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