glsl: Handle failure of Python codegen scripts.

If a Python codegen script failed, it would write a zero-byte file,
which on subsequent invocations of make would trick it into thinking the
file was appropriately generated.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

diff --git a/src/glsl/Makefile.am b/src/glsl/Makefile.am
index 95efdb327c1af159beaa27618c43ec3660213a0c..ba7af7c779df4910b4e2fb4b374733ed1d49bdf5 100644 (file)
--- a/src/glsl/Makefile.am
+++ b/src/glsl/Makefile.am
@@ -247,23 +247,23 @@ PYTHON_GEN = $(AM_V_GEN)$(PYTHON2) $(PYTHON_FLAGS)
 
 nir/nir_builder_opcodes.h: nir/nir_opcodes.py nir/nir_builder_opcodes_h.py
        $(MKDIR_GEN)
-       $(PYTHON_GEN) $(srcdir)/nir/nir_builder_opcodes_h.py > $@
+       $(PYTHON_GEN) $(srcdir)/nir/nir_builder_opcodes_h.py > $@ || ($(RM) $@; false)
 
 nir/nir_constant_expressions.c: nir/nir_opcodes.py nir/nir_constant_expressions.py
        $(MKDIR_GEN)
-       $(PYTHON_GEN) $(srcdir)/nir/nir_constant_expressions.py > $@
+       $(PYTHON_GEN) $(srcdir)/nir/nir_constant_expressions.py > $@ || ($(RM) $@; false)
 
 nir/nir_opcodes.h: nir/nir_opcodes.py nir/nir_opcodes_h.py
        $(MKDIR_GEN)
-       $(PYTHON_GEN) $(srcdir)/nir/nir_opcodes_h.py > $@
+       $(PYTHON_GEN) $(srcdir)/nir/nir_opcodes_h.py > $@ || ($(RM) $@; false)
 
 nir/nir_opcodes.c: nir/nir_opcodes.py nir/nir_opcodes_c.py
        $(MKDIR_GEN)
-       $(PYTHON_GEN) $(srcdir)/nir/nir_opcodes_c.py > $@
+       $(PYTHON_GEN) $(srcdir)/nir/nir_opcodes_c.py > $@ || ($(RM) $@; false)
 
 nir/nir_opt_algebraic.c: nir/nir_opt_algebraic.py nir/nir_algebraic.py
        $(MKDIR_GEN)
-       $(PYTHON_GEN) $(srcdir)/nir/nir_opt_algebraic.py > $@
+       $(PYTHON_GEN) $(srcdir)/nir/nir_opt_algebraic.py > $@ || ($(RM) $@; false)
 
 nir_tests_control_flow_tests_SOURCES =                 \
        nir/tests/control_flow_tests.cpp