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From: Denis Washington <denis AT denisw DOT de>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: GCC / make escaping differences
Date: Fri, 13 Mar 2015 09:50:31 +0000
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Hello,

I tried to install the nokogiri Ruby gem today with a freshly installed Cygwin (and cygwin's ruby). Unfortunately, compilation of the native extension module fails with errors like:

    nokogiri.c:103:3: error: stray '\' in program
       rb_const_set(mNokogiri, rb_intern("NOKOGIRI_LIBXSLT_PATCHES"), rb_str_split(NOKOGIRI_STR_NEW2(NOKOGIRI_LIBXSLT_PATCHES), " "));

I suspected that this had something to do with the gcc command defined in the Makefile, which includes backslashes to escape quotes in -D values like this:

    -DNOKOGIRI_LIBXML2_PATH\=\"/home/.../2.9.2\"

But here is the strange thing: if I copy the exact command displayed by make and run it directly in bash, it works flawlessly! I am completely puzzled. Is this some difference in how make and bash are interpreting escape sequences? Seems like a bug to me. The versions of make and bash are the most current as of today, i.e. GNU make 4.1 and bash 4.3.33.

For reference, this is the complete command:

    gcc -I. -I/usr/include/ruby-2.0.0 -I/usr/include/ruby-2.0.0/ruby/backward -I/usr/include/ruby-2.0.0 -I. -DHAVE_XMLPARSEDOC -DHAVE_XSLTPARSESTYLESHEETDOC -DHAVE_EXSLTFUNCREGISTER -DHAVE_XMLHASFEATURE -DHAVE_XMLFIRSTELEMENTCHILD -DHAVE_XMLRELAXNGSETPARSERSTRUCTUREDERRORS -DHAVE_XMLRELAXNGSETPARSERSTRUCTUREDERRORS -DHAVE_XMLRELAXNGSETVALIDSTRUCTUREDERRORS -DHAVE_XMLSCHEMASETVALIDSTRUCTUREDERRORS -DHAVE_XMLSCHEMASETPARSERSTRUCTUREDERRORS -I/home/Denis/.gem/ruby/gems/nokogiri-1.6.6.2/ports/x86_64-unknown-cygwin/libxslt/1.1.28/include -I/home/Denis/.gem/ruby/gems/nokogiri-1.6.6.2/ports/x86_64-unknown-cygwin/libxml2/2.9.2/include/libxml2 -DLIBXML_STATIC -I/home/Denis/.gem/ruby/gems/nokogiri-1.6.6.2/ports/x86_64-unknown-cygwin/libxml2/2.9.2/include/libxml2 -DLIBXML_STATIC    -DNOKOGIRI_LIBXML2_PATH\=\"/home/Denis/.gem/ruby/gems/nokogiri-1.6.6.2/ports/x86_64-unknown-cygwin/libxml2/2.9.2\" -DNOKOGIRI_LIBXML2_PATCHES\=\"0001-Revert-Missing-initialization-for-the-catalog-module.patch\ 0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch\" -DNOKOGIRI_LIBXSLT_PATH\=\"/home/Denis/.gem/ruby/gems/nokogiri-1.6.6.2/ports/x86_64-unknown-cygwin/libxslt/1.1.28\" -DNOKOGIRI_LIBXSLT_PATCHES\=\"0001-Adding-doc-update-related-to-1.1.28.patch\ 0002-Fix-a-couple-of-places-where-f-printf-parameters-wer.patch\ 0003-Initialize-pseudo-random-number-generator-with-curre.patch\ 0004-EXSLT-function-str-replace-is-broken-as-is.patch\ 0006-Fix-str-padding-to-work-with-UTF-8-strings.patch\ 0007-Separate-function-for-predicate-matching-in-patterns.patch\ 0008-Fix-direct-pattern-matching.patch\ 0009-Fix-certain-patterns-with-predicates.patch\ 0010-Fix-handling-of-UTF-8-strings-in-EXSLT-crypto-module.patch\ 0013-Memory-leak-in-xsltCompileIdKeyPattern-error-path.patch\ 0014-Fix-for-bug-436589.patch\ 0015-Fix-mkdir-for-mingw.patch\"  -ggdb -O2 -pipe -Wimplicit-function-declaration    -g -DXP_UNIX -Wall -Wcast-qual -Wwrite-strings -Wconversion -Wmissing-noreturn -Winline -DNOKOGIRI_USE_PACKAGED_LIBRARIES  -o nokogiri.o -c nokogiri.c

Regards,
Denis Washington

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