GCC中spec的问题
在gcc/gcc.c中有如下代码：static const struct compiler default_compilers[] =
{
/* Add lists of suffixes of known languages here.If those languages
were not present when we built the driver, we will hit these copies
and be given a more meaningful error than "file not used since
linking is not done".*/
{".m","#Objective-C", 0, 0, 0}, {".mi","#Objective-C", 0, 0, 0},
{".mm", "#Objective-C++", 0, 0, 0}, {".M", "#Objective-C++", 0, 0, 0},
{".mii", "#Objective-C++", 0, 0, 0},
{".cc", "#C++", 0, 0, 0}, {".cxx", "#C++", 0, 0, 0},
{".cpp", "#C++", 0, 0, 0}, {".cp", "#C++", 0, 0, 0},
{".c++", "#C++", 0, 0, 0}, {".C", "#C++", 0, 0, 0},
{".CPP", "#C++", 0, 0, 0}, {".ii", "#C++", 0, 0, 0},
{".ads", "#Ada", 0, 0, 0}, {".adb", "#Ada", 0, 0, 0},
{".f", "#Fortran", 0, 0, 0}, {".F", "#Fortran", 0, 0, 0},
{".for", "#Fortran", 0, 0, 0}, {".FOR", "#Fortran", 0, 0, 0},
{".ftn", "#Fortran", 0, 0, 0}, {".FTN", "#Fortran", 0, 0, 0},
{".fpp", "#Fortran", 0, 0, 0}, {".FPP", "#Fortran", 0, 0, 0},
{".f90", "#Fortran", 0, 0, 0}, {".F90", "#Fortran", 0, 0, 0},
{".f95", "#Fortran", 0, 0, 0}, {".F95", "#Fortran", 0, 0, 0},
{".f03", "#Fortran", 0, 0, 0}, {".F03", "#Fortran", 0, 0, 0},
{".f08", "#Fortran", 0, 0, 0}, {".F08", "#Fortran", 0, 0, 0},
{".r", "#Ratfor", 0, 0, 0},
{".p", "#Pascal", 0, 0, 0}, {".pas", "#Pascal", 0, 0, 0},
{".java", "#Java", 0, 0, 0}, {".class", "#Java", 0, 0, 0},
{".zip", "#Java", 0, 0, 0}, {".jar", "#Java", 0, 0, 0},
/* Next come the entries for C.*/
{".c", "@c", 0, 1, 1},
{"@c",
/* cc1 has an integrated ISO C preprocessor.We should invoke the
external preprocessor if -save-temps is given.*/
"%{E|M|MM:%(trad_capable_cpp) %(cpp_options) %(cpp_debug_options)}\
%{!E:%{!M:%{!MM:\
%{traditional|ftraditional:\
%eGNU C no longer supports -traditional without -E}\
%{!combine:\
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) \
%(cpp_options) -o %{save-temps:%b.i} %{!save-temps:%g.i} \n\
cc1 -fpreprocessed %{save-temps:%b.i} %{!save-temps:%g.i} \
%(cc1_options)}\
%{!save-temps:%{!traditional-cpp:%{!no-integrated-cpp:\
cc1 %(cpp_unique_options) %(cc1_options)}}}\
%{!fsyntax-only:%(invoke_as)}} \
%{combine:\
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) \
%(cpp_options) -o %{save-temps:%b.i} %{!save-temps:%g.i}}\
%{!save-temps:%{!traditional-cpp:%{!no-integrated-cpp:\
cc1 %(cpp_unique_options) %(cc1_options)}}\
%{!fsyntax-only:%(invoke_as)}}}}}}", 0, 1, 1},
{"-",
"%{!E:%e-E or -x required when input is from standard input}\
%(trad_capable_cpp) %(cpp_options) %(cpp_debug_options)", 0, 0, 0},
{".h", "@c-header", 0, 0, 0},
{"@c-header",
/* cc1 has an integrated ISO C preprocessor.We should invoke the
external preprocessor if -save-temps is given.*/
"%{E|M|MM:%(trad_capable_cpp) %(cpp_options) %(cpp_debug_options)}\
%{!E:%{!M:%{!MM:\
%{save-temps|traditional-cpp|no-integrated-cpp:%(trad_capable_cpp) \
%(cpp_options) -o %{save-temps:%b.i} %{!save-temps:%g.i} \n\
cc1 -fpreprocessed %{save-temps:%b.i} %{!save-temps:%g.i} \
%(cc1_options)\
-o %g.s %{!o*:--output-pch=%i.gch}\
%W{o*:--output-pch=%*}%V}\
%{!save-temps:%{!traditional-cpp:%{!no-integrated-cpp:\
cc1 %(cpp_unique_options) %(cc1_options)\
-o %g.s %{!o*:--output-pch=%i.gch}\
%W{o*:--output-pch=%*}%V}}}}}}", 0, 0, 0},
{".i", "@cpp-output", 0, 1, 0},
{"@cpp-output",
"%{!M:%{!MM:%{!E:cc1 -fpreprocessed %i %(cc1_options) %{!fsyntax-only:%(invoke_as)}}}}", 0, 1, 0},
{".s", "@assembler", 0, 1, 0},
{"@assembler",
"%{!M:%{!MM:%{!E:%{!S:as %(asm_debug) %(asm_options) %i %A }}}}", 0, 1, 0},
{".sx", "@assembler-with-cpp", 0, 1, 0},
{".S", "@assembler-with-cpp", 0, 1, 0},
{"@assembler-with-cpp",
#ifdef AS_NEEDS_DASH_FOR_PIPED_INPUT
"%(trad_capable_cpp) -lang-asm %(cpp_options) -fno-directives-only\
%{E|M|MM:%(cpp_debug_options)}\
%{!M:%{!MM:%{!E:%{!S:-o %|.s |\n\
as %(asm_debug) %(asm_options) %|.s %A }}}}"
#else
"%(trad_capable_cpp) -lang-asm %(cpp_options) -fno-directives-only\
%{E|M|MM:%(cpp_debug_options)}\
%{!M:%{!MM:%{!E:%{!S:-o %|.s |\n\
as %(asm_debug) %(asm_options) %m.s %A }}}}"
#endif
, 0, 1, 0},
#include "specs.h" /* Mark end of table.*/
{0, 0, 0, 0, 0} //结束标识
};
现在的问题是：
1.{".m","#Objective-C", 0, 0, 0}中"#Objective-C"表示什么意思？#有什么特殊意义吗？
2.{".h", "@c-header", 0, 0, 0},
{"@c-header",
//省略
},
中"@c-header"好像表示的是一个SPEC的“名称”，其中的@符号有什么特殊含义？
上述这些问题需要从哪里获取帮助？请各位指点。 回复 1# lazy_linux
https://gcc.gnu.org/onlinedocs/gcc/Spec-Files.html#Spec-Files
回复 2# EricFisher
谢谢版主，看到了如下的描述：
@language：表示该后缀是某个已知语言language的别名，例如：
.ZZ:
@c++
表示.ZZ文件实际上是一个c++的源文件
#name ：用来生成“name compiler not installed on this system.”的错误信息。
感谢！
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