make -j3 binrpm-pkg fails on CentOS9 with unknown type name 'bool' in C90 or gnu=89

[qw3r3wq]

Hi, using testing or mainline release

config from: /boot/config-5.14.0-452.el9.x86_64

executing: make -j3 binrpm-pkg

modules enabled:
112 scripts/config -m TCP_CONG_PRAGUE
113 scripts/config -m NET_SCH_DUALPI2
114 scripts/config -m TCP_CONG_DCTCP
115 scripts/config -m TCP_CONG_BBR2
116 history
117 scripts/config --set-str CONFIG_LOCALVERSION "-prague-20240610"

linux-mainline-build]$ make -j3 binrpm-pkg
make -f ./Makefile
  DESCEND objtool
  DESCEND bpf/resolve_btfids
  CALL    scripts/atomic/check-atomics.sh
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  HDRTEST usr/include/linux/inet_diag.h
In file included from <command-line>:
./usr/include/linux/inet_diag.h:244:9: error: unknown type name ‘bool’
  244 |         bool    prague_enabled;
      |         ^~~~
make[4]: *** [usr/include/Makefile:106: usr/include/linux/inet_diag.hdrtest] Error 1
make[3]: *** [scripts/Makefile.build:552: usr/include] Error 2
make[2]: *** [Makefile:1898: usr] Error 2
make[2]: *** Waiting for unfinished jobs....
  CHK     kernel/kheaders_data.tar.xz
make[1]: *** [scripts/Makefile.package:66: binrpm-pkg] Error 2
make: *** [Makefile:1606: binrpm-pkg] Error 2

After adding #include <stdbool.h> to usr/include/linux/inet_diag.h

Got errors with

make[3]: *** No rule to make target 'certs/rhel.pem', needed by 'certs/x509_certificate_list'.  Stop.

That is due to copied */boot/config ** solved by:

scripts/config -s CONFIG_SYSTEM_TRUSTED_KEY ""
scripts/config -s CONFIG_MODULE_SIG_KEY ""

Now I see some errors with:

  CC      net/ipv4/inet_connection_sock.o
net/ipv4/inet_connection_sock.c: In function ‘inet_rtx_syn_ack’:
net/ipv4/inet_connection_sock.c:692:9: error: ISO C90 forbids mixed declarations and code [-Werror=declaration-after-statement]
  692 |         int err = req->rsk_ops->rtx_syn_ack(parent, req);
      |         ^~~
cc1: all warnings being treated as errors
make[4]: *** [scripts/Makefile.build:289: net/ipv4/inet_connection_sock.o] Error 1
make[3]: *** [scripts/Makefile.build:552: net/ipv4] Error 2

I have moved int err; before the function and it worked.

In general the main error, is that CentOS9 use C90 / std=gnu89 and your code is using newer C version, you should specify it in Makefile? Or other place?

[qw3r3wq]

after including:
#include <stdbool.h>
it looks to continue and stop at:

make[3]: *** No rule to make target 'certs/rhel.pem', needed by 'certs/x509_certificate_list'.  Stop.

which looks to be not prague issue.