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Makefile: Make $(LLVM) more flexible

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Introduce a way for developers to easily switch between LLVM versions
with LLVM=/path/to/llvm/ and LLVM=-version. This is a useful
addition to the existing LLVM=1 variable which will select the first
clang and llvm binutils available on the path.

Reviewed-by: Anup Patel <anup@brainfault.org>
Tested-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20250430-improve_llvm_building-v1-1-caae96cc6be6@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Charlie Jenkins
2025-04-30 16:38:31 -07:00
committed by Anup Patel
parent 69a0f0245f
commit 27347f0902
2 changed files with 22 additions and 4 deletions
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14
Makefile
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@@ -104,10 +104,16 @@ endif
# Setup compilation commands # Setup compilation commands
ifneq ($(LLVM),) ifneq ($(LLVM),)
CC = clang ifneq ($(filter %/,$(LLVM)),)
AR = llvm-ar LLVM_PREFIX := $(LLVM)
LD = ld.lld else ifneq ($(filter -%,$(LLVM)),)
OBJCOPY = llvm-objcopy LLVM_SUFFIX := $(LLVM)
endif
CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
else else
ifdef CROSS_COMPILE ifdef CROSS_COMPILE
CC = $(CROSS_COMPILE)gcc CC = $(CROSS_COMPILE)gcc

12
README.md
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@@ -252,6 +252,18 @@ option with:
make LLVM=1 make LLVM=1
``` ```
To build with a specific version of LLVM, a path to a directory containing the
LLVM tools can be provided:
```
make LLVM=/path/to/llvm/
```
If you have versioned llvm tools you would like to use, such as `clang-17`, the LLVM variable can
be set as:
```
make LLVM=-17
```
When using Clang, *CROSS_COMPILE* often does not need to be defined unless When using Clang, *CROSS_COMPILE* often does not need to be defined unless
using GNU binutils with prefixed binary names. *PLATFORM_RISCV_XLEN* will be using GNU binutils with prefixed binary names. *PLATFORM_RISCV_XLEN* will be
used to infer a default triple to pass to Clang, so if *PLATFORM_RISCV_XLEN* used to infer a default triple to pass to Clang, so if *PLATFORM_RISCV_XLEN*