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authorc99pedant <62681854+c99pedant@users.noreply.github.com>2020-03-26 03:54:32 +0000
committerGitHub <noreply@github.com>2020-03-26 03:54:32 +0000
commit181039826ab5965f40ed7462a51e3ff5a7a76be1 (patch)
treed94688d14cd5795ab47b668261a93075c0f7b3dc /test/bg/large/w/max
parentff11ba5c4f866089b6457daa42b54b04615b156b (diff)
Quit curl cleanly even if libcurl is old.
Building feh 3.3 on CentOS 7 x86_64 warns `curl_quit_function` in `imlib.c` is unused: ``` cc -g -O2 -Wall -Wextra -pedantic -std=c11 -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700 -DHAVE_LIBCURL -DHAVE_VERSCMP -DHAVE_LIBXINERAMA -DHAVE_LIBEXIF -DPREFIX=\"/usr/local\" -DPACKAGE=\"feh\" -DVERSION=\"3.3\" -c -o imlib.o imlib.c imlib.c:545:12: warning: ‘curl_quit_function’ defined but not used [-Wunused-function] static int curl_quit_function(void *clientp, curl_off_t dltotal, curl_off_t dlnow, curl_off_t ultotal, curl_off_t ulnow) ^ ``` The `curl_quit_function` code was added in response to pull [#435](https://github.com/derf/feh/pull/435) In issue [#485](https://github.com/derf/feh/issues/485) a fellow CentOS 7 user had an error building feh because CentOS 7 is locked into an old version of libcurl. In the fix, a version guard was wrapped around the `curl_easy_setopt` call, but the rest of the code was unchanged. Since I don't want to maintain a local build of libcurl, I looked at the curl docs and noticed there is an older callback which serves the same purpose: https://curl.haxx.se/libcurl/c/CURLOPT_PROGRESSFUNCTION.html The difference between `PROGRESS` and `XFERINFO` is the callback's argument types, with `PROGRESS` using `double` and `XFERINFO` using `curl_off_t`: https://curl.haxx.se/libcurl/c/CURLOPT_XFERINFOFUNCTION.html The callback's return value logic and use of `CURLOPT_NOPROGRESS` is the same. For context, the latest libcurl RPM I'm getting from yum updates is `libcurl-7.29.0-54.el7_7.2.x86_64`. The "stable" versions of other distros may encounter similar issues. The CentOS 7 "End of Life" date is 2024-06-30 so you should hear the end of this by then, at least from us pesky CentOS users.
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