[clang] [flang] [clang][driver] Special care for -l flags in config files (PR #117573)

[Paul Osmialowski via cfe-commits]

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@@ -61,3 +61,22 @@
 ! CHECK-TWO-CONFIGS-NEXT: Configuration file: {{.*}}Inputs{{.}}config2{{.}}config-4.cfg
 ! CHECK-TWO-CONFIGS: -ffp-contract=fast
 ! CHECK-TWO-CONFIGS: -O3
+
+!--- The -l flags should be moved to the end of input list and appear only when linking.
+! RUN: %flang --config %S/Inputs/config-l.cfg -o %s.out %s -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING
+! RUN: %flang --config %S/Inputs/config-l-openmp.cfg -o %s.out %s -### 2>&1 | FileCheck %s -check-prefix CHECK-LINKING-LIBOMP-GOES-LAST
+! RUN: %flang --config %S/Inputs/config-l.cfg -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING
+! RUN: %flang --config %S/Inputs/config-l-openmp.cfg -S %s -### 2>&1 | FileCheck %s -check-prefix CHECK-NOLINKING
+! CHECK-LINKING: Configuration file: {{.*}}Inputs{{.}}config-l.cfg
+! CHECK-LINKING: "-ffast-math"
+! CHECK-LINKING: "/tmp/{{.*}}-{{.*}}.o" "-lm" "-lhappy"
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pawosm-arm wrote:

yeah, full path isn't really needed there, a good regexp can solve this.

Also I've added `--target=aarch64-unknown-linux-gnu` to all, to simplify the test cases.

https://github.com/llvm/llvm-project/pull/117573