From 23b2f96c9d043806a30df86258238ae001241057 Mon Sep 17 00:00:00 2001
From: p-szafonimateusz <p-szafonimateusz@xiaomi.com>
Date: Fri, 24 May 2024 09:17:08 +0200
Subject: [PATCH] libm/libm: disable optimization for sincos

Disable sincos optimization for all functions in this file,
otherwise gcc would generate infinite calls.
Refer to gcc bug 46926.
-fno-builtin-sin or -fno-builtin-cos can disable sincos optimization,
but these two options do not work inside optimize pragma in-file.
Thus we just enforce -O0 when compiling this file.

Signed-off-by: p-szafonimateusz <p-szafonimateusz@xiaomi.com>
---
 libs/libm/libm/lib_sincos.c  | 9 +++++++++
 libs/libm/libm/lib_sincosf.c | 9 +++++++++
 libs/libm/libm/lib_sincosl.c | 9 +++++++++
 3 files changed, 27 insertions(+)

diff --git a/libs/libm/libm/lib_sincos.c b/libs/libm/libm/lib_sincos.c
index fd00547edd..a3c3fc82ae 100644
--- a/libs/libm/libm/lib_sincos.c
+++ b/libs/libm/libm/lib_sincos.c
@@ -27,12 +27,21 @@
 
 #include <math.h>
 
+/* Disable sincos optimization for all functions in this file,
+ * otherwise gcc would generate infinite calls.
+ * Refer to gcc PR46926.
+ * -fno-builtin-sin or -fno-builtin-cos can disable sincos optimization,
+ * but these two options do not work inside optimize pragma in-file.
+ * Thus we just enforce -O0 when compiling this file.
+ */
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
 
 #ifdef CONFIG_HAVE_DOUBLE
 
+nooptimiziation_function
 void sincos(double x, double *s, double *c)
 {
   *s = sin(x);
diff --git a/libs/libm/libm/lib_sincosf.c b/libs/libm/libm/lib_sincosf.c
index 311c36f6fb..064cb0e757 100644
--- a/libs/libm/libm/lib_sincosf.c
+++ b/libs/libm/libm/lib_sincosf.c
@@ -27,10 +27,19 @@
 
 #include <math.h>
 
+/* Disable sincos optimization for all functions in this file,
+ * otherwise gcc would generate infinite calls.
+ * Refer to gcc PR46926.
+ * -fno-builtin-sin or -fno-builtin-cos can disable sincos optimization,
+ * but these two options do not work inside optimize pragma in-file.
+ * Thus we just enforce -O0 when compiling this file.
+ */
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
 
+nooptimiziation_function
 void sincosf(float x, float *s, float *c)
 {
   *s = sinf(x);
diff --git a/libs/libm/libm/lib_sincosl.c b/libs/libm/libm/lib_sincosl.c
index 864e1fd67b..1512765c70 100644
--- a/libs/libm/libm/lib_sincosl.c
+++ b/libs/libm/libm/lib_sincosl.c
@@ -27,12 +27,21 @@
 
 #include <math.h>
 
+/* Disable sincos optimization for all functions in this file,
+ * otherwise gcc would generate infinite calls.
+ * Refer to gcc PR46926.
+ * -fno-builtin-sin or -fno-builtin-cos can disable sincos optimization,
+ * but these two options do not work inside optimize pragma in-file.
+ * Thus we just enforce -O0 when compiling this file.
+ */
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
 
 #ifdef CONFIG_HAVE_LONG_DOUBLE
 
+nooptimiziation_function
 void sincosl(long double x, long double *s, long double *c)
 {
   *s = sinl(x);