win32/build.py: add -D_FORTIFY_SOURCE=0

This fixes the Windows build. Linking failed because some packages (e.g. libFLAC) default to enabling `_FORTIFY_SOURCE`, which is broken in recent mingw versions (https://github.com/msys2/MINGW-packages/issues/5803).

win32/build.py: add -D_FORTIFY_SOURCE=0
3b51c53e · Max Kellermann · 0aa0ffb6 · 3b51c53e
Commit 3b51c53e authored Sep 04, 2020 by Max Kellermann
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build.py win32/build.py +5 -0

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--- a/win32/build.py
+++ b/win32/build.py
@@ -66,6 +66,11 @@ class CrossGccToolchain:
                       ' -static-libstdc++ -static-libgcc'
        self.libs = ''

+        # Explicitly disable _FORTIFY_SOURCE because it is broken with
+        # mingw.  This prevents some libraries such as libFLAC to
+        # enable it.
+        self.cppflags += ' -D_FORTIFY_SOURCE=0'
+
        self.is_arm = arch.startswith('arm')
        self.is_armv7 = self.is_arm and 'armv7' in self.cflags
        self.is_aarch64 = arch == 'aarch64'