[RFC PATCH 2/2] grep: fallback to interpreter if JIT fails with pcre2

["Carlo Marcelo Arenas Belón" <carenas@gmail.com>]

starting with 10.23, and as a side effect of the work for bug1749[1] (grep
-P crash with seLinux), pcre2grep was modified to ignore any errors from
pcre2_jit_compile so the interpreter could be used as a fallback

[1] https://bugs.exim.org/show_bug.cgi?id=1749

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
---
 grep.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/grep.c b/grep.c
index 5ccc0421a1..c751c8cc74 100644
--- a/grep.c
+++ b/grep.c
@@ -530,8 +530,11 @@ static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt
 	pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
 	if (p->pcre2_jit_on == 1) {
 		jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
-		if (jitret)
-			die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
+		if (jitret) {
+			/* JIT failed so fallback to the interpreter */
+			p->pcre2_jit_on = 0;
+			return;
+		}
 
 		/*
 		 * The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
-- 
2.20.0