macOS only? NetBSD? FreeBSD? OpenBSD?
If you tested on FreeBSD, please file a bug at https://bugs.freebsd.org/bugzilla/enter_bug.cgi?product=Base...
I'm not a project member but I'm a user of the system so it's in my interest that issues like this are resolved.
Please let me know whether or not you file a bug so that if you do I don't duplicate bug reports and if you don't I can do some benchmarking myself.
rm -rf /tmp/glob
mkdir /tmp/glob
cd /tmp/glob
touch $(perl -e 'print "a"x100')
#include <stdio.h>
#include <glob.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <dirent.h>
#include <time.h>
int
main(void)
{
glob_t g;
char pattern[1000], *p;
struct timespec t, t2;
double dt;
int i, j, k;
chdir("/tmp/glob");
setlinebuf(stdout);
int mul = 1000;
for(i = 0; i < 100; i++) {
p = pattern;
for (k = 0; k < i; k++) {
*p++ = 'a';
*p++ = '*';
}
*p++ = 'b';
*p = '\0';
printf("# %d %s\n", i, pattern);
clock_gettime(CLOCK_REALTIME, &t);
for (j = 0; j < mul; j++) {
memset(&g, 0, sizeof g);
if(glob(pattern, 0, 0, &g) != GLOB_NOMATCH) {
fprintf(stderr, "error: found matches\n");
exit(2);
}
globfree(&g);
}
clock_gettime(CLOCK_REALTIME, &t2);
t2.tv_sec -= t.tv_sec;
t2.tv_nsec -= t.tv_nsec;
dt = t2.tv_sec + (double)t2.tv_nsec/1e9;
printf("%d %.9f\n", i, dt/mul);
fflush(stdout);
if(dt/mul >= 0.0001)
mul = 1;
if(i >= 8 && dt/mul >= 10)
break;
}
}
# 0 b
0 0.000000661
# 1 a*b
1 0.000005204
# 2 a*a*b
2 0.000036157
# 3 a*a*a*b
3 0.001124974
# 4 a*a*a*a*b
4 0.046123932
# 5 a*a*a*a*a*b
5 0.577535034
# 6 a*a*a*a*a*a*b
6 8.666314375
# 7 a*a*a*a*a*a*a*b
7 119.796626615
Please file a bug.