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authorLasse Collin <lasse.collin@tukaani.org>2023-09-24 16:32:32 +0300
committerLasse Collin <lasse.collin@tukaani.org>2023-09-24 16:32:32 +0300
commit7d73d1f0e08f96c4ab7aac91b958e37a3dadf07a (patch)
treedc91c8e1aace94ef4910b4b24885acbcba4a3427 /src
parentxz: Windows: Don't (de)compress to special files like "con" or "nul". (diff)
downloadxz-7d73d1f0e08f96c4ab7aac91b958e37a3dadf07a.tar.xz
sysdefs.h: Update the comment about __USE_MINGW_ANSI_STDIO.
Diffstat (limited to 'src')
-rw-r--r--src/common/sysdefs.h10
1 files changed, 9 insertions, 1 deletions
diff --git a/src/common/sysdefs.h b/src/common/sysdefs.h
index 07502dc9..3e1ff1eb 100644
--- a/src/common/sysdefs.h
+++ b/src/common/sysdefs.h
@@ -24,7 +24,15 @@
# include <config.h>
#endif
-// Get standard-compliant stdio functions under MinGW and MinGW-w64.
+// This #define ensures that C99 and POSIX compliant stdio functions are
+// available with MinGW-w64 (both 32-bit and 64-bit). Modern MinGW-w64 adds
+// this automatically, for example, when the compiler is in C99 (or later)
+// mode when building against msvcrt.dll. It still doesn't hurt to be explicit
+// that we always want this and #define this unconditionally.
+//
+// With Universal CRT (UCRT) this is less important because UCRT contains
+// C99-compatible stdio functions. It's still nice to #define this as UCRT
+// doesn't support the POSIX thousand separator flag in printf (like "%'u").
#ifdef __MINGW32__
# define __USE_MINGW_ANSI_STDIO 1
#endif