On 64-bit native Windows, PRIPTR_PREFIX comes out as "l", which produces
wrong output of intptr_t values through *printf. It should be "ll" instead.
2020-07-21 Bruno Haible <br...@clisp.org>
inttypes: Fix PRI*PTR and SCN*PTR on 64-bit native Windows.
* m4/inttypes.m4 (gl_INTTYPES_PRI_SCN): On 64-bit native Windows, make
sure PRIPTR_PREFIX is defined to "ll", not "l".
diff --git a/m4/inttypes.m4 b/m4/inttypes.m4
index 224d0cd..f9f5f86 100644
--- a/m4/inttypes.m4
+++ b/m4/inttypes.m4
@@ -1,4 +1,4 @@
-# inttypes.m4 serial 29
+# inttypes.m4 serial 30
dnl Copyright (C) 2006-2020 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -39,8 +39,17 @@ AC_DEFUN([gl_INTTYPES_PRI_SCN],
PRIPTR_PREFIX=
if test -n "$STDINT_H"; then
- dnl Using the gnulib <stdint.h>. It always defines intptr_t to 'long'.
- PRIPTR_PREFIX='"l"'
+ dnl Using the gnulib <stdint.h>. It defines intptr_t to 'long' or
+ dnl 'long long', depending on _WIN64.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_PROGRAM([[
+ #ifdef _WIN64
+ LLP64
+ #endif
+ ]]),
+ ],
+ [PRIPTR_PREFIX='"l"'],
+ [PRIPTR_PREFIX='"ll"'])
else
dnl Using the system's <stdint.h>.
for glpfx in '' l ll I64; do
