/usr/bin/ld: anvil_clnt.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3999: multiple definition of `var_tlsp_clnt_policy'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3999: first defined here /usr/bin/ld: anvil_clnt.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3995: multiple definition of `var_tlsp_clnt_per_site'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3995: first defined here /usr/bin/ld: anvil_clnt.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3991: multiple definition of `var_tlsp_clnt_level'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3991: first defined here /usr/bin/ld: anvil_clnt.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3987: multiple definition of `var_tlsp_clnt_enforce_tls'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3987: first defined here /usr/bin/ld: anvil_clnt.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3983: multiple definition of `var_tlsp_clnt_use_tls'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3983: first defined here /usr/bin/ld: bounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3999: multiple definition of `var_tlsp_clnt_policy'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3999: first defined here /usr/bin/ld: bounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3995: multiple definition of `var_tlsp_clnt_per_site'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3995: first defined here /usr/bin/ld: bounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3991: multiple definition of `var_tlsp_clnt_level'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3991: first defined here /usr/bin/ld: bounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3987: multiple definition of `var_tlsp_clnt_enforce_tls'; abounce.o:/builddir/build/BUILD/postfix-3.4.9/src/global/./mail_params.h:3987: first defined here ... collect2: error: ld returned 1 exit status make: *** [Makefile:206: libpostfix-global.so] Error 1 make: *** Waiting for unfinished jobs.... make: *** [Makefile:105: update] Error 1
Probably older versions of postfix fails as well (I haven't tried). This is caused by a change in GCC 10 from -fcommon to -fno-common [1]: GCC now defaults to -fno-common. As a result, global variable accesses are more efficient on various targets. In C, global variables with multiple tentative definitions now result in linker errors. With -fcommon such definitions are silently merged during linking. If compiling with -fcommon it builds OK thanks & regards Jaroslav [1] https://gcc.gnu.org/gcc-10/changes.html
