How can I avoid dynamically linking with libstdc++?
or, how can I keep -lstdc++ out of $postdeps?
When I run "./configure CXXFLAGS=-static-libstdc++",
_LT_SYS_HIDDEN_LIBDEPS (in libtool.m4) runs the following command:
$CC -shared $CFLAGS -v conftest.$objext 2>&1 | $GREP -v "^Configured
with:" | $GREP "\-L"
Which expands to:
c++ -shared -static-libstdc++ -std=c++11 -v conftest.o 2>&1 |
/bin/grep -v ^Configured with: | /bin/grep -L
When I run that command myself, the output is:
/usr/lib/gcc/x86_64-linux-gnu/6/collect2 -plugin
/usr/lib/gcc/x86_64-linux-gnu/6/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/6/lto-wrapper
-plugin-opt=-fresolution=/tmp/cc4DFGDe.res
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc_s --sysroot=/ --build-id --eh-frame-hdr
-m elf_x86_64 --hash-style=gnu -shared
/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/6/crtbeginS.o
-L/usr/lib/gcc/x86_64-linux-gnu/6
-L/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/6/../../../../lib
-L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu
-L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/6/../../.. conftest.o
-Bstatic -lstdc++ -Bdynamic -lm -lgcc_s -lc -lgcc_s
/usr/lib/gcc/x86_64-linux-gnu/6/crtendS.o
/usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/crtn.o
So the output contains "-Bstatic -lstdc++",
but $postdeps in the generated ./libtool is:
postdeps="-lstdc++ -lm -lgcc_s -lc -lgcc_s"
So although conftest.o respects -static-libstdc++ and is not dynamically
linked with libstdc++,
the rest of my project, when eventually built, *is* :-(
Now, if I edit ./libtool and set postdeps="", my project builds just
fine (as far as I can tell ...). The compiler/linker already
adds/doesn't add those dynamic links as appropriate. So is that an
option? Is there a recommended way to disable _LT_SYS_HIDDEN_LIBDEPS?
Alternatively, should _LT_SYS_HIDDEN_LIBDEPS respect the -B option --
either adding it to $postdeps or ignoring other options between -Bstatic
and -Bdynamic?
Thanks!
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