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FindBLAS: Fix MKL Fortran API selection

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Fixes: #28071
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Ye Luo authored and Brad King committed 2026-09-07 10:35:54 -04:00
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commit 7fc5446d66
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Modules/FindBLAS.cmake
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@@ -502,7 +502,9 @@ if(BLA_VENDOR MATCHES "Intel" OR BLA_VENDOR STREQUAL "All")
set(BLAS_mkl_END_GROUP "")
endif()
# Switch to GNU Fortran ABI regarding how functions return complex numbers and how characters are passed (but not on Apple, where MKL does not provide it).
if(CMAKE_Fortran_COMPILER_LOADED AND (CMAKE_Fortran_COMPILER_ID STREQUAL "GNU" OR CMAKE_Fortran_COMPILER_ID STREQUAL "LCC") AND NOT APPLE)
# GNU and LLVMFlang families of compilers follow modern C99 _Complex ABI convention.
# Intel, IntelLLVM, NVHPC follows the legacy convention.
if(CMAKE_Fortran_COMPILER_LOADED AND NOT (CMAKE_Fortran_COMPILER_ID MATCHES "^Intel" OR CMAKE_Fortran_COMPILER_ID STREQUAL "NVHPC") AND NOT APPLE)
set(BLAS_mkl_INTFACE "gf")
else()
set(BLAS_mkl_INTFACE "intel")