[LTP] LTP compilation broken with -fno-common

[Petr Vorel]

Hi,

LTP compilation breaks with -fno-common (we don't use as the default).
This is the default for GCC 10, is there a way to fix it or do we need to disable it?

Compilation on gcc-10 (or gcc-9 with CFLAGS="-fno-common":

gcc-9 -Werror=implicit-function-declaration -fno-common -g -O2 -fno-strict-aliasing -pipe -Wall -W -Wold-style-definition -W  -I../../include -I../../include -I../../include/old/   -L../../lib  tst_checkpoint_wait_timeout.c   -lltp -o tst_checkpoint_wait_timeout
/usr/lib64/gcc/x86_64-suse-linux/9/../../../../x86_64-suse-linux/bin/ld: ../../lib/libltp.a(tst_test.o):ltp.git/lib/../include/tst_test.h:325: multiple definition of `TCID'; /tmp/cc49yYO6.o:ltp.git/lib/tests/tst_strsig.c:27: first defined here
/usr/lib64/gcc/x86_64-suse-linux/9/../../../../x86_64-suse-linux/bin/ld: ../../lib/libltp.a(tst_sys_conf.o):ltp.git/lib/../include/tst_test.h:325: multiple definition of `TCID'; /tmp/cc49yYO6.o:ltp.git/lib/tests/tst_strsig.c:27: first defined here

It's somehow related to the "hack" in include/tst_test.h:

/*
 * This is a hack to make the testcases link without defining TCID
 */
extern const char *TCID;

Kind regards,
Petr