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Add option to build with a LLVM prefix or LLVM with suffix instead of system LLVM/in-tree LLVM #61

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Add option to build with a LLVM prefix or LLVM with suffix instead of system LLVM/in-tree LLVM #61

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4481069
Add option to build with a LLVM prefix instead of system LLVM/Built LLVM
xadaemon Jan 1, 2026
7e3c38f
Simplify the llvm discovery in the makefile
xadaemon Jan 9, 2026
71f8cd4
add note about using LLVM_CONFIG
xadaemon Jan 9, 2026
4bc9062
add $LLVM_CONFIG --bindir to the right spots to avoid needing `opt` o…
xadaemon Jan 9, 2026
7c9a10a
fix paths on the makefile that were leftover from version before feed…
xadaemon Jan 9, 2026
6d64162
update the readme with the correct build command for LLVM_CONFIG over…
xadaemon Jan 9, 2026
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6 changes: 6 additions & 0 deletions README.md
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Expand Up @@ -53,6 +53,12 @@ To build GNAT LLVM from sources, follow these steps:
the options that suit your needs. After installing/building, make sure the
LLVM bin directory containing `llvm-config` and `clang` is in your `PATH`.

Alternatively, you can invoke make with an environment variable named
`LLVM_CONFIG` pointing to your `llvm-config` binary, this way the LLVM you
intend to use does not need to be in your `PATH`.

make LLVM_CONFIG=/some/path/to/llvm-config

An alternative only suitable for core GNAT LLVM development on x86 native
configurations is to use the following command, assuming you have CMake
version >= 3.20 in your path:
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13 changes: 4 additions & 9 deletions llvm-interface/Makefile
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Expand Up @@ -20,17 +20,12 @@ ADAINCLUDE=lib/rts-llvm/adainclude
ADALIB=lib/rts-llvm/adalib

pwd:=$(shell pwd)

LLVM_BUILD_DIR=$(pwd)/../llvm/llvm-obj

ifneq ($(wildcard $(LLVM_BUILD_DIR)/bin/llvm-config),)
LLVM_CONFIG=$(LLVM_BUILD_DIR)/bin/llvm-config
LLVM_SRC=$(shell cd `$(LLVM_CONFIG) --includedir`/../..;pwd)
CLANG_CXXFLAGS=-I$(LLVM_BUILD_DIR)/tools/clang/include -I$(LLVM_SRC)/clang/include
ifeq ($(LLVM_CONFIG),)
LLVM_CONFIG:=llvm-config
else
LLVM_CONFIG=llvm-config
CLANG_CXXFLAGS=
LLVM_CONFIG:=$(LLVM_CONFIG)
endif
CLANG_CXXFLAGS=-I$(shell `$(LLVM_CONFIG) --includedir`)/clang

LDFLAGS=$(shell $(LLVM_CONFIG) --libs all --ldflags --system-libs)
CXXFLAGS=
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4 changes: 2 additions & 2 deletions llvm-interface/check_for_LLVM_aliasing_bug.sh
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Expand Up @@ -110,8 +110,8 @@ declare i32 @report__ident_int(i32)
!24 = !{!10, !13, i64 4, i64 4}

EOF
opt -O2 obj/c43204h.ll -o obj/c43204h_o.bc
llvm-dis obj/c43204h_o.bc
$("$LLVM_CONFIG" --bindir)/opt -O2 obj/c43204h.ll -o obj/c43204h_o.bc
$("$LLVM_CONFIG" --bindir)/llvm-dis obj/c43204h_o.bc
if [ "`wc -l obj/c43204h_o.ll | awk '{print $1}'` " -gt "40" ]; then
BUG=False
echo "OK: using LLVM without the aliasing bug"
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