Re: CURLOPT_WRITEFUNCTION issues - warning: curl_easy_setopt expects a curl_write_callback argument

[Timothe Litt via curl-library]

It enables link-time optimizations.  The compiler/linker can see further into to the source, and detect errors not seen at the module level.

Timothe Litt
ACM Distinguished Engineer
--------------------------
This communication may not represent the ACM or my employer's views,
if any, on the matters discussed.

On 21-Jan-22 05:11, Gavin Henry via curl-library wrote:

It's saying that your callback routine must be declared/typedefed as a "curl_write_callback".

  -O2 -flto=auto -ffat-lto-objects
-fexceptions -g -grecord-gcc-switches -pipe -Wall
-Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1
  -m64  -mtune=generic -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection  -Wl,-z,relro -Wl,--as-needed
  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1

So RH is adding about, but it's actually only this that is triggering the error:

-flto=auto

Going to read up on what that does which causes:

error: call to ‘_curl_easy_setopt_err_write_callback’ declared with
attribute warning: curl_easy_setopt expects a curl_write_callback
argument for this option [-Werror=attribute-warning]
    60 |         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,
       |         ^
lto1: all warnings being treated as errors


Thanks.

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