scons: Define YY_USE_CONST on MSVC.
This prevents the MSVC from
warning C4090: 'function' : different 'const' qualifiers
when compiling flex generated lexers.
Reviewed-by: Brian Paul <brianp@vmware.com>
diff --git a/scons/gallium.py b/scons/gallium.py
index 2b11526..9924f1e 100755
--- a/scons/gallium.py
+++ b/scons/gallium.py
@@ -622,6 +622,14 @@
# Load tools
env.Tool('lex')
+ 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=',
+ ])
env.Tool('yacc')
if env['llvm']:
env.Tool('llvm')