[flang-rt] Set HAVE_LDBL_MANT_DIG_113. #130836
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This check enables flang_rt.quadmath build on aarch64.
klausler
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Mar 11, 2025
Bertik23
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Mar 12, 2025
This check enables flang_rt.quadmath build on aarch64.
vzakhari
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Mar 12, 2025
I thought I guessed a fix in llvm#130836, but I was wrong. We actually had the same code in `flang/cmake/modules/FlangCommon.cmake`. The check does not pass in flang-rt bootstrap build, because `-nostdinc++` is added for all `runtimes` checks. I decided to make the check with the C header, though, I am still unsure whether it is reliable with a clang that has not been installed (it is taken from the build structure during flang-rt configure step). I verified that this PR enables REAL(16) math entries on aarch64.
vzakhari
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Mar 12, 2025
I thought I guessed a fix in #130836, but I was wrong. We actually had the same code in `flang/cmake/modules/FlangCommon.cmake`. The check does not pass in flang-rt bootstrap build, because `-nostdinc++` is added for all `runtimes` checks. I decided to make the check with the C header, though, I am still unsure whether it is reliable with a clang that has not been installed (it is taken from the build structure during flang-rt configure step). I verified that this PR enables REAL(16) math entries on aarch64.
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This check enables flang_rt.quadmath build on aarch64.