Add no-math-errno for GCC when build for Release (#20503)

* gcc matherrno
* changelog

changelog.md

@@ -2,7 +2,7 @@
 
 
 ## Changes affecting backward compatibility
-- `httpclient.contentLength` default to `-1` if the Content-Length header is not set in the response, it followed Apache HttpClient(Java), http(go) and .Net HttpWebResponse(C#) behavior. Previously raise `ValueError`.  
+- `httpclient.contentLength` default to `-1` if the Content-Length header is not set in the response, it followed Apache HttpClient(Java), http(go) and .Net HttpWebResponse(C#) behavior. Previously raise `ValueError`.
 
 - `addr` is now available for all addressable locations,
   `unsafeAddr` is now deprecated and an alias for `addr`.
@@ -78,7 +78,7 @@
 
 - Static linking against OpenSSL versions below 1.1, previously done by
   setting `-d:openssl10`, is no longer supported.
-  
+
 - `macros.getImpl` for `const` symbols now returns the full definition node
   (as `nnkConstDef`) rather than the AST of the constant value.
 
@@ -221,6 +221,8 @@
   related functions produced on the backend. This prevents conflicts with other Nim
   static libraries.
 
+- When compiling for Release the flag `-fno-math-errno` is used for GCC.
+
 
 ## Tool changes
 

config/nim.cfg

@@ -250,14 +250,17 @@ clang.objc.options.linker = "-lobjc -lgnustep-base"
   gcc.options.linker %= "-L $WIND_BASE/target/lib/usr/lib/ppc/PPC32/common -mrtp -fno-strict-aliasing -D_C99 -D_HAS_C9X -std=c99 -fasm -Wall -Wno-write-strings"
 @end
 
-gcc.options.speed = "-O3 -fno-strict-aliasing -fno-ident"
+# -fno-math-errno is default in OSX, iOS, BSD, Musl, Libm, LLVM, Clang, ICC.
+# See https://itnext.io/why-standard-c-math-functions-are-slow-d10d02554e33
+# and https://gcc.gnu.org/onlinedocs/gcc-12.2.0/gcc/Optimize-Options.html#Optimize-Options
+gcc.options.speed = "-O3 -fno-strict-aliasing -fno-ident -fno-math-errno"
 gcc.options.size = "-Os -fno-ident"
 @if windows:
   gcc.options.debug = "-g3 -Og -gdwarf-3"
 @else:
   gcc.options.debug = "-g3 -Og"
 @end
-gcc.cpp.options.speed = "-O3 -fno-strict-aliasing -fno-ident"
+gcc.cpp.options.speed = "-O3 -fno-strict-aliasing -fno-ident -fno-math-errno"
 gcc.cpp.options.size = "-Os -fno-ident"
 gcc.cpp.options.debug = "-g3 -Og"
 #passl = "-pg"