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From: Lukas Schwaighofer <lukas@schwaighofer.name>
Date: Tue, 26 Feb 2019 23:13:58 +0100
Subject: Prevent optimizing the pow() function
With the current GCC 8.2.0 from Debian, a section of code calling pow() in
zzjson_parse.c is turned into a sequence calling exp(). Since no exp()
implementation is available in syslinux those optimizations need to be
disabled.
---
com32/gpllib/zzjson/zzjson_parse.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/com32/gpllib/zzjson/zzjson_parse.c b/com32/gpllib/zzjson/zzjson_parse.c
index ecb6f61..e66a9d8 100644
--- a/com32/gpllib/zzjson/zzjson_parse.c
+++ b/com32/gpllib/zzjson/zzjson_parse.c
@@ -138,6 +138,10 @@ static ZZJSON *parse_string2(ZZJSON_CONFIG *config) {
return zzjson;
}
+static double __attribute__((optimize("O0"))) pow_noopt(double x, double y) {
+ return pow(x, y);
+}
+
static ZZJSON *parse_number(ZZJSON_CONFIG *config) {
ZZJSON *zzjson;
unsigned long long ival = 0, expo = 0;
@@ -213,7 +217,7 @@ skipexpo:
if (dbl) {
dval = sign * (long long) ival;
dval += sign * frac;
- dval *= pow(10.0, (double) signexpo * expo);
+ dval *= pow_noopt(10.0, (double) signexpo * expo);
}
zzjson = config->calloc(1, sizeof(ZZJSON));
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