[Pkg-openssl-devel] Bug#1138364: websocketpp: FTBFS with openssl 4.0

[Sebastian Andrzej Siewior]

Package: websocketpp
Version: 0.8.2+git20250909-2
Severity: normal
Tags: sid
control: affects -1 src:openssl
User: pkg-openssl-devel at lists.alioth.debian.org
Usertags: openssl-4.0

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

| [ 24%] Building CXX object examples/print_client_tls/CMakeFiles/print_client_tls.dir/print_client_tls.cpp.o
| cd /build/reproducible-path/websocketpp-0.8.2+git20250909/obj-x86_64-linux-gnu/examples/print_client_tls && /usr/bin/c++ -DBOOST_ATOMIC_DYN_LINK -DBOOST_ATOMIC_NO_LIB -DBOOST_CHRONO_DYN_LINK -DBOOST_CHRONO_NO_LIB -DBOOST_CONTAINER_DYN_LINK -DBOOST_CONTAINER_NO_LIB -DBOOST_DATE_TIME_DYN_LINK -DBOOST_DATE_TIME_NO_LIB -DBOOST_RANDOM_DYN_LINK -DBOOST_RANDOM_NO_LIB -DBOOST_TEST_DYN_LINK -DBOOST_THREAD_DYN_LINK -DBOOST_THREAD_NO_LIB -DBOOST_UNIT_TEST_FRAMEWORK_DYN_LINK -DBOOST_UNIT_TEST_FRAMEWORK_NO_LIB -DNDEBUG -D_WEBSOCKETPP_CPP11_STL_ -I/build/reproducible-path/websocketpp-0.8.2+git20250909/examples/print_client_tls -I/build/reproducible-path/websocketpp-0.8.2+git20250909 -I/build/reproducible-path/websocketpp-0.8.2+git20250909/websocketpp -g -O2 -ffile-prefix-map=/build/reproducible-path/websocketpp-0.8.2+git20250909=. -fstack-protector-strong -fstack-clash-protection -Wformat -Werror=format-security -fcf-protection -Wdate-time -D_FORTIFY_SOURCE=2 -std=c++0x   -Wall -Wcast-align -MD -MT examples/print_client_tls/CMakeFiles/print_client_tls.dir/print_client_tls.cpp.o -MF CMakeFiles/print_client_tls.dir/print_client_tls.cpp.o.d -o CMakeFiles/print_client_tls.dir/print_client_tls.cpp.o -c /build/reproducible-path/websocketpp-0.8.2+git20250909/examples/print_client_tls/print_client_tls.cpp
| /build/reproducible-path/websocketpp-0.8.2+git20250909/examples/print_client_tls/print_client_tls.cpp: In function ‘bool verify_subject_alternative_name(const char*, X509*)’:
| /build/reproducible-path/websocketpp-0.8.2+git20250909/examples/print_client_tls/print_client_tls.cpp:67:57: warning: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
|    67 |         if (ASN1_STRING_length(current_name->d.dNSName) != strlen(dns_name)) {
|       |             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
| /build/reproducible-path/websocketpp-0.8.2+git20250909/examples/print_client_tls/print_client_tls.cpp: In function ‘bool verify_common_name(const char*, X509*)’:
| /build/reproducible-path/websocketpp-0.8.2+git20250909/examples/print_client_tls/print_client_tls.cpp:87:62: error: invalid conversion from ‘const X509_NAME_ENTRY*’ {aka ‘const X509_name_entry_st*’} to ‘X509_NAME_ENTRY*’ {aka ‘X509_name_entry_st*’} [-fpermissive]
|    87 |     X509_NAME_ENTRY * common_name_entry = X509_NAME_get_entry(X509_get_subject_name(cert), common_name_loc);
|       |                                           ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|       |                                                              |
|       |                                                              const X509_NAME_ENTRY* {aka const X509_name_entry_st*}
| /build/reproducible-path/websocketpp-0.8.2+git20250909/examples/print_client_tls/print_client_tls.cpp:93:62: error: invalid conversion from ‘const ASN1_STRING*’ {aka ‘const asn1_string_st*’} to ‘ASN1_STRING*’ {aka ‘asn1_string_st*’} [-fpermissive]
|    93 |     ASN1_STRING * common_name_asn1 = X509_NAME_ENTRY_get_data(common_name_entry);
|       |                                      ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
|       |                                                              |
|       |                                                              const ASN1_STRING* {aka const asn1_string_st*}
| /build/reproducible-path/websocketpp-0.8.2+git20250909/examples/print_client_tls/print_client_tls.cpp:101:46: warning: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
|   101 |     if (ASN1_STRING_length(common_name_asn1) != strlen(common_name_str)) {
|       |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
| make[3]: *** [examples/print_client_tls/CMakeFiles/print_client_tls.dir/build.make:82: examples/print_client_tls/CMakeFiles/print_client_tls.dir/print_client_tls.cpp.o] Error 1


Full buildlog
 	https://breakpoint.cc/openssl-rebuild/logs-4/attempted/websocketpp_0.8.2+git20250909-2_amd64-2026-04-19T09:54:50Z

Sebastian