dev-lang/rust: must depend on dev-lang/gcc[cxx]

Found while compiling with a fresh crossdev installation.
Without that, the build fails with the following error:

```[profiler_builtins 0.0.0] cargo::rerun-if-env-changed=LLVM_PROFILER_RT_LIB
[profiler_builtins 0.0.0] cargo::rerun-if-env-changed=RUST_COMPILER_RT_FOR_PROFILER
[profiler_builtins 0.0.0] cargo::rerun-if-changed=/usr/i686-pc-linux-musl/tmp/portage/dev-lang/rust-1.82.0-r102/work/rustc-1.82.0-src/src/llvm-project/compiler-rt/lib/profile
[profiler_builtins 0.0.0] cargo::rerun-if-changed=/usr/i686-pc-linux-musl/tmp/portage/dev-lang/rust-1.82.0-r102/work/rustc-1.82.0-src/src/llvm-project/compiler-rt/include
[profiler_builtins 0.0.0] TARGET = Some("i686-unknown-linux-gnu")
[profiler_builtins 0.0.0] OPT_LEVEL = Some("3")
[profiler_builtins 0.0.0] HOST = Some("x86_64-unknown-linux-gnu")
[profiler_builtins 0.0.0] cargo:rerun-if-env-changed=CC_i686-unknown-linux-gnu
[profiler_builtins 0.0.0] CC_i686-unknown-linux-gnu = None
[profiler_builtins 0.0.0] cargo:rerun-if-env-changed=CC_i686_unknown_linux_gnu
[profiler_builtins 0.0.0] CC_i686_unknown_linux_gnu = Some("i686-pc-linux-musl-gcc")
[profiler_builtins 0.0.0] cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
[profiler_builtins 0.0.0] cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
[profiler_builtins 0.0.0] CRATE_CC_NO_DEFAULTS = None
[profiler_builtins 0.0.0] DEBUG = Some("false")
[profiler_builtins 0.0.0] CARGO_CFG_TARGET_FEATURE = Some("fxsr,sse,sse2")
[profiler_builtins 0.0.0] cargo:rerun-if-env-changed=CFLAGS_i686-unknown-linux-gnu
[profiler_builtins 0.0.0] CFLAGS_i686-unknown-linux-gnu = None
[profiler_builtins 0.0.0] cargo:rerun-if-env-changed=CFLAGS_i686_unknown_linux_gnu
[profiler_builtins 0.0.0] CFLAGS_i686_unknown_linux_gnu = Some("-ffunction-sections -fdata-sections -fPIC -m32 -march=i686")
[profiler_builtins 0.0.0] cargo:warning=i686-pc-linux-musl-gcc: error: /usr/i686-pc-linux-musl/tmp/portage/dev-lang/rust-1.82.0-r102/work/rustc-1.82.0-src/src/llvm-project/compiler-rt/lib/profile/InstrProfiling
Runtime.cpp: C++ compiler not installed on this system
[profiler_builtins 0.0.0]
[profiler_builtins 0.0.0]
[profiler_builtins 0.0.0] error occurred: Command "i686-pc-linux-musl-gcc" "-O3" "-ffunction-sections" "-fdata-sections" "-fPIC" "-m32" "-march=i686" "-I" "/usr/i686-pc-linux-musl/tmp/portage/dev-lang/rust-1.82
.0-r102/work/rustc-1.82.0-src/src/llvm-project/compiler-rt/include" "-ffunction-sections" "-fdata-sections" "-fPIC" "-m32" "-march=i686" "-fno-builtin" "-fomit-frame-pointer" "-fvisibility=hidden" "-DVISIBILITY
_HIDDEN" "-DCOMPILER_RT_HAS_UNAME=1" "-DCOMPILER_RT_HAS_FCNTL_LCK=1" "-DCOMPILER_RT_HAS_ATOMICS=1" "-o" "/usr/i686-pc-linux-musl/tmp/portage/dev-lang/rust-1.82.0-r102/work/rustc-1.82.0-src/build/x86_64-unknown-
linux-gnu/stage1-std/i686-unknown-linux-gnu/release/build/profiler_builtins-acc5b54be66bd911/out/79fe831ac9526f6c-InstrProfilingRuntime.o" "-c" "/usr/i686-pc-linux-musl/tmp/portage/dev-lang/rust-1.82.0-r102/wor
k/rustc-1.82.0-src/src/llvm-project/compiler-rt/lib/profile/
InstrProfilingRuntime.cpp" with args i686-pc-linux-musl-gcc did not execute successfully (status code exit status: 1).
[profiler_builtins 0.0.0]
[profiler_builtins 0.0.0]
The following warnings were emitted during compilation:

warning: profiler_builtins@0.0.0: i686-pc-linux-musl-gcc: error: /usr/i686-pc-linux-musl/tmp/portage/dev-lang/rust-1.82.0-r102/work/rustc-1.82.0-src/src/llvm-project/compiler-rt/lib/profile/InstrProfilingRuntime.cpp: C++ compiler not installed on this system

error: failed to run custom build command for `profiler_builtins v0.0.0 (/usr/i686-pc-linux-musl/tmp/portage/dev-lang/rust-1.82.0-r102/work/rustc-1.82.0-src/library/profiler_builtins)`
note: To improve backtraces for build dependencies, set the CARGO_PROFILE_RELEASE_BUILD_OVERRIDE_DEBUG=true environment variable to enable debug information generation.```

Signed-off-by: Cristian Othón Martínez Vera <cfuga@cfuga.mx>
Closes: https://github.com/gentoo/gentoo/pull/40600
Signed-off-by: Arthur Zamarin <arthurzam@gentoo.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/dev-lang/rust/rust-1.79.0-r101.ebuild b/dev-lang/rust/rust-1.79.0-r101.ebuild
index 7bcddb3c4dba..ad7ef8defa1d 100644
--- a/dev-lang/rust/rust-1.79.0-r101.ebuild
+++ b/dev-lang/rust/rust-1.79.0-r101.ebuild
@@ -64,7 +64,7 @@ LLVM_DEPEND+=( "	$(llvm_gen_dep 'llvm-core/llvm:${LLVM_SLOT}')" )
 BDEPEND="${PYTHON_DEPS}
 	app-eselect/eselect-rust
 	|| (
-		>=sys-devel/gcc-4.7
+		>=sys-devel/gcc-4.7[cxx]
 		>=llvm-core/clang-3.5
 	)
 	!system-llvm? (