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[LLD][ELF] Fix compressed-debug-level test on SystemZ

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The libz compression library on SystemZ by default makes use of the
platform's hardware-accelerated compression facility. This is much
faster than the regular software implementation, but often results in
slightly different outputs. This causes failures with the
compressed-debug-level test case.

To fix this, run this test while setting the DFLTCC environment
variable to zero, which prevents use of hardware compression and falls
back to the software implementation. (This should not have any effect
on other platforms.)

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D149273
This commit is contained in:
Ulrich Weigand 2023-04-27 17:49:32 +02:00
parent fb8557813a
commit f2404d589e
1 changed files with 8 additions and 4 deletions
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12
lld/test/ELF/compressed-debug-level.test
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@ -2,18 +2,22 @@
# RUN: yaml2obj %s -o %t.o
# RUN: ld.lld %t.o -o %t.default --compress-debug-sections=zlib
## The environment variable DFLTCC=0 disables use of the hardware compression
## facility on SystemZ. When this facility is enabled, slightly different
## compression results can be seen, which would throw off the tests below.
# RUN: DFLTCC=0 ld.lld %t.o -o %t.default --compress-debug-sections=zlib
# RUN: llvm-readelf --sections %t.default | FileCheck -check-prefixes=HEADER,LEVEL1 %s
# RUN: ld.lld -O0 %t.o -o %t.O0 --compress-debug-sections=zlib
# RUN: DFLTCC=0 ld.lld -O0 %t.o -o %t.O0 --compress-debug-sections=zlib
# RUN: llvm-readelf --sections %t.O0 | FileCheck -check-prefixes=HEADER,LEVEL1 %s
# RUN: cmp %t.default %t.O0
# RUN: ld.lld -O1 %t.o -o %t.O1 --compress-debug-sections=zlib
# RUN: DFLTCC=0 ld.lld -O1 %t.o -o %t.O1 --compress-debug-sections=zlib
# RUN: llvm-readelf --sections %t.O1 | FileCheck -check-prefixes=HEADER,LEVEL1 %s
# RUN: cmp %t.default %t.O1
# RUN: ld.lld -O2 %t.o -o %t.O2 --compress-debug-sections=zlib
# RUN: DFLTCC=0 ld.lld -O2 %t.o -o %t.O2 --compress-debug-sections=zlib
# RUN: llvm-readelf --sections %t.O2 | FileCheck -check-prefixes=HEADER,LEVEL6 %s
## LLD uses zlib compression of level 1 when -O0, -O1 and level 6 when -O2.