[openwrt/openwrt] tools/fakeroot: fix check for whether to wrap time64 functions

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/f864b83b1dffaf4e4fcba4abf0142146975af4a9

commit f864b83b1dffaf4e4fcba4abf0142146975af4a9
Author: Michael Pratt <mcpratt at pm.me>
AuthorDate: Sat Jun 22 00:58:39 2024 -0400

    tools/fakeroot: fix check for whether to wrap time64 functions
    
    Fakeroot uses an egrep configure check to look for the string "time64"
    within a preprocessed include of the sys/stat.h header
    in order to decide whether or not to create declarations
    and internal functions used for wrapping the native functions
    stat64_time64 fstat64_time64 lstat64_time64 and fstatat64_time64.
    
    On specific older versions of glibc these functions are not included,
    but there are some references to "time64" unrelated to functions,
    like aliasing the time64_t typedef to the standard time_t typedef
    when the size of a word is 64 bits or defining it if not.
    
    In this case, a grep for "stat64"
    of the preprocessed sys/stat.h header matches nothing,
    however, the grep for "time64" in the configure check
    of the preprocessed sys/stat.h header matches a line
    that has nothing to do with the functions
    that will be wrapped as a result of successful matching.
    
      __extension__ typedef __int64_t __time64_t;
    
    This causes the attempt to wrap the functions to occur,
    which fails due to some of the corresponding macros being empty
    since the native declarations they are based on do not exist,
    causing a common error claiming that a part of the syntax is missing.
    
      error: expected '=', ',', ';', 'asm' or '__attribute__' before ...
    
    Fix this by making the testing regular expression more complex
    in order to match actual function names ending in "_time64"
    with or without a set of preceding underscores, but none after.
    
    Signed-off-by: Michael Pratt <mcpratt at pm.me>
    Link: https://github.com/openwrt/openwrt/pull/15773
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 tools/fakeroot/patches/300-time64-hack.patch | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/fakeroot/patches/300-time64-hack.patch b/tools/fakeroot/patches/300-time64-hack.patch
new file mode 100644
index 0000000000..540724fb5a
--- /dev/null
+++ b/tools/fakeroot/patches/300-time64-hack.patch
@@ -0,0 +1,11 @@
+--- a/configure.ac
++++ b/configure.ac
+@@ -386,7 +386,7 @@ dnl  Digital Unix: stat
+ time64_hack=no
+ AH_TEMPLATE([TIME64_HACK], [time64 shuffle])
+ AC_MSG_CHECKING([if we need to cope with time64])
+-AC_EGREP_CPP([time64],[
++AC_EGREP_CPP([_*[a-z0-9]+_time64[^_]],[
+ #include <bits/wordsize.h>
+ #if __WORDSIZE == 32
+ #define __USE_TIME_BITS64 1