下載鏈接，然后通過其他上網(wǎng)設(shè)備下載這些軟件。最后把這些軟件直接解壓到gcc源程序目錄(/路徑/6.1.0)下即可。

編譯安裝

# mkdir gcc-build

# cd gcc-build

# ../configure -enable-checking=release -enable-languages=c,c++ -disable-multilib

# make

# make install

注意make的-j選項可以指定同時運行的作業(yè)數(shù)量，即CPU核數(shù)，如果有4核則可以加上-j4

出錯解決

1.make過程中可能會出現(xiàn)以下錯誤信息：

build/genattrtab ../.././gcc/config/i386/i386.md insn-conditions.md \

-Atmp-attrtab.c -Dtmp-dfatab.c -Ltmp-latencytab.c

make[3]: *** [s-attrtab] Killed

make[3]: Leaving directory `/usr/src/gcc-4.9.2/host-x86_64-unknown-linux-gnu/gcc'

make[2]: *** [all-stage1-gcc] Error 2

make[2]: Leaving directory `/usr/src/gcc-4.9.2'

make[1]: *** [stage1-bubble] Error 2

make[1]: Leaving directory `/usr/src/gcc-4.9.2'

make: *** [all] Error 2

2.動態(tài)庫libstdc++.so.6版本不匹配

可以正常編譯程序，但是運行時出現(xiàn)以下問題：

/usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15’ not found

添加LD_LIBRARY_PATH環(huán)境變量即可解決：

# vim ~/.bash_profile

export LD_LIBRARY_PATH=/usr/local/lib:/usr/lib:/usr/local/lib64:/usr/lib64

# source ~/.bash_profile

GCC新特征

GCC 6.1 發(fā)布了，該版本較之前GCC5 新怎了大量的功能特性，默認采用C++14為新的標準，替代了之前的C++98。OpenMP 4.5規(guī)范將在本版本中被支持。此外，GCC 6.1 增強了對 C++17 的試驗性支持；大大改進了診斷特性，包括位置，位置范圍，拼寫錯誤標識符建議，選項名字等等改進；新增了修復(fù)提示和一些警告提示。改進記錄如下：

UndefinedBehaviorSanitizer gained a new sanitization option, -fsanitize=bounds-strict, which enables strict checking of array bounds. In particular, it enables -fsanitize=bounds as well as instrumentation of flexible array member-like arrays.

Type-based alias analysis now disambiguates accesses to different pointers. This improves precision of the alias oracle by about 20-30% on higher-level C++ programs. Programs doing invalid type punning of pointer types may now need -fno-strict-aliasing to work correctly.

Alias analysis now correctly supports weakref and alias attributes. This makes it possible to access both a variable and its alias in one translation unit which is common with link-time optimization.

Value range propagation now assumes that the this pointer of C++ member functions is non-null. This eliminates common null pointer checks but also breaks some non-conforming code-bases (such as Qt-5, Chromium, KDevelop). As a temporary work-around-fno-delete-null-pointer-checks can be used. Wrong code can be identified by using-fsanitize=undefined.

完整發(fā)布說明，可以在這里查看。

參考文章

(CSDN的Markdown不好用)

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