-ffast-math changes the floating point rounding mode globally, which

is undesirable for shared libraries. 

see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55522

for details.

Index: soundtouch/CMakeLists.txt

===================================================================

--- soundtouch.orig/CMakeLists.txt

+++ soundtouch/CMakeLists.txt

@@ -3,13 +3,6 @@ project(SoundTouch VERSION 2.3.2 LANGUAG

 include(GNUInstallDirs)

-if(MSVC)

-  set(COMPILE_DEFINITIONS /O2 /fp:fast)

-  set(COMPILE_OPTIONS )

-else()

-  set(COMPILE_OPTIONS -Ofast)

-endif()

-

 #####################

 # SoundTouch library

Index: soundtouch/configure.ac

===================================================================

--- soundtouch.orig/configure.ac

+++ soundtouch/configure.ac

@@ -33,7 +33,7 @@ AC_LANG(C++)

 # Compiler flags. Apply -Ofast (implies -O3 -ffast-math) to allow gcc autovectorization

 # generate effective SIMD code.

-CXXFLAGS+=" -Ofast"

+CXXFLAGS+=" -O2"

 # Set AR_FLAGS to avoid build warning "ar: `u' modifier ignored since `D' is the default (see `U')"

 AR_FLAGS='cr'