b4ef2e346
Denys Vlasenko
2019-10-25
Subject
Makefile.flags: suppress some clang-9 warnings
Binary
No binary (build failed)
Architecture & Compiler Flags
—
Build Log
(log yok)
Commit Diff GitHub →
Makefile.flags+22 -3
| @@ -47,12 +47,28 @@ endif | |
| # gcc 3.x emits bogus "old style proto" warning on find.c:alloc_action() | |
| CFLAGS += $(call cc-ifversion, -ge, 0400, -Wold-style-definition) | |
| - | CFLAGS += $(call cc-option,-fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections,) |
| + | ifneq ($(CC),clang) |
| + | # "clang-9: warning: optimization flag '-finline-limit=0' is not supported |
| + | CFLAGS += $(call cc-option,-finline-limit=0,) |
| + | endif |
| + | |
| + | CFLAGS += $(call cc-option,-fno-builtin-strlen -fomit-frame-pointer -ffunction-sections -fdata-sections,) |
| # -fno-guess-branch-probability: prohibit pseudo-random guessing | |
| # of branch probabilities (hopefully makes bloatcheck more stable): | |
| CFLAGS += $(call cc-option,-fno-guess-branch-probability,) | |
| - | CFLAGS += $(call cc-option,-funsigned-char -static-libgcc,) |
| - | CFLAGS += $(call cc-option,-falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1,) |
| + | CFLAGS += $(call cc-option,-funsigned-char,) |
| + | |
| + | ifneq ($(CC),clang) |
| + | # "clang-9: warning: argument unused during compilation: '-static-libgcc'" |
| + | CFLAGS += $(call cc-option,-static-libgcc,) |
| + | endif |
| + | |
| + | CFLAGS += $(call cc-option,-falign-functions=1,) |
| + | ifneq ($(CC),clang) |
| + | # "clang-9: warning: optimization flag '-falign-jumps=1' is not supported" (and same for other two) |
| + | CFLAGS += $(call cc-option,-falign-jumps=1 -falign-labels=1 -falign-loops=1,) |
| + | endif |
| + | |
| # Defeat .eh_frame bloat (gcc 4.6.3 x86-32 defconfig: 20% smaller busybox binary): | |
| CFLAGS += $(call cc-option,-fno-unwind-tables,) | |
| CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,) | |
| @@ -60,6 +76,9 @@ CFLAGS += $(call cc-option,-fno-asynchronous-unwind-tables,) | |
| # (try disabling this and comparing assembly, it's instructive) | |
| CFLAGS += $(call cc-option,-fno-builtin-printf,) | |
| + | # clang-9 does not like "str" + N and "if (CONFIG_ITEM && cond)" constructs |
| + | CFLAGS += $(call cc-option,-Wno-string-plus-int -Wno-constant-logical-operand) |
| + | |
| # FIXME: These warnings are at least partially to be concerned about and should | |
| # be fixed.. | |
| #CFLAGS += $(call cc-option,-Wconversion,) | |