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Bug #81130 implicit declaration of function 'fdatasync' is invalid in C99
Submitted: 2021-06-12 14:37 UTC Modified: 2021-06-12 14:42 UTC
From: php-bugs-2021 at ryandesign dot com Assigned: krakjoe (profile)
Status: Closed Package: Compile Failure
PHP Version: 8.1.0alpha1 OS: macOS 10.13.6
Private report: No CVE-ID: None
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 [2021-06-12 14:37 UTC] php-bugs-2021 at ryandesign dot com 
Description:
------------
Hi, I'm the maintainer of php in MacPorts, trying out php 8.1.0alpha1, and it does not compile for me on macOS 10.13.6 with Apple LLVM version 9.1.0 (clang-902.0.39.2) from Xcode 9.4.1.

./configure output includes:


checking for fdatasync... yes


However the build fails with:


main/streams/plain_wrapper.c:559:11: error: implicit declaration of function 'fdatasync' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
                        return fdatasync(fd);
                               ^
main/streams/plain_wrapper.c:559:11: warning: this function declaration is not a prototype [-Wstrict-prototypes]
1 warning and 1 error generated.
make: *** [main/streams/plain_wrapper.lo] Error 1
make: *** Waiting for unfinished jobs....


n.b. I am using CFLAGS=-Werror=implicit-function-declaration to mimic the default behavior of Xcode 12 and later.

I can't find a macOS manpage for fdatasync. Searching around, some people think macOS does have fdatasync (it is mentioned in https://opensource.apple.com/source/xnu/xnu-7195.81.3/bsd/vfs/vfs_syscalls.c.auto.html for example) but just doesn't have a prototype of it in any system header, which would be a bit odd. Others suggest not trying to use fdatasync on macOS. I'm not sure what to recommend.

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 [2021-06-12 14:42 UTC] krakjoe@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: krakjoe
 [2021-06-12 14:42 UTC] krakjoe@php.net 
The fix for this bug has been committed.
If you are still experiencing this bug, try to check out latest source from https://github.com/php/php-src and re-test.
Thank you for the report, and for helping us make PHP better.

This was fixed in e69729f2ba02ddc26c70b4bd88ef86c0a2277bdc

This just missed alpha 1, will be included in alpha 2 and is in master.
 [2021-06-13 10:15 UTC] php-bugs-2021 at ryandesign dot com 
Confirmed! Thank you.
 
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