Work around pytest bug

Due to pytest-dev/pytest#10169 we can't have
command line flags with long names since pytest will check if any argument
is a valid path (even if it's registered as a command line option) and
Path.exist() may raise an exception which kills the entire pytest process.
Work around this by splitting the single list of unsupported options into
one option per feature.

Author: arichardson

Makefile.predicates.mk

@@ -185,7 +185,7 @@ beri_statcounters \
 no_dext
 
 
-GXEMUL_NOSEFLAGS=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(GXEMUL_UNSUPPORTED_FEATURES)"
+GXEMUL_NOSEFLAGS=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(GXEMUL_UNSUPPORTED_FEATURES))
 
 
 ####### L3 predicates #######
@@ -225,8 +225,8 @@ L3_UNSUPPORTED_FEATURES+=$(FLOAT_FEATURES) watch
 
 L3_UNSUPPORTED_FEATURES+=ccall_hw_1
 
-L3_NOSEFLAGS=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(L3_UNSUPPORTED_FEATURES)"
-L3_NOSEFLAGS_UNCACHED=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(L3_UNSUPPORTED_FEATURES) cached"
+L3_NOSEFLAGS=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(L3_UNSUPPORTED_FEATURES))
+L3_NOSEFLAGS_UNCACHED=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(L3_UNSUPPORTED_FEATURES) cached)
 
 ####### sail predicates #######
 
@@ -269,9 +269,9 @@ experimental_csc \
 watch
 
 
-SAIL_MIPS_NOSEFLAGS=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(SAIL_UNSUPPORTED_FEATURES) capabilities"
-SAIL_CHERI_NOSEFLAGS=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(SAIL_UNSUPPORTED_FEATURES)"
-SAIL_CHERI128_NOSEFLAGS=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(SAIL_UNSUPPORTED_FEATURES)"
+SAIL_MIPS_NOSEFLAGS=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(SAIL_UNSUPPORTED_FEATURES) capabilities)
+SAIL_CHERI_NOSEFLAGS=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(SAIL_UNSUPPORTED_FEATURES))
+SAIL_CHERI128_NOSEFLAGS=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(SAIL_UNSUPPORTED_FEATURES))
 
 
 ####### QEMU predicates #######
@@ -355,7 +355,7 @@ QEMU_UNSUPPORTED_FEATURES_FINAL=$(filter-out qemu_magic_nops,$(QEMU_UNSUPPORTED_
 
 # QEMU_UNSUPPORTED_FEATURES+=beri_statcounters
 
-QEMU_NOSEFLAGS=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(QEMU_UNSUPPORTED_FEATURES_FINAL)" --unsupported-feature-if-equal "$(QEMU_UNSUPPORTED_IF)"
+QEMU_NOSEFLAGS=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(QEMU_UNSUPPORTED_FEATURES_FINAL)) $(addprefix --unsupported-feature-if-equal=,$(QEMU_UNSUPPORTED_IF))
 
 
 
@@ -423,6 +423,6 @@ endif
 endif
 
 ifneq ($(NOSEPRED),)
-NOSEFLAGS?=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(NOSEPRED) uncached" --unsupported-feature-if-equal "$(COMMON_UNSUPPORTED_FEATURES_IF)"
-NOSEFLAGS_UNCACHED?=$(PYTHON_TEST_ATTRIB_SELETOR_FLAG) "$(NOSEPRED) cached" --unsupported-feature-if-equal "$(COMMON_UNSUPPORTED_FEATURES_IF)"
+NOSEFLAGS?=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(NOSEPRED) uncached) $(addprefix --unsupported-feature-if-equal=,$(COMMON_UNSUPPORTED_FEATURES_IF))
+NOSEFLAGS_UNCACHED?=$(addprefix $(PYTHON_TEST_ATTRIB_SELETOR_FLAG)=,$(NOSEPRED) cached) $(addprefix --unsupported-feature-if-equal=,$(COMMON_UNSUPPORTED_FEATURES_IF))
 endif