Use -filelist with macOS linker

macOS's linker can take a -filelist argument, in place of taking the
list of object files to link on the command line. This is a more limited
version of "response files" as used elsewhere in the code base, and by
using it we make it far less likely that a linker invocation will hit
ARG_MAX.

A standard LibreOffice build probably won't hit ARG_MAX on macOS just
yet, but it's not far off - some LDFLAGS are enough to tip it over the
edge, which is what prompted me to fix the issue. If not fixed, a few
more object files will probably break LibreOffice builds on macOS! An
example of another large program that has encountered this issue is
Thunderbird, which implemented the same fix[1].

The changes I've made to use -filelist are adapted from the code
elsewhere in gbuild that creates response files, but this is slightly
different because -filelist files are a bit different - they can only
contain object files, as opposed to arbitrary linker arguments, and
arguments are separated by newlines rather than spaces.

[1]: https://bugzilla.mozilla.org/show_bug.cgi?id=837618

Change-Id: I01b9126aad95056c3dc82f941dea4fd43f95d0f2
Reviewed-on: https://gerrit.libreoffice.org/64010
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

0 files changed, 0 insertions, 0 deletions