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From: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
To: submit@bugs.debian.org
Subject: libcoap3: FTBFS with openssl 4.0
Message-ID: <20260530155016.6qpg51T2@breakpoint.cc>
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X-Debbugs-CC: pkg-openssl-devel@alioth-lists.debian.net
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Package: libcoap3
Version: 4.3.5-2
Severity: normal
Tags: sid
control: affects -1 src:openssl
User: pkg-openssl-devel@lists.alioth.debian.org
Usertags: openssl-4.0

OpenSSL 4.0 is in experimental. This package fails to build against it:

| libtool: link: x86_64-linux-gnu-gcc -I../include -I../../../../include -pedantic -Wall -Wcast-qual -Wextra -Wformat-security -Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wpointer-arith -Wshadow -Wstrict-prototypes -Wswitch-default -Wswitch-enum -Wunused -Wwrite-strings -Wlogical-op -Wunused-result -std=c99 -g -O2 -Werror=implicit-function-declaration -ffile-prefix-map=/build/reproducible-path/libcoap3-4.3.5=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -fdiagnostics-color -D_GNU_SOURCE -Wl,-z -Wl,relro -Wl,-z -Wl,now -o .libs/coap-client-openssl coap-client.o  -lssl -lcrypto ../.libs/libcoap-3-openssl.so
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_init'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_ctrl_cmd'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_ctrl_cmd_string'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_load_dynamic'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_free'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_finish'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_by_id'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_set_default'
| /usr/bin/x86_64-linux-gnu-ld.bfd: ../.libs/libcoap-3-openssl.so: undefined reference to `ENGINE_load_private_key'
| collect2: error: ld returned 1 exit status
| make[4]: *** [Makefile:596: coap-client-openssl] Error 1

Full buildlog
	https://breakpoint.cc/openssl-rebuild/logs-4/attempted/libcoap3_4.3.5-2_amd64-2026-04-19T07:47:12Z
 
Sebastian
]