From: Lukas Schwaighofer 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));