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Add C++ support to configure.

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This is an optional dependency. It'll be used for the upcoming LLVM
based just in time compilation support, which needs to wrap a few LLVM
C++ APIs so they're accessible from C..

For now test for C++ compilers unconditionally, without failing if not
present, to ensure wide buildfarm coverage. If we're bothered by the
additional test times (which are quite short) or verbosity, we can
later make the tests conditional on --with-llvm.

Author: Andres Freund
Discussion: https://postgr.es/m/20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de
This commit is contained in:
Andres Freund
2018-03-20 15:41:15 -07:00
parent a364dfa4ac
commit 6869b4f258
6 changed files with 1012 additions and 10 deletions
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40
config/c-compiler.m4
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@ -477,6 +477,46 @@ AC_DEFUN([PGAC_PROG_CC_VAR_OPT],
# PGAC_PROG_VARCXX_VARFLAGS_OPT
# -----------------------
# Given a compiler, variable name and a string, check if the compiler
# supports the string as a command-line option. If it does, add the
# string to the given variable.
AC_DEFUN([PGAC_PROG_VARCXX_VARFLAGS_OPT],
[define([Ac_cachevar], [AS_TR_SH([pgac_cv_prog_$1_cxxflags_$3])])dnl
AC_CACHE_CHECK([whether ${$1} supports $3, for $2], [Ac_cachevar],
[pgac_save_CXXFLAGS=$CXXFLAGS
pgac_save_CXX=$CXX
CXX=${$1}
CXXFLAGS="${$2} $3"
ac_save_cxx_werror_flag=$ac_cxx_werror_flag
ac_cxx_werror_flag=yes
AC_LANG_PUSH(C++)
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[Ac_cachevar=yes],
[Ac_cachevar=no])
AC_LANG_POP([])
ac_cxx_werror_flag=$ac_save_cxx_werror_flag
CXXFLAGS="$pgac_save_CXXFLAGS"
CXX="$pgac_save_CXX"])
if test x"$Ac_cachevar" = x"yes"; then
$2="${$2} $3"
fi
undefine([Ac_cachevar])dnl
])# PGAC_PROG_VARCXX_VARFLAGS_OPT
# PGAC_PROG_CXX_CFLAGS_OPT
# -----------------------
# Given a string, check if the compiler supports the string as a
# command-line option. If it does, add the string to CXXFLAGS.
AC_DEFUN([PGAC_PROG_CXX_CFLAGS_OPT],
[PGAC_PROG_VARCXX_VARFLAGS_OPT(CXX, CXXFLAGS, $1)
])# PGAC_PROG_CXX_VAR_OPT
# PGAC_PROG_CC_LDFLAGS_OPT
# ------------------------
# Given a string, check if the compiler supports the string as a