[llvm-bugs] [Bug 24979] New: llvm-config does not take target compiler into account

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24979

            Bug ID: 24979
           Summary: llvm-config does not take target compiler into account
           Product: tools
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llvm-config
          Assignee: unassignedbugs at nondot.org
          Reporter: simonas+llvm.org at kazlauskas.me
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

llvm-config emits flags for the compiler it was built with, rather than the
compiler the flags will be used with.

On my system `llvm-config --cxxflags` emits following flags for g++:

`-I/usr/include -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong
--param=ssp-buffer-size=4  -fPIC -fvisibility-inlines-hidden -Wall -W
-Wno-unused-parameter -Wwrite-strings -Wcast-qual
-Wno-missing-field-initializers -pedantic -Wno-long-long
-Wno-maybe-uninitialized -Wnon-virtual-dtor -Wno-comment -std=c++11
-ffunction-sections -fdata-sections -O3 -DNDEBUG  -fno-exceptions 
-D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
-D__STDC_LIMIT_MACROS`

Which appended to

`clang++ -Werror`

cause a compilation…

`error: unknown warning option '-Wno-maybe-uninitialized'; did you mean
'-Wno-uninitialized'? [-Werror,-Wunknown-warning-option]`

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