[flang-rt] Enable -funwind-tables so that backtrace works. (#130848)

vzakhari · web-flow · commit d547005f6c2b · 2025-03-11T16:14:53.000-07:00
`backtrace` will not show anything unless it can unwind from
Fortran runtime, so it is useful to have this ability even
in the release build.
diff --git a/flang-rt/cmake/modules/AddFlangRT.cmake b/flang-rt/cmake/modules/AddFlangRT.cmake
@@ -198,7 +198,7 @@ function (add_flangrt_library name)
     # Use compiler-specific options to disable exceptions and RTTI.
     if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
       target_compile_options(${tgtname} PRIVATE
-          $<$<COMPILE_LANGUAGE:CXX>:-fno-exceptions -fno-rtti -fno-unwind-tables -fno-asynchronous-unwind-tables>
+          $<$<COMPILE_LANGUAGE:CXX>:-fno-exceptions -fno-rtti -funwind-tables -fno-asynchronous-unwind-tables>
         )
     elseif (MSVC)
       target_compile_options(${tgtname} PRIVATE

Original file line number	Diff line number	Diff line change
`@@ -198,7 +198,7 @@ function (add_flangrt_library name)`
`198`	`198`	`# Use compiler-specific options to disable exceptions and RTTI.`
`199`	`199`	`if (LLVM_COMPILER_IS_GCC_COMPATIBLE)`
`200`	`200`	`target_compile_options(${tgtname} PRIVATE`
`201`		`- $<$<COMPILE_LANGUAGE:CXX>:-fno-exceptions -fno-rtti -fno-unwind-tables -fno-asynchronous-unwind-tables>`
	`201`	`+ $<$<COMPILE_LANGUAGE:CXX>:-fno-exceptions -fno-rtti -funwind-tables -fno-asynchronous-unwind-tables>`
`202`	`202`	`)`
`203`	`203`	`elseif (MSVC)`
`204`	`204`	`target_compile_options(${tgtname} PRIVATE`