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build: enable experimental Cxx20 support #4600

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merged 5 commits into from
Dec 11, 2021
Merged

build: enable experimental Cxx20 support #4600

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0f9df02
build: Add optional c++20 compilation option
PastaPastaPasta Oct 5, 2021
974a546
build: update ax_cxx_compile_stdcxx.m4 to be compatible with c++20
PastaPastaPasta Dec 1, 2021
6c22c82
fix: fix c++20 build error for undefined identifier
PastaPastaPasta Dec 1, 2021
4fd24ca
ci: enable c++20 build during ci
PastaPastaPasta Dec 6, 2021
c41063a
cxx17 -> cxx20
PastaPastaPasta Dec 11, 2021
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build: update ax_cxx_compile_stdcxx.m4 to be compatible with c++20
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@PastaPastaPasta
PastaPastaPasta committed Dec 6, 2021
commit 974a5461d36022c0c7d91611626b167a05a1caba
27 changes: 24 additions & 3 deletions build-aux/m4/ax_cxx_compile_stdcxx.m4
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Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,9 @@
#
# 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' (for the C++11 standard),
# '14' (for the C++14 standard), '17' (for the C++17 standard) or
# '20' (for the C++20 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.
Expand Down Expand Up @@ -46,10 +47,14 @@
dnl This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
dnl (serial version number 13).

dnl Modifications:
dnl Add support for C++20, with no new tests

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 2a"],
[m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
m4_if([$2], [], [],
[$2], [ext], [],
Expand Down Expand Up @@ -154,6 +159,22 @@ m4_define([_AX_CXX_COMPILE_STDCXX_testbody_17],
_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
)


dnl Test body for checking C++20 support: R modification
m4_define([_AX_CXX_COMPILE_STDCXX_testbody_20],
#ifndef __cplusplus
#error "This is not a C++ compiler"
dnl value from 2020-01-14 draft, clang 11 has 202002L
#elif __cplusplus < 201703L
#error "This is not a C++20 compiler"
#else
_AX_CXX_COMPILE_STDCXX_testbody_new_in_11
_AX_CXX_COMPILE_STDCXX_testbody_new_in_14
_AX_CXX_COMPILE_STDCXX_testbody_new_in_17
#endif
)


dnl Tests for new features in C++11

m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
Expand Down Expand Up @@ -251,7 +272,7 @@ namespace cxx11
}

int
test(const int c, volatile int v)
test(const int c, volatile int v) // 'volatile is deprecated in C++20'
{
static_assert(is_same<int, decltype(0)>::value == true, "");
static_assert(is_same<int, decltype(c)>::value == false, "");
Expand Down