Bug 595500 – dev-libs/DirectFB-1.7.6 - /usr/libexec/gcc/armv7a-hardfloat-linux-gnueabi/ld: warning: libstdc++.so.6, needed by ../src/.libs/libdirectfb.so, not found (try using -rpath or -rpath-link)

• Status: RESOLVED DUPLICATE of bug 291383
• Product: Gentoo Linux

[Description Luke-Jr 2016-09-29 08:09:51 UTC]

Created attachment 448396 [details]
build log

armv7a-hardfloat-linux-gnueabi-emerge -1 =dev-libs/DirectFB-1.7.6 fails with attached build log

It looks like the linker is refusing to find libstdc++.so.6 in the cross-toolchain dirs outside sysroot, but only when it is being referenced via another .so

My old system had a cross-built 1.6.3-r1, but I cannot reproduce it, so it's possible I had monkey-patched it somehow.

Adding -lstdc++ to LDFLAGS hackily gets a successful build... :/

[Comment 1 SpanKY 2016-12-08 22:29:03 UTC]

the problem is that they build & link in C++ files to libdirectfb.so, but use the C compiler to do the final link, so the final libdirectfb.so is missing C++ linkage.

it isn't a bug in the linker or the cross-compiler.

[Comment 2 Luke-Jr 2016-12-09 00:38:19 UTC]

(In reply to SpanKY from comment #1)
> the problem is that they build & link in C++ files to libdirectfb.so, but
> use the C compiler to do the final link, so the final libdirectfb.so is
> missing C++ linkage.

/usr/libexec/gcc/armv7a-hardfloat-linux-gnueabi/ld: warning: libstdc++.so.6, needed by ../src/.libs/libdirectfb.so, not found (try using -rpath or -rpath-link)

Doesn't this indicate that libdirectfb.so does in fact have C++ linkage, but it is the cross-compiler that is failing to find the library in its path somehow? Or am I misunderstanding the warning?

[Comment 3 SpanKY 2016-12-10 05:39:35 UTC]

(In reply to Luke-Jr from comment #2)

yeah, you're right of course

unfortunately this reminds me that we've had a long standing bug here

*** This bug has been marked as a duplicate of bug 291383 ***