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Unbalanced AC_LANG_PUSH / POP with ax_check_x86_features / ax_gcc_x86_cp

From: Kip Warner
Subject: Unbalanced AC_LANG_PUSH / POP with ax_check_x86_features / ax_gcc_x86_cpu_supports
Date: Fri, 18 Aug 2017 19:11:08 -0700

Hey list,

My sets AC_LANG([C++]). I conduct a variety of tests, both
before and after running AX_CHECK_X86_FEATURES. 

I noticed, however, that after inserting this latter test the
subsequent ones which depend on a C++ compiler fail, such as

I did a little bit of digging and it appears as though there is a
temporary workaround by appending an AC_LANG([C++]) immediately after
executing AX_CHECK_X86_FEATURES. 

My guess is either AX_CHECK_X86_FEATURES or AX_GCC_X86_CPU_SUPPORTS may
have unbalanced AC_LANG_PUSH / AC_LANG_POPs.

Yours truly,

Kip Warner | Senior Software Engineer
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