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Code using atomics should link with -latomic #9055

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atsampson opened this issue Jun 27, 2022 · 0 comments
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Code using atomics should link with -latomic #9055

atsampson opened this issue Jun 27, 2022 · 0 comments
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@atsampson
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Building curl-7.84.0 for 64-bit RISC-V Linux using GCC 12.1.0 fails for me:

  CCLD     curl
ld: ../lib/.libs/libcurl.so: undefined reference to `__atomic_exchange_1'

This is because GCC 12 doesn't inline sub-word-sized atomic operations (although future versions may do), and the new code in easy_lock.h does an atomic exchange on a single-byte atomic_bool.

The proper fix would be to link with GCC's libatomic - maybe CURL_ATOMIC should check for this? Changing the type of curl_simple_lock to atomic_int also works as a workaround.
@bagder bagder added the build label Jun 27, 2022
bagder added a commit that referenced this issue Jun 28, 2022
@bagder
easy_lock: switch to using atomic_int instead of bool
897d72b 
To work with more compilers without requiring separate libs to
link. Like with gcc-12 for RISC-V on Linux.

Reported-by: Adam Sampson
Fixes #9055
@bagder bagder mentioned this issue Jun 28, 2022
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@bagder bagder closed this as completed in 50efb08 Jun 28, 2022
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easy_lock: switch to using atomic_int instead of bool curl/curl
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@bagder @atsampson