meson/test cases/common/227 very long commmand line/meson.build

project('very long command lines', 'c')

# Get the current system's commandline length limit.
if build_machine.system() == 'windows'
  # Various limits on windows:
  # cmd.exe: 8kb
  # CreateProcess: 32kb
  limit = 32767
  # NOTE: filename limit is 260 characters unless
  # 1. Python >= 3.6 is being used
  # 2. Windows 10 registry has been edited to enable long pathnaems
  # ninja backend uses absolute filenames, so we ensure they don't exceed 260.
elif build_machine.system() == 'cygwin'
  # cygwin-to-win32: see above
  # cygwin-to-cygwin: no limit?
  # Cygwin is slow, so only test it lightly here.
  limit = 8192
else
  # ninja passes whole line as a single argument, for which
  # the limit is 128k as of Linux 2.6.23.  See MAX_ARG_STRLEN.
  # BSD seems similar, see https://www.in-ulm.de/~mascheck/various/argmax
  limit = 131072
endif
# Now exceed that limit, but not so far that the test takes too long.
namelen = 260
nfiles = 50 + limit / namelen
message('Expected link commandline length is approximately ' + '@0@'.format((nfiles * (namelen+28))))

seq = run_command('name_gen.py', nfiles.to_string(), meson.build_root(), check: true).stdout().strip().split('\n')

sources = []
codegen = find_program('codegen.py')

i=0
foreach name : seq
  sources += custom_target('codegen' + i.to_string(),
                           command: [codegen, i.to_string(), '@OUTPUT@'],
                           output: name + '.c')
  i+=1
endforeach

shared_library('sharedlib', sources)
static_library('staticlib', sources)
executable('app', 'main.c', sources)

# Also test short commandlines to make sure that doesn't regress
shared_library('sharedlib0', sources[0])
static_library('staticlib0', sources[0])
executable('app0', 'main.c', sources[0])