I don't know if it's the correct fix but the static int clearly introduces an
issue with threads and multiple instances of tcc.
-----Original Message-----
From: Tinycc-devel [mailto:tinycc-devel-bounces+eligis=address@hidden] On
Behalf Of Herman ten Brugge via Tinycc-devel
Sent: Friday, December 13, 2019 09:30
To: Herman ten Brugge via Tinycc-devel
Cc: Herman ten Brugge
Subject: [Tinycc-devel] gdb problems [make tcc reentrant]
When I try to start gdb on a program called with tcc I get:
../../gdb/buildsym.c:660: internal-error: const char*
buildsym_compunit::pop_subfile(): Assertion `!m_subfile_stack.empty ()'
failed.
I find that the stab section contains an extra entry at start (objdump -G):
-1 HdrSym 0 0 0000000000000000 1
0 SO 0 0 0000000000400355 2
1 SO 0 0 0000000000400355 35
2 SLINE 0 1 0000000000000000 0
3 EINCL 0 0 0000000000000000 0
4 SLINE 0 2 0000000000000000 0
5 FUN 0 3 0000000000400355 39 main:F1
The entry 3 is not present before the tcc reentrant commit.
I fixed it by the patch below. This makes debugging work again.
There is probably a better solution.
Regards,
Herman
diff --git a/tccpp.c b/tccpp.c
index 3eb5213..029fd1b 100644
--- a/tccpp.c
+++ b/tccpp.c
@@ -2631,7 +2631,11 @@ static inline void next_nomacro1(void)
/* add end of include file debug info */
if (tcc_state->do_debug) {
+static int first = 1;
+if (first == 0) {
put_stabd(tcc_state, N_EINCL, 0, 0);
+}
+first = 0;
}
/* pop include stack */
tcc_close();
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