/usr/bin/ld: attempted static link of dynamic object `/usr/lib64/libm.so'

Question

I'm not experienced at building with gcc at all and now require some help. I've a code that is being built with the following options

gcc \
    -g myCode.C \
    -O \
    -o myCode \
    -I. \
    -L. \
    -L/usr/lib64 \
    -lstdc++ \
    -Wreturn-type \
    -Wswitch \
    -Wcomment \
    -Wformat \
    -Wchar-subscripts \
    -Wparentheses \
    -Wpointer-arith \
    -Wcast-qual \
    -Woverloaded-virtual \
    -Wno-write-strings /usr/lib64/libm.so \
    -Wno-deprecated

When compiling myCode.C on redhat 6 machine it is not working on older versions of the OS throwing errors

/usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.9' not found
/usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.11' not found

To fix this issue, I've tried to add -static build option to make all dynamic linking libraries as static, but have some build error which i dont understand :(

/usr/bin/ld: attempted static link of dynamic object `/usr/lib64/libm.so'
collect2: ld returned 1 exit status

How do I make my code to work on older version of redhat rather than only on 6 and newer ?? what build options should I add/remove ?

Solution

/usr/lib64/libm.so is a dynamic library. Since you link explicitly with it, -static doesn't force using the static version (libm.a) You are trying to compile a C++ program so you should use g++. Passing the libstdc++ and libm libraries is not needed then. Also /usr/lib64 should be in your standard link path so is not needed.

So you should use:

g++ \
    -static \
    -g myCode.C \
    -O \
    -o myCode \
    -I. \
    -L. \
    -Wreturn-type \
    -Wswitch \
    -Wcomment \
    -Wformat \
    -Wchar-subscripts \
    -Wparentheses \
    -Wpointer-arith \
    -Wcast-qual \
    -Woverloaded-virtual \
    -Wno-write-strings \
    -Wno-deprecated

Comments

[ymonad]

remove /usr/lib64/libm.so from -Wno-write-strings /usr/lib64/libm.so and add -lm instead if necessary.

[user3544092]

@ymonad /usr/bin/ld: cannot find -lm

[user3544092]

compiled without errors but still have the same issue while running on older OS

[Arnout]

Of course, I forgot to add the -static to the command... Edited.