https://bugs.llvm.org/show_bug.cgi?id=40796
Bug ID: 40796
Summary: -pthread should pass -lpthread to the linker
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: unassignedbugs at nondot.org
Reporter: mh+llvm at glandium.org
CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org
Apparently something changed in clang 9, that made -pthread not do anything
during linkage, per
https://gn.googlesource.com/gn/+/082fbe397d5217dc21b01c63c7f20eb6b77a3093%5E%21/#F0
:
clang-9: warning: argument unused during compilation: '-pthread'
[-Wunused-command-line-argument]
ld.lld: error: undefined symbol: pthread_create
>>> referenced by worker_pool.cc
>>> util/worker_pool.o:(WorkerPool::WorkerPool(unsigned
long)) in archive gn_lib.a
However, -pthread *is* meant to add -lpthread during linkage, per GCC
documentation:
https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html#Link-Options
-pthread
Link with the POSIX threads library. This option is supported on GNU/Linux
targets, most other Unix derivatives, and also on x86 Cygwin and MinGW targets.
On some targets this option also sets flags for the preprocessor, so it should
be used consistently for both compilation and linking.
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