build/flags: Use auto-detection for all warning flags

9 files changed, 73 insertions, 12 deletions

diff --git a/build/flags.mk b/build/flags.mk
index afe19bc..1421ce6 100644
--- a/build/flags.mk
+++ b/build/flags.mk
@@ -67,16 +67,7 @@ _CPPFLAGS += ${RELEASE_CPPFLAGS,${_RELEASE}}
 _CFLAGS += ${RELEASE_CFLAGS,${_RELEASE}}
 
 # Configurable flags
-CFLAGS ?= \
-    -g \
-    -Wall \
-    -Wformat=2 \
-    -Werror=implicit \
-    -Wimplicit-fallthrough \
-    -Wmissing-declarations \
-    -Wshadow \
-    -Wsign-compare \
-    -Wstrict-prototypes
+CFLAGS ?= -g -Wall
 
 # Add the configurable flags last so they can override ours
 _CPPFLAGS += ${CPPFLAGS} ${EXTRA_CPPFLAGS}
@@ -89,9 +80,16 @@ include build/exports.mk
 
 # Conditionally-supported flags
 AUTO_FLAGS := \
+    gen/flags/Wformat.mk \
+    gen/flags/Wimplicit-fallthrough.mk \
+    gen/flags/Wimplicit.mk \
+    gen/flags/Wmissing-decls.mk \
+    gen/flags/Wmissing-var-decls.mk \
+    gen/flags/Wshadow.mk \
+    gen/flags/Wsign-compare.mk \
+    gen/flags/Wstrict-prototypes.mk \
     gen/flags/bind-now.mk \
-    gen/flags/deps.mk \
-    gen/flags/missing-var-decls.mk
+    gen/flags/deps.mk
 
 gen/flags.mk: ${AUTO_FLAGS}
 	${MSG} "[ GEN] $@"
diff --git a/build/flags/Wformat.c b/build/flags/Wformat.c
new file mode 100644
index 0000000..287b209
--- /dev/null
+++ b/build/flags/Wformat.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -Wformat=2
+/// -Werror
+
+int main(void) {
+	return 0;
+}
diff --git a/build/flags/Wimplicit-fallthrough.c b/build/flags/Wimplicit-fallthrough.c
new file mode 100644
index 0000000..c32058d
--- /dev/null
+++ b/build/flags/Wimplicit-fallthrough.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -Wimplicit-fallthrough
+/// -Werror
+
+int main(void) {
+	return 0;
+}
diff --git a/build/flags/Wimplicit.c b/build/flags/Wimplicit.c
new file mode 100644
index 0000000..3ea2b90
--- /dev/null
+++ b/build/flags/Wimplicit.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -Werror=implicit
+/// -Werror
+
+int main(void) {
+	return 0;
+}
diff --git a/build/flags/Wmissing-decls.c b/build/flags/Wmissing-decls.c
new file mode 100644
index 0000000..5ef3e96
--- /dev/null
+++ b/build/flags/Wmissing-decls.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -Wmissing-declarations
+/// -Werror
+
+int main(void) {
+	return 0;
+}
diff --git a/build/flags/missing-var-decls.c b/build/flags/Wmissing-var-decls.c
index 5c20cc6..5c20cc6 100644
--- a/build/flags/missing-var-decls.c
+++ b/build/flags/Wmissing-var-decls.c
diff --git a/build/flags/Wshadow.c b/build/flags/Wshadow.c
new file mode 100644
index 0000000..28f6ef3
--- /dev/null
+++ b/build/flags/Wshadow.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -Wshadow
+/// -Werror
+
+int main(void) {
+	return 0;
+}
diff --git a/build/flags/Wsign-compare.c b/build/flags/Wsign-compare.c
new file mode 100644
index 0000000..f083083
--- /dev/null
+++ b/build/flags/Wsign-compare.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -Wsign-compare
+/// -Werror
+
+int main(void) {
+	return 0;
+}
diff --git a/build/flags/Wstrict-prototypes.c b/build/flags/Wstrict-prototypes.c
new file mode 100644
index 0000000..9614bee
--- /dev/null
+++ b/build/flags/Wstrict-prototypes.c
@@ -0,0 +1,9 @@
+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+/// _CFLAGS += -Wstrict-prototypes
+/// -Werror
+
+int main(void) {
+	return 0;
+}