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Cannot install gcc48 with homebrew

I can not install gcc48 with homebrew. Installation failed with (starting from the last lines in the output settings):

checking for version 0.10 of ISL... no checking for version 0.11 of ISL... no configure: error: Unable to find a usable ISL. See config.log for details. ==> Formula Tap: homebrew/versions Path: /usr/local/Library/Taps/homebrew-versions/gcc48.rb ==> Configuration HOMEBREW_VERSION: 0.9.4 HEAD: e2b10438666f41366f596fe762b2455f5761bcd8 CPU: 8-core 64-bit sandybridge OS X: 10.8.4-x86_64 Xcode: 4.6.3 CLT: 4.6.0.0.1.1365549073 X11: 2.7.4 => /opt/X11 ==> ENV HOMEBREW_CC: clang MAKEFLAGS: -j1 CMAKE_PREFIX_PATH: /usr/local CMAKE_INCLUDE_PATH: /opt/X11/include/freetype2:/usr/include/libxml2:/opt/X11/include CMAKE_LIBRARY_PATH: /opt/X11/lib PKG_CONFIG_PATH: /usr/local/opt/isl/lib/pkgconfig:/usr/local/opt/cloog/lib/pkgconfig PKG_CONFIG_LIBDIR: /usr/lib/pkgconfig:/usr/local/Library/ENV/pkgconfig/10.8:/opt/X11/lib/pkgconfig:/opt/X11/share/pkgconfig HOMEBREW_MAKE_JOBS: 1 ACLOCAL_PATH: /usr/local/share/aclocal:/opt/X11/share/aclocal OBJC: cc PATH: /usr/local/Library/ENV/4.3:/usr/local/opt/cloog/bin:/opt/X11/bin:/usr/bin:/bin:/usr/sbin:/sbin Error: gcc48 did not build

I have isl installed.

 : brew info isl isl: stable 0.12, HEAD http://www.kotnet.org/~skimo/isl/ /usr/local/Cellar/isl/0.12 (55 files, 3.2M) * Built from source From: https://github.com/mxcl/homebrew/commits/master/Library/Formula/isl.rb ==> Dependencies Required: gmp
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2 answers

GCC imposed strict requirements on the ISL version. While for the 4.8 branch, and for the external line (4.9), ISL 0.10 or 0.11 is required. Homebrew temporarily returned ISL to 0.11.2, so now everything should be fine.

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This is not limited to Homebrew. There is a script configuration problem if cloog-0.18.0 uses the related subpacket isl-0.11.1. The VERSION string is incorrectly replaced and set to "UNKNOWN" in the isl_version() function call, the value that the gcc configure script tests.

You may need to create (or install) ISL first, and then add --with-isl-prefix=$SOME_DIR to cloog settings, so it uses an external ISL installation. I recently created gcc-4.8.1 for AVR from the source and used:

 ## isl-0.11.1 @ ftp://gcc.gnu.org/pub/gcc/infrastructure/ > ../configure --prefix=$CROSSDIR --with-gmp-prefix=$CROSSDIR > make [check]; make install; rehash and now build cloog-0.18.0 with the installed 'system' ISL: > ../configure --prefix=$CROSSDIR --with-isl-prefix=$CROSSDIR \ --with-gmp-prefix=$CROSSDIR > make [check]; make install; rehash

This also required the addition of: --with-isl=$CROSSDIR to the gcc configuration options.

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Source: https://habr.com/ru/post/948168/

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