https://llvm.org/bugs/show_bug.cgi?id=28973
Bug ID: 28973
Summary: clang -fopenmp -ffast-math causes compile failures
with gnu math.h
Product: clang
Version: 3.7
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: dan_gulo...@yahoo.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
When OpenMP is enabled in Clang, the _OPENMP macro is set to 201307, indicating
support for OpenMP 4. Defining the _OPENMP macro this way will cause some
header files to try to use OpenMP 4 features not yet supported by Clang. In
particular, GNU's bits/math-vector.h will use "omp declare simd notinbranch"
when __FAST_MATH__ is defined and _OPENMP >= 201307, leading to compile errors.
Manually defining _OPENMP to be 201107 makes the problem go away.
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