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package/grpc: fix build on ubuntu gcc 4.8

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gcc 4.8 on ubuntu 14.04 does some broken optimization at link-time
which causes grpc to create a grpc_cpp_plugin which quits because
of a failing assertion. The created plugin is itself used during
compilation which lets the build fail.
With the added -Wl,--no-as-needed flag the LTO is disabled and grpc
compiles successfully.

fixes:
- http://autobuild.buildroot.net/results/b554f6f2fb66892273f7520ad6e36923557b229e
- http://autobuild.buildroot.net/results/3ebb2880b9b3fd5154979016391dde897e2c039c
- http://autobuild.buildroot.net/results/c2078e821e0728fe980be2c849c25d82e791a4c2

Signed-off-by: Michael Nosthoff <buildroot@heine.tech>
[yann.morin.1998@free.fr: rewrap the comment]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Michael Nosthoff 2020-09-15 18:11:07 +02:00 committed by Yann E. MORIN
parent 060275b683
commit 19dfe7f6e7
1 changed files with 8 additions and 0 deletions
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8
package/grpc/grpc.mk
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@ -72,5 +72,13 @@ HOST_GRPC_CONF_OPTS = \
-DgRPC_ZLIB_PROVIDER=package \
-DgRPC_ABSL_PROVIDER=package
# With gcc 4.8 (at least on ubuntu) there is a bug in LTO which breaks
# the linkage of the grpc_cpp_plugin with libprotobuf and pthread. This
# additional flag fixes this.
ifeq ($(BR2_HOST_GCC_AT_LEAST_4_9),)
HOST_GRPC_CONF_OPTS += \
-DCMAKE_EXE_LINKER_FLAGS="$(HOST_LDFLAGS) -Wl,--no-as-needed"
endif
$(eval $(cmake-package))
$(eval $(host-cmake-package))