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zcash-patched-for-explorer
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build: force a c++ standard to be specified 

Newer compilers may switch to newer standards by default. For example, gcc6
uses std=gnu++14 by default.
This commit is contained in:
Cory Fields 2017-02-22 13:33:22 -05:00 committed by Jack Grigg
parent 0bcd85bee8
commit 943f19fec7
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GPG Key ID: 665DBCD284F7DAFF
2 changed files with 8 additions and 2 deletions
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8
build-aux/m4/ax_cxx_compile_stdcxx.m4
View File

@ -57,8 +57,14 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
[$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
[$3], [optional], [ax_cxx_compile_cxx$1_required=false],
[m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
m4_if([$4], [], [ax_cxx_compile_cxx$1_try_default=true],
[$4], [default], [ax_cxx_compile_cxx$1_try_default=true],
[$4], [nodefault], [ax_cxx_compile_cxx$1_try_default=false],
[m4_fatal([invalid fourth argument `$4' to AX_CXX_COMPILE_STDCXX])])
AC_LANG_PUSH([C++])dnl
ac_success=no
m4_if([$4], [nodefault], [], [dnl
AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
ax_cv_cxx_compile_cxx$1,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
@ -66,7 +72,7 @@ AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
[ax_cv_cxx_compile_cxx$1=no])])
if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
ac_success=yes
fi
fi])
m4_if([$2], [noext], [], [dnl
if test x$ac_success = xno; then

2
configure.ac
View File

@ -56,7 +56,7 @@ case $host in
;;
esac
dnl Require C++11 compiler (no GNU extensions)
AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])
AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory], [nodefault])
dnl Check if -latomic is required for <std::atomic>
CHECK_ATOMIC