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configure: explicitly require C++11 

Newer autoconf/toolchains may default to newer C++ standards
(e.g. C++23). Explicitly enforce C++11 to preserve expected
behavior.
This commit is contained in:
Ralf Habacker 2026-04-27 21:05:50 +02:00
parent 804e06cce9
commit e8a4cc7c9e
3 changed files with 1075 additions and 0 deletions
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1
aclocal.m4 vendored
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@ -17,6 +17,7 @@ m4_include([m4/ax_c99_strtod.m4])
m4_include([m4/ax_c_picflag.m4])
m4_include([m4/ax_c_underscores_leading.m4])
m4_include([m4/ax_c_underscores_trailing.m4])
m4_include([m4/ax_cxx_compile_stdcxx.m4])
m4_include([m4/ax_enable_suffix.m4])
m4_include([m4/ax_ld_extralibs.m4])
m4_include([m4/ax_ld_rdynamic.m4])

4
configure.ac
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@ -20,6 +20,10 @@ AX_PROG_CC_FOR_BUILD
AC_PREREQ([2.62])
m4_version_prereq([2.70], [], [AC_PROG_CC_C99])
AC_PROG_CXX
# Require C++11 (avoid newer defaults like C++23 from newer toolchains)
AX_CXX_COMPILE_STDCXX(11, noext, mandatory)
AC_PROG_RANLIB
AC_CHECK_TOOL(LD, ld, false)
AC_CHECK_TOOL(AR, ar, false)

1070
m4/ax_cxx_compile_stdcxx.m4 Normal file
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