ifndef COMPILER_FEATURES
COMPILER_FEATURES := $(shell ./detect-compiler $(CC))
endif

ifeq ($(filter no-error,$(DEVOPTS)),)
DEVELOPER_CFLAGS += -Werror
SPARSE_FLAGS += -Wsparse-error
endif

DEVELOPER_CFLAGS += -Wall
ifeq ($(filter no-pedantic,$(DEVOPTS)),)
DEVELOPER_CFLAGS += -pedantic
ifneq ($(or $(filter gcc5,$(COMPILER_FEATURES)),$(filter clang4,$(COMPILER_FEATURES))),)
DEVELOPER_CFLAGS += -Wpedantic
ifneq ($(filter gcc10,$(COMPILER_FEATURES)),)
ifeq ($(uname_S),MINGW)
DEVELOPER_CFLAGS += -Wno-pedantic-ms-format
endif
endif
endif
endif

ifneq ($(uname_S),FreeBSD)
ifneq ($(or $(filter gcc6,$(COMPILER_FEATURES)),$(filter clang7,$(COMPILER_FEATURES))),)
DEVELOPER_CFLAGS += -std=gnu99
endif
else
# FreeBSD cannot limit to C99 because its system headers unconditionally
# rely on C11 features.
endif

DEVELOPER_CFLAGS += -Wdeclaration-after-statement
DEVELOPER_CFLAGS += -Wformat-security
DEVELOPER_CFLAGS += -Wold-style-definition
DEVELOPER_CFLAGS += -Woverflow
DEVELOPER_CFLAGS += -Wpointer-arith
DEVELOPER_CFLAGS += -Wstrict-prototypes
DEVELOPER_CFLAGS += -Wunused
DEVELOPER_CFLAGS += -Wvla
DEVELOPER_CFLAGS += -Wwrite-strings
DEVELOPER_CFLAGS += -fno-common

ifneq ($(filter clang4,$(COMPILER_FEATURES)),)
DEVELOPER_CFLAGS += -Wtautological-constant-out-of-range-compare
endif

ifneq ($(or $(filter gcc6,$(COMPILER_FEATURES)),$(filter clang4,$(COMPILER_FEATURES))),)
DEVELOPER_CFLAGS += -Wextra
# if a function is public, there should be a prototype and the right
# header file should be included. If not, it should be static.
DEVELOPER_CFLAGS += -Wmissing-prototypes
ifeq ($(filter extra-all,$(DEVOPTS)),)
# These are disabled because we have these all over the place.
DEVELOPER_CFLAGS += -Wno-empty-body
DEVELOPER_CFLAGS += -Wno-missing-field-initializers
endif
endif

# uninitialized warnings on gcc 4.9.2 in xdiff/xdiffi.c and config.c
# not worth fixing since newer compilers correctly stop complaining
#
# Likewise, gcc older than 4.9 complains about initializing a
# struct-within-a-struct using just "{ 0 }"
ifneq ($(filter gcc4,$(COMPILER_FEATURES)),)
ifeq ($(filter gcc5,$(COMPILER_FEATURES)),)
DEVELOPER_CFLAGS += -Wno-uninitialized
DEVELOPER_CFLAGS += -Wno-missing-braces
endif
endif

# Old versions of clang complain about initializing a
# struct-within-a-struct using just "{0}" rather than "{{0}}".  This
# error is considered a false-positive and not worth fixing, because
# new clang versions do not, so just disable it.
#
# The "bug" was fixed in upstream clang 9.
#
# Complicating this is that versions of clang released by Apple have
# their own version numbers (associated with the corresponding version
# of XCode) unrelated to the official clang version numbers.
#
# The bug was fixed in Apple clang 12.
#
ifneq ($(filter clang1,$(COMPILER_FEATURES)),)     # if we are using clang
ifeq ($(uname_S),Darwin)                           # if we are on darwin
ifeq ($(filter clang12,$(COMPILER_FEATURES)),)     # if version < 12
DEVELOPER_CFLAGS += -Wno-missing-braces
endif
else                                               # not darwin
ifeq ($(filter clang9,$(COMPILER_FEATURES)),)      # if version < 9
DEVELOPER_CFLAGS += -Wno-missing-braces
endif
endif
endif

# https://bugzilla.redhat.com/show_bug.cgi?id=2075786
ifneq ($(filter gcc12,$(COMPILER_FEATURES)),)
DEVELOPER_CFLAGS += -Wno-error=stringop-overread
endif

GIT_TEST_PERL_FATAL_WARNINGS = YesPlease