unsupported linker arg: --dependency-file

[ssmid]

CMAKE_BUILD_PARALLEL_LEVEL=28. /build x86_64-linux-gnu baseline

[...]
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Arch Linux
master/50d8e88b

[kassane]

Related:

• support --dependency-file flag in the linker zig#22213 (comment)

Try add:

if (CMAKE_HOST_UNIX)
	set(CMAKE_C_LINKER_DEPFILE_SUPPORTED FALSE)
	set(CMAKE_CXX_LINKER_DEPFILE_SUPPORTED FALSE)
endif()

Works for me! Same problem in archlinux - cmake version 3.31.4.

[ssmid]

Didn't work for me but I also didn't any variables with those names. Neither online nor with cmake --help-variable-list.

[ssmid]

Nevermind. It didn't work when using exported environment variables but when adding them as command line arguments (-DCMAKE_C_LINKER_DEPFILE_SUPPORTED).

[ssmid]

In case someone's interested in it:

diff --git a/build b/build
index fb259b0ff..773f3cb15 100755
--- a/build
+++ b/build
@@ -28,6 +34,8 @@ cmake "$ROOTDIR/llvm" \
   -DCMAKE_INSTALL_PREFIX="$ROOTDIR/out/host" \
   -DCMAKE_PREFIX_PATH="$ROOTDIR/out/host" \
   -DCMAKE_BUILD_TYPE=Release \
+  -DCMAKE_C_LINKER_DEPFILE_SUPPORTED=FALSE \
+  -DCMAKE_CXX_LINKER_DEPFILE_SUPPORTED=FALSE \
   -DLLVM_ENABLE_BINDINGS=OFF \
   -DLLVM_ENABLE_LIBEDIT=OFF \
   -DLLVM_ENABLE_LIBPFM=OFF \
@@ -65,6 +73,8 @@ cmake "$ROOTDIR/zig" \
   -DCMAKE_INSTALL_PREFIX="$ROOTDIR/out/host" \
   -DCMAKE_PREFIX_PATH="$ROOTDIR/out/host" \
   -DCMAKE_BUILD_TYPE=Release \
+  -DCMAKE_C_LINKER_DEPFILE_SUPPORTED=FALSE \
+  -DCMAKE_CXX_LINKER_DEPFILE_SUPPORTED=FALSE \
   -DZIG_VERSION="$ZIG_VERSION"
 cmake --build . --target install
 
@@ -86,7 +96,9 @@ cmake "$ROOTDIR/zlib" \
   -DCMAKE_ASM_COMPILER="$ZIG;cc;-fno-sanitize=all;-s;-target;$TARGET;-mcpu=$MCPU" \
   -DCMAKE_RC_COMPILER="$ROOTDIR/out/host/bin/llvm-rc" \
   -DCMAKE_AR="$ROOTDIR/out/host/bin/llvm-ar" \
-  -DCMAKE_RANLIB="$ROOTDIR/out/host/bin/llvm-ranlib"
+  -DCMAKE_RANLIB="$ROOTDIR/out/host/bin/llvm-ranlib" \
+  -DCMAKE_C_LINKER_DEPFILE_SUPPORTED=FALSE \
+  -DCMAKE_CXX_LINKER_DEPFILE_SUPPORTED=FALSE
 cmake --build . --target install
 
 # Same deal for zstd.
@@ -149,6 +161,8 @@ cmake "$ROOTDIR/llvm" \
   -DCMAKE_RC_COMPILER="$ROOTDIR/out/host/bin/llvm-rc" \
   -DCMAKE_AR="$ROOTDIR/out/host/bin/llvm-ar" \
   -DCMAKE_RANLIB="$ROOTDIR/out/host/bin/llvm-ranlib" \
+  -DCMAKE_C_LINKER_DEPFILE_SUPPORTED=FALSE \
+  -DCMAKE_CXX_LINKER_DEPFILE_SUPPORTED=FALSE \
   -DLLVM_ENABLE_BACKTRACES=OFF \
   -DLLVM_ENABLE_BINDINGS=OFF \
   -DLLVM_ENABLE_CRASH_OVERRIDES=OFF \

[alexrp]

Let's track this on the ziglang/zig repo: ziglang/zig#22213

[ssmid]

It might be worth to push above fix to the repo as long as this flag isn't implemented by zig, no?

[alexrp]

I'm not yet convinced that this isn't a CMake bug. I can't find any good reason why CMake would conclude that zig cc supports this flag when it very obviously doesn't by virtue of, well, failing when it's used.