https://bugs.kde.org/show_bug.cgi?id=463027
Bug ID: 463027
Summary: broken check for MPX instruction support in assembler
Classification: Developer tools
Product: valgrind
Version: 3.21 GIT
Platform: Other
OS: Other
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: naes...@gmail.com
Target Milestone: ---
SUMMARY
There is a syntax error in the "if amd64 assembler knows the MPX instructions"
check.
The assembler never gets to see it.
STEPS TO REPRODUCE
1. On amd64, follow the build instructions from README, up through step 4
OBSERVED RESULT
The configure output includes the line:
checking if amd64 assembler knows the MPX instructions... no
EXPECTED RESULT
With a sufficiently-new assembler, it should instead be:
checking if amd64 assembler knows the MPX instructions... yes
SOFTWARE/OS VERSIONS
gcc (Debian 10.2.1-6) 10.2.1 20210110
GNU assembler (GNU Binutils for Debian) 2.35.2
ADDITIONAL INFORMATION
The relevant portion of config.log is:
configure:12750: checking if amd64 assembler knows the MPX instructions
configure:12773: gcc -c conftest.c >&5
conftest.c: In function 'main':
conftest.c:51:11: error: expected ':' or ')' before 'bnd'
51 | bnd jmp end\n"
| ^~~
conftest.c:51:23: error: stray '\' in program
51 | bnd jmp end\n"
| ^
conftest.c:51:25: warning: missing terminating " character
51 | bnd jmp end\n"
| ^
conftest.c:51:25: error: missing terminating " character
conftest.c:52:23: error: stray '\' in program
52 | foo: bnd ret\n"
| ^
conftest.c:52:25: warning: missing terminating " character
52 | foo: bnd ret\n"
| ^
conftest.c:52:25: error: missing terminating " character
conftest.c:53:19: warning: missing terminating " character
53 | end: nop");
| ^
conftest.c:53:19: error: missing terminating " character
53 | end: nop");
| ^~~
configure:12773: $? = 1
However, it's actually just missing some starting " characters.
See attached patch. The test even passes!
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