use optimization option

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = python36
 	pkgdesc = Major release 3.6 of the Python high-level programming language
 	pkgver = 3.6.13
-	pkgrel = 1
+	pkgrel = 2
 	url = http://www.python.org/
 	arch = i686
 	arch = x86_64
@@ -22,7 +22,9 @@ pkgbase = python36
 	optdepends = sqlite
 	options = !makeflags
 	source = http://www.python.org/ftp/python/3.6.13/Python-3.6.13.tar.xz
+	source = fix-faulthandler._stack_overflow-on-GCC-10.patch
 	sha256sums = a47a43a53abb42286a2c11965343ff56711b9e64e8d11bf2c6701a4fb8ce1a0f
+	sha256sums = 4146f0bff3b79cd05940e2274c6800897a60ae0264d2f05a150137da7c620fda
 
 pkgname = python36
 

PKGBUILD

@@ -3,7 +3,7 @@
 
 pkgname=python36
 pkgver=3.6.13
-pkgrel=1
+pkgrel=2
 _pybasever=3.6
 _pymajver=3
 pkgdesc="Major release 3.6 of the Python high-level programming language"
@@ -14,12 +14,21 @@ depends=('expat' 'bzip2' 'gdbm' 'openssl' 'libffi' 'zlib')
 makedepends=('tk' 'sqlite' 'bluez-libs' 'mpdecimal')
 optdepends=('tk: for tkinter' 'sqlite')
 options=('!makeflags')
-source=(http://www.python.org/ftp/python/${pkgver}/Python-${pkgver}.tar.xz)
-sha256sums=('a47a43a53abb42286a2c11965343ff56711b9e64e8d11bf2c6701a4fb8ce1a0f')
+source=(
+  http://www.python.org/ftp/python/${pkgver}/Python-${pkgver}.tar.xz
+  fix-faulthandler._stack_overflow-on-GCC-10.patch
+)
+sha256sums=(
+  'a47a43a53abb42286a2c11965343ff56711b9e64e8d11bf2c6701a4fb8ce1a0f'
+  '4146f0bff3b79cd05940e2274c6800897a60ae0264d2f05a150137da7c620fda'
+)
 
 prepare() {
   cd "${srcdir}/Python-${pkgver}"
 
+  # fix build with gcc10 #bpo-38965
+  patch --forward --strip=0 --input="${srcdir}/fix-faulthandler._stack_overflow-on-GCC-10.patch"
+
   # FS#23997
   sed -i -e "s|^#.* /usr/local/bin/python|#!/usr/bin/python|" Lib/cgi.py
 
@@ -44,9 +53,10 @@ build() {
               --with-system-libmpdec \
               --with-system-ffi \
               --enable-loadable-sqlite-extensions \
-              --without-ensurepip
+              --without-ensurepip \
+              --enable-optimizations
 
-  make
+  make -j$(nproc)
 }
 
 package() {

fix-faulthandler._stack_overflow-on-GCC-10.patch

@@ -0,0 +1,27 @@
+--- Modules/faulthandler.c
++++ Modules/faulthandler.c
+@@ -1161,18 +1161,14 @@ faulthandler_fatal_error_py(PyObject *self, PyObject *args)
+ #if defined(FAULTHANDLER_USE_ALT_STACK)
+ #define FAULTHANDLER_STACK_OVERFLOW
+ 
+-#ifdef __INTEL_COMPILER
+-   /* Issue #23654: Turn off ICC's tail call optimization for the
+-    * stack_overflow generator. ICC turns the recursive tail call into
+-    * a loop. */
+-#  pragma intel optimization_level 0
+-#endif
+-static
+-uintptr_t
++static uintptr_t
+ stack_overflow(uintptr_t min_sp, uintptr_t max_sp, size_t *depth)
+ {
+-    /* allocate 4096 bytes on the stack at each call */
+-    unsigned char buffer[4096];
++    /* Allocate (at least) 4096 bytes on the stack at each call.
++
++       bpo-23654, bpo-38965: use volatile keyword to prevent tail call
++       optimization. */
++    volatile unsigned char buffer[4096];
+     uintptr_t sp = (uintptr_t)&buffer;
+     *depth += 1;
+     if (sp < min_sp || max_sp < sp)