Hello CMake users
We are building a CGI for a chrooted web environment. The resulting binary
must not use any dynamic libs, but link everything statically (also libc and
libstdc++ etc.).
We currently build this binary with:
LDFLAGS = -static -lboost_regex -lz ../libs/bla.a
And the resulting gcc command line is:
g++ -o ui foo.o -L/usr/local/lib -static -lboost_regex -lz ../libs/bla.a
The resulting binary has no dynamic dependencies at all (which is good):
# ldd ui
ldd: ui: not a dynamic ELF executable
First shot with CMake 2.6.3:
set(Boost_USE_STATIC_LIBS ON)
find_package(Boost 1.34.1 COMPONENTS regex)
target_link_libraries(ui bla-static libz.a ${Boost_LIBRARIES} libthr.a)
The resulting gcc command line is:
/usr/bin/c++ -fPIC CMakeFiles/ui.dir/foo.cpp.o -o ui -L/usr/local/lib
libbla-static.a ../libs/bla.a -Wl,-Bstatic -lz -Wl,-Bdynamic
/usr/local/lib/libboost_regex.a -Wl,-Bstatic -lthr -Wl,-Bdynamic
-Wl,-rpath,/usr/local/lib
The first error is that the static boost lib is linked with the dynamic
flag, but anyway.
Next try:
target_link_libraries(ui bla-static libz.a libboost_regex.a libthr.a)
Resulting gcc line:
/usr/bin/c++ -fPIC CMakeFiles/ui.dir/foo.cpp.o -o ui -L/usr/local/lib
libbla-static.a ../libs/bla.a -Wl,-Bstatic -lz -lboost_regex -Wl,-Bdynamic
-Wl,-rpath,/usr/local/lib
The boost lib is now linked statically, but the flag "-Wl,-Bdynamic" at the
end still creates a dynamic linked executable:
# ldd ui:
libstdc++.so.5 => /usr/lib/libstdc++.so.5 (0x2861a000)
libm.so.4 => /lib/libm.so.4 (0x286e5000)
libc.so.6 => /lib/libc.so.6 (0x286fb000)
So my question is how to avoid any dynamic linking at all.
I found this bug report http://www.vtk.org/Bug/view.php?id=1644 that says
that this has been implemented - but how?
Thanks for your help.
James
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