How To Check Compiler Surpported Header Object. For Example I Have Tried To Do This Which Does Not Seem To Output Anything Meaningful: "gcc dumpspecs >> header.txt". Compiler Did Not Pass Anything In header.txt, I Need A Better Understanding About It. I Would Like To Know The Surpported Header Object In Mingw 4.9.2. Although When I Say "Header Object" I Means Example: <iostream><string> E.t.c. Thanks.
So by header object you mean header file. I have no idea what you expect that gcc command to do, but if you want to view the header files like <iostream>, <string>, etc., just search for them on your computer.
On Windows, you can do dir /s "string". For example, in MinGW, you might get three files like this:
C:\MinGW>dir /s "string"
...
Directory of C:\MinGW\include\c++\7.1.0
05/30/2017 04:51 AM 1,940 string
1 File(s) 1,940 bytes
Directory of C:\MinGW\include\c++\7.1.0\debug
05/30/2017 04:51 AM 33,654 string
1 File(s) 33,654 bytes
Directory of C:\MinGW\include\c++\7.1.0\experimental
05/30/2017 04:51 AM 2,927 string
1 File(s) 2,927 bytes
Look at either the normal version, or the debug version of the file in a file viewer.
PS: Mingw 4.9.2 is pretty old at this point. Even my version is a year+ old...