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Reproduction Steps:

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emerge rxvt-unicode fails emake

prefixing
CXXFLAGS="-std=c++14"
to emerge achieves a successful emake

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emerge rxvt-unicode fails emake prefixing CXXFLAGS="-std=c++14" to emerge achieves a successful emake

Impact:
Blocks rxvt-unicode
Presumptive Root Cause:
The source code is incompatible with C++17, which is the default dialect in GCC-11.

Attempting to build rxvt-unicode-9.22-r3 on current Next, and emake fails.

./../libev/ev+.h:379:46: error: ISO C++17 does not allow dynamic exception specifications

379 | default_loop (unsigned int flags = AUTO) throw (bad loop)

An internet search led me to:

As stated:

"solution was to add

CXXFLAGS="-std=c++14"

to the top of the build() function in PKGBUILD"

This led me to re-try emerging rxvt-unicode with:

CXXFLAGS="-std=c++14" emerge -av rxvt-unicode

to a successful build, and expected operation when running the terminal.

See, also: