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-rw-r--r--build/flags.mk107
1 files changed, 43 insertions, 64 deletions
diff --git a/build/flags.mk b/build/flags.mk
index fa793b8..c50b077 100644
--- a/build/flags.mk
+++ b/build/flags.mk
@@ -6,28 +6,8 @@
include build/prelude.mk
include gen/vars.mk
-# Configurable flags
-CPPFLAGS ?=
-CFLAGS ?= \
- -g \
- -Wall \
- -Wformat=2 \
- -Werror=implicit \
- -Wimplicit-fallthrough \
- -Wmissing-declarations \
- -Wshadow \
- -Wsign-compare \
- -Wstrict-prototypes
-LDFLAGS ?=
-LDLIBS ?=
-
-export XCPPFLAGS=${CPPFLAGS}
-export XCFLAGS=${CFLAGS}
-export XLDFLAGS=${LDFLAGS}
-export XLDLIBS=${LDLIBS}
-
-# Immutable flags
-export BFS_CPPFLAGS= \
+# Internal flags
+_CPPFLAGS := \
-Isrc \
-Igen \
-D__EXTENSIONS__ \
@@ -39,14 +19,17 @@ export BFS_CPPFLAGS= \
-D_POSIX_PTHREAD_SEMANTICS \
-D_FILE_OFFSET_BITS=64 \
-D_TIME_BITS=64
-export BFS_CFLAGS= -std=c17 -pthread
+
+_CFLAGS := -std=c17 -pthread
+_LDFLAGS :=
+_LDLIBS :=
# Platform-specific system libraries
LDLIBS,DragonFly := -lposix1e
LDLIBS,Linux := -lrt
LDLIBS,NetBSD := -lutil
LDLIBS,SunOS := -lsec -lsocket -lnsl
-export BFS_LDLIBS=${LDLIBS,${OS}}
+_LDLIBS += ${LDLIBS,${OS}}
# Build profiles
_ASAN := ${TRUTHY,${ASAN}}
@@ -60,7 +43,7 @@ _RELEASE := ${TRUTHY,${RELEASE}}
# https://github.com/google/sanitizers/issues/342
TSAN_CPPFLAGS,y := -DBFS_USE_TARGET_CLONES=0
-export TSAN_CPPFLAGS=${TSAN_CPPFLAGS,${_TSAN}}
+_CPPFLAGS += ${TSAN_CPPFLAGS,${_TSAN}}
ASAN_CFLAGS,y := -fsanitize=address
LSAN_CFLAGS,y := -fsanitize=leak
@@ -68,69 +51,65 @@ MSAN_CFLAGS,y := -fsanitize=memory -fsanitize-memory-track-origins
TSAN_CFLAGS,y := -fsanitize=thread
UBSAN_CFLAGS,y := -fsanitize=undefined
-export ASAN_CFLAGS=${ASAN_CFLAGS,${_ASAN}}
-export LSAN_CFLAGS=${LSAN_CFLAGS,${_LSAN}}
-export MSAN_CFLAGS=${MSAN_CFLAGS,${_MSAN}}
-export TSAN_CFLAGS=${TSAN_CFLAGS,${_TSAN}}
-export UBSAN_CFLAGS=${UBSAN_CFLAGS,${_UBSAN}}
+_CFLAGS += ${ASAN_CFLAGS,${_ASAN}}
+_CFLAGS += ${LSAN_CFLAGS,${_LSAN}}
+_CFLAGS += ${MSAN_CFLAGS,${_MSAN}}
+_CFLAGS += ${TSAN_CFLAGS,${_TSAN}}
+_CFLAGS += ${UBSAN_CFLAGS,${_UBSAN}}
SAN_CFLAGS,y := -fno-sanitize-recover=all
INSANE := ${NOT,${_ASAN}${_LSAN}${_MSAN}${_TSAN}${_UBSAN}}
SAN := ${NOT,${INSANE}}
-export SAN_CFLAGS=${SAN_CFLAGS,${SAN}}
+_CFLAGS += ${SAN_CFLAGS,${SAN}}
# MSAN and TSAN both need all code to be instrumented
YESLIBS := ${NOT,${_MSAN}${_TSAN}}
NOLIBS ?= ${NOT,${YESLIBS}}
-export XNOLIBS=${NOLIBS}
# gcov only intercepts fork()/exec() with -std=gnu*
GCOV_CFLAGS,y := -std=gnu17 --coverage
-export GCOV_CFLAGS=${GCOV_CFLAGS,${_GCOV}}
+_CFLAGS += ${GCOV_CFLAGS,${_GCOV}}
LINT_CPPFLAGS,y := -D_FORTIFY_SOURCE=3 -DBFS_LINT
LINT_CFLAGS,y := -Werror -O2
-export LINT_CPPFLAGS=${LINT_CPPFLAGS,${_LINT}}
-export LINT_CFLAGS=${LINT_CFLAGS,${_LINT}}
+_CPPFLAGS += ${LINT_CPPFLAGS,${_LINT}}
+_CFLAGS += ${LINT_CFLAGS,${_LINT}}
RELEASE_CPPFLAGS,y := -DNDEBUG
RELEASE_CFLAGS,y := -O3 -flto=auto
-export RELEASE_CPPFLAGS=${RELEASE_CPPFLAGS,${_RELEASE}}
-export RELEASE_CFLAGS=${RELEASE_CFLAGS,${_RELEASE}}
+_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
-# Set a variable
-SETVAR = @printf '%s := %s\n' >>$@
+# Add the configurable flags last so they can override ours
+_CPPFLAGS += ${CPPFLAGS} ${EXTRA_CPPFLAGS}
+_CFLAGS += ${CFLAGS} ${EXTRA_CFLAGS}
+_LDFLAGS += ${LDFLAGS} ${EXTRA_LDFLAGS}
+# (except LDLIBS, as earlier libs override later ones)
+_LDLIBS := ${LDLIBS} ${EXTRA_LDLIBS} ${_LDLIBS}
-# Append to a variable, if non-empty
-APPEND = @append() { test -z "$$2" || printf '%s += %s\n' "$$1" "$$2" >>$@; }; append
+include build/exports.mk
gen/flags.mk::
${MSG} "[ GEN] $@"
@printf '# %s\n' "$@" >$@
- ${SETVAR} _CPPFLAGS "$$BFS_CPPFLAGS"
- ${APPEND} _CPPFLAGS "$$TSAN_CPPFLAGS"
- ${APPEND} _CPPFLAGS "$$LINT_CPPFLAGS"
- ${APPEND} _CPPFLAGS "$$RELEASE_CPPFLAGS"
- ${APPEND} _CPPFLAGS "$$XCPPFLAGS"
- ${APPEND} _CPPFLAGS "$$EXTRA_CPPFLAGS"
- ${SETVAR} _CFLAGS "$$BFS_CFLAGS"
- ${APPEND} _CFLAGS "$$ASAN_CFLAGS"
- ${APPEND} _CFLAGS "$$LSAN_CFLAGS"
- ${APPEND} _CFLAGS "$$MSAN_CFLAGS"
- ${APPEND} _CFLAGS "$$TSAN_CFLAGS"
- ${APPEND} _CFLAGS "$$UBSAN_CFLAGS"
- ${APPEND} _CFLAGS "$$SAN_CFLAGS"
- ${APPEND} _CFLAGS "$$GCOV_CFLAGS"
- ${APPEND} _CFLAGS "$$LINT_CFLAGS"
- ${APPEND} _CFLAGS "$$RELEASE_CFLAGS"
- ${APPEND} _CFLAGS "$$XCFLAGS"
- ${APPEND} _CFLAGS "$$EXTRA_CFLAGS"
- ${SETVAR} _LDFLAGS "$$XLDFLAGS"
- ${SETVAR} _LDLIBS "$$XLDLIBS"
- ${APPEND} _LDLIBS "$$EXTRA_LDLIBS"
- ${APPEND} _LDLIBS "$$BFS_LDLIBS"
- ${SETVAR} NOLIBS "$$XNOLIBS"
+ @printf '_CPPFLAGS := %s\n' "$$XCPPFLAGS" >>$@
+ @printf '_CFLAGS := %s\n' "$$XCFLAGS" >>$@
+ @printf '_LDFLAGS := %s\n' "$$XLDFLAGS" >>$@
+ @printf '_LDLIBS := %s\n' "$$XLDLIBS" >>$@
+ @printf 'NOLIBS := %s\n' "$$XNOLIBS" >>$@
@test "${OS}-${SAN}" != FreeBSD-y || printf 'POSTLINK = elfctl -e +noaslr $$@\n' >>$@
${VCAT} $@