meson: Add support for using win_flex and win_bison on windows

Acked-by: Kristian H. Kristensen <hoegsberg@google.com>

diff --git a/meson.build b/meson.build
index 10b9c9e9b191e32cd5c584612311f012d2d4af8e..b823dd8ecec6139c0e19baf2adf5ad6692b811bc 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -1438,8 +1438,31 @@ endif
 
 # pthread stubs. Lets not and say we didn't
 
-prog_bison = find_program('bison', required : with_any_opengl)
-prog_flex = find_program('flex', required : with_any_opengl)
+if host_machine.system() == 'windows'
+  # Prefer the winflexbison versions, they're much easier to install and have
+  # better windows support.
+
+  prog_flex = find_program('win_flex', required : false)
+  if prog_flex.found()
+    # windows compatibility (uses <io.h> instead of <unistd.h> and _isatty,
+    # _fileno functions)
+    prog_flex = [prog_flex, '--wincompat']
+  else
+    prog_flex = [find_program('lex', 'flex', required : with_any_opengl)]
+  endif
+  # 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.
+  prog_flex += '-DYY_USE_CONST='
+
+  prog_bison = find_program('win_bison', required : false)
+  if not prog_bison.found()
+    prog_bison = find_program('yacc', 'bison', required : with_any_opengl)
+  endif
+else
+  prog_bison = find_program('bison', required : with_any_opengl)
+  prog_flex = find_program('flex', required : with_any_opengl)
+endif
 
 dep_selinux = null_dep
 if get_option('selinux')