1e805ec618
Related to: <https://fedoraproject.org/wiki/Changes/PortingToModernC> <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>
39 lines
1.4 KiB
Diff
39 lines
1.4 KiB
Diff
Defining _XOPEN_SOURCE on its own hides definitions in other headers
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(which is already mentioned in upstream commit f49941a). One way to
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deal with this is to define _DEFAULT_SOURCE in addition to
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_XOPEN_SOURCE, which is what this commit implements.
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This is one way to avoid an implicit function declaration in the
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built-in mmap test that autoconf provides. It includes <unistd.h> and
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expects that to provide a declaration of getpagesize because the
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earlier check for HAVE_GETPAGESIZE succeeded. Without addressing the
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implicit function declaration, the outcome of this check will change
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with future compilers which no longer support them by default.
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Submitted upstream: <https://github.com/baszoetekouw/pinfo/pull/35>
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diff --git a/macros/wchar.m4 b/macros/wchar.m4
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index 2dc3d3a940f6c6fd..a7d6e967024df594 100644
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--- a/macros/wchar.m4
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+++ b/macros/wchar.m4
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@@ -78,7 +78,8 @@ AC_DEFUN([AC_CHECK_WCHAR],[
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then
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AC_COMPILE_IFELSE([
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AC_LANG_PROGRAM(
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- [[
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+ [[
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+ #define _DEFAULT_SOURCE
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#define _XOPEN_SOURCE 600
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#include <wchar.h>
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]],
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@@ -87,7 +88,7 @@ AC_DEFUN([AC_CHECK_WCHAR],[
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[
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dnl if found, set variables and print result
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have_wcwidth=true
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- wchar_flags="$wchar_flags -D_XOPEN_SOURCE=600"
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+ wchar_flags="$wchar_flags -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600"
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AC_MSG_RESULT([with -D_XOPEN_SOURCE=600])
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],
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[ ]
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