openblas: Use less aggressive optimization level.

See also: OpenMathLib/OpenBLAS#3740

Fixes msys2#12857

mingw-w64-openblas/PKGBUILD

@@ -6,7 +6,7 @@ pkgbase=mingw-w64-openblas
 pkgname=("${MINGW_PACKAGE_PREFIX}-openblas"
          $([[ "${CARCH}" == "i686" ]] || echo "${MINGW_PACKAGE_PREFIX}-openblas64"))
 pkgver=0.3.21
-pkgrel=1
+pkgrel=2
 pkgdesc="An optimized BLAS library based on GotoBLAS2 1.13 BSD, providing optimized blas, lapack, and cblas (mingw-w64)"
 arch=('any')
 mingw_arch=('mingw32' 'mingw64' 'ucrt64' 'clang64' 'clang32' 'clangarm64')
@@ -58,12 +58,27 @@ _build_openblas() {
   _idx_opt=$1
 
   declare -a _build_type
+  declare -a _optimization_opts
   if check_option "debug" "n"; then
-    _build_type+=("Release")
+    # See: https://wiki.archlinux.org/title/CMake_package_guidelines#CMake_can_automatically_override_the_default_compiler_optimization_flag
+    _build_type+=("None")
+    if [[ ${MINGW_PACKAGE_PREFIX} == *-clang-* ]]; then
+      _optimization_opts=("-DCOMMON_OPT=-O2"
+                          "-DCCOMMON_OPT=-O2"
+                          "-DFCOMMON_OPT=-O2")
+    else
+      # GCC 12 enables `-ftree-vectorize` at optimization level `-O2`.
+      # Library built with that optimization might segfault for some functions.
+      # See also: https://github.com/xianyi/OpenBLAS/issues/3740
+      _optimization_opts=("-DCOMMON_OPT=-O2 -fno-tree-vectorize"
+                          "-DCCOMMON_OPT=-O2 -fno-tree-vectorize"
+                          "-DFCOMMON_OPT=-O2 -fno-tree-vectorize")
+    fi
   else
     _build_type+=("Debug")
   fi
 
+  declare _c_lapack_opt
   if [[ ${MINGW_PACKAGE_PREFIX} == *-clang-* ]]; then
     _c_lapack_opt="-DC_LAPACK=ON"
   fi
@@ -93,6 +108,7 @@ _build_openblas() {
     -DTARGET=${target} \
     ${_c_lapack_opt} \
     ${_idx_opt} \
+    "${_optimization_opts[@]}" \
     ../${_realname}-${pkgver}
 
   ${MINGW_PREFIX}/bin/cmake --build .