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[build] fix for autoconf screwing up the c++ flags

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pull/1235/head
Tim Stack 3 months ago
parent 03a17ef226
commit 4194f12a34
2 changed files with 67 additions and 12 deletions
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3
configure.ac
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@ -29,8 +29,7 @@ AS_CASE([x$srcdir],
AC_SUBST(abssrcdir)
AC_PROG_CXX
CXX=`echo $CXX | sed -e 's/-std=gnu++11//g'`
CPPFLAGS="$CPPFLAGS -D_ISOC99_SOURCE -D__STDC_LIMIT_MACROS -D_GNU_SOURCE -DUSE_OS_TZDB=1 -DHAS_REMOTE_API=0"
AC_ARG_ENABLE([debug],

76
m4/ax_cxx_compile_stdcxx.m4
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@ -10,8 +10,8 @@
#
# 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).
# CXXCPP to enable support. VERSION may be '11', '14', '17', or '20' for
# the respective C++ standard version.
#
# 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.
@ -36,13 +36,14 @@
# 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 Jörn Heusipp <osmanx@problemloesungsmaschine.de>
#
# 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 12
#serial 18
dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
dnl (serial version number 13).
@ -51,6 +52,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
m4_if([$1], [11], [ax_cxx_compile_alternatives="11 0x"],
[$1], [14], [ax_cxx_compile_alternatives="14 1y"],
[$1], [17], [ax_cxx_compile_alternatives="17 1z"],
[$1], [20], [ax_cxx_compile_alternatives="20"],
[m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
m4_if([$2], [], [],
[$2], [ext], [],
@ -102,9 +104,18 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
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"
dnl MSVC needs -std:c++NN for C++17 and later (default is C++14)
for alternative in ${ax_cxx_compile_alternatives}; do
for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}"; do
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
for switch in -std=c++${alternative} +std=c++${alternative} "-h std=c++${alternative}" MSVC; do
if test x"$switch" = xMSVC; then
dnl AS_TR_SH maps both `:` and `=` to `_` so -std:c++17 would collide
dnl with -std=c++17. We suffix the cache variable name with _MSVC to
dnl avoid this.
switch=-std:c++${alternative}
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_${switch}_MSVC])
else
cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
fi
AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
$cachevar,
[ac_save_CXX="$CXX"
@ -151,7 +162,6 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
)
dnl Test body for checking C++14 support
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
@ -159,12 +169,24 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
)
dnl Test body for checking C++17 support
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
)
dnl Test body for checking C++20 support
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_20],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
_AX_CXX_COMPILE_STDCXX_testbody_new_in_20
)
dnl Tests for new features in C++11
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
@ -176,7 +198,11 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
#error "This is not a C++ compiler"
#elif __cplusplus < 201103L
// MSVC always sets __cplusplus to 199711L in older versions; newer versions
// only set it correctly if /Zc:__cplusplus is specified as well as a
// /std:c++NN switch:
// https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
#elif __cplusplus < 201103L && !defined _MSC_VER
#error "This is not a C++11 compiler"
@ -467,7 +493,7 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
#error "This is not a C++ compiler"
#elif __cplusplus < 201402L
#elif __cplusplus < 201402L && !defined _MSC_VER
#error "This is not a C++14 compiler"
@ -591,7 +617,7 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_17], [[
#error "This is not a C++ compiler"
#elif __cplusplus < 201703L
#elif __cplusplus < 201703L && !defined _MSC_VER
#error "This is not a C++17 compiler"
@ -957,6 +983,36 @@ namespace cxx17
} // namespace cxx17
#endif // __cplusplus < 201703L
#endif // __cplusplus < 201703L && !defined _MSC_VER
]])
dnl Tests for new features in C++20
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_20], [[
#ifndef __cplusplus
#error "This is not a C++ compiler"
#elif __cplusplus < 202002L && !defined _MSC_VER
#error "This is not a C++20 compiler"
#else
#include <version>
namespace cxx20
{
// As C++20 supports feature test macros in the standard, there is no
// immediate need to actually test for feature availability on the
// Autoconf side.
} // namespace cxx20
#endif // __cplusplus < 202002L && !defined _MSC_VER
]])

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