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py-cffi: add compiler flags to fix build with clang (#29679)

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* py-cffi: add compiler flags to fix build with clang

For %clang@13.0.1, this avoids the
```
clang-13: warning: optimization flag '-ffat-lto-objects' is not supported [-Wignored-optimization-argument]
```
warning being turned into an error, and fixes this link error:
```
build/temp.linux-x86_64-3.10/c/_cffi_backend.o: file not recognized: file format not recognized
```

* style
This commit is contained in:
Valentin Volkl 2022-03-23 19:49:36 +01:00 committed by GitHub
parent c300b92047
commit 34732c57b3
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 0 deletions
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10
var/spack/repos/builtin/packages/py-cffi/package.py
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@ -28,6 +28,16 @@ class PyCffi(PythonPackage):
depends_on('py-pycparser', type=('build', 'run'))
depends_on('libffi')
def flag_handler(self, name, flags):
if self.spec.satisfies('%clang@13:'):
if name in ['cflags', 'cxxflags', 'cppflags']:
flags.append('-Wno-error=ignored-optimization-argument')
return (flags, None, None)
if name == 'ldflags':
flags.append('-flto')
return (flags, None, None)
return (flags, None, None)
def setup_build_environment(self, env):
# This sets the compiler (and flags) that distutils will use
# to create the final shared library. It will use the