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authorSlávek Banko <slavek.banko@axis.cz>2022-01-28 01:26:57 +0100
committerSlávek Banko <slavek.banko@axis.cz>2022-01-28 09:32:33 +0100
commitb9fb6ca397bdded4d891b42eccb09f37279761a5 (patch)
treebecbca4c21913cf5e1019db670e1677b2842d2ec
parent133b3127ab69b497f2b1cfe9ac2386e6dd24288d (diff)
downloadadmin-b9fb6ca397bdded4d891b42eccb09f37279761a5.tar.gz
admin-b9fb6ca397bdded4d891b42eccb09f37279761a5.zip
Add TDE_CXX_COMPILE_STDCXX macro to check and enforce C++ standard.
The macro is a simplified form of AX_CXX_COMPILE_STDCXX from autoconf. To verify the C++ standard supported by the compiler, only the value of the __cplusplus constant defined by the compiler is checked, instead of testing examples of using individual C++ features. Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
-rw-r--r--acinclude.m4.in212
1 files changed, 212 insertions, 0 deletions
diff --git a/acinclude.m4.in b/acinclude.m4.in
index d5c64c7..d5e9008 100644
--- a/acinclude.m4.in
+++ b/acinclude.m4.in
@@ -6451,3 +6451,215 @@ EOF
AC_SUBST(LIBSQLITE3)
fi
])
+# ===========================================================================
+#
+# SYNOPSIS
+#
+# TDE_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
+#
+# DESCRIPTION
+#
+# Check for baseline language coverage in the compiler for the specified
+# version of the C++ standard. If necessary, add switches to CXX and
+# CXXCPP to enable support. VERSION may be '11' (for the C++11 standard)
+# or '14' (for the C++14 standard).
+#
+# The second argument, if specified, indicates whether you insist on an
+# extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
+# -std=c++11). If neither is specified, you get whatever works, with
+# preference for no added switch, and then for an extended mode.
+#
+# The third argument, if specified 'mandatory' or if left unspecified,
+# indicates that baseline support for the specified C++ standard is
+# required and that the macro should error out if no mode with that
+# support is found. If specified 'optional', then configuration proceeds
+# regardless, after defining HAVE_CXX${VERSION} if and only if a
+# supporting mode is found.
+#
+# LICENSE
+#
+# Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
+# Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
+# Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
+# Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
+# Copyright (c) 2015 Paul Norman <penorman@mac.com>
+# Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
+# Copyright (c) 2016, 2018 Krzesimir Nowak <qdlacz@gmail.com>
+# Copyright (c) 2019 Enji Cooper <yaneurabeya@gmail.com>
+# Copyright (c) 2020 Jason Merrill <jason@redhat.com>
+# Copyright (c) 2021 Slávek Banko <slavek.banko@axis.cz>
+#
+# 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.
+
+dnl This macro is simplified version of the macro AX_CXX_COMPILE_STDCXX
+
+AC_DEFUN([TDE_CXX_COMPILE_STDCXX], [dnl
+ m4_if([$1], [11], [tde_cxx_compile_alternatives="11 0x"],
+ [$1], [14], [tde_cxx_compile_alternatives="14 1y"],
+ [$1], [17], [tde_cxx_compile_alternatives="17 1z"],
+ [m4_fatal([invalid first argument `$1' to TDE_CXX_COMPILE_STDCXX])])dnl
+ m4_if([$2], [], [],
+ [$2], [ext], [],
+ [$2], [noext], [],
+ [m4_fatal([invalid second argument `$2' to TDE_CXX_COMPILE_STDCXX])])dnl
+ m4_if([$3], [], [tde_cxx_compile_cxx$1_required=true],
+ [$3], [mandatory], [tde_cxx_compile_cxx$1_required=true],
+ [$3], [optional], [tde_cxx_compile_cxx$1_required=false],
+ [m4_fatal([invalid third argument `$3' to TDE_CXX_COMPILE_STDCXX])])
+ AC_LANG_PUSH([C++])dnl
+ ac_success=no
+
+ m4_if([$2], [], [dnl
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
+ tde_cv_cxx_compile_cxx$1,
+ [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_TDE_CXX_COMPILE_STDCXX_testbody_$1])],
+ [tde_cv_cxx_compile_cxx$1=yes],
+ [tde_cv_cxx_compile_cxx$1=no])])
+ if test x$tde_cv_cxx_compile_cxx$1 = xyes; then
+ ac_success=yes
+ fi])
+
+ m4_if([$2], [noext], [], [dnl
+ if test x$ac_success = xno; then
+ for alternative in ${tde_cxx_compile_alternatives}; do
+ switch="-std=gnu++${alternative}"
+ cachevar=AS_TR_SH([tde_cv_cxx_compile_cxx$1_$switch])
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+ $cachevar,
+ [ac_save_CXX="$CXX"
+ CXX="$CXX $switch"
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_TDE_CXX_COMPILE_STDCXX_testbody_$1])],
+ [eval $cachevar=yes],
+ [eval $cachevar=no])
+ CXX="$ac_save_CXX"])
+ if eval test x\$$cachevar = xyes; then
+ CXX="$CXX $switch"
+ if test -n "$CXXCPP" ; then
+ CXXCPP="$CXXCPP $switch"
+ fi
+ ac_success=yes
+ break
+ fi
+ done
+ fi])
+
+ m4_if([$2], [ext], [], [dnl
+ if test x$ac_success = xno; then
+ dnl HP's aCC needs +std=c++11 according to:
+ dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
+ dnl Cray's crayCC needs "-h std=c++11"
+ for alternative in ${tde_cxx_compile_alternatives}; do
+ for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
+ cachevar=AS_TR_SH([tde_cv_cxx_compile_cxx$1_$switch])
+ AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
+ $cachevar,
+ [ac_save_CXX="$CXX"
+ CXX="$CXX $switch"
+ AC_COMPILE_IFELSE([AC_LANG_SOURCE([_TDE_CXX_COMPILE_STDCXX_testbody_$1])],
+ [eval $cachevar=yes],
+ [eval $cachevar=no])
+ CXX="$ac_save_CXX"])
+ if eval test x\$$cachevar = xyes; then
+ CXX="$CXX $switch"
+ if test -n "$CXXCPP" ; then
+ CXXCPP="$CXXCPP $switch"
+ fi
+ ac_success=yes
+ break
+ fi
+ done
+ if test x$ac_success = xyes; then
+ break
+ fi
+ done
+ fi])
+ AC_LANG_POP([C++])
+ if test x$tde_cxx_compile_cxx$1_required = xtrue; then
+ if test x$ac_success = xno; then
+ AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
+ fi
+ fi
+ if test x$ac_success = xno; then
+ HAVE_CXX$1=0
+ AC_MSG_NOTICE([No compiler with C++$1 support was found])
+ else
+ HAVE_CXX$1=1
+ AC_DEFINE(HAVE_CXX$1,1,
+ [define if the compiler supports basic C++$1 syntax])
+ fi
+ AC_SUBST(HAVE_CXX$1)
+])
+
+
+dnl Test body for checking C++11 support
+
+m4_define([_TDE_CXX_COMPILE_STDCXX_testbody_11],
+ _TDE_CXX_COMPILE_STDCXX_testbody_new_in_11
+)
+
+
+dnl Test body for checking C++14 support
+
+m4_define([_TDE_CXX_COMPILE_STDCXX_testbody_14],
+ _TDE_CXX_COMPILE_STDCXX_testbody_new_in_11
+ _TDE_CXX_COMPILE_STDCXX_testbody_new_in_14
+)
+
+m4_define([_TDE_CXX_COMPILE_STDCXX_testbody_17],
+ _TDE_CXX_COMPILE_STDCXX_testbody_new_in_11
+ _TDE_CXX_COMPILE_STDCXX_testbody_new_in_14
+ _TDE_CXX_COMPILE_STDCXX_testbody_new_in_17
+)
+
+dnl Tests for new features in C++11
+
+m4_define([_TDE_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201103L
+
+#error "This is not a C++11 compiler"
+
+#endif // __cplusplus >= 201103L
+
+]])
+
+
+dnl Tests for new features in C++14
+
+m4_define([_TDE_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201402L
+
+#error "This is not a C++14 compiler"
+
+#endif // __cplusplus >= 201402L
+
+]])
+
+
+dnl Tests for new features in C++17
+
+m4_define([_TDE_CXX_COMPILE_STDCXX_testbody_new_in_17], [[
+
+#ifndef __cplusplus
+
+#error "This is not a C++ compiler"
+
+#elif __cplusplus < 201703L
+
+#error "This is not a C++17 compiler"
+
+#endif // __cplusplus >= 201703L
+
+]])