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autoconf-2.72 breaks macOS configure

autoconf 2.72 was released fri, 22 dec 2023 1. brew reports 2.72 as the current version of autoconf 2.

using autoconf-2.72, azure with image "macOS-latest" (Big Sur 3) AC_PROG_CXX on azure/macOS appears to set CXX to /usr/bin/g++ -std=gnu++11.

in 'm4/fp_find_cxx_lib.m4' the code "$CXX" -E actest.cpp -o actest.out results in error no such file or directory: /usr/bin/g++ -std=gnu++11. if we instead write eval "$CXX" -E actest.cpp -o actest.out it works the way we want.

  1. https://lists.gnu.org/archive/html/info-gnu/2023-12/msg00002.html ↩

  2. https://formulae.brew.sh/formula/autoconf ↩

  3. https://learn.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops&tabs=yaml#software ↩

Edited by Shayne Fletcher
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