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ARCH_USING_PATCHABLE_FUNCTION_ENTRY depends on toolchain support for -fpatchable-function-entry option. The current script that checks for this support only handles GCC. Rename the script and extend it to detect support for -fpatchable-function-entry with Clang as well, allowing clean cross-compilation with Clang toolchains. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com> Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/20260127084926.34497-2-hbathini@linux.ibm.com
26 lines
917 B
Bash
Executable File
26 lines
917 B
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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set -e
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# To debug, uncomment the following line
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# set -x
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# Output from -fpatchable-function-entry can only vary on ppc64 elfv2, so this
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# should not be invoked for other targets. Therefore we can pass in -m64 and
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# -mabi explicitly, to take care of toolchains defaulting to other targets.
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# Test whether the compile option -fpatchable-function-entry exists and
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# generates appropriate code
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echo "int func() { return 0; }" | \
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$* -m64 -mabi=elfv2 -S -x c -O2 -fpatchable-function-entry=2 - -o - 2> /dev/null | \
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grep -q "__patchable_function_entries"
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# Test whether nops are generated after the local entry point
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echo "int x; int func() { return x; }" | \
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$* -m64 -mabi=elfv2 -S -x c -O2 -fpatchable-function-entry=2 - -o - 2> /dev/null | \
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awk 'BEGIN { RS = ";" } /\.localentry.*nop.*\n[[:space:]]*nop/ { print $0 }' | \
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grep -q "func:"
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exit 0
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