openssl: [TEMP. FIX] undefined reference to `pthread_atfork'

Hi. I’m trying to build Nginx with this script, but I get this error.

objs/addon/src/ngx_http_brotli_filter_module.o \
objs/ngx_modules.o \
-ldl -lpthread -lpthread -lcrypt -lm ../pcre-8.41/.libs/libpcre.a ../openssl/.openssl/lib/libssl.a ../openssl/.openssl/lib/libcrypto.a -ldl ../libatomic_ops-7.6.0/src/libatomic_ops.a \
-Wl,-E
../openssl/.openssl/lib/libcrypto.a(threads_pthread.o): In function `openssl_init_fork_handlers':
threads_pthread.c:(.text+0x1ba): undefined reference to `pthread_atfork'
collect2: error: ld returned 1 exit status
make[1]: *** [objs/Makefile:309: objs/nginx] Error 1

I was able to build two weeks ago, so this issue must be new.

[EDIT] See the temporary fix.

About this issue

Original URL
State: closed
Created 7 years ago
Comments: 27 (14 by maintainers)

Commits related to this issue

Add anything specifying a threads library to ex_libs Even -pthread gets treated that way. The reason to do this is so it ends up in 'Libs.private' in libcrypto.pc. Fixes #3884 — committed to levitte/openssl by levitte 6 years ago
Add anything specifying a threads library to ex_libs Even -pthread gets treated that way. The reason to do this is so it ends up in 'Libs.private' in libcrypto.pc. Fixes #3884 — committed to levitte/openssl by levitte 6 years ago
Add anything specifying a threads library to ex_libs Even -pthread gets treated that way. The reason to do this is so it ends up in 'Libs.private' in libcrypto.pc. Fixes #3884 Reviewed-by: Bernd E... — committed to openssl/openssl by levitte 6 years ago

Most upvoted comments

So finally, It seems that the Nginx configuration file is quite odd. So the the temporary solution for now is a hack. After running the ./configure, in obj/Makefile, you should remove the first -lpthread and move the second to the end of the line, right before \. Since the github repo. of Nginx is just a mirror, I can’t submit an issue about this.

Thanks to all of you who supported me through this whole issue.

+15

concatime on Jan 20, 2018

You should use “-pthread”, not “-lpthread”.

-lpthread will probably also work if you move it to the end of the libraries.

For some reason you’re also using a static version of all the libraries. I suggest you use shared versions instead if you can. Your OS should already provide shared versions of those libraries.

kroeckx on Jul 8, 2017

nginx 1.13.11 fix

https://github.com/nginx/nginx/commit/90ca1071b77b0fbb4373ae052b1242023295513f

khs1994 on Apr 4, 2018

And i add -pthread to --with-cc-opt to build again, but get a same error:

...
-Wl,-z,relro -Wl,-z,now -pie -ldl -lpthread -lcrypt -lpcre ../openssl-master/.openssl/lib/libssl.a ../openssl-master/.openssl/lib/libcrypto.a -ldl -lz \
-Wl,-E
../openssl-master/.openssl/lib/libcrypto.a(threads_pthread.o)：In function ‘fork_once_func’：
threads_pthread.c:(.text+0x16)：undefined reference to 'pthread_atfork'

you should use “–with-ld-opt=-pthread”

ccy234 on Apr 21, 2021

For those who want a scripted temporary solution:

gawk -i inplace \
  '/pthread/ { sub(/-lpthread /, ""); sub(/-lpthread /, ""); sub(/\\/, "-lpthread \\"); print } ! /pthread/ { print }' \
  "objs/Makefile"

dsamarin on Oct 1, 2017

It looks to me like this is an order problem:

objs/addon/src/ngx_http_brotli_filter_module.o \
objs/ngx_modules.o \
-ldl -lpthread -lpthread -lcrypt -lm ../pcre-8.41/.libs/libpcre.a ../openssl/.openssl/lib/libssl.a ../openssl/.openssl/lib/libcrypto.a -ldl ../libatomic_ops-7.6.0/src/libatomic_ops.a \
-Wl,-E

Shouldn’t -lpthread appear last to make sure the symbol references in libcrypto.a get properly resolved?

levitte on Jul 8, 2017