build: fix -Wconversion/-Wsign-conversion warnings
#12557
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vszakats
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-Wconversion warning
The hope is that this fixes the FD_SET() type misalignment, that
is present in MSYS but not in Cygwin builds:
```
../../../docs/examples/sendrecv.c:47:3: warning: conversion to 'long unsigned int' from 'curl_socket_t' {aka 'int'} may change the sign of the result [-Wsign-conversion]
47 | FD_SET(sockfd, &errfd); /* always check for error */
| ^~~~~~
```
Ref: https://ci.appveyor.com/project/curlorg/curl/builds/48794906/job/54616tw3d74xrf6o?fullLog=true#L3031
This has been fixed in Cygwin in mid-2020:
https://cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=5717262b8ecfed0f7fab63e2c09c78991e36f9dd
vszakats
changed the title
-Wconversion warning-Wconversion/-Wsign-conversion warnings
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Fix remaining warnings in examples and tests which are not suppressed
by the pragma in
lib/curl_setup.h.Silence a toolchain issue causing warnings in
FD_SET()calls witholder Cygwin/MSYS2 builds. Likely fixed on 2020-08-03 by:
https://cygwin.com/git/?p=newlib-cygwin.git;a=commitdiff;h=5717262b8ecfed0f7fab63e2c09c78991e36f9dd
Follow-up to 2dbe75b #12492
Closes #12557
Red CI after merging to master: https://ci.appveyor.com/project/curlorg/curl/builds/48791215
Edit: The last CI run for the PR skipped the AppVeyor tests, which were not clean yet apparently.