[Driver] allow Android triples to alias for non Android targets
Summary:
Partial revert of r330873 ('[Driver] Reland "Android triples are not
aliases for other triples."')
While we don't want `-target *-linux-android` to alias to non
*-linux-android libs and binaries, it turns out we do want the
opposite. Ie. We would like for `-target *-linux-gnu` to still be
able to use *-android libs and binaries.
In fact, this is used to cross assemble and link the Linux kernel for
Android devices.
`-target *-linux-gnu` needs to be used for the Linux kernel when
using the android binutils prebuilts (*-linux-android).
The use of `-target *-linux-android` on C source files will cause
Clang to perform optimizations based on the presence of bionic (due to
r265481 ('Faster stack-protector for Android/AArch64.')) which is
invalid within the Linux kernel and will produce a non-bootable kernel
image.
Of course, you could just use the standard binutils (*-linux-gnu),
but Android does not distribute these. So this patch fixes a problem
that only occurs when cross assembling and linking a Linux kernel with
the Android provided binutils, which is what is done within Android's
build system.
Reviewers: srhines, pirama, danalbert
Reviewed By: srhines, danalbert
Subscribers: javed.absar, kristof.beyls, cfe-commits
Differential Revision: https://reviews.llvm.org/D53463
llvm-svn: 344941
2018-10-23 03:48:08 +08:00
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// Test that gcc-toolchain option works correctly with a aarch64-linux-gnu
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// triple.
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//
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// RUN: %clang %s -### -v --target=aarch64-linux-gnu \
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// RUN: --gcc-toolchain=%S/Inputs/basic_android_ndk_tree/ 2>&1 \
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// RUN: | FileCheck %s
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//
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2018-10-23 05:25:53 +08:00
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// CHECK: Selected GCC installation: {{.*}}/Inputs/basic_android_ndk_tree/lib/gcc/aarch64-linux-android/4.9
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