tup 0.7.1: conflicting types for 'readlinkat'

[baldur.kristinsson@…]

Tup 0.7.1 fails to install on OS X 10.10.3, Xcode version 6.3.2. It seems that readlinkat() is defined twice with slightly differing return types.

Here are the relevant lines from the build log:

:info:build In file included from ../src/tup/colors.c:25:
:info:build In file included from /usr/include/unistd.h:72:
:info:build /usr/include/sys/unistd.h:206:9: error: conflicting types for 'readlinkat'
:info:build ssize_t readlinkat(int, const char *, char *, size_t)   __OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0);
:info:build         ^
:info:build ./../src/compat/macosx.h:36:5: note: previous declaration is here
:info:build int readlinkat(int dirfd, const char *pathname, char *buf, size_t bufsiz);
:info:build     ^
:info:build 1 error generated.
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_tup/tup/work/tup-0.7.1" && ./build.sh all 
:info:build Exit code: 1
:error:build org.macports.build for port tup returned: command execution failed
:debug:build Error code: CHILDSTATUS 9781 1
:debug:build Backtrace: command execution failed
    while executing
"system -nice 0 $fullcmdstring"
    ("eval" body line 1)
    invoked from within
"eval system $notty $nice \$fullcmdstring"
    invoked from within
"command_exec build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"portbuild::build_main org.macports.build"
    ("eval" body line 1)
    invoked from within
"eval $procedure $targetname"

[ryandesign (Ryan Carsten Schmidt)]

​Upstream fixed this but hasn't released a new version since then. We can probably backport it.

[ryandesign (Ryan Carsten Schmidt)]

r136753