#Ruby on Rails

在CentOS 6 机器中安装sassc Gem,报如下的错误:

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[root@localhost ~ ]# gem install sassc
Building native extensions. This could take a while...
ERROR: Error installing sassc:
ERROR: Failed to build gem native extension.

current directory: /usr/local/rvm/gems/ruby-2.6.2/gems/sassc-2.0.1/ext
/usr/local/rvm/rubies/ruby-2.6.2/bin/ruby -rrubygems /usr/local/rvm/rubies/ruby-2.6.2/lib/ruby/gems/2.6.0/gems/rake-12.3.2/exe/rake RUBYARCHDIR\=/usr/local/rvm/gems/ruby-2.6.2/extensions/x86_64-linux/2.6.0/sassc-2.0.1 RUBYLIBDIR\=/usr/local/rvm/gems/ruby-2.6.2/extensions/x86_64-linux/2.6.0/sassc-2.0.1
cd libsass
make lib/libsass.so
mkdir lib
cc -Wall -O2 -I /usr/local/rvm/gems/ruby-2.6.2/gems/sassc-2.0.1/ext/libsass/include -fPIC -fPIC -c -o src/cencode.o src/cencode.c
src/cencode.c: In function ‘base64_encode_block’:
src/cencode.c:50: warning: empty declaration
src/cencode.c:64: warning: empty declaration
g++ -Wall -O2 -std=c++0x -I /usr/local/rvm/gems/ruby-2.6.2/gems/sassc-2.0.1/ext/libsass/include -fPIC -fPIC -c -o src/ast.o src/ast.cpp
In file included from src/ast.cpp:2:
src/ast.hpp: In member function ‘virtual size_t Sass::Vectorized<T>::hash()’:
src/ast.hpp:336: error: expected initializer before ‘:’ token
src/ast.hpp:339: error: expected primary-expression before ‘}’ token
src/ast.hpp:339: error: expected ‘;’ before ‘}’ token
src/ast.hpp:339: error: expected primary-expression before ‘}’ token
src/ast.hpp:339: error: expected ‘)’ before ‘}’ token
src/ast.hpp:339: error: expected primary-expression before ‘}’ token
src/ast.hpp:339: error: expected ‘;’ before ‘}’ token
src/ast.hpp: In constructor ‘Sass::Hashed::Hashed(size_t)’:
src/ast.hpp:373: error: ‘class Sass::ExpressionMap’ has no member named ‘reserve’
src/ast.hpp: In member function ‘Sass::Hashed& Sass::Hashed::operator+=(Sass::Hashed*)’:
src/ast.hpp:402: error: expected initializer before ‘:’ token
src/ast.hpp:406: error: could not convert ‘Sass::Hashed::reset_duplicate_key()’ to ‘bool’
src/ast.hpp:407: error: expected primary-expression before ‘return’
src/ast.hpp:407: error: expected ‘)’ before ‘return’
In file included from src/ast.cpp:2:
src/ast.hpp: In member function ‘virtual size_t Sass::Map::hash()’:
src/ast.hpp:1153: error: expected initializer before ‘:’ token
src/ast.hpp:1157: error: expected primary-expression before ‘}’ token
src/ast.hpp:1157: error: expected ‘;’ before ‘}’ token
src/ast.hpp:1157: error: expected primary-expression before ‘}’ token
src/ast.hpp:1157: error: expected ‘)’ before ‘}’ token
src/ast.hpp:1157: error: expected primary-expression before ‘}’ token
src/ast.hpp:1157: error: expected ‘;’ before ‘}’ token
src/ast.hpp: In member function ‘virtual size_t Sass::Function_Call::hash()’:
src/ast.hpp:1522: error: expected initializer before ‘:’ token
src/ast.hpp:1524: error: expected primary-expression before ‘}’ token
src/ast.hpp:1524: error: expected ‘;’ before ‘}’ token
src/ast.hpp:1524: error: expected primary-expression before ‘}’ token
src/ast.hpp:1524: error: expected ‘)’ before ‘}’ token
src/ast.hpp:1524: error: expected primary-expression before ‘}’ token
src/ast.hpp:1524: error: expected ‘;’ before ‘}’ token
src/ast.hpp: In member function ‘virtual size_t Sass::Number::hash()’:
src/ast.hpp:1614: error: expected initializer before ‘:’ token
src/ast.hpp:1616: error: expected primary-expression before ‘for’
src/ast.hpp:1616: error: expected ‘;’ before ‘for’
src/ast.hpp:1616: error: expected primary-expression before ‘for’
src/ast.hpp:1616: error: expected ‘)’ before ‘for’
src/ast.hpp:1616: error: expected initializer before ‘:’ token
src/ast.hpp:1618: error: expected primary-expression before ‘}’ token
src/ast.hpp:1618: error: expected ‘;’ before ‘}’ token
src/ast.hpp:1618: error: expected primary-expression before ‘}’ token
src/ast.hpp:1618: error: expected ‘)’ before ‘}’ token
src/ast.hpp:1618: error: expected primary-expression before ‘}’ token
src/ast.hpp:1618: error: expected ‘;’ before ‘}’ token
src/ast.hpp: In member function ‘bool Sass::String_Schema::has_interpolants()’:
src/ast.hpp:1791: error: expected initializer before ‘:’ token
src/ast.hpp:1794: error: expected primary-expression before ‘return’
src/ast.hpp:1794: error: expected ‘;’ before ‘return’
src/ast.hpp:1794: error: expected primary-expression before ‘return’
src/ast.hpp:1794: error: expected ‘)’ before ‘return’
src/ast.hpp: In member function ‘virtual size_t Sass::String_Schema::hash()’:
src/ast.hpp:1801: error: expected initializer before ‘:’ token
src/ast.hpp:1803: error: expected primary-expression before ‘}’ token
src/ast.hpp:1803: error: expected ‘;’ before ‘}’ token
src/ast.hpp:1803: error: expected primary-expression before ‘}’ token
src/ast.hpp:1803: error: expected ‘)’ before ‘}’ token
src/ast.hpp:1803: error: expected primary-expression before ‘}’ token
src/ast.hpp:1803: error: expected ‘;’ before ‘}’ token
src/ast.hpp: In member function ‘virtual size_t Sass::Compound_Selector::hash()’:
src/ast.hpp:2750: error: ‘template<class T> class Sass::Vectorized’ used without template parameters
src/ast.hpp: In member function ‘virtual size_t Sass::Selector_List::hash()’:
src/ast.hpp:2997: error: ‘template<class T> class Sass::Vectorized’ used without template parameters
src/ast.hpp: In member function ‘virtual void Sass::Selector_List::set_media_block(Sass::Media_Block*)’:
src/ast.hpp:3014: error: expected initializer before ‘:’ token
src/ast.hpp:3017: error: expected primary-expression before ‘}’ token
src/ast.hpp:3017: error: expected ‘;’ before ‘}’ token
src/ast.hpp:3017: error: expected primary-expression before ‘}’ token
src/ast.hpp:3017: error: expected ‘)’ before ‘}’ token
src/ast.hpp:3017: error: expected primary-expression before ‘}’ token
src/ast.hpp:3017: error: expected ‘;’ before ‘}’ token
src/ast.hpp: In member function ‘virtual bool Sass::Selector_List::has_placeholder()’:
src/ast.hpp:3019: error: expected initializer before ‘:’ token
src/ast.hpp:3022: error: expected primary-expression before ‘return’
src/ast.hpp:3022: error: expected ‘;’ before ‘return’
src/ast.hpp:3022: error: expected primary-expression before ‘return’
src/ast.hpp:3022: error: expected ‘)’ before ‘return’
src/ast.cpp: In member function ‘virtual bool Sass::Selector_List::find(bool (*)(Sass::AST_Node_Obj))’:
src/ast.cpp:35: error: expected initializer before ‘:’ token
src/ast.cpp:39: error: expected primary-expression before ‘return’
src/ast.cpp:39: error: expected ‘;’ before ‘return’
src/ast.cpp:39: error: expected primary-expression before ‘return’
src/ast.cpp:39: error: expected ‘)’ before ‘return’
src/ast.cpp: In member function ‘virtual bool Sass::Compound_Selector::find(bool (*)(Sass::AST_Node_Obj))’:
src/ast.cpp:45: error: expected initializer before ‘:’ token
src/ast.cpp:49: error: expected primary-expression before ‘return’
src/ast.cpp:49: error: expected ‘;’ before ‘return’
src/ast.cpp:49: error: expected primary-expression before ‘return’
src/ast.cpp:49: error: expected ‘)’ before ‘return’
src/ast.cpp: In member function ‘virtual void Sass::Arguments::set_delayed(bool)’:
src/ast.cpp:98: error: expected initializer before ‘:’ token
src/ast.cpp:102: error: expected primary-expression before ‘}’ token
src/ast.cpp:102: error: expected ‘)’ before ‘}’ token
src/ast.cpp:102: error: expected primary-expression before ‘}’ token
src/ast.cpp:102: error: expected ‘;’ before ‘}’ token
src/ast.cpp: In member function ‘virtual bool Sass::Compound_Selector::has_parent_ref() const’:
src/ast.cpp:171: error: expected initializer before ‘:’ token
src/ast.cpp:174: error: expected primary-expression before ‘return’
src/ast.cpp:174: error: expected ‘;’ before ‘return’
src/ast.cpp:174: error: expected primary-expression before ‘return’
src/ast.cpp:174: error: expected ‘)’ before ‘return’
src/ast.cpp: In member function ‘virtual bool Sass::Compound_Selector::has_real_parent_ref() const’:
src/ast.cpp:179: error: expected initializer before ‘:’ token
src/ast.cpp:182: error: expected primary-expression before ‘return’
src/ast.cpp:182: error: expected ‘;’ before ‘return’
src/ast.cpp:182: error: expected primary-expression before ‘return’
src/ast.cpp:182: error: expected ‘)’ before ‘return’
src/ast.cpp: In member function ‘virtual bool Sass::Compound_Selector::is_superselector_of(Sass::Selector_List_Obj, std::string)’:
src/ast.cpp:846: error: expected initializer before ‘:’ token
src/ast.cpp:849: error: expected primary-expression before ‘return’
src/ast.cpp:849: error: expected ‘;’ before ‘return’
src/ast.cpp:849: error: expected primary-expression before ‘return’
src/ast.cpp:849: error: expected ‘)’ before ‘return’
src/ast.cpp: In member function ‘Sass::Selector_List* Sass::Complex_Selector::resolve_parent_refs(std::vector<Sass::SharedImpl<Sass::Selector_List>, std::allocator<Sass::SharedImpl<Sass::Selector_List> > >&, Sass::Backtraces&, bool)’:
src/ast.cpp:1408: error: expected initializer before ‘:’ token
src/ast.cpp:2226: error: expected primary-expression at end of input
src/ast.cpp:2226: error: expected ‘;’ at end of input
src/ast.cpp:2226: error: expected primary-expression at end of input
src/ast.cpp:2226: error: expected ‘)’ at end of input
src/ast.cpp:2226: error: expected statement at end of input
src/ast.cpp:2226: error: expected ‘}’ at end of input
src/ast.cpp:2226: error: expected ‘}’ at end of input
src/ast.cpp: At global scope:
src/ast.cpp:2226: error: expected ‘}’ at end of input
src/units.hpp:11: warning: ‘Sass::PI’ defined but not used
make: *** [src/ast.o] Error 1
rake aborted!
Command failed with status (2): [make lib/libsass.so...]
/usr/local/rvm/gems/ruby-2.6.2/gems/sassc-2.0.1/lib/tasks/libsass.rb:31:in `block (2 levels) in <top (required)>'
/usr/local/rvm/gems/ruby-2.6.2/gems/sassc-2.0.1/lib/tasks/libsass.rb:13:in `block (3 levels) in <top (required)>'
/usr/local/rvm/gems/ruby-2.6.2/gems/sassc-2.0.1/lib/tasks/libsass.rb:12:in `block (2 levels) in <top (required)>'
Tasks: TOP => lib/libsass.so
(See full trace by running task with --trace)

rake failed, exit code 1

Gem files will remain installed in /usr/local/rvm/gems/ruby-2.6.2/gems/sassc-2.0.1 for inspection.
Results logged to /usr/local/rvm/gems/ruby-2.6.2/extensions/x86_64-linux/2.6.0/sassc-2.0.1/gem_make.out

经排查,是因为GCC的版本过低导致的。

按照这个步骤,检查下GCC版本,如果是同样的版本和报错,那么可以参考以下的解决方法:

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[root@localhost ~]# gcc --version | head -n1
gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23)

如果GCC是这个版本,那就安装新版本的的GCC:

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yum install centos-release-scl-rh
yum install devtoolset-7-gcc devtoolset-7-gcc-c++ devtoolset-7-binutils

安装好以后,再次配置GCC环境并检查版本:

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[root@localhost ~]# cat << _EOF_ > /etc/profile.d/devtoolset.sh
> #!/bin/bash
> source scl_source enable devtoolset-7
> _EOF_
[root@localhost ~]#
[root@localhost ~]# gcc --version | head -n1
gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23)
[root@localhost ~]# cat /etc/profile.d/devtoolset.sh
#!/bin/bash
source scl_source enable devtoolset-7
[root@localhost ~]# source /etc/profile.d/devtoolset.sh
[root@localhost ~]# gcc --version | head -n1
gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)

确认GCC配置好以后,再次执行bundle或者执行gem install sassc来安装即可。

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