[Buildroot] [git commit branch/2020.02.x] package/fakeroot: fix glibc detection on patch for new wrappers

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=5904d13b90ac3e50ed801587fdf717550daa62e9
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2020.02.x

Commit f45925a951318e9e53bead80b363e004301adc6f add the patch:

0003-libfakeroot.c-add-wrappers-for-new-glibc-2.33-symbol.patch

which allowed fakeroot to be compiled with GLIBC 2.33 or above.
However, this introduce a bug for building with a non-GLIBC based
toolchain as a GLIBC macro - __GLIBC_PREREQ - is used on the same line
as the detection of GLIBC.

Fix this by backporting the fix to this incorrect macro from upstream
commit:

https://salsa.debian.org/clint/fakeroot/-/commit/8090dffdad8fda86dccd47ce7a7db8840bdf7d7b

CC: Peter Korsgaard <peter at korsgaard.com>
Signed-off-by: Ryan Barnett <ryanbarnett3 at gmail.com>
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 .../0008-fix-build-regression-on-macOS.patch       | 63 ++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/package/fakeroot/0008-fix-build-regression-on-macOS.patch b/package/fakeroot/0008-fix-build-regression-on-macOS.patch
new file mode 100644
index 0000000000..480e2b3d6d
--- /dev/null
+++ b/package/fakeroot/0008-fix-build-regression-on-macOS.patch
@@ -0,0 +1,63 @@
+From dc910b81378b5fb8b4e851d5deb9755e6969dad5 Mon Sep 17 00:00:00 2001
+From: Ilya Lipnitskiy <ilya.lipnitskiy at gmail.com>
+Date: Mon, 15 Feb 2021 11:07:56 -0800
+Subject: [PATCH] fix build regression on macOS
+
+Signed-off-by: Felix Fietkau <nbd at nbd.name>
+Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy at gmail.com>
+[Ryan: backported from 8090dffdad8fda86dccd47ce7a7db8840bdf7d7b]
+Signed-off-by: Ryan Barnett <ryanbarnett3 at gmail.com>
+---
+ configure.ac  | 6 ++++++
+ libfakeroot.c | 4 +++-
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index 71f90ff..0ad1da0 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -181,6 +181,9 @@ AC_MSG_CHECKING([for type of arg of __xmknod])
+        #include <fcntl.h>
+        #include <unistd.h>
+   ]], [[
++#ifndef __GLIBC__
++#error no extra *
++#endif
+        int __xmknod  ( int ver,
+                        const char *pathname ,
+                        mode_t  mode ,  dev_t *dev);
+@@ -207,6 +210,9 @@ AC_MSG_CHECKING([for type of arg of __xmknodat])
+        #include <fcntl.h>
+        #include <unistd.h>
+   ]], [[
++#ifndef __GLIBC__
++#error no extra *
++#endif
+        int __xmknodat  ( int ver,
+                          int dirfd,
+                          const char *pathname ,
+diff --git a/libfakeroot.c b/libfakeroot.c
+index 3eedd99..6e49618 100644
+--- a/libfakeroot.c
++++ b/libfakeroot.c
+@@ -1351,7 +1351,8 @@ int renameat(int olddir_fd, const char *oldpath,
+ #endif /* HAVE_FSTATAT */
+ 
+ 
+-#if defined(__GLIBC__) && __GLIBC_PREREQ(2,33)
++#if defined(__GLIBC__)
++#if __GLIBC_PREREQ(2,33)
+ /* Glibc 2.33 exports symbols for these functions in the shared lib */
+   int lstat(const char *file_name, struct stat *statbuf) {
+      return WRAP_LSTAT LSTAT_ARG(_STAT_VER, file_name, statbuf);
+@@ -1396,6 +1397,7 @@ int renameat(int olddir_fd, const char *oldpath,
+        return WRAP_MKNODAT MKNODAT_ARG(_STAT_VER, dir_fd, pathname, mode, &dev);
+     }
+   #endif
++#endif /* __GLIBC__ */
+ #endif /* GLIBC_PREREQ */
+ 
+ 
+-- 
+2.25.1
+