g++ can't find headers even when it's specified

Question

So basically I have some really simple code that includes <BigIntegerLibrary.hh> which resides in /Users/wen/Projects/include/bigint. I was compiling with this:

g++ main.cpp -o Main -I/Users/wen/Projects/include/bigint

but it reported a fatal error that it could not find the file. Am I doing it right? Thanks!

main.cpp:4:10: fatal error: 'BigIntegerLibrary.hh' file not found

Yes, I have, it worked but I can't find out why this couldn't. — ihsoy ih, Dec 18 '12 at 17:26
@TrevorHickey Deducing from the context, this seems OS X, not Windows. Windows uses backslashes, not slashes, and the GNU toolchain is typically disused on Windows. — , Dec 18 '12 at 17:28
How do you quote include directive? You should not use angle brackets if absolute path. — Dims, Dec 18 '12 at 17:28
do `ls /Users/wen/Projects/include/bigint/BigIntegerLibrary.hh` and type the result here — Dims, Dec 18 '12 at 17:31
`// This header file includes all of the library header files. #include "NumberlikeArray.hh" #include "BigUnsigned.hh" #include "BigInteger.hh" #include "BigIntegerAlgorithms.hh" #include "BigUnsignedInABase.hh" #include "BigIntegerUtils.hh"` The file is there D: — ihsoy ih, Dec 18 '12 at 17:32
also try to add slash at the end, but not sure this can matter — Dims, Dec 18 '12 at 17:35

score 6 · Accepted Answer · answered Dec 18 '12 at 17:29

6

Try

#include "BigIntegerLibrary.hh"

If you specify the #included file with angle brackets (#include <includeFile.h>) the compiler will try to find it in a predefined location whereas if you use #include "includeFile" the compiler first tries the paths you specified with the -I compiler option.

The -I compiler option cannot be used to specify where the <...> files are.

answered Dec 18 '12 at 17:29

René Nyffenegger

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Are you sure you have the case of the letters in the path right? Did you double check with `ls /Users/wen/Projects/include/bigint/BigIntegerLibrary.hh`? – René Nyffenegger Dec 18 '12 at 17:32
Yup, double checked. When I did a `cat` on the path it showed the contents. – ihsoy ih Dec 18 '12 at 17:35
1

-I can change where <...> files are, it modifies the search path. Evidence: the manual, and that it works on my system. – bstamour Dec 18 '12 at 23:51

score 0 · Answer 2 · answered Dec 18 '12 at 17:29

0

If the path is correct g++ should see the files.

If you use absolute path in include directive, you should change quotation:

#include "/Users/wen/Projects/include/bigint/BigIntegerLibrary.hh"

answered Dec 18 '12 at 17:29

Dims

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I did change it when I used absolute, but now if I use any kind of bracket it won't work when I use -I. – ihsoy ih Dec 18 '12 at 17:31
double check the path; it should work if it is correct and readeable – Dims Dec 18 '12 at 17:33

g++ can't find headers even when it's specified

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