Re: Linking issue on MacOS Catalina (using XCode)

As a follow up: I tried running  

>> clang++ -g2 -O3 -l /usr/local/include /usr/local/lib/libcryptopp.a -WI,-L

And got the error:

ld: library not found for -l/usr/local/include
clang: error: linker command failed with exit code 1 (use -v to see 
invocation)

It seems like the intention of this command was to ask clang to link to the 
include path to crypto++ but clang doesn't have the include path on in its 
build tools? Further suggestions or clarifications would be great, I tried 
googling again and couldn't find anything.
On Thursday, September 16, 2021 at 12:04:00 PM UTC-7 Samyukta Yagati wrote:

> I'm new to using clang, so to clarify: in my case, I should try "clang++ 
> -g2 -O3 -I /usr/local/include cryptopp -Wl,-L" (where cryptopp is a 
> subdirectory of include)? Also, is "-Wl,/usr/local/lib -o test.exe" 
> intended to be shorthand for "clang++ -g2 -O3 -Wl,/usr/local/lib -o 
> test.exe"? (and, relatedly, what output should I expect in test.exe?)
>
>
>
> On Wednesday, September 15, 2021 at 4:58:05 PM UTC-7 Jeffrey Walton wrote:
>
>> On Wed, Sep 15, 2021 at 6:39 PM Samyukta Yagati <[email protected]> 
>> wrote:
>> >
>> > I installed Crypto++ from source as follows:
>> >
>> > git clone https://github.com/weidai11/cryptopp.git
>> > cd cryptopp
>> > Uncommented the CXX flag line in GNUmakefile that adds "-stdlib=libc++" 
>> because I am using XCode.
>> > make -j 8 (8 = value of $(nproc) on my machine if it were linux)
>> > sudo make install
>> >
>> > The make and install complete without errors. I confirmed that 
>> /usr/local/lib contains libcryptopp.a.
>> >
>> > When I try to use libcryptopp in a project (in a different directory 
>> from the cryptopp install), clang (Apple Clang 12.0.0) can't find it. I get 
>> the following error message:
>> >
>> > + LD lib/crypto_bench
>> > ld: library not found for -l:libcryptopp.a
>> > clang: error: linker command failed with exit code 1 (use -v to see 
>> invocation)
>> >
>> > ...
>> >
>> > I also tried updating my PATH variable in bash_profile with the 
>> location of libcryptopp as follows, then source'd bash_profile again:
>> >
>> > export PATH="/usr/local/lib:$PATH"
>> >
>> > However, this resulted in the same error as before when I tried to 
>> compile the project. I've spent several hours googling and haven't been 
>> able to find a fix, and I'm wary of manually symlinking the file because it 
>> can break other installs on my laptop. Any help with fixing this issue 
>> would be much appreciated.
>>
>> When linking, use -L to provide a path to the linker. That is, you
>> invoke ld directly. If you are passing the linker option through the
>> compiler driver, then use -Wl,-L -Wl,<path>
>>
>> So you would probably use something like:
>>
>> clang++ -g2 -O3 -I /usr/local/include test.cxx -Wl,-L
>> -Wl,/usr/local/lib -o test.exe
>>
>> You would have to do the same on, say, CentOS, Fedora and Red Hat. Red
>> Hat does not put /usr/local on-path for the build tools.
>>
>> Jeff
>>
>

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