diff options
| author | Reini Urban <rurban@cpan.org> | 2018-01-15 11:08:18 +0100 |
|---|---|---|
| committer | Reini Urban <rurban@cpan.org> | 2018-01-15 11:10:11 +0100 |
| commit | e851effafc2026bbf3fdfa3031d0ab723ae0ff53 (patch) | |
| tree | fede49f394b12f92f6ca6f3897da98d55ef9d91d /m4/ax_compiler_flags_cflags.m4 | |
| parent | 3546625f64904062a5c413ac9f08f0a9901427fd (diff) | |
| download | autoconf-archive-e851effafc2026bbf3fdfa3031d0ab723ae0ff53.tar.gz | |
ax_compiler_flags_cflags: c++ fixes
Several warning flags are incompatible with c++:
-Wnested-externs -Wmissing-prototypes -Wstrict-prototypes -Wdeclaration-after-statement
-Wold-style-definition -Wimplicit-function-declaration -Wjump-misses-init
Diffstat (limited to 'm4/ax_compiler_flags_cflags.m4')
| -rw-r--r-- | m4/ax_compiler_flags_cflags.m4 | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/m4/ax_compiler_flags_cflags.m4 b/m4/ax_compiler_flags_cflags.m4 index 9767e6a..44d2882 100644 --- a/m4/ax_compiler_flags_cflags.m4 +++ b/m4/ax_compiler_flags_cflags.m4 @@ -19,14 +19,14 @@ # LICENSE # # Copyright (c) 2014, 2015 Philip Withnall <philip@tecnocode.co.uk> -# Copyright (c) 2017 Reini Urban <rurban@cpan.org> +# 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. -#serial 15 +#serial 16 AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[ AC_REQUIRE([AC_PROG_SED]) @@ -40,6 +40,13 @@ AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[ AC_LANG_PUSH([C]) + 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. @@ -70,18 +77,13 @@ AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[ -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 @@ -97,7 +99,6 @@ AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[ -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 @@ -106,13 +107,24 @@ AC_DEFUN([AX_COMPILER_FLAGS_CFLAGS],[ -Wlogical-op dnl -Wrestrict dnl -Wnull-dereference dnl - -Wjump-misses-init dnl -Wdouble-promotion dnl $4 dnl $5 dnl $6 dnl $7 dnl ],ax_warn_cflags_variable,[$ax_compiler_flags_test]) + if test "$ax_compiler_cxx" = "no" ; then + # C-only flags. Warn in C++ + AX_APPEND_COMPILE_FLAGS([ dnl + -Wnested-externs dnl + -Wmissing-prototypes dnl + -Wstrict-prototypes dnl + -Wdeclaration-after-statement dnl + -Wimplicit-function-declaration dnl + -Wold-style-definition dnl + -Wjump-misses-init dnl + ],ax_warn_cflags_variable,[$ax_compiler_flags_test]) + fi ]) AS_IF([test "$ax_enable_compile_warnings" = "error"],[ # "error" flags; -Werror has to be appended unconditionally because |