use ignore directives for run-make tests

This makes the tests easier to read, and makes it possible to tell which
tests aren't being run on the host platform.

Fixes #56704.

src/test/run-make-fulldeps/c-dynamic-dylib/Makefile

@@ -1,14 +1,12 @@
 -include ../tools.mk
 
+# ignore-macos
+#
 # This hits an assertion in the linker on older versions of osx apparently
-ifeq ($(shell uname),Darwin)
-all:
-	echo ignored
-else
+
 all: $(call DYLIB,cfoo)
 	$(RUSTC) foo.rs -C prefer-dynamic
 	$(RUSTC) bar.rs
 	$(call RUN,bar)
 	$(call REMOVE_DYLIBS,cfoo)
 	$(call FAIL,bar)
-endif

src/test/run-make-fulldeps/c-dynamic-rlib/Makefile

@@ -1,17 +1,15 @@
 -include ../tools.mk
 
+# ignore-macos
+#
+# This hits an assertion in the linker on older versions of osx apparently
+
 # This overrides the LD_LIBRARY_PATH for RUN
 TARGET_RPATH_DIR:=$(TARGET_RPATH_DIR):$(TMPDIR)
 
-# This hits an assertion in the linker on older versions of osx apparently
-ifeq ($(shell uname),Darwin)
-all:
-	echo ignored
-else
 all: $(call DYLIB,cfoo)
 	$(RUSTC) foo.rs
 	$(RUSTC) bar.rs
 	$(call RUN,bar)
 	$(call REMOVE_DYLIBS,cfoo)
 	$(call FAIL,bar)
-endif

src/test/run-make-fulldeps/c-link-to-rust-staticlib/Makefile

@@ -1,16 +1,12 @@
 -include ../tools.mk
 
-# FIXME: ignore freebsd
-ifneq ($(shell uname),FreeBSD)
+# ignore-freebsd
+# FIXME
+
 all:
 	$(RUSTC) foo.rs
 	$(CC) bar.c $(call STATICLIB,foo) $(call OUT_EXE,bar) \
 		$(EXTRACFLAGS) $(EXTRACXXFLAGS)
 	$(call RUN,bar)
 	rm $(call STATICLIB,foo)
 	$(call RUN,bar)
-
-else
-all:
-
-endif

src/test/run-make-fulldeps/cdylib-fewer-symbols/Makefile

@@ -3,13 +3,10 @@
 
 -include ../tools.mk
 
+# ignore-windows
 # FIXME: The __rdl_ and __rust_ symbol still remains, no matter using MSVC or GNU
 # See https://github.com/rust-lang/rust/pull/46207#issuecomment-347561753
-ifdef IS_WINDOWS
-all:
-	true
-else
+
 all:
 	$(RUSTC) foo.rs
 	nm -g "$(call DYLIB,foo)" | $(CGREP) -v __rdl_ __rde_ __rg_ __rust_
-endif

src/test/run-make-fulldeps/compiler-rt-works-on-mingw/Makefile

@@ -1,17 +1,9 @@
 -include ../tools.mk
 
-ifneq (,$(findstring MINGW,$(UNAME)))
-ifndef IS_MSVC
+# only-mingw
+
 all:
 	$(CXX) foo.cpp -c -o $(TMPDIR)/foo.o
 	$(AR) crus $(TMPDIR)/libfoo.a $(TMPDIR)/foo.o
 	$(RUSTC) foo.rs -lfoo -lstdc++
 	$(call RUN,foo)
-else
-all:
-
-endif
-else
-all:
-
-endif

src/test/run-make-fulldeps/dep-info-spaces/Makefile

@@ -1,9 +1,9 @@
 -include ../tools.mk
 
-# FIXME: ignore freebsd/windows
-# (windows: see `../dep-info/Makefile`)
-ifneq ($(shell uname),FreeBSD)
-ifndef IS_WINDOWS
+# ignore-windows
+# ignore-freebsd
+# FIXME: (windows: see `../dep-info/Makefile`)
+
 all:
 	cp lib.rs $(TMPDIR)/
 	cp 'foo foo.rs' $(TMPDIR)/
@@ -17,12 +17,3 @@ all:
 	pwd
 	$(MAKE) -drf Makefile.foo
 	rm $(TMPDIR)/done && exit 1 || exit 0
-else
-all:
-
-endif
-
-else
-all:
-
-endif

src/test/run-make-fulldeps/dep-info/Makefile

@@ -1,11 +1,11 @@
 -include ../tools.mk
 
-# FIXME: ignore freebsd/windows
-# on windows `rustc --dep-info` produces Makefile dependency with
+# ignore-windows
+# ignore-freebsd
+# FIXME: on windows `rustc --dep-info` produces Makefile dependency with
 # windows native paths (e.g. `c:\path\to\libfoo.a`)
 # but msys make seems to fail to recognize such paths, so test fails.
-ifneq ($(shell uname),FreeBSD)
-ifndef IS_WINDOWS
+
 all:
 	cp *.rs $(TMPDIR)
 	$(RUSTC) --emit dep-info,link --crate-type=lib $(TMPDIR)/lib.rs
@@ -23,12 +23,3 @@ all:
 	rm $(TMPDIR)/bar.rs
 	cp $(TMPDIR)/lib2.rs $(TMPDIR)/lib.rs
 	$(MAKE) -drf Makefile.foo
-else
-all:
-
-endif
-
-else
-all:
-
-endif

src/test/run-make-fulldeps/emit-stack-sizes/Makefile

@@ -1,31 +1,13 @@
 -include ../tools.mk
 
+# ignore-windows
+# ignore-macos
+# min-llvm-version 6.0
+#
 # This feature only works when the output object format is ELF so we ignore
 # macOS and Windows
-ifdef IS_WINDOWS
-# Do nothing on Windows.
-all:
-	exit 0
-else ifneq (,$(filter $(TARGET),i686-apple-darwin x86_64-apple-darwin))
-# Do nothing on macOS.
-all:
-	exit 0
-else
+
 # check that the .stack_sizes section is generated
-# this test requires LLVM >= 6.0.0
-vers = $(shell $(RUSTC) -Vv)
-ifneq (,$(findstring LLVM version: 3,$(vers)))
-all:
-	exit 0
-else ifneq (,$(findstring LLVM version: 4,$(vers)))
-all:
-	exit 0
-else ifneq (,$(findstring LLVM version: 5,$(vers)))
-all:
-	exit 0
-else
 all:
 	$(RUSTC) -C opt-level=3 -Z emit-stack-sizes --emit=obj foo.rs
 	size -A $(TMPDIR)/foo.o | $(CGREP) .stack_sizes
-endif
-endif

src/test/run-make-fulldeps/fpic/Makefile

@@ -1,13 +1,10 @@
 -include ../tools.mk
 
+# ignore-windows
+# ignore-macos
+
 # Test for #39529.
 # `-z text` causes ld to error if there are any non-PIC sections
 
-ifeq ($(UNAME),Darwin)
-all:
-else ifdef IS_WINDOWS
-all:
-else
 all:
 	$(RUSTC) hello.rs -C link-args=-Wl,-z,text
-endif

src/test/run-make-fulldeps/include_bytes_deps/Makefile

@@ -1,20 +1,11 @@
 -include ../tools.mk
 
-# FIXME: ignore freebsd/windows
-# on windows `rustc --dep-info` produces Makefile dependency with
+# ignore-windows
+# ignore-freebsd
+# FIXME: on windows `rustc --dep-info` produces Makefile dependency with
 # windows native paths (e.g. `c:\path\to\libfoo.a`)
 # but msys make seems to fail to recognize such paths, so test fails.
-ifneq ($(shell uname),FreeBSD)
-ifndef IS_WINDOWS
+
 all:
 	$(RUSTC) --emit dep-info main.rs
 	$(CGREP) "input.txt" "input.bin" "input.md" < $(TMPDIR)/main.d
-else
-all:
-
-endif
-
-else
-all:
-
-endif

src/test/run-make-fulldeps/intrinsic-unreachable/Makefile

@@ -1,15 +1,11 @@
 -include ../tools.mk
 
-ifndef IS_WINDOWS
-# The assembly for exit-unreachable.rs should be shorter because it's missing
-# (at minimum) a return instruction.
+# ignore-windows
+#
+# Because of Windows exception handling, the code is not necessarily any shorter.
+# https://github.com/llvm-mirror/llvm/commit/64b2297786f7fd6f5fa24cdd4db0298fbf211466
 
 all:
 	$(RUSTC) -O --emit asm exit-ret.rs
 	$(RUSTC) -O --emit asm exit-unreachable.rs
 	test `wc -l < $(TMPDIR)/exit-unreachable.s` -lt `wc -l < $(TMPDIR)/exit-ret.s`
-else
-# Because of Windows exception handling, the code is not necessarily any shorter.
-# https://github.com/llvm-mirror/llvm/commit/64b2297786f7fd6f5fa24cdd4db0298fbf211466
-all:
-endif

src/test/run-make-fulldeps/issue-24445/Makefile

@@ -1,12 +1,10 @@
 -include ../tools.mk
 
-ifeq ($(UNAME),Linux)
+# only-linux
+
 all:
 	$(RUSTC) foo.rs
 	$(CC) foo.c -lfoo -L $(TMPDIR) -Wl,--gc-sections -lpthread -ldl -o $(TMPDIR)/foo
 	$(call RUN,foo)
 	$(CC) foo.c -lfoo -L $(TMPDIR) -Wl,--gc-sections -lpthread -ldl -pie -fPIC -o $(TMPDIR)/foo
 	$(call RUN,foo)
-else
-all:
-endif

src/test/run-make-fulldeps/issue-26006/Makefile

@@ -1,8 +1,9 @@
 -include ../tools.mk
 
+# ignore-windows
+
 OUT := $(TMPDIR)/out
 
-ifndef IS_WINDOWS
 all: time
 
 time: libc
@@ -13,6 +14,3 @@ time: libc
 libc:
 	mkdir -p $(OUT)/libc
 	$(RUSTC) in/libc/lib.rs --crate-name=libc -Cmetadata=foo -o $(OUT)/libc/liblibc.rlib
-else
-all:
-endif

src/test/run-make-fulldeps/issue-36710/Makefile

@@ -1,21 +1,12 @@
 -include ../tools.mk
 
-ifeq (musl,$(findstring musl,$(TARGET)))
-all: skip
-else
-all: test
-endif
+# ignore-musl
 
-test: foo
+all: foo
 	$(call RUN,foo)
 
-skip:
-	echo "expected failure"
-
 foo: foo.rs $(call NATIVE_STATICLIB,foo)
 	$(RUSTC) $< -lfoo $(EXTRACXXFLAGS)
 
 $(TMPDIR)/libfoo.o: foo.cpp
 	$(call COMPILE_OBJ_CXX,$@,$<)
-
-.PHONY: all test skip

src/test/run-make-fulldeps/issue-37839/Makefile

@@ -1,12 +1,8 @@
 -include ../tools.mk
 
-ifeq ($(findstring stage1,$(RUST_BUILD_STAGE)),stage1)
-# ignore stage1
-all:
+# ignore-stage1
 
-else
 all:
 	$(RUSTC) a.rs && $(RUSTC) b.rs
 	$(BARE_RUSTC) c.rs -L dependency=$(TMPDIR) --extern b=$(TMPDIR)/libb.rlib \
 		--out-dir=$(TMPDIR)
-endif

src/test/run-make-fulldeps/issue-37893/Makefile

@@ -1,10 +1,6 @@
 -include ../tools.mk
 
-ifeq ($(findstring stage1,$(RUST_BUILD_STAGE)),stage1)
-# ignore stage1
-all:
+# ignore-stage1
 
-else
 all:
 	$(RUSTC) a.rs && $(RUSTC) b.rs && $(RUSTC) c.rs
-endif

src/test/run-make-fulldeps/issue-51671/Makefile

@@ -1,13 +1,9 @@
 -include ../tools.mk
 
-ifdef IS_WINDOWS
-# Do nothing on MSVC.
-all:
-	exit 0
-else
+# ignore-windows
+
 all:
 	$(RUSTC) --emit=obj app.rs
 	nm $(TMPDIR)/app.o | $(CGREP) rust_begin_unwind
 	nm $(TMPDIR)/app.o | $(CGREP) rust_eh_personality
 	nm $(TMPDIR)/app.o | $(CGREP) rust_oom
-endif

src/test/run-make-fulldeps/libs-search-path/Makefile

@@ -1,16 +1,10 @@
 -include ../tools.mk
 
-ifeq ($(if $(IS_WINDOWS),$(IS_MSVC),no),)
+# only-mingw
 
 all: empty.rs
 	cp -r $(shell cygpath -u $(shell $(RUSTC) --print sysroot)) $(TMPDIR)/sysroot
 	$(RUSTC) --target $(TARGET) --sysroot $(TMPDIR)/sysroot -L$(TMPDIR)/obj -Z print-link-args empty.rs | $(CGREP) 'lib\\crt2.o'
 	mkdir -p $(TMPDIR)/obj
 	mv $(TMPDIR)/sysroot/lib/rustlib/$(TARGET)/lib/crt2.o $(TMPDIR)/obj/crt2.o
 	$(RUSTC) --target $(TARGET) --sysroot $(TMPDIR)/sysroot -L$(TMPDIR)/obj -Z print-link-args empty.rs | $(CGREP) 'obj\\crt2.o'
-
-else
-
-all:
-
-endif

src/test/run-make-fulldeps/libs-through-symlinks/Makefile

@@ -1,8 +1,6 @@
 -include ../tools.mk
 
-ifdef IS_WINDOWS
-all:
-else
+# ignore-windows
 
 NAME := $(shell $(RUSTC) --print file-names foo.rs)
 
@@ -11,4 +9,3 @@ all:
 	$(RUSTC) foo.rs -o $(TMPDIR)/outdir/$(NAME)
 	ln -nsf outdir/$(NAME) $(TMPDIR)
 	RUST_LOG=rustc_metadata::loader $(RUSTC) bar.rs
-endif