From ca2c6c4a0a90ed467af9c4c73b918dd4bf720f2a Mon Sep 17 00:00:00 2001
From: Stefan Hundhammer <Stefan.Hundhammer@gmx.de>
Date: Wed, 9 Feb 2022 11:05:31 +0100
Subject: [PATCH] Fixed GitHub issue #187: ALLPERMS not defined in libc-musl

---
 src/BrokenLibc.h   | 45 +++++++++++++++++++++++++++++++++++++++++++++
 src/FileInfo.cpp   |  1 +
 src/FormatUtil.cpp |  1 +
 src/src.pro        |  3 ++-
 4 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 src/BrokenLibc.h

diff --git a/src/BrokenLibc.h b/src/BrokenLibc.h
new file mode 100644
index 00000000..8bdf2a84
--- /dev/null
+++ b/src/BrokenLibc.h
@@ -0,0 +1,45 @@
+/*
+ *   File name: BrokenLibc.h
+ *   Summary:	Substitutes for common system-level defines
+ *   License:	GPL V2 - See file LICENSE for details.
+ *
+ *   Author:	Stefan Hundhammer <Stefan.Hundhammer@gmx.de>
+ */
+
+#ifndef BrokenLibc_h
+#define BrokenLibc_h
+
+// This contains common #defines that are present on modern systems, but
+// sometimes not on systems that insist to exchange known working subsystems
+// such as glibc with their own version, commonly because of the "not invented
+// here" syndrome.
+
+
+// Make sure the original defines are available regardless of include order
+
+#include <sys/stat.h>   // ALLPERMS
+
+
+#ifndef ALLPERMS
+#  define ALLPERMS 07777
+
+// Uncomment for debugging:
+// #  warning "Using ALLPERMS replacement"
+
+// Not available in musl-libc used on Gentoo:
+//
+//   https://github.com/shundhammer/qdirstat/issues/187
+//
+// Original from Linux / glibc /usr/include/x86_64-linux-gnu/sys/stat.h :
+//
+//   #define ALLPERMS (S_ISUID|S_ISGID|S_ISVTX|S_IRWXU|S_IRWXG|S_IRWXO)/* 07777 */
+//
+// But that might induce more complaints because any of S_IRWXU, S_IRWXG
+// etc. may also not be defined on such a system. So let's keep it simple.
+// If they also use a different bit pattern for those permissions, that's their
+// problem.
+#endif
+
+
+
+#endif  // BrokenLibc_h
diff --git a/src/FileInfo.cpp b/src/FileInfo.cpp
index 6be13a8d..d8195819 100644
--- a/src/FileInfo.cpp
+++ b/src/FileInfo.cpp
@@ -26,6 +26,7 @@
 #include "SysUtil.h"
 #include "Logger.h"
 #include "Exception.h"
+#include "BrokenLibc.h"     // ALLPERMS
 
 // Some filesystems (NTFS seems to be among them) may handle block fragments
 // well. Don't report files as "sparse" files if the block size is only a few
diff --git a/src/FormatUtil.cpp b/src/FormatUtil.cpp
index 6c755d79..43ca9ec4 100644
--- a/src/FormatUtil.cpp
+++ b/src/FormatUtil.cpp
@@ -11,6 +11,7 @@
 #include <QTextStream>
 
 #include "FormatUtil.h"
+#include "BrokenLibc.h"     // ALLPERMS
 
 using namespace QDirStat;
 
diff --git a/src/src.pro b/src/src.pro
index c9616462..50b51ca4 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -157,7 +157,8 @@ HEADERS	  =				\
 	    ActionManager.h		\
 	    AdaptiveTimer.h		\
 	    Attic.h			\
-	    BreadcrumbNavigator.h	\
+            BreadcrumbNavigator.h	\
+            BrokenLibc.h                \
 	    BucketsTableModel.h		\
 	    BusyPopup.h			\
 	    Cleanup.h			\