Link error of undefined reference to `pthread_create' with Icx compilers

I used Intel Icx compilers but at the end I met this error

/usr/bin/ld: /home/jczhang/openfoam/platforms/linux64IcxDPInt32Opt/lib/libOpenFOAM.so: undefined reference to `pthread_create'

From the grep output, It seems it is because linux64Icx/c++ doesn't have -pthread?

$ pwd
/ccs/home/jczhang/openfoam/wmake/rules
$ grep -r pthread *
darwin64Clang/c++:c++ARCH    := -m64 -pthread -ftrapping-math
linux64Amd/c++:c++ARCH    := -m64 -pthread
linux64Clang/c++:c++ARCH    := -m64 -pthread
linux64Cray/c++:c++ARCH    := -m64 -pthread
linux64Gcc/c++:c++ARCH    := -m64 -pthread
linux64Icc/c++:c++ARCH    := -pthread -fp-trap=common -fp-model precise
linux64Mingw/c++:c++ARCH    := -m64 -pthread
linuxARM64Arm/c++:c++ARCH    := -mcpu=native -pthread
linuxARM64Clang/c++:c++ARCH    := -pthread
linuxARM64Fujitsu/c++:c++ARCH    := -pthread
linuxARM64Gcc/c++:c++ARCH    := -pthread
linuxClang/c++:c++ARCH    := -m32 -pthread
linuxGcc/c++:c++ARCH    := -m32 -pthread
linuxIcc/c++:c++ARCH    := -pthread -fp-trap=common -fp-model precise

added community label

@Pawan @Mattijs

Sounds correct. Did start off from a copy of linux64Icc/ as your rules?

FYI, I modified c++ and the error disappeared.

diff --git a/wmake/rules/linux64Icx/c++ b/wmake/rules/linux64Icx/c++
index 0b834e99..25526515 100644
--- a/wmake/rules/linux64Icx/c++
+++ b/wmake/rules/linux64Icx/c++
@@ -1,7 +1,7 @@
 #------------------------------------------------------------------------------
 include $(GENERAL_RULES)/Icx/c++
 
-c++ARCH    := -fp-model precise
+c++ARCH    := -pthread -fp-model precise
 
 ifneq (,$(strip $(WM_COMPILE_OPTION)))
     sinclude $(DEFAULT_RULES)/c++$(WM_COMPILE_OPTION)

assigned to @mark

closed via commit 1cb61b90

mentioned in commit 1cb61b90