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meson: tell flex that we support c99

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flexint.h uses stdint.h if the compiler claims to support C99. MSVC
doesn't support enough of C99 to enable this flag, but it supports
enough to keep flex happy.

Without this, we end up with *both* some flex-specific definitions as
well as our own definitions from mesa-headers, producing a slew of
compiler warnings.

Reviewed-by: Brian Paul <brianp@vmware.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4577>
This commit is contained in:
Erik Faye-Lund 2020-04-15 23:22:51 +02:00 committed by Marge Bot
parent 0752648a99
commit daeff19608
1 changed files with 1 additions and 1 deletions
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@ -1506,7 +1506,7 @@ if host_machine.system() == 'windows'
if prog_flex.found()
# windows compatibility (uses <io.h> instead of <unistd.h> and _isatty,
# _fileno functions)
prog_flex = [prog_flex, '--wincompat']
prog_flex = [prog_flex, '--wincompat', '-D__STDC_VERSION__=199901']
else
prog_flex = [find_program('lex', 'flex', required : with_any_opengl)]
endif