Re: [Boost-users] Specifying library locations for g++

From: David Daeschler (daveregs_at_[hidden])
Date: 2007-05-30 13:29:27

After following this thread lower down, I think that you're confusing -l
(lower case l) and -L (capital L).  Lower case -l specifies the
individual library you are linking to (ex boost_filesystem).  Capital -L
specifies a directory or directories (you can use -L and -l as many
times as you have to) where the linker should look for the libraries
specified by the lower case -l's

On Wed, 2007-05-30 at 10:15 -0700, Scott Meyers wrote:
> Vladimir Prus wrote:
> > What is the exact command line you've used, and what is the exact error
> > you've got? 
> 
> D:\Temp>g++ -Wall -O3 -ID:\C++\Boost\Current -o boostbuildtest.exe 
> boostbuildtest.cpp -lboost_filesystem -lboost_regex
> d:\apps\msys\1.0\mingw\bin\..\lib\gcc\mingw32\4.1.1\..\..\..\..\mingw32\bin\ld.exe: 
> cannot find -lboost_filesystem
> collect2: ld returned 1 exit status
> 
> Reversing the order of the libraries to link yields this:
> 
> D:\Temp>g++ -Wall -O3 -ID:\C++\Boost\Current -o boostbuildtest.exe 
> boostbuildtest.cpp -lboost_regex -lboost_filesystem
> d:\apps\msys\1.0\mingw\bin\..\lib\gcc\mingw32\4.1.1\..\..\..\..\mingw32\bin\ld.exe: 
> cannot find -lboost_regex
> collect2: ld returned 1 exit status
> 
> This suggests that whichever library is listed first is the one leading to the 
> linker quitting.
> 
> Specifying full paths doesn't help:
> 
> D:\Temp>g++ -Wall -O3 -ID:\C++\Boost\Current -o boostbuildtest.exe 
> boostbuildtest.cpp -lc:\boost_current\lib\boost_regex -lc:\boost_
> current\lib\boost_filesystem
> d:\apps\msys\1.0\mingw\bin\..\lib\gcc\mingw32\4.1.1\..\..\..\..\mingw32\bin\ld.exe: 
> cannot find -lc:\boost_current\lib\boost_regex
> collect2: ld returned 1 exit status
> 
> But the libraries are there:
> 
> D:\Temp>ls c:\boost_current\lib | grep filesystem | grep mgw
> boost_filesystem-mgw41-1_34.a
> boost_filesystem-mgw41-d-1_34.a
> boost_filesystem-mgw41-mt-1_34.a
> boost_filesystem-mgw41-mt-d-1_34.a
> libboost_filesystem-mgw41-1_34.a
> libboost_filesystem-mgw41-d-1_34.a
> libboost_filesystem-mgw41-mt-1_34.a
> libboost_filesystem-mgw41-mt-d-1_34.a
> libboost_filesystem-mgw41-mt-s-1_34.a
> libboost_filesystem-mgw41-mt-sd-1_34.a
> libboost_filesystem-mgw41-s-1_34.a
> libboost_filesystem-mgw41-sd-1_34.a
> 
> D:\Temp>ls c:\boost_current\lib | grep regex | grep mgw
> libboost_regex-mgw41-1_34.a
> libboost_regex-mgw41-d-1_34.a
> libboost_regex-mgw41-mt-1_34.a
> libboost_regex-mgw41-mt-d-1_34.a
> libboost_regex-mgw41-mt-s-1_34.a
> libboost_regex-mgw41-mt-sd-1_34.a
> libboost_regex-mgw41-s-1_34.a
> libboost_regex-mgw41-sd-1_34.a
> 
> Suggestions?
> 
> Thanks,
> 
> Scott
> 
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