# # This file has been modified to better fit with the needs of GAP, # and as such deviates from the original version described below. # # ============================================================================= # https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_cflags.html # ============================================================================= # # SYNOPSIS # # AX_COMPILER_WARNING_FLAGS # # DESCRIPTION # # Add warning flags for the C compiler to WARN_CFLAGS, and for the C++ # compiler in WARN_CXXFLAGS. Both variables are AC_SUBST-ed by this macro, # but must be manually added to the CFLAGS respectively CXXFLAGS variables # 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 $ax_enable_compile_warnings to decide # which flags to enable. # # LICENSE # # Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk> # Copyright (c) 2017, 2018 Reini Urban <rurban@cpan.org> # # Copying and distribution of this file, with or without modification, are # permitted in any medium without royalty provided the copyright notice # and this notice are preserved. This file is offered as-is, without any # warranty.
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
[#ifndef __cplusplus #error "no C++" #endif]])],
[ax_compiler_cxx=yes;],
[ax_compiler_cxx=no;])
# Always pass -Werror=unknown-warning-option to get Clang to fail on bad # flags, otherwise they are always appended to the warn_cflags variable, and # Clang warns on them for every compilation unit. # If this is passed to GCC, it will explode, so the flag must be enabled # conditionally.
AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],[
ax_compiler_flags_test="-Werror=unknown-warning-option"
],[
ax_compiler_flags_test=""
])
# Check that -Wno-suggest-attribute=format is supported
AX_CHECK_COMPILE_FLAG([-Wno-suggest-attribute=format],[
ax_compiler_no_suggest_attribute_flags="-Wno-suggest-attribute=format"
],[
ax_compiler_no_suggest_attribute_flags=""
])
# Base flags
AX_APPEND_COMPILE_FLAGS([ dnl
-fno-strict-aliasing dnl
],ax_warn_cflags_variable,[$ax_compiler_flags_test])
AS_IF([test "$ax_enable_compile_warnings" != "no"],[ # "yes" flags
AX_APPEND_COMPILE_FLAGS([ dnl
-Wall dnl
-Wextra dnl
-Warray-bounds dnl
dnl -Wcast-align dnl
-Wno-cast-function-type dnl # GCC otherwise warns about ObjFunc casts in GVAR_FUNC
-Wdouble-promotion dnl
-Wduplicated-branches dnl
-Wduplicated-cond dnl
-Wformat-nonliteral dnl
-Wformat-security dnl
-Wformat=2 dnl
-Winit-self dnl
-Wno-inline dnl # lots of warnings with GCC on Linux
-Wlogical-op dnl
dnl -Wmissing-declarations dnl
-Wmissing-field-initializers dnl
-Wmissing-format-attribute dnl
-Wmissing-include-dirs dnl
dnl -Wmissing-noreturn dnl
-Wno-pragmas dnl # for GCC and the ObjFunc typedef
dnl -Wnull-dereference dnl
-Wpacked dnl
-Wpointer-arith dnl
-Wredundant-decls dnl
-Wredundant-decls dnl
-Wrestrict dnl
-Wreturn-type dnl
-Wshadow dnl
-Wno-sign-compare dnl # disabled: too many places trigger this
-Wstrict-aliasing dnl
dnl -Wstrict-prototypes dnl # disabled because GCC does not support it for C code (clang does)
dnl -Wswitch-default dnl
dnl -Wswitch-enum dnl
-Wundef dnl
-Wunused-but-set-variable dnl
-Wno-unused-parameter dnl # disabled: too many places trigger this
-Wwrite-strings dnl
],ax_warn_cflags_variable,[$ax_compiler_flags_test])
# HACK: use the warning flags determined so far also for the C++ compiler. # This assumes that the C and C++ compiler are "related" and thus will # accept similar warnings flags.
AS_VAR_SET(ax_warn_cxxflags_variable,[$ax_warn_cflags_variable])
# Test for warnings that only work in C, not in C++ if test "$ax_compiler_cxx" = "no" ; then
AX_APPEND_COMPILE_FLAGS([ dnl
dnl -Wdeclaration-after-statement dnl
-Wno-implicit-fallthrough dnl
-Wimplicit-function-declaration dnl
-Wjump-misses-init dnl
dnl -Wmissing-prototypes dnl
-Wnested-externs dnl
-Wold-style-definition dnl
-Wstrict-prototypes dnl
-Wmissing-variable-declarations dnl
],ax_warn_cflags_variable,[$ax_compiler_flags_test]) fi
# Test for warnings that only work in C++, not in C
AC_LANG_PUSH([C++])
AX_APPEND_COMPILE_FLAGS([ dnl
-Wextra-semi dnl
],ax_warn_cxxflags_variable,[$ax_compiler_flags_test])
AC_LANG_POP([C++])
])
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_FLAG([-Werror],ax_warn_cxxflags_variable)
# 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)
AC_SUBST(ax_warn_cxxflags_variable)
])dnl AX_COMPILER_FLAGS
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