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WIP add fmtlib for secure printf/scanf, C++
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| [submodule "fmt"] | ||
| path = fmt | ||
| url = https://github.com/rurban/fmt |
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| # =============================================================================== | ||
| # https://www.gnu.org/software/autoconf-archive/ax_compiler_flags_cxxflags.html | ||
| # =============================================================================== | ||
| # | ||
| # SYNOPSIS | ||
| # | ||
| # AX_COMPILER_FLAGS_CXXFLAGS([VARIABLE], [IS-RELEASE], [EXTRA-BASE-FLAGS], [EXTRA-YES-FLAGS]) | ||
| # | ||
| # DESCRIPTION | ||
| # | ||
| # Add warning flags for the C++ compiler to VARIABLE, which defaults to | ||
| # WARN_CXXFLAGS. VARIABLE is AC_SUBST-ed by this macro, but must be | ||
| # manually added to the CXXFLAGS 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) 2015 David King <amigadave@amigadave.com> | ||
| # | ||
| # 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 10 | ||
|
|
||
| AC_DEFUN([AX_COMPILER_FLAGS_CXXFLAGS],[ | ||
| 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_cxxflags_variable], | ||
| [m4_normalize(ifelse([$1],,[WARN_CXXFLAGS],[$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_cxxflags 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 | ||
| $3 dnl | ||
| ],ax_warn_cxxflags_variable,[$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 | ||
| -Wwrite-strings dnl | ||
| -Wpointer-arith dnl | ||
| -Wmissing-declarations dnl | ||
| -Wredundant-decls dnl | ||
| -Wno-unused-parameter dnl | ||
| -Wno-missing-field-initializers dnl | ||
| -Wformat=2 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 | ||
| -Wreturn-type dnl | ||
| -Wno-overloaded-virtual dnl | ||
| -Wswitch-enum dnl | ||
| -Wswitch-default dnl | ||
| $4 dnl | ||
| $5 dnl | ||
| $6 dnl | ||
| $7 dnl | ||
| ],ax_warn_cxxflags_variable,[$ax_compiler_flags_test]) | ||
| ]) | ||
| AS_IF([test "$ax_enable_compile_warnings" = "error"],[ | ||
| # "error" flags; -Werror has to be appended unconditionally because | ||
| # it's not possible to test for | ||
| # | ||
| # suggest-attribute=format is disabled because it gives too many false | ||
| # positives | ||
| AX_APPEND_FLAG([-Werror],ax_warn_cxxflags_variable) | ||
| AX_APPEND_COMPILE_FLAGS([ dnl | ||
| [$ax_compiler_no_suggest_attribute_flags] dnl | ||
| ],ax_warn_cxxflags_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 CXXFLAGS=-Wall, | ||
| # which effectively turns that flag back on again as an error. | ||
| for flag in $ax_warn_cxxflags_variable; do | ||
| AS_CASE([$flag], | ||
| [-Wno-*=*],[], | ||
| [-Wno-*],[ | ||
| AX_APPEND_COMPILE_FLAGS([-Wno-error=$(AS_ECHO([$flag]) | $SED 's/^-Wno-//')], | ||
| ax_warn_cxxflags_variable, | ||
| [$ax_compiler_flags_test]) | ||
| ]) | ||
| done | ||
| AC_LANG_POP([C++]) | ||
| # Substitute the variables | ||
| AC_SUBST(ax_warn_cxxflags_variable) | ||
| ])dnl AX_COMPILER_FLAGS_CXXFLAGS |