postgresql/config/llvm.m4
Thomas Munro 3b0f20f6ce Log LLVM library version in configure output.
When scanning build farm results, it's useful to be able to see which
version is in use.  For the Meson build system, this information was
already displayed.

Back-patch to all supported branches.

Discussion: https://postgr.es/m/4022690.1697852728%40sss.pgh.pa.us
2023-10-22 14:23:11 +13:00

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# config/llvm.m4
# PGAC_LLVM_SUPPORT
# -----------------
#
# Look for the LLVM installation, check that it's new enough, set the
# corresponding LLVM_{CFLAGS,CXXFLAGS,BINPATH} and LDFLAGS
# variables. Also verify that CLANG is available, to transform C
# into bitcode.
#
AC_DEFUN([PGAC_LLVM_SUPPORT],
[
AC_REQUIRE([AC_PROG_AWK])
AC_ARG_VAR(LLVM_CONFIG, [path to llvm-config command])
PGAC_PATH_PROGS(LLVM_CONFIG, llvm-config llvm-config-7 llvm-config-6.0 llvm-config-5.0 llvm-config-4.0 llvm-config-3.9)
# no point continuing if llvm wasn't found
if test -z "$LLVM_CONFIG"; then
AC_MSG_ERROR([llvm-config not found, but required when compiling --with-llvm, specify with LLVM_CONFIG=])
fi
# check if detected $LLVM_CONFIG is executable
pgac_llvm_version="$($LLVM_CONFIG --version 2> /dev/null || echo no)"
if test "x$pgac_llvm_version" = "xno"; then
AC_MSG_ERROR([$LLVM_CONFIG does not work])
fi
# and whether the version is supported
if echo $pgac_llvm_version | $AWK -F '.' '{ if ([$]1 >= 4 || ([$]1 == 3 && [$]2 >= 9)) exit 1; else exit 0;}';then
AC_MSG_ERROR([$LLVM_CONFIG version is $pgac_llvm_version but at least 3.9 is required])
fi
AC_MSG_NOTICE([using llvm $pgac_llvm_version])
# need clang to create some bitcode files
AC_ARG_VAR(CLANG, [path to clang compiler to generate bitcode])
PGAC_PATH_PROGS(CLANG, clang clang-7 clang-6.0 clang-5.0 clang-4.0 clang-3.9)
if test -z "$CLANG"; then
AC_MSG_ERROR([clang not found, but required when compiling --with-llvm, specify with CLANG=])
fi
# make sure clang is executable
if test "x$($CLANG --version 2> /dev/null || echo no)" = "xno"; then
AC_MSG_ERROR([$CLANG does not work])
fi
# Could check clang version, but it doesn't seem that
# important. Systems with a new enough LLVM version are usually
# going to have a decent clang version too. It's also not entirely
# clear what the minimum version is.
# Collect compiler flags necessary to build the LLVM dependent
# shared library.
for pgac_option in `$LLVM_CONFIG --cppflags`; do
case $pgac_option in
-I*|-D*) LLVM_CPPFLAGS="$pgac_option $LLVM_CPPFLAGS";;
esac
done
for pgac_option in `$LLVM_CONFIG --ldflags`; do
case $pgac_option in
-L*) LDFLAGS="$LDFLAGS $pgac_option";;
esac
done
# ABI influencing options, standard influencing options
for pgac_option in `$LLVM_CONFIG --cxxflags`; do
case $pgac_option in
-fno-rtti*) LLVM_CXXFLAGS="$LLVM_CXXFLAGS $pgac_option";;
-std=*) LLVM_CXXFLAGS="$LLVM_CXXFLAGS $pgac_option";;
esac
done
# Look for components we're interested in, collect necessary
# libs. As some components are optional, we can't just list all of
# them as it'd raise an error.
pgac_components='';
for pgac_component in `$LLVM_CONFIG --components`; do
case $pgac_component in
engine) pgac_components="$pgac_components $pgac_component";;
debuginfodwarf) pgac_components="$pgac_components $pgac_component";;
orcjit) pgac_components="$pgac_components $pgac_component";;
passes) pgac_components="$pgac_components $pgac_component";;
native) pgac_components="$pgac_components $pgac_component";;
perfjitevents) pgac_components="$pgac_components $pgac_component";;
esac
done;
# And then get the libraries that need to be linked in for the
# selected components. They're large libraries, we only want to
# link them into the LLVM using shared library.
for pgac_option in `$LLVM_CONFIG --libs --system-libs $pgac_components`; do
case $pgac_option in
-l*) LLVM_LIBS="$LLVM_LIBS $pgac_option";;
esac
done
LLVM_BINPATH=`$LLVM_CONFIG --bindir`
dnl LLVM_CONFIG, CLANG are already output via AC_ARG_VAR
AC_SUBST(LLVM_LIBS)
AC_SUBST(LLVM_CPPFLAGS)
AC_SUBST(LLVM_CFLAGS)
AC_SUBST(LLVM_CXXFLAGS)
AC_SUBST(LLVM_BINPATH)
])# PGAC_LLVM_SUPPORT
# PGAC_CHECK_LLVM_FUNCTIONS
# -------------------------
#
# Check presence of some optional LLVM functions.
# (This shouldn't happen until we're ready to run AC_CHECK_DECLS tests;
# because PGAC_LLVM_SUPPORT runs very early, it's not an appropriate place.)
#
AC_DEFUN([PGAC_CHECK_LLVM_FUNCTIONS],
[
# Check which functionality is present
SAVE_CPPFLAGS="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $LLVM_CPPFLAGS"
AC_CHECK_DECLS([LLVMOrcGetSymbolAddressIn], [], [], [[#include <llvm-c/OrcBindings.h>]])
AC_CHECK_DECLS([LLVMGetHostCPUName, LLVMGetHostCPUFeatures], [], [], [[#include <llvm-c/TargetMachine.h>]])
AC_CHECK_DECLS([LLVMCreateGDBRegistrationListener, LLVMCreatePerfJITEventListener], [], [], [[#include <llvm-c/ExecutionEngine.h>]])
CPPFLAGS="$SAVE_CPPFLAGS"
])# PGAC_CHECK_LLVM_FUNCTIONS