Add an toolchain compiler option for enforcing IEEE-754 conformance.

This very useful for building for instance LAPACK and ScaLAPACK which
should be built to not trap on Nan/Inf/denormals since the code handles
that internally.

Author: akesandgren

easybuild/toolchains/compiler/gcc.py

@@ -57,6 +57,7 @@ class Gcc(Compiler):
         'loop': ['ftree-switch-conversion', 'floop-interchange', 'floop-strip-mine', 'floop-block'],
         'lto': 'flto',
         'openmp': 'fopenmp',
+        'ieee': ['mieee-fp', 'fno-trapping-math'],
         'strict': ['mieee-fp', 'mno-recip'],
         'precise':['mno-recip'],
         'defaultprec':[],

easybuild/toolchains/compiler/inteliccifort.py

@@ -59,6 +59,7 @@ class IntelIccIfort(Compiler):
         'r8': 'r8',
         'optarch': 'xHost',
         'openmp': 'fopenmp',  # both -qopenmp/-fopenmp are valid for enabling OpenMP (-openmp is deprecated)
+        'ieee': 'fltconsistency',
         'strict': ['fp-speculation=strict', 'fp-model strict'],
         'precise': ['fp-model precise'],
         'defaultprec': ['ftz', 'fp-speculation=safe', 'fp-model source'],

easybuild/toolchains/compiler/pgi.py

@@ -59,6 +59,7 @@ class Pgi(Compiler):
         'r8': 'r8',
         'optarch': '', # PGI by default generates code for the arch it is running on!
         'openmp': 'mp',
+        'ieee': 'Kieee',
         'strict': ['Mnoflushz','Kieee'],
         'precise': ['Mnoflushz'],
         'defaultprec': ['Mflushz'],

easybuild/tools/toolchain/compiler.py

@@ -63,6 +63,7 @@ class Compiler(Toolchain):
     COMPILER_SHARED_OPTS = {
         'cciscxx': (False, "Use CC as CXX"),  # also MPI
         'pic': (False, "Use PIC"),  # also FFTW
+        'ieee': (False, "Adhere to IEEE-754 rules"),
         'noopt': (False, "Disable compiler optimizations"),
         'lowopt': (False, "Low compiler optimizations"),
         DEFAULT_OPT_LEVEL: (False, "Default compiler optimizations"),  # not set, but default