134 lines
4.7 KiB
Plaintext
134 lines
4.7 KiB
Plaintext
|
# ============================================================================
|
||
|
|
# http://www.gnu.org/software/autoconf-archive/ax_compiler_flags_cflags.html
|
||
|
|
# ============================================================================
|
||
|
|
#
|
||
|
|
# SYNOPSIS
|
||
|
|
#
|
||
|
|
# AX_COMPILER_FLAGS_CFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS])
|
||
|
|
#
|
||
|
|
# DESCRIPTION
|
||
|
|
#
|
||
|
|
# Add warning flags for the C compiler to VARIABLE, which defaults to
|
||
|
|
# WARN_CFLAGS. VARIABLE is AC_SUBST-ed by this macro, but must be
|
||
|
|
# manually added to the CFLAGS variable for each target in the code base.
|
||
|
|
#
|
||
|
|
# This macro depends on the environment set up by AX_COMPILER_FLAGS.
|
||
|
|
# Specifically, it uses the value of $ax_enable_compile_warnings to decide
|
||
|
|
# which flags to enable.
|
||
|
|
#
|
||
|
|
# LICENSE
|
||
|
|
#
|
||
|
|
# Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk>
|
||
|
|
#
|
||
|
|
# Copying and distribution of this file, with or without modification, are
|
||
|
|
# permitted in any medium without royalty provided the copyright notice
|
||
|
|
# and this notice are preserved. This file is offered as-is, without any
|
||
|
|
# warranty.
|
||
|
|
|
||
|
|
#serial 11
|
||
|
|
|
||
|
|
AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[
|
||
|
|
AC_REQUIRE([AC_PROG_SED])
|
||
|
|
AX_REQUIRE_DEFINED([AX_APPEND_COMPILE_FLAGS])
|
||
|
|
AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
|
||
|
|
AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
|
||
|
|
|
||
|
|
# Variable names
|
||
|
|
m4_define(ax_warn_cflags_variable,
|
||
|
|
[m4_normalize(ifelse([$1],,[WARN_CFLAGS],[$1]))])
|
||
|
|
|
||
|
|
AC_LANG_PUSH([C])
|
||
|
|
|
||
|
|
# Always pass -Werror=unknown-warning-option to get Clang to fail on bad
|
||
|
|
# flags, otherwise they are always appended to the warn_cflags variable, and
|
||
|
|
# Clang warns on them for every compilation unit.
|
||
|
|
# If this is passed to GCC, it will explode, so the flag must be enabled
|
||
|
|
# conditionally.
|
||
|
|
AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
|
||
|
|
ax_compiler_flags_test="-Werror=unknown-warning-option"
|
||
|
|
],[
|
||
|
|
ax_compiler_flags_test=""
|
||
|
|
])
|
||
|
|
|
||
|
|
# Base flags
|
||
|
|
AX_APPEND_COMPILE_FLAGS([ dnl
|
||
|
|
-fno-strict-aliasing dnl
|
||
|
|
$3 dnl
|
||
|
|
],ax_warn_cflags_variable,[$ax_compiler_flags_test])
|
||
|
|
|
||
|
|
AS_IF([test "$ax_enable_compile_warnings" != "no"],[
|
||
|
|
# "yes" flags
|
||
|
|
AX_APPEND_COMPILE_FLAGS([ dnl
|
||
|
|
-Wall dnl
|
||
|
|
-Wextra dnl
|
||
|
|
-Wundef dnl
|
||
|
|
-Wnested-externs dnl
|
||
|
|
-Wwrite-strings dnl
|
||
|
|
-Wpointer-arith dnl
|
||
|
|
-Wmissing-declarations dnl
|
||
|
|
-Wmissing-prototypes dnl
|
||
|
|
-Wstrict-prototypes dnl
|
||
|
|
-Wredundant-decls dnl
|
||
|
|
-Wno-unused-parameter dnl
|
||
|
|
-Wno-missing-field-initializers dnl
|
||
|
|
-Wdeclaration-after-statement dnl
|
||
|
|
-Wformat=2 dnl
|
||
|
|
-Wold-style-definition dnl
|
||
|
|
-Wcast-align dnl
|
||
|
|
-Wformat-nonliteral dnl
|
||
|
|
-Wformat-security dnl
|
||
|
|
-Wsign-compare dnl
|
||
|
|
-Wstrict-aliasing dnl
|
||
|
|
-Wshadow dnl
|
||
|
|
-Winline dnl
|
||
|
|
-Wpacked dnl
|
||
|
|
-Wmissing-format-attribute dnl
|
||
|
|
-Wmissing-noreturn dnl
|
||
|
|
-Winit-self dnl
|
||
|
|
-Wredundant-decls dnl
|
||
|
|
-Wmissing-include-dirs dnl
|
||
|
|
-Wunused-but-set-variable dnl
|
||
|
|
-Warray-bounds dnl
|
||
|
|
-Wimplicit-function-declaration dnl
|
||
|
|
-Wreturn-type dnl
|
||
|
|
-Wswitch-enum dnl
|
||
|
|
-Wswitch-default dnl
|
||
|
|
$4 dnl
|
||
|
|
$5 dnl
|
||
|
|
$6 dnl
|
||
|
|
$7 dnl
|
||
|
|
],ax_warn_cflags_variable,[$ax_compiler_flags_test])
|
||
|
|
])
|
||
|
|
AS_IF([test "$ax_enable_compile_warnings" = "error"],[
|
||
|
|
# "error" flags; -Werror has to be appended unconditionally because
|
||
|
|
# it's not possible to test for
|
||
|
|
#
|
||
|
|
# suggest-attribute=format is disabled because it gives too many false
|
||
|
|
# positives
|
||
|
|
AX_APPEND_FLAG([-Werror],ax_warn_cflags_variable)
|
||
|
|
|
||
|
|
AX_APPEND_COMPILE_FLAGS([ dnl
|
||
|
|
-Wno-suggest-attribute=format dnl
|
||
|
|
],ax_warn_cflags_variable,[$ax_compiler_flags_test])
|
||
|
|
])
|
||
|
|
|
||
|
|
# In the flags below, when disabling specific flags, always add *both*
|
||
|
|
# -Wno-foo and -Wno-error=foo. This fixes the situation where (for example)
|
||
|
|
# we enable -Werror, disable a flag, and a build bot passes CFLAGS=-Wall,
|
||
|
|
# which effectively turns that flag back on again as an error.
|
||
|
|
for flag in $ax_warn_cflags_variable; do
|
||
|
|
AS_CASE([$flag],
|
||
|
|
[-Wno-*=*],[],
|
||
|
|
[-Wno-*],[
|
||
|
|
AX_APPEND_COMPILE_FLAGS([-Wno-error=$(AS_ECHO([$flag]) | $SED 's/^-Wno-//')],
|
||
|
|
ax_warn_cflags_variable,
|
||
|
|
[$ax_compiler_flags_test])
|
||
|
|
])
|
||
|
|
done
|
||
|
|
|
||
|
|
AC_LANG_POP([C])
|
||
|
|
|
||
|
|
# Substitute the variables
|
||
|
|
AC_SUBST(ax_warn_cflags_variable)
|
||
|
|
])dnl AX_COMPILER_FLAGS
|