[Tarantool-patches] [PATCH luajit] cmake: fix build for non-bash shells

[Maxim Kokryashkin]

Before the patch, the external unwinding probe command could
fail on systems that don't have Bash installed. This patch
changes the command invocation, so it now uses the `sh` symlink.
---
Branch: https://github.com/tarantool/luajit/tree/fckxorg/gh-noticket-fix-build-for-non-bash
PR: https://github.com/tarantool/tarantool/pull/8087

First noticed on Alpine. Here is the build log after the patch:

/luajit/build # cat /etc/issue
Welcome to Alpine Linux 3.15
Kernel \r on an \m (\l)

/luajit/build # cmake .. -DCMAKE_BUILD_TYPE=Debug -DLUAJIT_DISABLE_SYSPROF=ON
-- The C compiler identification is GNU 10.3.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- [SetVersion] Reading version from VCS: v2.1.0-beta3-272-g9c4048dc
-- [SetBuildParallelLevel] CMAKE_BUILD_PARALLEL_LEVEL is 12
-- The ASM compiler identification is GNU
-- Found assembler: /usr/bin/cc
-- LuaJIT system profiler support is disabled
CMake Warning at test/lua-Harness-tests/CMakeLists.txt:9 (message):
  `prove' is not found, so lua-Harness-tests target is not generated


CMake Warning at test/tarantool-tests/CMakeLists.txt:9 (message):
  `prove' is not found, so tarantool-tests target is not generated


-- Configuring done
-- Generating done
-- Build files have been written to: /luajit/build
/luajit/build # make -j
[  1%] Building C object src/host/CMakeFiles/minilua.dir/minilua.c.o
[  1%] Linking C executable minilua
[  1%] Built target minilua
[  2%] Generating buildvm_arch.h
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[  3%] Building C object src/host/CMakeFiles/buildvm.dir/buildvm.c.o
[  3%] Building C object src/host/CMakeFiles/buildvm.dir/buildvm_asm.c.o
[  4%] Building C object src/host/CMakeFiles/buildvm.dir/buildvm_lib.c.o
[  5%] Building C object src/host/CMakeFiles/buildvm.dir/buildvm_peobj.c.o
[  5%] Linking C executable buildvm
[  5%] Built target buildvm
[  6%] Generating lj_vm.S
[  7%] Generating lj_vm.S
[  7%] Generating lj_bcdef.h
[  8%] Generating lj_recdef.h
[  9%] Generating lj_ffdef.h
[ 10%] Generating lj_libdef.h
[ 11%] Generating jit/vmdef.lua
[ 11%] Generating lj_folddef.h
Scanning dependencies of target vm_shared
Scanning dependencies of target vm_static
[ 11%] Building ASM object src/CMakeFiles/vm_shared.dir/lj_vm.S.o
[ 12%] Building ASM object src/CMakeFiles/vm_static.dir/lj_vm.S.o
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[ 12%] Built target vm_static
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[ 12%] Building C object src/CMakeFiles/core_static.dir/lj_buf.c.o
[ 13%] Building C object src/CMakeFiles/core_static.dir/lj_bc.c.o
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 cmake/SetTargetFlags.cmake | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmake/SetTargetFlags.cmake b/cmake/SetTargetFlags.cmake
index 1ca438f1..0303a2c6 100644
--- a/cmake/SetTargetFlags.cmake
+++ b/cmake/SetTargetFlags.cmake
@@ -23,7 +23,7 @@ else()
     # Find out whether the target toolchain always generates
     # unwindtables.
     execute_process(
-      COMMAND bash -c "exec 2>/dev/null; echo 'extern void b(void);int a(void){b();return 0;}' | ${CMAKE_C_COMPILER} -c -x c - -o tmpunwind.o && { grep -qa -e eh_frame -e __unwind_info tmpunwind.o || grep -qU -e eh_frame -e __unwind_info tmpunwind.o; } && echo E; rm -f tmpunwind.o"
+      COMMAND sh -c "exec 2>/dev/null; echo 'extern void b(void);int a(void){b();return 0;}' | ${CMAKE_C_COMPILER} -c -x c - -o tmpunwind.o && { grep -qa -e eh_frame -e __unwind_info tmpunwind.o || grep -qU -e eh_frame -e __unwind_info tmpunwind.o; } && echo E; rm -f tmpunwind.o"
       WORKING_DIRECTORY ${LUAJIT_SOURCE_DIR}
       OUTPUT_VARIABLE TESTUNWIND
       RESULT_VARIABLE TESTUNWIND_RC
-- 
2.38.1