From: Ekaitz Zarraga <ekaitz@elenq.tech>
To: 67075@debbugs.gnu.org
Subject: [bug#67075] [PATCH] build: zig-build-system: Add CPU option
Date: Sat, 18 Nov 2023 17:52:48 +0100 [thread overview]
Message-ID: <85988d3d-2099-ee38-ca5d-b8fcc55dc88c@elenq.tech> (raw)
In-Reply-To: <WqKhVsnCWxUfZxvdoFcRDtlW88FnHPZ5QqzSVDUYUOipndmdsfAe3XLPXTPookk6OgqJ8bFaOVCOVAlGWOR3-hs4TD-EtBWBlmm_tAvS75s=@elenq.tech>
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Hi,
Following Efraim's suggestion I arranged a new patch around the tuning
option. I needed to patch Zig itself to use baseline cpu by default,
which is safer in general for us.
If anyone need a more specific cpu, can use the tuning option to choose it.
Maybe I should split the changes in Zig and the tuning system, but if I
do they wont appear together, and they mostly only make sense if applied
at once.
Please let me know if you like this one better.
Hope it's cool.
Cheers,
Ekaitz
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[-- Type: text/x-patch, Size: 5883 bytes --]
From 03616b9764278e05d74f8e8bf5d65b043603a437 Mon Sep 17 00:00:00 2001
Message-ID: <03616b9764278e05d74f8e8bf5d65b043603a437.1700325640.git.ekaitz@elenq.tech>
From: Ekaitz Zarraga <ekaitz@elenq.tech>
Date: Sat, 18 Nov 2023 17:29:07 +0100
Subject: [PATCH] gnu: zig: Make compiler tunable.
In order to make Zig tunable, we have to make sure by default it does
the right thing, that is use the `baseline` CPU instead of the `native`
one because the tuning system only adds an extra flag to the compiler
command line execution.
* gnu/packages/patches/zig-use-baseline-cpu-by-default.patch: Add file.
* gnu/packages/zig.scm(zig-0.10.1): Apply patch above.
* guix/transformations.scm(tuning-compiler): Add support for zig.
Change-Id: I40bd28071c97c0dd0a907c704072b52b26d2de28
---
.../zig-use-baseline-cpu-by-default.patch | 36 +++++++++++++++++++
gnu/packages/zig.scm | 3 +-
guix/transformations.scm | 22 ++++++++----
3 files changed, 54 insertions(+), 7 deletions(-)
create mode 100644 gnu/packages/patches/zig-use-baseline-cpu-by-default.patch
diff --git a/gnu/packages/patches/zig-use-baseline-cpu-by-default.patch b/gnu/packages/patches/zig-use-baseline-cpu-by-default.patch
new file mode 100644
index 0000000000..be78d9c6c7
--- /dev/null
+++ b/gnu/packages/patches/zig-use-baseline-cpu-by-default.patch
@@ -0,0 +1,36 @@
+From 1dc188129950031243c5a0c80ec2562fab8ec549 Mon Sep 17 00:00:00 2001
+From: Ekaitz Zarraga <ekaitz@elenq.tech>
+Date: Sat, 18 Nov 2023 15:04:16 +0100
+Subject: [PATCH] Use `baseline` cpu by default.
+
+This helps Guix tune the package later. Tunning will only add
+`-Dcpu=whatever` which should override the standard behaviour.
+
+Zig by default uses `native`, which interferes with our build process.
+In our previous zig-build-system we chose to add `-Dcpu=baseline` flag
+in each `zig build` execution, but that doesn't allow us to tune the
+package later. Tunning is only designed to add extra flags in the
+command line call, and we already had one set for the baseline case.
+With this patch we set the standard behavior to `baseline` so we don't
+need to add the `-Dcpu=baseline` flag in the zig-build-system and we can
+tune with no issues.
+---
+ lib/std/zig/CrossTarget.zig | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/std/zig/CrossTarget.zig b/lib/std/zig/CrossTarget.zig
+index 6c59a4a3a..f5ec065fe 100644
+--- a/lib/std/zig/CrossTarget.zig
++++ b/lib/std/zig/CrossTarget.zig
+@@ -12,7 +12,7 @@ const mem = std.mem;
+ /// `null` means native.
+ cpu_arch: ?Target.Cpu.Arch = null,
+
+-cpu_model: CpuModel = CpuModel.determined_by_cpu_arch,
++cpu_model: CpuModel = CpuModel.baseline,
+
+ /// Sparse set of CPU features to add to the set from `cpu_model`.
+ cpu_features_add: Target.Cpu.Feature.Set = Target.Cpu.Feature.Set.empty,
+--
+2.41.0
+
diff --git a/gnu/packages/zig.scm b/gnu/packages/zig.scm
index dcca9a1121..82b83f44c2 100644
--- a/gnu/packages/zig.scm
+++ b/gnu/packages/zig.scm
@@ -42,7 +42,8 @@ (define-public zig-0.10
(file-name (git-file-name name version))
(sha256
(base32 "1sh5xjsksl52i4cfv1qj36sz5h0ln7cq4pdhgs3960mk8a90im7b"))
- (patches (search-patches "zig-do-not-link-against-librt.patch"))))
+ (patches (search-patches "zig-do-not-link-against-librt.patch"
+ "zig-use-Dcpu-baseline-by-default.patch"))))
(build-system cmake-build-system)
(inputs
(list clang-15 ; Clang propagates llvm.
diff --git a/guix/transformations.scm b/guix/transformations.scm
index 9cba6bedab..8964feb046 100644
--- a/guix/transformations.scm
+++ b/guix/transformations.scm
@@ -439,7 +439,8 @@ (define tuning-compiler
actual compiler."
(define wrapper
#~(begin
- (use-modules (ice-9 match))
+ (use-modules (ice-9 match)
+ (ice-9 string-fun))
(define psabi #$(gcc-architecture->micro-architecture-level
micro-architecture))
@@ -486,11 +487,20 @@ (define tuning-compiler
(apply
execl next
(append (cons next arguments)
- (if (and (search-next "go")
+ (cond
+ ((and (search-next "go")
(string=? next (search-next "go")))
- '()
- (list (string-append "-march="
- #$micro-architecture)))))))))))
+ '())
+ ((and (search-next "zig")
+ (string=? next (search-next "zig"))
+ (list (string-append
+ ;; https://issues.guix.gnu.org/67075#3
+ "-Dcpu="
+ (string-replace-substring
+ #$micro-architecture "-" "_")))))
+ (else
+ (list (string-append "-march="
+ #$micro-architecture))))))))))))
(define program
(program-file (string-append "tuning-compiler-wrapper-" micro-architecture)
@@ -508,7 +518,7 @@ (define tuning-compiler
(symlink #$program
(string-append bin "/" program)))
'("cc" "gcc" "clang" "g++" "c++" "clang++"
- "go")))))))
+ "go" "zig")))))))
(define (build-system-with-tuning-compiler bs micro-architecture)
"Return a variant of BS, a build system, that ensures that the compiler that
base-commit: a514973413dc8179100ef8f0fcf41f5ac38c982f
--
2.41.0
prev parent reply other threads:[~2023-11-18 16:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-11 13:09 [bug#67075] [PATCH] build: zig-build-system: Add CPU option Ekaitz Zarraga
2023-11-12 14:38 ` Efraim Flashner
2023-11-12 16:38 ` Ekaitz Zarraga
2023-11-12 16:41 ` Ekaitz Zarraga
2023-11-18 16:52 ` Ekaitz Zarraga [this message]
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