Build fails on Ubuntu 18.04

[MushyMiddle]

Hi. I tried to build on Ubuntu 18.04, and the build fails with the following. Build was clean on 16.04 (no warnings or errors)...

gcc -DHAVE_CONFIG_H -I. -I/usr/include/libgsf-1 -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/libxml2 -I/usr/include/x86_64-linux-gnu -g -O2 -MT osslsigncode.o -MD -MP -MF .deps/osslsigncode.Tpo -c -o osslsigncode.o osslsigncode.c
osslsigncode.c: In function ‘createOpus’:
osslsigncode.c:453:36: warning: implicit declaration of function ‘M_ASN1_IA5STRING_new’; did you mean ‘ASN1_IA5STRING_new’? [-Wimplicit-function-declaration]
info->programName->value.ascii = M_ASN1_IA5STRING_new();
^~~~~~~~~~~~~~~~~~~~
ASN1_IA5STRING_new
osslsigncode.c:453:34: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
info->programName->value.ascii = M_ASN1_IA5STRING_new();
^
osslsigncode.c:461:29: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
info->moreInfo->value.url = M_ASN1_IA5STRING_new();
^
osslsigncode.c: In function ‘add_timestamp’:
osslsigncode.c:612:14: error: storage size of ‘mdctx’ isn’t known
EVP_MD_CTX mdctx;
^~~~~
osslsigncode.c:624:3: warning: implicit declaration of function ‘M_ASN1_OCTET_STRING_set’; did you mean ‘ASN1_OCTET_STRING_set’? [-Wimplicit-function-declaration]
M_ASN1_OCTET_STRING_set(req->messageImprint->digest, mdbuf, EVP_MD_size(md));
^~~~~~~~~~~~~~~~~~~~~~~
ASN1_OCTET_STRING_set
osslsigncode.c: In function ‘cleanup_lib_state’:
osslsigncode.c:819:2: warning: ‘ERR_remove_thread_state’ is deprecated [-Wdeprecated-declarations]
ERR_remove_thread_state(NULL);
^~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/openssl/crypto.h:32:0,
from /usr/include/openssl/bio.h:20,
from /usr/include/openssl/err.h:21,
from osslsigncode.c:106:
/usr/include/openssl/err.h:247:1: note: declared here
DEPRECATEDIN_1_1_0(void ERR_remove_thread_state(void *))
^
osslsigncode.c: At top level:
osslsigncode.c:927:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
DECLARE_STACK_OF(ASN1_OCTET_STRING)
^~~~~~~~~~~~~~~~
osslsigncode.c: In function ‘DECLARE_STACK_OF’:
osslsigncode.c:936:1: error: expected declaration specifiers before ‘DECLARE_STACK_OF’
DECLARE_STACK_OF(SpcAttributeTypeAndOptionalValue)
^~~~~~~~~~~~~~~~
osslsigncode.c:1002:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘attribute’ before ‘{’ token
{
^
...

[siennathesane]

Yeah, I'm hitting this issue, too. I think it has to do with the version of GCC you use.