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capnproto: build position independent code

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The recipe produces static archives only, and does not compile them PIC, so
linking capnp or kj into a shared library fails:

  libkj.a(exception.c++.o): relocation R_X86_64_TPOFF32 against
  `kj::(anonymous namespace)::threadLocalCallback' can not be used when making
  a shared object; local-exec is incompatible with -shared

kj/exception.c++ has a file-scope thread_local, which non-PIC code compiles to
the local-exec TLS model. A shared object cannot use that model, so the link
fails on any consumer that puts capnp inside a .so. Debian and Fedora do not
hit this because they ship shared libcapnp.

Set CMAKE_POSITION_INDEPENDENT_CODE. Packaging is unchanged: still static,
still no .so, no new packages and no ABI surface, only the code model differs.

Backport of the same change sent for master, where the recipe is 1.5.0.

Signed-off-by: Joel Winarske <joel.winarske@gmail.com>
Signed-off-by: Anuj Mittal <anuj.mittal@oss.qualcomm.com>
This commit is contained in:
Joel Winarske
2026-09-15 07:52:03 +05:30
committed by Anuj Mittal
parent 86fba2b580
commit aa32734876
1 changed files with 9 additions and 0 deletions
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meta-oe/recipes-devtools/capnproto/capnproto_1.4.0.bb
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@@ -19,8 +19,17 @@ CXXFLAGS:append:mips = " -latomic"
CXXFLAGS:append:powerpc = " -latomic"
CXXFLAGS:append:riscv32 = " -latomic"
# The build produces static archives only. Compile them position independent so
# they can be linked into shared libraries; without this any consumer that does
# so fails on the thread-local in kj/exception.c++, which non-PIC code compiles
# to the local-exec TLS model:
#
# libkj.a(exception.c++.o): relocation R_X86_64_TPOFF32 against
# `kj::(anonymous namespace)::threadLocalCallback' can not be used when making
# a shared object; local-exec is incompatible with -shared
EXTRA_OECMAKE += "\
-DBUILD_TESTING=OFF \
-DCMAKE_POSITION_INDEPENDENT_CODE=ON \
"
FILES:${PN}-compiler = "${bindir}"