+ if env['msvc']:
+ env.Append(LEXFLAGS = [
+ # Force flex to use const keyword in prototypes, as relies on
+ # __cplusplus or __STDC__ macro to determine whether it's safe to
+ # use const keyword, but MSVC never defines __STDC__ unless we
+ # disable all MSVC extensions.
+ '-DYY_USE_CONST=',
+ ])
+ # Flex relies on __STDC_VERSION__>=199901L to decide when to include
+ # C99 inttypes.h. We always have inttypes.h available with MSVC
+ # (either the one bundled with MSVC 2013, or the one we bundle
+ # ourselves), but we can't just define __STDC_VERSION__ without
+ # breaking stuff, as MSVC doesn't fully support C99. There's also no
+ # way to premptively include stdint.
+ env.Append(CCFLAGS = ['-FIinttypes.h'])
+ if host_platform.system() == 'Windows':
+ # Prefer winflexbison binaries, as not only they are easier to install
+ # (no additional dependencies), but also better Windows support.
+ if check_prog(env, 'win_flex'):
+ env["LEX"] = 'win_flex'
+ env.Append(LEXFLAGS = [
+ # windows compatibility (uses <io.h> instead of <unistd.h> and
+ # _isatty, _fileno functions)
+ '--wincompat'
+ ])
+