awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

[DaTurr3t]

With gawk >= 5.0.0, lots of warnings appear when running make on a project. Most newer Distros only ship with gawk >= 5.0.0. AFAIK the fix should just be as simple as replacing "\#error" with "#error" in all awk expressions:

+ cd /home/devuser/projects/rpm-mdis/rpmbuild/BUILD/proj-mdis5/myproj
+ make
Getting Compiler/Linker settings from Linux Kernel Makefile
Cleaning .kernelsubdirs
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_mdis_kernel +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_mdis_kernel created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_bbis_kernel +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_bbis_kernel created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_oss +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_oss created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_dbg +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_dbg created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_desc +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_desc created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_pld +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_pld created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_pld_sw +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_pld_sw created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_id +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_id created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_id_sw +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_id_sw created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_mbuf +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_mbuf created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_smb_port +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_smb_port created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_smb_port_io +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_smb_port_io created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_chameleon +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_chameleon created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_chameleon_io +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_chameleon_io created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_ll_z17 +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_ll_z17 created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_ll_xm01bc +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_ll_xm01bc created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_ll_smb2 +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_ll_smb2 created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_ll_z15 +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_ll_z15 created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_ll_z82 +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_ll_z82 created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_bb_chameleon_isa +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_bb_chameleon_isa created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator

++++++++ Preparing non-debug version of module men_bb_smb2 +++++++++++
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
Directory OBJ/nodbg/men_bb_smb2 created
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
awk: cmd. line:1: warning: regexp escape sequence `\#' is not a known regexp operator
++++++++ Building kernel modules ++++++++++
...

Thank you Matthias

[mad-jrodriguez]

The issue seems to be fixed. I have replaced the awk command with a sed command that works in the same way.

The new command have been tested in some Linux versions.

A new PR have been created for fixing it.

[mad-jrodriguez]

Closing issue as the PR has been merged